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08- Stormwater Facility Plan
Bozeman Storm Water Facilities Plan May 2008 Prepared by: HDR Engineering, Inc. 1715 South Reserve St. Missoula, MT 59801 Morrison-Maierle 901 Technology Blvd. P. O. Box 1113 Bozeman, MT 59715 Table of Contents Table of Contents EXECUTIVE SUMMARY CHAPTER 1: EXISTING SYSTEM INVENTORY 1.1 Introduction...............................................................................................................................1-1 1.1.1 Overview.......................................................................................................................1-1 1.1.2 Study Area Description...............................................................................................1-2 1.1.3 Basis of System Inventory..........................................................................................1-2 1.2 Options for Map and Database Improvements...................................................................1-5 1.2.1 General..........................................................................................................................1-5 1.2.2 Improvements Using Existing Information............................................................1-5 1.2.3 Map Improvements Using Field Investigation........................................................1-7 1.3 Recommendations.....................................................................................................................1-7 CHAPTER 2: SYSTEM ANALYSIS 2.1. Introduction..................... ...........................................................................................................2.1 2.2. Hydrology...................................................................................................................................2-1 2.2.1. Rainfall Distribution....................................................................................................2-1 2.2.2. Storm Precipitation Depths.......................................................................................2-2 2.2.3. Comparison to SCS Storm Hyetograph...................................................................2-3 2.3. Hydrologic and Hydraulic Model Construction...................................................................2-4 2.3.1. Model Selection and Overview..................................................................................2-4 2.3.2. Modeling Approach.....................................................................................................2-4 2.3.3. Model Requirements...................................................................................................2-4 Hydrologic Information:...................................................................................................2-4 Hydraulic Information:......................................................................................................2-5 2.3.4. Overall Model Setup...................................................................................................2-8 2.3.5. Pilot Basin Setup..........................................................................................................2-8 2.4. SWMM Model Results............................................................................................................2-12 2.4.1. Runoff Volumes........................................................................................................2-12 Pre-Developed Conditions..............................................................................................2-12 i Bozeman Storm Water Facilities Plan Existing Conditions..........................................................................................................2-12 Future Conditions............................................................................................................2-13 2.4.2. Overall Model Output Summary.............................................................................2-13 Nodes (Results) Table......................................................................................................2-14 Links (Results) Table........................................................................................................2-14 2.4.3. Graphical Encoding..................................................................................................2-14 2.5. Hydrologic Model Verification.............................................................................................2-16 2.5.1. Comparison to Peak Stream Flows.........................................................................2-16 2.5.2. Flow Monitoring........................................................................................................2-16 2.6. Retention and Detention........................................................................................................2-17 2.6.1. Retention Volume Comparisons.............................................................................2-18 2.6.2. Regional Runoff Control..........................................................................................2-19 2.7. Existing Storm Water System Deficiencies.........................................................................2-19 CHAPTER 3: POLICY EVALUATION 3.1 Introduction..............................................................................................................................3-1 3.2 Existing Storm Water Policy Summary..................................................................................3-1 3.3 Regional Approaches towards Storm Water Management and Mitigation......................3-1 3.3.1 Hydrologic Considerations.........................................................................................3-2 3.3.2 Financial and Political Considerations......................................................................3-2 3.4 Case Studies: Evaluating Regional Storm Water Management Policies...........................3-3 3.5 Storm Water Policy Considerations........................................................................................3-5 3.5.1 Flood Control...................................................................................................................3-5 3.5.2 Channel Stability/Regional Detention......................................................................3-6 3.5.3 Water Quality...............................................................................................................3-6 3.5.4 Hydrologic and Hydraulic Analysis Methods..........................................................3-7 3.5.5 Design Policy and Submittal Requirements.............................................................3-7 3.5.6 Construction and Operation and Maintenance Responsibilities..........................3-8 3.5.7 Storm Water Policy Considerations - Summary......................................................3-8 3.6 Storm Water Policy Recommendations...............................................................................3-14 3.6.1 Existing Storm Water Policy Summary..................................................................3-14 3.6.2 Storm Water Policy Recommendations.................................................................3-14 ii Table of Contents CHAPTER 4: NATIONAL POLLUTANT DISCHARGE ELINIMATION SYSTEM PHASE 2 PERMIT COMPLIANCE 4.1 Introduction......................................................................................................................................4-1 4.2 Water Quality Issues........................................................................................................................4-1 4.2.1. Water Quality......................................................................................................................4-2 4.2.2. Possible Pollutant Sources.................................................................................................4-3 4.3 NPDES Permit Application...........................................................................................................4-4 4.3.1. Minimum Control Measures.............................................................................................4-4 4.3.2. Minimum Control Measure 1 – Public Education and Outreach on Storm Water Impacts.................................................................................................................................4-5 4.3.3. Minimum Control Measure 2 – Public Participation and Involvement.....................4-9 4.3.4. Minimum Control Measure 3 – Illicit Discharge Detection and Elimination.........4-12 4.3.5. Minimum Control Measure 4 – Construction Site Storm Water Runoff Control..4-18 4.3.6. Minimum Control Measure 5 – Post-Construction Storm Water Management.....4-21 4.3.7. Minimum Control Measure 6 – Pollution Prevention and Good Housekeeping for Municipal Operation..................................................................................................4-25 4.4 Reporting Requirements................................................................................................................4-28 4.4.1. Sampling.............................................................................................................................4-28 4.5 Co-Permitting ...............................................................................................................................4-30 4.5.1. Montana State University................................................................................................4-31 4.5.2. Montana Department of Transportation......................................................................4-32 4.5.3. Gallatin Local Water Quality District............................................................................4-32 4.6 Summary..........................................................................................................................................4-33 CHAPTER 5: FINANCIAL MANAGEMENT EVALUATION 5.1 Introduction...............................................................................................................................5-1 5.1.1 Current Storm Water Program Elements and Costs.............................................5-1 5.1.2 Summary of Current Costs.........................................................................................5-3 5.1.3 Historic Funding Sources...........................................................................................5-5 5.2 Estimated Future Storm Water Costs....................................................................................5-5 5.3 Overview of Funding Options................................................................................................5-6 5.4 Financial Program Recommendations.................................................................................5-11 5.4.1 Recommended Storm Water Charge Rate Methodology....................................5-12 5.4.2 Criteria for Rate Structure Selection.......................................................................5-12 iii Bozeman Storm Water Facilities Plan 5.5 Government Accounting Standards Board Statement No. 34 (GASB 34)....................5-13 CHAPTER 6: RECOMMENDED PLAN 6.1. Introduction...............................................................................................................................6-1 6.2 Regional versus Development Based Storm Water Management......................................6-1 6.2.1. Development-Based Approach.................................................................................6-1 6.2.2. Regional Approach......................................................................................................6-1 6.2.3 Recommended Approach...........................................................................................6-2 6.3. Storm Water Utility Implementation......................................................................................6-2 6.4 Storm Water Design Policy......................................................................................................6-3 6.5 Proposed Capital Facilities Solutions for Areas of Known Flooding...............................6-4 6.5.1. Farmers Canal..............................................................................................................6-4 6.5.2 20th Avenue.................................................................................................................6-5 6.5.3 Wagon Wheel Ditch....................................................................................................6-5 6.5.4 Valley Unit Park...........................................................................................................6-5 6.5.5 Willson - Cleveland and Willson - Garfield.............................................................6-6 6.5.6 Resort Drive.................................................................................................................6-6 6.5.7 North 11th Avenue.....................................................................................................6-6 6.5.8 I-90/East Main Interchange......................................................................................6-6 6.5.9 Rouse Avenue..............................................................................................................6-6 6.5.10 Auction and Feedlot....................................................................................................6-7 6.5.11 General Rehabilitation and Replacement.................................................................6-7 6.6. Other Problem Areas................................................................................................................6-7 6.6.1 Rocky Creek.................................................................................................................6-7 6.6.2 Bozeman Creek Freezing............................................................................................6-8 6.6.3 Bozeman Creek Water Quality..................................................................................6-8 6.7 Recommended Plan for Operation and Maintenance.........................................................6-9 6.7.1 Condition Assessment: Implementing a Rating System........................................6-9 6.7.2 Operation and Maintenance.....................................................................................6-10 6.8 Other Recommendations.......................................................................................................6-18 iv Table of Contents List of Tables Table 2.2-1 Occurrence of Storms By Duration...............................................................................2-1 Table 2.2-2 Storm Depths for 2, 10, 25, 50, and 100 Year Recurrence Intervals..........................2-3 Table 2.4-1 Runoff for Development Scenarios..............................................................................2-13 Table 2.5-1 Recommended Flow Monitoring Points......................................................................2-16 Table 2.6-1 Retention Volume Comparisons...................................................................................2-18 Table 2.6-2 Area Required for Regional Retention Facilities.........................................................2-19 Table 2.7-1 Areas of Known Flooding..............................................................................................2-20 Table 3.4-1 Summary of Storm Water Policies in the Region..........................................................3-3 Table 3.5-1 Storm Water Policy Considerations................................................................................3-9 Table 3.6-1. Runoff Coefficients ( C ) for Use in the Rational Formula......................................3-19 Table 4.2-1 Water Quality Information...............................................................................................4-2 Table 4.2-2 Primary Pollutants of Concern in Urban Runoff..........................................................4-4 Table 4.3-2 Public Outreach Activities and Targeted Audiences....................................................4-6 Table 4.3-3 Minimum Control Measure No. 1 – Public Outreach and Education.......................4-9 Table 4.3-4 Minimum Control Measure No. 2 - Public Participation and Involvement...........4-11 Table 4.3-5 Example Disposal Options for Non-Storm Discharges............................................4-14 Table 4.3-6 Minimum Control Measure No. 3 - Illicit Discharge Detection and Elimination.4-17 Table 4.3-7 Minimum Control Measure No. 4 - Construction Site Storm Water Runoff Control ...............................................................................................................................4-21 Table 4.3-8 Minimum Control Measure No. 5 - Post-Construction Storm Water Management ...............................................................................................................................4-24 Table 4.3-9 Minimum Control Measure No. 6 – Pollution Prevention and Good Housekeeping for Municipal Operation............................................................................................4-27 Table 4.4-1 Testing Parameters and Median Concentrations.........................................................4-29 Table 4.4-2 2005 Storm Water Quality Testing................................................................................4-29 Table 4.5-1 MSU Phase 2 Permit Activities......................................................................................4-31 Table 4.5-2 GLWQD Phase 2 Permit Activities..............................................................................4-32 Table 4.6-1 Total Annual Cost for Permit Process..........................................................................4-33 Table 5.1-1 Financial Summary for Storm Water Management.......................................................5-4 Table 5.2-1 Estimated Future Storm Costs.........................................................................................5-6 Table 5.3-1 Comparison of Storm Water Funding Alternatives....................................................5-10 v Bozeman Storm Water Facilities Plan Table 6.5-1 Summary of Recommendations.......................................................................................6-4 Table 6.7-1 Recommended Maintenance Frequency.......................................................................6-11 Table 6.7-2 Typical Maintenance Activities for Dry Ponds............................................................6-12 Table 6.7-3 Operation and Maintenance Program Summary.........................................................6-17 List of Figures Figure 1.1-1. Study Area.........................................................................................................................1-3 Figure 1.1-2. Grid Map Index...............................................................................................................1-4 Figure 1.3 1. Storm Drain System - Field Notes................................................................................1-9 Figure 2.2-1 2-hr and 6 hr Storm Unit Hyetograph, Cumulative Depth = 1 in............................2-2 Figure 2.2-2 24-hr Storm Unit Hyetograph, Cumulative Depth = 1 in..........................................2-2 Figure 2.2-3 Comparison of USGS and SCS Hyetograph Methods...............................................2-3 Figure 2.3-1 Existing Land Use (2004)................................................................................................2-6 Figure 2.3-2 2020 Future Land Use......................................................................................................2-7 Figure 2.3-3 City of Bozeman Regional Drainage Network...........................................................2-10 Figure 2.3-4 Pilot Basin Drainage Network......................................................................................2-11 Figure 2.4-1 Graphical Encoding.......................................................................................................2-15 Figure 2.7-1 Areas of Known Flooding.............................................................................................2-23 Figure 5.1-1 Storm Water Related Costs.............................................................................................5-4 vi Table of Contents vii List of Appendices Appendix A: Existing System Inventory Data Appendix A-1: Junction Spreadsheet Appendix A-2: Link Spreadsheet Appendix B: Storm Water System Analysis Data Appendix C: XP Tables Appendix C-1: Nodes, Input Data Appendix C-2: Nodes, Output Data Appendix C-3: Links, Input Data Appendix C-4: Links, Output Data Appendix D: Storm Water Policy Appendix D-1: Low Impact Development Appendix D-2: Storm Water Best Management Practices Appendix E: Infrastructure Rating System Alternatives Appendix F: NPDES Materials Appendix G: Storm Water Design Report – Submittal Guidelines Appendix H: Financial Methodologies Appendix I: Storm Drain Map Appendix J: Screening Guidance Appendix K: Kalispell Storm Water Management Permit Final Bozeman Storm Water Facilities Plan Edits Summary (September 17-18, 2007) • Title Page o No changes made • Table of Contents o Updated based on final Chapters and Appendices • Executive Summary o Edited per M. Hickman’s final edits. • Chapter 1 o Edited per M. Hickman’s final edits. • Chapter 2 o Edited text per M. Hickman’s final edits. o Edited figure numbers per M. Hickman’s final edits. o Left figures as full size. • Chapter 3 o Edited text per M. Hickman’s final edits. • Chapter 4 o Mike did not review this section • Chapter 5 o Edited text per M. Hickman’s final edits, with the exception of minor grammatical adjustments (5.1.3), and two references to text changes that remained unchanged (i.e. City does NOT conduct site inspections on new development; money for storm water-related activities does NOT come from the City’s General Fund) o Also adjusted numbering of Sections to begin with 5.1 rather than 5.0 • Chapter 6 o Edited text per M. Hickman’s final edits and A. McInnis’s responses. • Appendix A o Edited text per M. Hickman’s final edits, with the exception of bolding the secondary heading in Table 4 (Shape Files) rather than providing a double line. • Appendix B o Deleted last section (B.3.3 Model Requirements) per M. Hickman’s final edits. • Appendix C o Revised Cover Page to include titles for Appendices C-1 – C-4 per M. Hickman’s final edits. • Appendix D o No changes made. • Appendix E o No changes made. • Appendix F o No changes made. • Appendix G o Left formatting as is; did not remove G.1, etc. on headings as this is how the other appendices are formatted. • Appendix H o No changes made. • Appendix I o No changes made. • Appendix J o No changes made. • Appendix K o No changes made. Executive Summary Executive Summary Bozeman has been experiencing rapid growth and development and is faced with a new federal storm water permit requirement (the Phase 2 rule). In response to these issues, the City prepared this Storm Water Facilities Plan. The most significant recommendations coming out of this plan are: • Moving forward with establishing a funding source for storm water • Guidance for development of a uniform approach to development submittals • Continuing to rely upon development-based storm water management until the Phase 2 program and creation of a utility are more advanced The goals of this plan, along with work completed, are summarized below. Goal 1 – Inventory the Existing System An inventory of the existing storm water system was completed by compiling storm water information from grid maps, plat maps, subdivision drawings, and field work. This inventory was converted to the City’s GIS system. This system inventory is discussed in Chapter 1 (Existing System Inventory) and Appendix A (Existing System Inventory Data). Goal 2 – Plan for Future Growth Growth trends and projected future land use were evaluated to determine potential future storm water impacts. In addition, a review of City policy was conducted to allow the City to handle that growth most effectively. This evaluation is presented in Chapter 3 (Policy Evaluation). In addition, ten best management practices are presented in Appendix D-2. Goal 3 – Evaluate Existing Problem Areas Problem areas, deficiencies, and areas of known flooding within the existing storm water system were identified and evaluated. Several storm water projects are recommended to address these deficiencies. The deficiencies are discussed in Chapter 2 (System Analysis), and recommendations are provided in Chapter 6 (Recommended Plan). Goal 4 – Storm Water System Analysis A model was completed for the pre-developed, existing, and future 2020 conditions scenarios for the entire City. A small portion of the overall model was designated as the pilot basin and studied in greater detail. In this area, detailed storm water infrastructure data was gathered by GPS and used in the model. The purpose of this pilot basin model was to provide the City with a model to build on. Modeling information is presented in Chapter 2 (System Analysis). Goal 5 – NPDES Permit Application and Implementation The City of Bozeman was required in 2003 to apply for a permit (from Montana Department of Environmental Quality) to discharge storm water into surface water 1 Bozeman Storm Water Facilities Plan around the City. The permit application requires the City to implement a Storm Water Management Program, including six minimum control measures that are described in Chapter 4 (National Pollutant Discharge Elimination System Phase 2 Permit Compliance). The current estimated cost of the program is about $100,000 per year, however, the program is in its infancy and its likely more significant operational and capital cost will come as the program matures. Goal 6 – Financial Plan A financial plan was completed for the City’s storm water system. The City does not currently have a dedicated source of revenue to fund storm water related work. Chapter 5 (Financial Management Evaluation) provides an overview of various funding alternatives and recommends the City form a utility. Chapter 5 also discusses the Government Accounting Standards Board (GASB) requirements, current storm water expenditures, and potential future needs. Goal 7 – Recommended Plan Recommended changes to current City of Bozeman design studies and development practices are presented in Chapter 6 (Recommended Plan), along with a proposed storm water design review form (see Appendix G), checklist, and revised submittal procedures. 2 Executive Summary 3 The near term infrastructure and policy recommendations presented in Chapter 6 are summarized in Table 1. Table 1. Policy and Infrastructure Recommendations Project Benefit Additional Information Cost Policy Recommendations Create a Storm Water Funding Mechanism Identify a funding mechanism for exemptions, fee basis, database needs, and organization Page 6-1 $60,000 Phase 2 Implementation Permit Activities Permit compliance Page 4-13 to 4-49 Current - $100,000 Future - $200,000- $400,000 Infrastructure Recommendations Farmer’s Canal Improvements at Farmer’s Canal will reduce flooding along Farmer’s Canal, 20th Avenue, and Wagon Wheel Ditch Pages 6-4 and 6-5 $50,000 to $100,000 Valley Unit Park Improvements to the detention pond outlet will reduce flooding along Meagher Avenue and Durston Road Page 6-5 $50,000 to $80,000 Resort Drive Review storm water plan and perform a site visit Page 6-5 $1,000 to $5,000 General Rehabilitation and Replacement Required for safe and effective management of existing storm water infrastructure Page 6-7 $200,000/year Rocky Creek Increase and restore native vegetation cover and diversity, thereby reducing sedimentation and improving water quality Page 6-7 $10,000 - $20,000 Bozeman Creek Freezing Reduce flooding, improved staff safety Pages 6-7 and 6-8 $50,000 Bozeman Creek Water Quality Effectively prepare for future development, improve water quality and increase fish passage Page 6-8 and 6-9 $50,000 (for initial study) Bozeman Storm Water Facilities Plan Chapter 1. Existing System Inventory Chapter 1: Existing System Inventory 1-i Table of Contents 1.1 Introduction ........................................................................................................................1-1 1.1.1 Overview.........................................................................................................................1-1 1.1.2 Study Area Description.................................................................................................1-2 1.1.3 Basis of System Inventory ............................................................................................1-2 1.2 Options for Map and Database Improvements.............................................................1-5 1.2.1 General ............................................................................................................................1-5 1.2.2 Improvements Using Existing Information...............................................................1-5 1.2.3 Map Improvements Using Field Investigation..........................................................1-7 1.3 Recommendations..............................................................................................................1-7 Figures Figure 1.1-1 Study Area...................................................................................................................1-3 Figure 1.1-2 Grid Map Index .........................................................................................................1-4 Figure 1.3-1 Storm Drain System - Field Notes..........................................................................1-9 Chapter 1: Existing System Inventory 1.1 Introduction The storm drain system inventory is a compilation of existing data in the form of an Excel spreadsheet database convertible to the City’s GIS program, Arcview. The data is also presented graphically on a new storm drain map of the study area. The study area encompasses the entire grid area covered by the index sheet of the City’s existing storm drain grid maps, referred to as grid maps throughout this document. Structures surveyed by the City using GPS equipment have been linked together in Arcview based primarily on the grid maps, but also using miscellaneous subdivision drawings, SID drawings and other sources that were provided by the City for this study. Some of the information in this chapter is also presented in Appendix A (Existing System Inventory Data), which provides a more detailed description of database development and recommendations. A highlighted set of grid maps, a product of this report, will be important to future mapping improvements. The maps have been highlighted to identify information that needs to be transferred to the new database before the grid maps can be retired as obsolete drawings. Once the grid maps have been fully replaced, many other types of improvements can be made to the new storm drain map and database. This would include incorporating the many subdivision and SID drawings that were not provided for this study and locating existing culverts and open channels using aerial photography. Final recommendations are presented as a phased approach to improving the map and database. As a minimum, it would be desirable to bring the new storm drain map and database to a point of completeness. The steps required to meet this minimum goal are presented, as are the next logical steps that could be completed to further improve the database. As funding becomes available, additional efforts, including field investigations and surveying of some or all of the study area, will continue to improve the completeness and reliability of the database. The Excel spreadsheet database has been designed to accept data input and also track the level of accuracy associated with virtually any piece of data for any of the connecting structures (junctions) or conveyance structures (links). The junction spreadsheet includes formulas that make use of the most reliable data to calculate pipe inverts. As data entry progresses, the improvements to accuracy and completeness will be evident for each junction. The new storm drain map and GIS database will become an important tool for overall management of the City’s storm water system. 1.1.1 Overview The City of Bozeman is served by a storm drainage system made up of piped storm drain networks connected by open channels. Currently, the single most complete source of locations and sizes of storm drainage facilities is the City’s grid maps. Storm drainage facilities also appear on plat maps, on a 1980 drainage inventory/mapping project, and on record drawings from subdivisions, Special Improvement Districts (SIDs) and other construction projects. The City has recently set up a GIS-based system for compiling storm drainage data. Prior to this study, the GIS database contained approximate coordinates and grate/rim elevations of 2,387 drainage structures, primarily manholes and catch basins. The purpose of this storm 1-1 Bozeman Storm Water Facilities Plan 1-2 drain inventory is to gather existing information on the City’s GIS-identified and other existing drainage structures and to organize it into a GIS-accessible format that simplifies future data input. The information gathered in this task will help determine priorities for future data collection efforts and will become an important tool for overall management of the City’s storm water system. 1.1.2 Study Area Description The study area, identified on Figure 1.1-1 completely encompasses the City Limits and surrounding areas. Montana State University (MSU) property was excluded from the study area and will be covered in a separate document. Connection points to the City’s storm drain system are assumed to occur at the MSU property line. The Bozeman area generally drains from south to north, with a major exception being the influence of agricultural irrigation ditches. During the growing season, the irrigation ditches draw water from natural drainages and convey flows across sub-basins, with high runoff typically overflowing into the historic/natural drainages at the control structures. The effect and management of the irrigation ditches is not covered in this study. 1.1.3 Basis of System Inventory This storm drain system inventory compiles data from five existing sources: • The City’s existing set of storm drain grid maps; • Storm drain structures that have been located by City staff using GPS equipment; • Design drawings and record drawings from construction projects; • The City’s existing set of plat maps, showing hand-sketched storm drain structures; and • A 1980 storm drainage inventory/mapping project. At this time, the grid maps represent the City’s most complete and accurate picture of its storm drain system. Structures appearing on one of the other five data sources but not on the grid maps were hand-drawn in and highlighted on a clean set of grid maps. Structures on the grid maps whose locations are not currently in the City’s GIS database are also highlighted. A set of the highlighted grid maps has been included, under separate cover, to indicate the general locations of these facilities. Figure 1.1-2 identifies currently mapped areas. Detailed information about these sources is included in Appendix A (Existing System Inventory Data). Chapter 1: Existing System Inventory 1.2 Options for Map and Database Improvements 1.2.1 General Improvement of the storm drain map and GIS database will involve filling in missing data, including the data gaps, and improving on the accuracy of the current data. Based on the experience gained in comparing the different data sources of this study, it seems likely that there are errors on the grid maps and other data sources. Considerable improvement can be made to the new storm drain map by creating GIS points for each junction shown on the highlighted grid maps that is not already in Arcview. The mapping can be further improved by adding culverts and open ditches to Arcview using aerial photography. Continued efforts to improve the mapping using existing data sources will provide some benefit and will help to streamline and prioritize future field investigations. A complete review of all existing data sources, including those not used in this mapping effort, would be an efficient way to produce a reasonably complete and accurate storm drain map that can be used for planning purposes; however, significant drawing errors may remain. Performing a thorough field investigation is an effective way to reveal erroneous data and resolve discrepancies. Options for map and database improvements are categorized in this section as those using existing documentation only and those using field investigation and surveying. 1.2.2 Improvements Using Existing Information Storm Drain Map and GIS Database allow the City to: Implement and monitor maintenance Evaluate growth scenarios for capacity and location Create accurate maps of the system Supply developers, contractors and engineers with up-to-date information One approach to upgrading the new Storm Drain Map and GIS database is to fill in data gaps using existing information that was not used for this Facilities Plan. Additional information can be incorporated into the storm drain map and database by taking the following steps. The term “visually set GIS data points” means to locate new junctions visually on the computer screen in their approximate positions relative to street intersections and junctions previously located using GPS and create new data points for these junctions in Arcview. 1. Visually set GIS data points for all junctions identified on the Excel spreadsheets as having no GPS data and define as many new links as possible using the newly defined junctions. This will allow inclusion of GIS data collected by this study for junctions and links that were not defined by the City’s GPS survey. 2. Visually set GIS data points for all junctions shown on the highlighted Grid Maps, including junctions printed but not highlighted. Define as many new links as possible, including open channels, using the newly defined junctions. This will bring the new storm drain map and GIS database to a point where they can fully replace the grid maps. This step includes entry of all data shown on the grid maps. 1-5 Bozeman Storm Water Facilities Plan 3. Obtain and review complete copies of the partial copies of subdivision and SID drawings used in this study and enter additional data that was missed on the partial copies. This step will complete the review of the construction drawings used in this study. 4. Develop and implement database maintenance procedures to ensure that construction of new storm drain facilities and modification, abandonment or removal of existing facilities is verified and documented on the new storm drain map and GIS database. This will ensure that the new database does not become obsolete over time. 5. Obtain and review complete copies of all available subdivision and SID drawings, and all other construction drawings and record drawings in the study area, that were not used in this study. Visually set GIS data points for all junctions shown on the drawings, and define as many new links as possible using the newly defined junctions. Enter all available data for the new junctions and links. This will complete the review of existing construction drawings for locations of constructed storm drain facilities. 6. Overlay the 2004 ortho-rectified aerial photography on the storm drain map and use other aerial photos as required to extend the overlay to cover the entire study area. Visually set GIS data points as necessary to revise the alignment of open channels already shown on the map and add all other open channels visible on the photos. This will connect isolated culverts and storm drain networks together and may identify additional culverts or other storm drain facilities that were missed. 7. Review all existing record drawings to determine which drawings are based on the City of Bozeman vertical datum and note this with a new code (e.g., “RD+” rather than “RD”) under the “Estimated Year Built/Source” column on the junction spreadsheet and the link spreadsheet. This will identify junctions and links that have fairly accurate elevations and could therefore be considered a lower priority for future field verification of grate, rim and invert elevations. 8. Use the FEMA aerial photos to produce area-wide topographic mapping to a two-foot contour interval (elevation accuracy of about ± 1 foot), and overlay the contours on the storm drain map. The new topography can be used to estimate drainage patterns and basin divides for overland flow. The new topography could also be used to estimate open channel slopes and elevations, grate/rim elevations, and pipe inverts where “drop to invert” distances are known. Previous experience with field verification of documentation-based storm drain mapping efforts similar to the one described above indicates that drawing errors are not uncommon. For example, a single pipe linked to the wrong upstream junction would create an erroneous assumption of the upstream sub-basin for that pipe, and would make any hydrologic and hydraulic calculations inaccurate for that pipe and downstream areas. Some possible drawing errors are: • Pipe connections between junctions are sometimes assumed and added to drawings without verification. • Links (pipes and open channels) or junctions may have been replaced, abandoned or modified without updating the existing mapping. 1-6 Chapter 1: Existing System Inventory • Pipes may have been installed and connected to City storm drain without the City’s knowledge. • Pipe sizes and/or materials are sometimes estimated and added to drawings after looking down a manhole or through a catch basin grate in poor lighting conditions, or making other inaccurate estimates. • Existing junctions may be overlooked because they have been paved over, are inaccessible, or are not visible due to vegetation. Drawing errors can be especially common in older pipe systems. Revealing erroneous data requires a thorough inspection of all junctions, including pipe sizes, materials and condition. Despite the potential for errors, the documentation-based effort described in the above steps will result in a fairly complete storm drain map and database. This map would be very useful in planning and performing future field investigations. 1.2.3 Map Improvements Using Field Investigation The most thorough and accurate way to upgrade the storm drain map and GIS database would be to complete a detailed field inspection and survey of the entire storm drain system. An investigation of this magnitude could be done in phases using existing, documentation-based mapping as a guide in determining priority areas. The database of this Facilities Plan provides a format to identify data from field-investigated areas and differentiate it from other, less reliable data. A detailed field investigation would include two parts: 1) an inspection of all junctions and visible storm drain facilities; and 2) an accurate survey. Of these two, the inspection will provide the most dramatic improvement to the existing database. The use of a standard data sheet to document the field inspections will provide continuity as numerous small field investigations are completed over time by different people. Figure 1.3-1 Storm Drain System - Field Notes is an example of a standard data sheet that has been used successfully in previous studies. Details on performing the inspections and survey are described in Appendix A (Existing System Inventory Data). Depending on the accuracy of the existing, documentation-based mapping, the survey phase may be performed before or after the inspection phase. It may be feasible to conduct the inspection and surveying phases concurrently. 1.3 Recommendations The mapping and database provided in Appendix A is a compilation of the information made available for this Facilities Plan. Improvements can be made to the GIS database and storm drain map using the existing drawings and other documentation, by performing field investigations, or both. The following recommendations describe a phased approach to systematically developing and maintaining an accurate storm drain facilities map and GIS database. This approach seeks to complete the most beneficial tasks first. • Step 1: Develop Database Maintenance Procedures Develop and implement procedures to ensure that any new construction associated with the storm drain system is verified and added to the database and develop a 1-7 Bozeman Storm Water Facilities Plan standardized junction data sheet similar to Figure 1.3-1 for junction inspections. The new database maintenance procedures should require that database updates also include other new information, such as new data from drainage master plans or studies, outfall location surveys, and modification, abandonment or removal of existing storm drain facilities. • Step 2: Fully Incorporate the Grid Maps Use existing information, particularly the highlighted grid maps of this Facilities Plan, to bring the database to a level of completeness exceeding the existing grid maps, thus making the grid maps obsolete. • Step 3: Add Open Channels Use aerial photography to revise the alignment of open channels already in the database, and add to the database other open channels that are visible on the aerial photos. • Step 4: Update Poorly Mapped Areas of the Database Make document-based improvements to the map and database in areas where the mapping is substantially incomplete. These areas can be identified by comparing the new storm drain map to the 2004 aerial photos to locate recently developed areas. • Step 5: Incorporate Remaining Documentation-Based Data Complete the input of data from the City’s files for areas or subdivisions not completed in Step 4, and obtain topographic mapping based on the 2004 aerial photos. The step-by-step recommendations listed above are documentation-based improvements not requiring field investigation. At any time, the need for localized field investigations may arise due to other factors. For example, if a detailed study of a drainage outfall or sub-basin is performed, or a flooding problem needs to be resolved, field investigation and survey for those areas could be completed as part of the project and incorporated into the storm drain database. Another possibility is that NPDES permitting may create a need for a field investigation of outfalls. The database is set up to easily incorporate data from miscellaneous, small field investigations. A standardized junction data sheet similar to Figure 1.3-1 should be made available for all field investigations. Over time, a City-wide field investigation could eventually become a matter of filling in the gaps. 1-8 Chapter 1: Existing System Inventory Figure 1.3-1 Storm Drain System - Field Notes 1-9 Bozeman Storm Water Facilities Plan Chapter 2. System Analysis Chapter 2: System Analysis Table of Contents 2.1 Introduction ........................................................................................................................2-1 2.2 Hydrology............................................................................................................................2-1 2.2.1 Rainfall Distribution......................................................................................................2-1 2.2.2 Storm Precipitation Depths..........................................................................................2-2 2.2.3 Comparison to SCS Storm Hyetograph .....................................................................2-3 2.3 Hydrologic and Hydraulic Model Construction ............................................................2-4 2.3.1 Model Selection and Overview....................................................................................2-4 2.3.2 Modeling Approach.......................................................................................................2-4 2.3.3 Data Requirements ........................................................................................................2-4 Hydrologic Information:........................................................................................................2-4 Hydraulic Information:..........................................................................................................2-5 2.3.4 Overall Model Setup......................................................................................................2-8 2.3.5 Pilot Basin Setup ............................................................................................................2-8 2.4 SWMM Model Results.....................................................................................................2-12 2.4.1 Runoff Volumes...........................................................................................................2-12 Pre-Developed Conditions ..................................................................................................2-12 Existing Conditions ..............................................................................................................2-12 Future Conditions.................................................................................................................2-13 2.4.2 Overall Model Results Summary ...............................................................................2-13 Nodes (Output Data) Table ................................................................................................2-14 Links (Output Data) Table ..................................................................................................2-14 2.4.3 Graphical Encoding.....................................................................................................2-14 2.5 Hydrologic Model Verification.......................................................................................2-16 2.5.1 Comparison to Peak Stream Flows...........................................................................2-16 2.5.2 Flow Monitoring ..........................................................................................................2-16 2.6 Retention and Detention.................................................................................................2-18 2.6.1 Retention Volume Comparisons ...............................................................................2-18 2.6.2 Regional Runoff Control ............................................................................................2-19 2.7 Existing Storm Water System Deficiencies ..................................................................2-20 2-i Bozeman Storm Water Facilities Plan 2-ii Tables Table 2.2-1 Occurrence of Storms By Duration ........................................................................2-1 Table 2.2-2 Storm Depths for 2, 10, 25, 50, and 100 Year Recurrence Intervals...................2-3 Table 2.4-1 Runoff for Development Scenarios .......................................................................2-13 Table 2.5-1 Recommended Flow Monitoring Points ...............................................................2-17 Table 2.6-1 Retention Volume Comparisons ............................................................................2-19 Table 2.6-2 Area Required for Regional Retention Facilities ..................................................2-20 Table 2.7-1 Areas of Known Flooding .......................................................................................2-21 Figures Figure 2.2-1 2-hr and 6-hr Storm Unit Hyetograph, Cumulative Depth = 1 in.....................2-2 Figure 2.2-2 24-hr Storm Unit Hyetograph, Cumulative Depth = 1 in...................................2-2 Figure 2.2-3 Comparison of USGS and SCS Hyetograph Methods ........................................2-3 Figure 2.3-1 Existing Land Use (2004).........................................................................................2-6 Figure 2.3-2 2020 Future Land Use...............................................................................................2-7 Figure 2.3-3 City of Bozeman Regional Drainage Network....................................................2-10 Figure 2.3-4 Pilot Basin Drainage Network...............................................................................2-11 Figure 2.4-1 Graphical Encoding ................................................................................................2-15 Figure 2.7-1 Areas of Known Flooding......................................................................................2-24 Chapter 2: System Analysis 2.1 Introduction This chapter describes the creation and interpretation of a combined hydrologic and hydraulic storm water model of the City’s existing storm water system. The storm water model provides a tool for storm water management decisions, identifies and evaluates deficiencies in the existing system, and provides information for evaluating proposed system improvements and future expansion or reconfiguration that will be needed to accommodate growth. Policy recommendations, potential solutions to known system deficiencies, and identification of system improvement projects are described in Chapter 6 (Recommended Plan). 2.2 Hydrology 2.2.1 Rainfall Distribution One common practice in rainfall-runoff analysis is to develop a statistical “average” rainfall distribution to use in place of actual storm events. This distribution includes maximum rainfall intensities for the selected design frequency arranged in a sequence that is critical for producing peak runoff. For example, the Soil Conservation Service (SCS) includes statistical rainfall distributions in its TR-55 program; the SCS distributions are commonly used throughout the United States. The USGS, in cooperation with the Montana Department of Natural Resources and Conservation, conducted a study published in 1998 titled Characteristics of Extreme Storms in Montana and Methods for Constructing Synthetic Storm Hyetographs (USGS Report 98-4100). Through statistical analysis, the study developed methods for constructing region-specific design storm hyetographs (rainfall distributions). These methods were used to create design storm hyetographs for the City of Bozeman. The USGS categorized its database of storms within the state into 12 different types of storm patterns, each with three different storm durations (2 hr, 6 hr, and 24 hr). In addition, the State of Montana was divided into three different regions that typically had similar precipitation characteristics. In general, these regions included the region west of the Rocky Mountains (1), the eastern slope along the Rocky Mountain range (2), and the most eastern portions of the state (3). The City of Bozeman resides within Region 2, at the eastern base of the Rocky Mountain range. Table 2.2-1 (Occurrences of Storms by Duration) exhibits the distribution of storm durations. Table 2.2-1 Occurrence of Storms By Duration Duration 0 - 2 hours 2 - 6 hours 6 - 24 hours Occurrence 47% 26% 27% Month with Highest Percentage of Storms June June June 2-1 Bozeman Storm Water Facilities Plan Unit hyetographs for the Bozeman area are shown below as Figures 2.2-1 and 2.2-2. The most common type of storm pattern for 2-hour and 6-hour duration storms was a pattern that exhibited a short time to peak intensity with a gradual decline as shown in Figure 2.2-2. Unit hyetographs for the Bozeman area are shown below as Figures 2.2-1 and 2.2-2. 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.200.0 0 0.2 5 0 .5 0 0.7 5 1.00 1.2 5 1.50 1.75 2.0 0 2 .2 5 2 .5 0 2.75 3.0 0 3.2 5 3 .5 0 3.7 5 4.00 4.2 5 4.50 4.7 5 5.0 0 5 .2 5 5.5 0 5.75 Time (hrs) De p t h ( i n ) Figure 2.2-1 2-hr and 6-hr Storm Unit Hyetograph, Cumulative Depth = 1 in 0.000 0.025 0.050 0.075 0.100 0.125 0.150 0.175 0.200 0.225 04812162024283236404448525660646872 Time (hrs) De p t h ( i n ) Figure 2.2-2 24-hr Storm Unit Hyetograph, Cumulative Depth = 1 in 2.2.2 Storm Precipitation Depths The USGS Report 98-4100 Characteristics of Extreme Storms in Montana and Methods for Constructing Synthetic Storm Hyetographs was used to establish storm depths for the City of Bozeman for 2, 10, 25, 50, and 100 year recurrence intervals. The values used in the storm water model are tabulated below in Table 2.2-2 (Storm Depths for 2, 10, 25, 50, and 100 Year Recurrence Intervals). 2-2 Chapter 2: System Analysis 2-3 Table 2.2-2 Storm Depths for 2, 10, 25, 50, and 100 Year Recurrence Intervals Storm Depth (inches) Recurrence Interval (years) 2-hr 6-hr 24-hr 2 0.44 0.65 1.12 10 0.73 1.08 1.86 25 0.88 1.19 1.99 50 1.07 1.48 2.42 100 1.25 1.66 2.67 The key assumptions used in the development of Table 2.2-2 are a mean annual precipitation of 18 inches and coordinates for the City of Bozeman (-111.05 degrees latitude, 45.68 degrees longitude). 2.2.3 Comparison to SCS Storm Hyetograph This section presents a comparison of the USGS method to the widely used and accepted Soil Conservation Service (SCS) method, which is published as Technical Release TR-55. The SCS Type II storm hyetograph specified for use in the Bozeman area applies to over 70 percent of the continental United States. Figure 2.2-3 (Comparison of USGS and SCS Hyetograph Methods) shows the SCS Type II distribution superimposed with the proposed USGS distribution developed in this study. The USGS distribution spreads the rainfall more evenly over the 24-hour period, resulting in lower peak rainfall than the SCS Type II distribution. For example, the two hours of highest intensity in the SCS Type II storm contain over 50 percent of the total storm volume, whereas the two hours of highest intensity in the custom design storm contain less than 25 percent of the total storm volume. Figure 2.2-3 Comparison of USGS and SCS Hyetograph Methods 0.000 0.025 0.050 0.075 0.100 0.125 0.150 0.175 0.200 0.225 0.250 0.275 0.300 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hrs) USGS SCS Type II Depth (in) Bozeman Storm Water Facilities Plan In summary, the USGS distribution is more representative of the types of storms that the greater Bozeman region would typically experience. The smaller intensities calculated using the USGS method result in lower peak runoff rates, which could result in smaller storm water control facilities and less overall infrastructure cost. The USGS method was chosen for this analysis because it uses data and equations developed specifically for Montana. 2.3 Hydrologic and Hydraulic Model Construction 2.3.1 Model Selection and Overview The Storm Water Management Model (SWMM) is a computer model developed by the U.S. Environmental Protection Agency (USEPA) for analysis of urban storm water runoff. SWMM was chosen to model the City of Bozeman’s storm water system because of its ability to model various hydrologic processes and hydraulic situations for both single-event and extended periods of time on pervious and impervious land surfaces, streams, pipes, and through groundwater. Data requirements for hydrologic simulations include area, percent imperviousness, slope, roughness, width, depression storage, and infiltration parameters. Up to 10 gages can be distributed spatially to develop precipitation and evaporation for runoff calculations. Simulation of snowmelt, subsurface drainage, and infiltration/inflow requires additional data. Some locations where overland flow is rare due to flat, sandy soils can be simulated using the subsurface drainage option in SWMM. 2.3.2 Modeling Approach The hydrologic and hydraulic computer model has two purposes: 1) to provide an overall, city-wide model that can be used immediately for large-scale planning purposes and 2) to provide for incremental refinement of the model over time as the completeness and accuracy of the storm drainage system inventory improves. The approach to meeting the above-stated goals was to set up a model that covers the entire study area in a general sense and includes a more detailed “pilot basin” area that demonstrates an increased level of detail that can be applied elsewhere with further improvements to the storm drainage system inventory. The pilot basin can be used as a template for future refinement and expansion of the SWMM model, until the entire study area is covered in detail. The SWMM model can be expanded incrementally as the missing system inventory data is filled in. The City’s prioritization of the areas to be modeled in detail will depend on first completing the storm drain inventory for the areas of interest. 2.3.3 Data Requirements Due to the complicated nature of hydrologic and hydraulic modeling, data requirements are extensive. Basic data requirements for the XP SWMM model are listed below. Hydrologic Information: • Catchments’ size, in acres 2-4 Chapter 2: System Analysis 2-5 • Basin width • Average slope • Soil infiltration rates • Rainfall intensity • Percent impervious Hydraulic Information: • Channel location • Channel cross-sections • Distance between cross-sections • Manning’s “n” (roughness) coefficient • Culvert invert elevations • Culvert size, shape, length, and material/roughness • Manhole locations, rim and invert elevations • Storm drain invert elevations • Storm drain size, shape, length, and material/roughness • Outfall locations Detailed descriptions of data requirements are provided in Appendix B (Storm Water System Analysis Data). A critical data set is the percent of impervious area under existing and future conditions. For existing conditions, the percent impervious area for each sub-catchment was calculated using the City’s 2004 land use inventory as shown in Figure 2.3-1 (Existing Land Use [2004]). For future conditions, the percent impervious area for each sub-catchment was calculated using the City’s 2020 Master Plan Map as shown in Figure 2.3-2 (Future Land Use [2020]). The impervious percentages used for the SWMM model are tabulated in Appendix B (Storm Water System Analysis Data) for each land use under existing conditions and under future conditions. 0 0 . 8 1 . 6 2 . 4 3 . 2 0. 4 Mi l e s FIGURE 2.3-1 Existing Land UseLegendCatchmentsLand Use - Spring 2004 Classification Administrative/Professional Commercial/Retail Commercial/Auto Church Duplex/Triple Residential Golf Hotel/Motel Light Manufacturing Mobile Home/Mobile Park Multi-Family Residential Mixed Use Public Facility/Park Restaurant/Bar Transportation School/Educational Facility Single Family Residential Vacant City Limits Streams Catchments 1 i n c h e q u a l s 6 , 0 0 0 f e e t Fi g u r e 3 . 2 Fu t u r e L a n d U s e ( 2 0 2 0 ) Pr a y Bo z e m a n Be l g r a d e Ma n h a t t a n Liv i n g s t o n Ga l l a t i n G a t e w a y Le g e n d Streets Streamlines City Limits 20 2 0 L a n d U s e P l a n Brush Rangeland Business Park Commercial Community Commercial Crop Pasture Evergreen Forest Golf Course Industrial Mixed Urban Neighborhood Commercial Other Public Lands Other Urban Parks, Open Space and Recreational Lands Public Institutions Range Grassland Regional Commercial and Services Residential Residential Infill Residential Limited Shrub Tundra Suburban Residential Transportation 00 . 5 1 1 . 5 2 0. 2 5 Mil e s ² Bozeman Storm Water Facilities Plan 2.3.4 Overall Model Setup The SWMM model was set up to encompass all areas that contribute runoff to the study area. Overall hydrology and conveyance through the entire study area was completed in a general sense to provide an overall model for large-scale planning. The overall model is shown on Figure 2.3-3 (Regional Drainage Network). In addition, a second, more detailed layer of data was included in a specific area identified as a pilot basin shown on Figure 2.3-4 (Pilot Basin Drainage Network). The pilot basin demonstrates an increased level of detail that can be applied elsewhere as further improvements are made to the storm drainage system inventory. This two-tiered approach will allow the City to immediately quantify pre-development, existing and future runoff for each delineated catchment in the study area based on the findings of this study. Accuracy of the model requires precise information about cross-sections, slopes and elevations of conveyance structures (open channels, pipes, manholes, etc.) and storage facilities. The approach used in this study allows the quantification of runoff and runoff impacts to be refined as the storm water system inventory is refined. SWMM requires two key elements to operate: nodes and links. Nodes normally consist of manholes, catch basins and culvert ends, but can also represent the connection of two or more links with differing attributes. Links normally consist of pipes and open channels. The overall model was created using the following sequential steps: 1. The entire area contributing hydrologically to the study area was subdivided into 42 sub-catchments. 2. The sub-catchments were linked together with links (conveyance structures) and nodes (connecting structures). Because actual data for the links and nodes was largely incomplete or unavailable, assumed values were used. 3. Runoff parameters were calculated for existing conditions as defined by the City’s most current land use inventory. 4. Runoff parameters were calculated for future conditions as defined by the City’s 2020 Community Plan. 5. Runoff parameters were calculated for pre-development conditions, assuming zero impervious area throughout. 6. Existing, pre-development, and future runoff hydrographs were developed for each catchment. 7. Existing and future impacts on peak flow and runoff volume were quantified for each catchment. 2.3.5 Pilot Basin Setup Following the overall model setup, a pilot basin (sub-catchment) was set up within the overall model framework. The pilot basin uses surveyed link and node data to evaluate a small, central area of the City to a greater level of detail, thus providing a template for future modeling efforts. The single model allows incremental refinement of any portion of the 2-8 Chapter 2: System Analysis study area and provides a framework for future refinement of different areas over time. It is also possible to select any defined sub-catchment or portion thereof and run the model for that portion only. The hydraulic modeling basin selected as the pilot basin for this study is the area draining to a 39-inch reinforced concrete pipe (RCP) outfall into Bozeman Creek. This outfall is located about 600 feet north of the Rouse Avenue/Lamme Street intersection and west of Rouse Avenue. The outfall collects runoff from a 370-acre catchment area generally bounded by Mendenhall Street south to Arthur Street, and 6th Avenue east to Wallace Avenue. The topography slopes from south to north at approximately 1½ to 2 percent. Land use is primarily residential, with increasing density moving from south to north. The northern end of the basin, between Babcock and Mendenhall Streets, is primarily impervious commercial/retail land use. The pilot basin is shown on Figure 2.3-4 (Pilot Basin Drainage Network). Generally, storm runoff in the pilot basin collects in the streets and enters clusters of curb inlets at the street intersections. The curb inlets are connected to several north-south oriented storm drain lines that manifold to a trunk line, which drains from west to east under the alley north of Main Street. The trunk line converges with the Church Avenue storm drain line at Rouse Avenue, and then heads north to the Bozeman Creek outfall. The model does not route surface runoff into the curb inlets, or from the inlets to the main storm drain lines. It is assumed that the curb inlets and connecting pipes have adequate capacity to convey surface runoff to the main storm drain pipes. Therefore, as a simplification, the model assumes inflow to the storm drain system enters the system at selected manholes. If the storm drain system has adequate capacity, curb inlet deficiencies will be easily observed at the street level during peak runoff e The pilot basin provides a starting point for developing a detailed system model. vents. To incorporate the pilot basin into the model, six of the original model’s sub-catchments were re-configured into 19 sub-catchments. The pilot basin sub-catchments, nodes and links use numeric nomenclature to differentiate them from the overall model. All surface runoff from a particular sub-catchment is assumed to enter the storm drain system at the most upstream manhole within that sub-catchment. If a capacity problem or other deficiency is identified, additional detail is possible by breaking sub-catchments in the area of the deficiency into smaller sub-catchments, one for each manhole. SWMM model input is summarized in Appendix B (Storm Water System Analysis Data). 2-9 EG 6 A EG 1 D EG 7 C EG 7 H EG 7 B EG 7 G EG 2 D EG 5 Q EG 2 A EG 1 B EG T 1 A EG 5 B EG 7 F EG T 2 A BC 1 A EG 7 K EG 7 L EG 7 S BC 2 F EG 2 C EG 5 P BC 2 E BC 2 A EG 1 F EG 2 E EG 1 A EG 4 B EG 1 C EG 5 G EG 4 A BC 3 B BC 3 A BC 2 B BC 2 C EG 3 A EG 1 G EG 4 C EG 6 B EG 1 E EG 2 B EG 5 E EG T 1 B FIGURE 2.3-3 City of Bozeman Regional Drainage NetworkPrayBozeman Be l g r a d e Ma n h a t t a n Livingston Ga l l a t i n G a t e w a y Legend Catchments Bozeman Creek East Gallatin River Streamlines City Limits Regional Drainage Basins Bozeman Creek Basin East Gallatin River BasinPark Co. Gallatin Co. Madison Co. E a st G allatin River Bozeman Creek Bozeman Area Watershed 01 2 3 4 0. 5 Mi l e s ² Bozeman Storm Water Facilities Plan 2-12 2.4 SWMM Model Results 2.4.1 Runoff Volumes In simple terms, the City’s drainage network consists of three groups of drainage areas (catchments), all of which drain to the East Gallatin River and its tributaries. One group of catchments, located within the City and to the immediate south, drains into Bozeman Creek which then runs north to its confluence with the East Gallatin River. Another group of catchments consists of areas to the southeast and southwest of Bozeman Creek that also drain northward into the East Gallatin River. The third and last group consists of areas north of the East Gallatin River, including areas north and west of the City limits, which drain to tributaries feeding into the East Gallatin River from the north. The Bozeman Creek catchments are especially important because they encompass a significantly larger percentage of high density urban development than the two East Gallatin River catchments. Therefore, the catchments were re-grouped into two major basins: Bozeman Creek, and the East Gallatin River excluding Bozeman Creek. From a regional perspective, this simplification makes readily apparent the level of impact that storm water runoff could potentially have on these two major river reaches. The following paragraphs describe three different development scenarios modeled for this project: pre-development, existing, and future development. Pre-Developed Conditions The analysis for pre-developed conditions assumes that the ground cover consists of no impervious areas. Therefore, these results provide an estimate of the total amount of storm water runoff that would occur without any urbanization. Existing Conditions The existing conditions analysis uses impervious areas as defined by the existing 2004 land use inventory shown in Figure 2.3- 1. The results show an increase in storm water runoff as compared to the pre- developed conditions. For example, under the 2-year event, storm water runoff has increased in the Bozeman Creek basin from about 11 to 30 percent of total precipitation and, in the 100-year event; runoff has increased from about 50 to 60 percent of total precipitation. These estimated increases in runoff are for comparison only, and do not account for either existing or future detention, retention or infiltration facilities. Bozeman’s rapid population growth and development can have significant impacts on storm water quantity and quality as well as storm water infrastructure needs. Chapter 2: System Analysis Future Conditions The future conditions analysis uses impervious areas estimated from future land uses as defined by the 2020 land use plan shown in Figure 2.3-2 (Future Land Use). As can be expected, when compared to existing conditions, the results show additional increases in storm water runoff due to projected future population growth. Using the previous example, future development in the Bozeman Creek basin under the 2-year storm event will result in storm water runoff increasing from about 30 to 42 percent of total precipitation in a 2-year storm event, and from about 60 to 67 percent of total precipitation in the 100-year event. As before, these estimated increases in runoff are for comparison only, and do not account for either existing or future detention, retention or infiltration facilities. Runoff associated with each development scenario is compared in Table 2.4-1 (Runoff for Development Scenarios). Table 2.4-1 Runoff for Development Scenarios Development Scenario Pre-Development Existing Future 2020 East Gallatin River Recurrence Interval Precip. (in) Runoff (in) % of Total Precip. Runoff (in) % of Total Precip. Runoff (in) % of Total Precip. 2-yr 1.18 0.15 12.7% 0.22 19.0% 0.35 29.5% 10-yr 1.96 0.68 34.8% 0.78 39.8% 0.94 48.0% 25-yr 2.10 0.80 38.0% 0.90 42.7% 1.06 50.5% 100-yr 2.81 1.43 51.0% 1.54 54.7% 1.71 61.0% Pre-Developed Existing Future 2020 Bozeman Creek Recurrence Interval Precip. (in) Runoff (in) % of Total Precip. Runoff (in) % of Total Precip. Runoff (in) % of Total Precip. 2-yr 1.18 0.13 11.1% 0.35 29.7% 0.50 42.0% 10-yr 1.96 0.65 33.3% 0.92 46.9% 1.11 56.8% 25-yr 2.10 0.77 36.4% 1.03 49.2% 1.23 58.7% 100-yr 2.81 1.40 49.8% 1.68 59.9% 1.89 67.3% Note: These estimated runoff percentages are for comparison only, and do not account for either existing or future detention, retention or infiltration facilities. 2.4.2 Overall Model Results Summary The XP SWMM model was set up with four different scenarios: Base, Pre-Development, Existing, and Future. The scenarios allow comparison of the same area under different development conditions. The model requires a Base Scenario as a basis for creating and editing the other scenarios; in this model, the Base Scenario was repeated as the Existing scenario. Therefore, the three sets of conditions analyzed were Pre-Development, Existing, and Future conditions. Each scenario was modeled using the 2, 10, 25, 50, and 100-year, 24-hour design storm using the Bozeman area 24-hour unit hyetograph illustrated in Section 2.2.1. The 2-hour hyetograph was also entered into the model, but was not used in the analysis. 2-13 Bozeman Storm Water Facilities Plan The results for the overall XP SWMM model are summarized in the output tables (see Appendix C-2, “Nodes, Output Data” and Appendix C-4, “Links, Output Data”). The output tables are only examples of the available output data. There are a large number of fields that can be added to or deleted from the tables, and several sets of output tables can be created and re-generated each time the model is modified and re-run. This flexibility allows the City to tailor output tables for specific uses and save as many tables as desired. The same holds true for the input tables. Nodes (Output Data) Table The “Nodes (Output Data)” table included in Appendix C (XP Tables) lists, for each design storm under each scenario, several values including the total node inflow volume, peak flow rate passing through the node, maximum water surface elevation (max. WSEL), grate or rim elevation, and freeboard to maximum WSEL. A freeboard elevation of 0.00 identifies surface flooding areas. It must be noted that the model does not identify catchments for each and every storm drain inlet. To simplify the model given the level of detail that exists in the system inventory, catchment areas representing several storm drain inlets were “front-loaded” to a nearby manhole at the upstream end of the area in question, to represent a worst-case scenario in terms of system capacity. Nodes that indicate flooding (i.e., freeboard ≤ 0.00 feet) in a 2-year storm may in fact have adequate capacity, once further refinements are made to the model. Links (Output Data) Table The “Links (Output Data)” table included in Appendix C (XP Tables) lists, for each design storm under each scenario, several values including the peak flow rate, maximum velocity, and upstream/downstream invert elevations. For the same reason given above for the “Nodes (Output Data)” table, the maximum velocity values in the “Links (Output Data)” table include some very high velocities, and some negative velocities attributed to backflow through the system. These results will also be corrected as additional inventory data is incorporated into the model. The pilot basin results are incorporated in the overall output tables and can be identified by the numeric node and link names, as opposed to the alpha-numeric labels for the overall model outside the pilot basin. The tables may be copied into an Excel file for editing. 2.4.3 Graphical Encoding An illustration of the usefulness of the model is the ability to create visual representations of the system. For example, Figure 2.4-1 (Graphical Encoding), which represents the results from a 2-year, 24-hour storm for the pilot basin under existing conditions, was created within XP SWMM using the “graphical encoding” feature. This feature allows color-coding and size-coding to represent specific ranges of a selected parameter. In the example of Figure 2.4-1 (Graphical Encoding), freeboard at each node is represented by three different colors representing freeboard of -20.0 to 0.1 feet (red), 0.01 to 2.0 feet (green), and 2.0 to 20.0 feet (blue). Node size is also related to feet of freeboard, with larger node symbols representing less freeboard depth. Similarly, the ratio of maximum flow divided by design flow for each link is represented by three different colors representing a ratio of 0.0 to 1.0 (red), 1.0 to 2.0 (green), and 2.0 or more (blue). Link line 2-14 Chapter 2: System Analysis weights are also related to this ratio. The results of this example allow immediate identification of nodes where flooding occurs. The color and size codes can be changed to identify virtually any “trigger” value for a number of different parameters. Figure 2.4-1 Graphical Encoding 2-15 Bozeman Storm Water Facilities Plan 2.5 Hydrologic Model Verification 2.5.1 Comparison to Peak Stream Flows In lieu of detailed stream flow data and precipitation data, the SWMM model results were compared to peak stream flow measurements at a USGS gage (No. 06048000 East Gallatin River). The largest recorded stream flow at this gage was 2,460 cfs on May 22, 1981. On May 21, the Bozeman Gallatin Field AP weather station recorded 1.47 inches of rain and the next day, May 22, an additional 0.97 inches of rain was recorded. This amount of precipitation would be equivalent to between a 2-year and 10-year event. At the approximate location of this stream gage, for a 1.47 inch 24-hour storm event, the model produced a total surface runoff of 1,031 cfs. The difference between the recorded value of 2,460 cfs and the modeled value of 1,031 cfs is probably due to a couple of factors; 1.) The drainage area measured by the stream gage is about 50% larger than that of the modeled area, and 2.) The model does not include base flows or the groundwater contribution to stream flow. 2.5.2 Flow Monitoring 2-16 Continuous flow monitoring before, during, and after a storm event, combined with incremental rainfall data for the same time period, can be used to calibrate the SWMM model. Selecting monitoring points that together represent the entire study area will provide a basis for city- wide calibration and greater accuracy. The monitoring points selected will provide representative data for the entire city. The flow monitoring data must include incremental rainfall depths and runoff rates spanning the duration of the storm, and the associated runoff back to zero/base flow conditions. Weather conditions for the period preceding the storm is an important factor in estimating soil moisture conditions or saturation level at the beginning of the storm. Flow monitoring data should be exported to excel and stored in the same location as the pilot basin model. Flow data will be used in future model calibrations. The drainage system inventory and quarter-section grid maps (see Chapter 1 Existing System Inventory) were reviewed to locate large outfall pipes or sub-basins draining areas that are representative of the study area as a whole. The following seven locations were selected as recommended monitoring points and are listed in order from highest to lowest priority. Chapter 2: System Analysis Table 2.5-1 Recommended Flow Monitoring Points Priority No. Location Reasoning 1 39" RCP Outfall North of Rouse & Lamme Intersection Outfall for the pilot modeling basin. Data will be helpful for calibrating the pilot basin portion of the model. Data will also provide a basis for future modeling of the remaining older parts of town, which have few detention ponds. 2 Harmon Ditch at Oak St. Outfall (west of 15th St.) Monitoring at this location will provide a basis for future modeling of the more recently developed areas which have 10- year detention ponds. 3 Farmers Canal at Oak Street Outfall This location will allow monitoring of combined flows (irrigation base flow plus storm runoff) of the Farmers Canal. Subtracting out the average (pre- and post-storm) base flow can provide an estimate of storm runoff originating south of College Street. This will help identify alternatives for handling the combined irrigation flows and storm runoff to resolve flooding issues. These alternatives could include some combination of detention, conveyance or upstream diversion into other streams or ditches. 4 Farmer's Canal at South Side of College, 14' x 4' Box Inlet Monitoring at this location, combined with the above-mentioned monitoring at the Oak Street outfall, would provide a better estimate of base/irrigation flow vs. storm runoff, and would provide better overall data by independently monitoring ditch flows originating in the mostly undeveloped, upper basin (the area south of College Street). 5 40" x 65" Outfall at 11th & Main This outfall drains most of the area from 15th Avenue to 10th Avenue, and from Main Street to College Street. It seems likely that this outfall also picks up runoff from major drainages south of College Street; for example, the 48" RCP directly south of the Roskie/Hedges dorm complex. 6 30" Outfall on 9th & Villard This outfall drains most of the area from 10th Avenue to 5th Avenue, and from Villard Street to Harrison Street. This outfall may also pick up runoff from a ditch heading into the above-mentioned 11th & Main outfall (Item 5 above). This location is similar to Item 1, hence the lower priority. However, if runoff from 11th Avenue enters this system, it may be unique enough to monitor. 7 36" Outfall on 4th & Peach This outfall is mentioned because it drains a fairly large area including most of the area from 8th to Grand, and from Peach to Mendenhall. If other outfalls are physically difficult to monitor, this outfall could be used as a substitute. 2-17 Bozeman Storm Water Facilities Plan 2-18 2.6 Retention and Detention Storm water detention is commonly used to mitigate the impacts of increased peak runoff rates associated with increased urbanization (i.e., increased area of impervious surfaces). Although detention is effective in reducing peak runoff rates to pre-development values, the total volume of runoff is largely unaffected, and is merely released over a much longer time span. The prolonged duration of higher than historic flow rates can cause impacts such as bank erosion of natural drainageways, and subsequent sediment deposition and flooding. On the other hand, retention and infiltration can be used to reduce net runoff volumes closer to pre-development volumes. This use of retention and infiltration is best applied at the source, by routing storm runoff over pervious surfaces before directing it into natural or constructed drainageways and pipes. Natural drainageways have some capacity to absorb increased runoff duration with minimal impacts. Some combination of peak flow reduction (detention) coupled with volume reduction (retention/infiltration) is usually acceptable. Reducing a detention basin’s release rate to something less than the pre-development peak rate is a common practice that tends to balance runoff rate (peak) control and volume (duration) control. 2.6.1 Retention Volume Comparisons As a planning tool, overall retention volumes for an urban watershed can be approximated by comparing total runoff under a base scenario, normally existing or pre-development conditions, to total runoff under a future scenario. The difference between these values would be the estimated retention volume required to maintain the same runoff as the base scenario. Table 2.6-1 (Retention Volume Comparisons) lists total runoff volumes for the portions of the Bozeman Creek and East Gallatin River watersheds that apply to the study area and used the above-described method to estimate overall retention volumes for each of these two sub-basins. Impacts of increased runoff volume will be felt by these two significant natural channels, as well as by localized impacts within smaller upstream sub-catchment areas, if retention approximating the tabulated volumes is not provided. Chapter 2: System Analysis Table 2.6-1 Retention Volume Comparisons East Gallatin River Bozeman Creek Recurrence Interval (yrs) Recurrence Interval (yrs) 2 10 25 100 2 10 25 100 Total Runoff Volume (ac-ft) Pre-Development 430 2,536 2,964 5,324 49 243 284 520 Existing 834 2,896 3,330 5,715 130 341 384 624 Future 1,292 3,494 3,941 6,371 184 413 458 702 Future with Low Impact Development 1,231 3,418 3,863 6,287 172 398 442 686 Retention Volume Required to match Pre-Development Conditions (ac-ft) Future 862 958 978 1,047 136 170 174 183 Future with Low Impact Development 801 881 899 963 123 155 158 167 Retention Volume Required to match Existing Conditions (ac-ft) Future 458 599 611 656 54 72 74 78 Future with Low Impact Development 397 522 533 572 42 57 58 62 The above results show that significant additional retention (or detention) volume would be needed to mitigate the impacts of future development. For example, to meet pre-development conditions for total runoff under future conditions (i.e., full build-out under the proposed 2020 land use plan), a total of 170 ac-ft of detention/retention would be needed within the Bozeman Creek drainage area to mitigate for the impacts resulting from a 10-year event. To mitigate for a 25-year event in the same area under the same development criteria, 174 ac-ft would be necessary. 2.6.2 Regional Runoff Control Regional runoff control would involve the construction of regional detention facilities to provide the storage to mitigate for the increases in storm water runoff resulting from increased urbanization. As a conservative, simplified approximation, the detention volumes were calculated assuming zero outflow (i.e., full retention). A typical storm water detention facility would have a depth of no more than four feet. Under these assumptions, the overall land area required to offset increases in runoff volumes has been summarized in Table 2.6-2 (Area Required for Regional Retention Facilities). For example, for the 10-year event within the Bozeman Creek basin, the City would require a total land area of 43 acres to meet pre-development conditions, or 18 acres to meet existing conditions. 2-19 Bozeman Storm Water Facilities Plan Table 2.6-2 Area Required for Regional Retention Facilities Bozeman Creek East Gallatin River Recurrence Interval (yrs) 2 10 25 100 2 10 25 100 Retention Area Required to Match Pre-Development Conditions (acres) 34 43 43 46 216 239 244 262 Percent of Total Land Area 0.8 1.0 1.0 1.0 0.5 0.5 0.5 0.6 Retention Area Required to Match Existing Conditions 14 18 18 20 115 150 153 164 Percent of Total Land Area 0.3 0.4 0.4 0.4 0.3 0.3 0.3 0.4 NOTE: Land area assumes maximum pond depth of 4 feet, and assumes there are no existing retention facilities. 2.7 Existing Storm Water System Deficiencies The City of Bozeman has experienced consistently rapid population growth and development over the past several years. This impacts storm water runoff by adding impervious surfaces and sources of pollution. During the existing system inventory evaluation, interviews, and field work, several deficiencies or problem areas were identified; many of these are historic flooding locations in the City of Bozeman. Known storm water system deficiencies were identified through field investigations and interviews with representatives of the City of Bozeman, canal companies and Gallatin County. These deficiencies are listed by priority in Table 2.7-1 and are shown in Figure 2.7-1; both titled Areas of Known Flooding. 2-20 Chapter 2: System Analysis Table 2.7-1 Areas of Known Flooding Priority Location/ Name Potential Causes 1 Farmer's Canal Farmer’s canal has insufficient capacity, particularly through developed areas. Some adjacent residential units are built at lower elevations than the canal. Numerous drainages cross the canal, some of which provide additional flow. Large storm water drainage areas also contribute flow. 2 20th Avenue This open ditch receives no maintenance, and has insufficient capacity. Irrigation and runoff flowing into the pipe south of Koch Street have backed up and flooded into Koch Street in the past. This problem may have been resolved when flows from the Farmers Canal were closed off (currently, no water rights are being used). 3 Wagon Wheel Ditch This open ditch has insufficient capacity and unstable banks in some areas. 4 Valley Unit Park The homes along Meagher Avenue south of Durston Road and east of the park have experienced basement flooding. These homes are just east of a large detention pond that may at times elevate groundwater in the area. Potential solutions include reducing the water storage time using an improved pond outlet and/or reducing the peak water surface elevation of the detention pond. 5 Willson and Cleveland Manhole lids in this area ‘pop’ open, apparently due to undersized piping. 6 Willson and Garfield Manhole lids in this area ‘pop’ open, apparently due to undersized piping. 7 Resort Drive This is an area of new development and increased impervious surfaces. There is high ground water in the area, and no maintenance has been done to open ditches. 8 Peach Street No maintenance is performed on the open ditch. However, city staff indicated that flooding has not been seen in the area for 10 years or so. 9 North 11th Avenue No maintenance is performed on the open ditch. Improvements on Durston Rd. completed in 2007, which should help at the north end. 10 Rocky Creek This creek has been impaired from channel incisement, bank erosion, and sedimentation from development runoff and agricultural practices. Rocky Creek was 303(d) listed in 2002. In addition, noxious weeds are becoming an increasing problem along the creek. 11 Auction and Feedlot Beavers are the primary problem; they cause water to dam up, and it comes very close to the feedlot retention pond elevation. 2-21 Bozeman Storm Water Facilities Plan 2-22 Table 2.7-1 Areas of Known Flooding Priority Location/ Name Potential Causes 12 I-90/East Main Interchange North of the eastbound on-ramp and across the frontage road from this area, flooding has occurred in the past due to poor drainage and/or inadequate infiltration. There has not been a problem recently, possibly due to interchange improvements made by the Montana Department of Transportation. 13 Sod Farm Problems usually occur during a late winter melt while the ground is still frozen. Runoff flows north to a school and more development. The drainage ditch is usually full of snow from plowing off S. 3rd, leaving the water no where to go. In addition, culverts are not properly maintained. 14 Rouse Ave. The storm water pipe along Rouse Avenue is about 90 years old. This pipe is in need of replacement, and has failed in certain areas forcing the City to perform emergency repairs. Farmer’s Canal receives a significant amount of offsite storm water. Chapter 2: System Analysis The area at College St. and west of 23rd overtops during storm events due to limited ditch capacity. City staff removes debris from storm drain ditches seasonally during runoff events. Farmer’s Canal along College St. In addition to those problem listed in the table above, ice blockages are created in Bozeman Creek. 2-23 Farmer's CanalPriority 1 Sod FarmPriority 14 20th AvePriority 2 Resort DrivePriority 7 Valley ParkPriority 4 Drainage WayPriority 13 Rocky Creek Priority 10 Peach Street Priority 9 Auction and FeedlotPriority 12 Wilson and Garfield Priority 5 Wilson and ClevelandPriority 5 MAIN 5TH 7TH OLIVE BEALL 11TH 3RD 9TH BLACK TRACY GRANDVILLARD LAMME 10TH BABCOCK PEACH WILLSON ALLEY MENDENHALL 4TH 8TH 6TH SHORT DURSTON COTTONWOOD 7TH ALLEY 8TH ALLEY 4TH ALLEY ALLEY7TH 3RD 9TH ALLEY ALLEY ALLEY ALLEY ALLEY ALLEY ALLEY LAMME 8THALLEY ALLEY ALLEY ALLEY ALLEY 10TH 5TH 4TH 3RD6TH 7TH GRAND GRANT COLLEGE WILLSON HARRISON ALLEY 8TH GARFIELD TRACY HAYES CLEVELAND BLACK ARTHUR BOZEMAN ALLEY ALLEY ALLEY TRACY ALLEY 7TH ALLEY ALLEY ALLEY ALLEY ALLEY ALLEY8TH BLACK DURSTON BABCOCK M AIN HUFFINE FALLON ROSE 25TH HUNTERS FERGUSON 27TH COTTONWOOD LILY VALLEY SANDERS TETON RESORT MEAGHER FOWLER DONNAWILDA DRIVEWAY ALLEY GREENWAY L GRIFFIN ST O R Y M I L L HILLSIDE GOLD DRIVEWAY G O L D DRIVEWAY D R IVE WA Y DRIVEWAY Legend Flood Areas City Limits Streets Streams ² 0 1 2 0.5 Miles Figure 2.7-1 Areas of Known Flooding Bozeman Storm Water Facilities Plan Chapter 3. Policy Evaluation Chapter 3: Policy Evaluation 3-i Table of Contents 3.1 Introduction ........................................................................................................................3-1 3.2 Existing Storm Water Policy Summary...........................................................................3-1 3.3 Regional Approaches toward Storm Water Management and Mitigation .................3-1 3.3.1 Hydrologic Considerations ...........................................................................................3-2 3.3.2 Financial and Political Considerations ........................................................................3-2 3.4 Case Studies: Evaluating Regional Storm Water Management Policies....................3-3 3.5 Storm Water Policy Considerations.................................................................................3-6 3.5.1 Flood Control ............................................................................................................3-6 3.5.2 Channel Stability/Regional Detention........................................................................3-6 3.5.3 Water Quality..................................................................................................................3-7 3.5.4 Hydrologic and Hydraulic Analysis Methods............................................................3-8 3.5.5 Design Policy and Submittal Requirements...............................................................3-8 3.5.6 Construction and Operation and Maintenance Responsibilities ............................3-8 3.5.7 Storm Water Policy Considerations - Summary........................................................3-9 3.6 Storm Water Policy Recommendations ........................................................................3-15 3.6.1 Existing Storm Water Policy Summary ....................................................................3-15 3.6.2 Storm Water Policy Recommendations....................................................................3-15 Tables Table 3.4-1 Summary of Storm Water Policies in the Region..................................................3-4 Table 3.5-1 Storm Water Policy Considerations .......................................................................3-10 Table 3.6- 1 Runoff Coefficients for the Rational Method .....................................................3-21 Chapter 3: Policy Evaluation 3.1 Introduction This evaluation of current City of Bozeman policy begins with a description of existing City storm water management engineering standards and policies. The existing policies are compared to various other standards and policies used in the Rocky Mountain region, followed by a discussion of the pros and cons of various aspects of storm water management policy. 3.2 Existing Storm Water Policy Summary This section summarizes the existing City of Bozeman storm water management engineering standards and policies. The City’s current storm water policy is presented in the City of Bozeman Design Standards and Specifications Policy. The policy includes general design guidance for storage and treatment facilities, discharge structures, and estimating runoff quantities for design. The current policy includes the following statements: • “The storm water drainage plan shall be designed to limit storm water runoff from the development site to the pre-development runoff rates.” • “The storm water storage and treatment facilities shall be designed to remove solids, silt, oils, grease, and other pollutants.” • “Storm sewer facilities shall be designed to handle a 25-year storm event.” • “Retention ponds shall be sized based on a 10-year, 2- hour storm intensity.” • On detention basins: “The release rate is equivalent to the pre-development runoff rate at the piping system design frequency…” This correlates to a 2- year recurrence interval for open land, and a 10-year recurrence interval for residential, commercial or industrial land. The City’s current storm water policy is documented in the Design Standards and Specifications Policy. • “The Rational Method shall be used to determine peak runoff rates with a slight modification of the method to determine runoff volumes.” 3.3 Regional Approaches toward Storm Water Management and Mitigation The following discussion compares the regional or utility-managed approach towards storm water management and mitigation with the method currently used by the City of Bozeman, which mandates developers to mitigate for increased storm water on-site. Properly located and designed regional detention systems can work, and several cities in the United States have a buy-in policy to the regional facility in-lieu of on-site detention of storm water. In order to generate funds for the creation and management of regional facilities, 3-1 Bozeman Storm Water Facilities Plan municipalities typically form storm water utilities, either through enterprise or tax bonds. Thus, there are numerous hydrologic, social, and political considerations that must be weighed when comparing regional versus individual approaches to storm water management and mitigation. 3.3.1 Hydrologic Considerations The developer's location relative to the regional ponds matters a great deal. If development is planned downstream of the ponds, or if the development is substantially upstream of the regional ponds, intervening property between the development and detention pond can flood. Also, a series of larger detention ponds needs to be carefully planned and modeled to ensure that as a drainage system, the ponds don’t exacerbate flooding in certain downstream areas by causing a higher coincident peak flow, with slow-moving storm events pummeling downstream when the upstream ponds are still releasing substantial water. Given the regional context and extent of development occurring within the City of Bozeman, it is likely that regional detention facilities alone will not result in effective storm water management or maintenance of existing storm water infrastructure. Further, relying on developers alone to mitigate storm water events is often unsuccessful, due to poorly planned and executed storm water infrastructure construction by some developers. Consequently, the City would benefit from a combined regional and individual approach towards storm water management. 3.3.2 Financial and Political Considerations In addition to the hydrologic and hydraulic parameters that must be evaluated prior to adopting a regional approach towards storm water management, there are numerous financial, social, and political elements of this process that also must be considered. For example, prior to forming a storm water utility, a municipality must decide: • Will the utility be created with enterprise funds or with tax bonds? • What will be the definition of impervious cover? • Will the state tax database provide enough detailed information to evaluate impervious cover? • Who, if anyone, will the city exempt from paying storm utility fees? • How will the city organize the utility? As a part of an existing organization or as its own entity? • Where will the utility reside? • How and to whom will the city grant storm water utility credits? • How will the city determine the storm water utility fee? This list is not exhaustive, but does indicate the importance of completing a feasibility analysis to evaluate the best means of establishing, organizing, funding and maintaining a storm water utility. Thus, a recommendation that the City complete a feasibility analysis to determine the benefits and constraints of storm water utility establishment is described in 3-2 Chapter 3: Policy Evaluation 3-3 Chapter 6 (Recommended Plan). Further, it is recommended that the city create a storm water utility to fund and manage regional storm water facilities. 3.4 Case Studies: Evaluating Regional Storm Water Management Policies The rapid development occurring in the Bozeman area has been experienced elsewhere in the region, in areas with similar hydrologic basin characteristics. It is possible that existing or previous policies and design procedures may play some part in the development of existing flooding problems. Therefore, an informal survey of public agencies in Colorado, Wyoming, and Montana was conducted to gain a general sense of municipal and regional storm water management policies, specifically with regard to volume controls and requirements for storm water treatment. The agencies that were contacted are located in areas with similar climate, geography, and precipitation. The Colorado Front Range in particular is experiencing rapid population growth similar to growth in the Gallatin Valley. Results of the survey, along with a summary of Bozeman’s current policy, are summarized in Table 3.4-1. Bozeman Storm Water Facilities Plan Table 3.4-1 Summary of Storm Water Policies in the Region Agency Detention/Retention Requirements Water Quality Requirements Methods Other Policy Considerations Bozeman, Montana Detention: Detain 10-year runoff to the pre-development rate. Where the potential for major property damage exists, use a 100-year design frequency. Retention: Size based on a 10-year, 2-hour storm. Use retention only where discharge is not feasible or desirable. Design storage and treatment facilities to remove solids, silt, oils, grease and other pollutants. Sediment Control: Detention/retention basins must have a minimum area of 145 sq. ft. per 1 cfs release rate. Provide 9” sumps in inlets and manholes. Rational Method shall be used to determine runoff volumes and peak runoff rates. Design conveyance structures for a 25-year storm event. No storm water utility. Developers conduct mitigation for increased runoff on a site-by-site basis. Billings, Montana Limit discharge to 0.56 cfs per 2 acres; detain or retain any excess drainage on-site. Limit peak runoff to pre-development flow rate if waters drain into a critical flood drainage and/or erosion problem area. Use SCS hydrograph or SWMM3 method for developments greater than 2 acres; otherwise the modified Rational Method may be used. Flow may not be concentrated onto downstream properties where sheet flow previously existed. Billings has a storm water utility. Kalispell, Montana Detain 10-year and 100-year peak runoff to the respective pre-development rates. Locate ponds at least 200 feet from any public facility where children can be expected to congregate. A storm water report addressing MPDES requirements is required for developments greater than 10,000 square feet. Use precipitation values in the MDT Hydrology Manual. Rational Method may be used for areas of 10 acres or less. For larger areas, consult the City Engineer. 3-4 Chapter 3: Policy Evaluation 3-5 Table 3.4-1 Summary of Storm Water Policies in the Region Agency Detention/Retention Requirements Water Quality Requirements Methods Other Policy Considerations Urban Drainage and Flood Control District, Colorado Post-development peak runoff rate must be no greater than the pre-development rate for the 100-year storm, and also for either the 5- or 10-year event (100-year and 10-year is most common within the district). An added “water quality” detention volume, in addition to “flood control” detention, is recommended. Use hydrograph detention pond routing for catchments of 90 acres or greater, and for all catchments with more than one detention pond. Requirements can be adjusted if development is immediately upstream of a regional detention pond. City of Fort Collins, Colorado 100-year maximum release rates vary from the 2-year pre-development rate to the 100-year post-development rate, depending on location within the Master Plan coverage area. Must provide a “water quality capture” area of ¼-inch per acre, to be released over a 40-hour period. In accordance with the Urban Drainage and Flood Control District’s guidelines. Runoff originating off-site may be “passed through” the site (i.e., around the on-site detention facilities). City of Loveland, Colorado Detain 10-year and 100-year peak runoff to the respective pre-development rates. Treatment in accordance with the Urban Drainage and Flood Control District’s guidelines is required. In accordance with the Urban Drainage and Flood Control District’s guidelines. City of Laramie, Wyoming Detain 100-year peak runoff to the 100-year pre-development rate. A “water quality” design storm will probably be added to address Phase 2 NPDES permit requirements. City of Sheridan, Wyoming Detain the 10-year peak runoff to the 10-year pre-development rate. Commercial areas are also required to detain the 100-year storm to the 100-year pre-development rate. Regulations are being updated to include the 100-year detention requirement for all new development. Bozeman Storm Water Facilities Plan 3.5 Storm Water Policy Considerations In general, urban development increases the amount of impervious surfaces, which increases storm runoff quantity, peak flow rates, and water quality impacts. Controlling storm water and protecting water resources is vital for flood control and for maintaining fish and wildlife habitat, human health, and recreation. An effective storm water policy would minimize disruption of the natural hydrologic cycle to the extent possible, while efficiently managing the City’s resources (i.e. capital, land and operation and maintenance costs). In reviewing the City of Bozeman and other storm water policies, the following parameters were considered. Storm Water Policy Considerations: Flood Control Channel Stability/Regional Detention Water Quality Hydrologic & Hydraulic Analysis Methods Design Policy and Submittal Requirements Construction and O & M Responsibilities 3.5.1 Flood Control Increased impervious surface area increases the peak flow rate and the overall volume of storm water runoff, therefore increasing the frequency and severity of flooding occurrences. To regulate and control flooding, an effective storm water policy should require attenuation of runoff volume to simulate, as much as possible, the runoff characteristics of the pre-development (natural) drainage ways. Attenuation can be a combination of detention, retention, and infiltration. Limiting post-development peak runoff rate to some percentage (usually 100 percent) of the pre-development rate for a specific design storm is often used as a way to regulate and require flood control. However, if detention is relied upon to meet these criteria, the timing of release from a large number of detention ponds may actually be detrimental by prolonging high runoff in the major drainage ways. To compensate for this problem, release rates may be restricted for two or more different design storms, and the peak release rates may be restricted to something less than 100 percent of the pre-development peak rates. Detention volume requirements can be significantly reduced by using low impact development practices. Low impact development is a new approach to storm water management that focuses on managing rainfall and runoff at the source using a large number of runoff reduction and water quality BMPs. Related to low impact development is the LEED (Leadership in Energy and Environmental Design) rating system for “green” building development. The LEED rating system encourages low impact development practices by awarding “points” toward LEED certification. Although many low impact development BMPs rely on infiltration, many others can be effective in Bozeman’s climate. Refer to Appendix D-1 (Low Impact Development) for additional information, including a more detailed description of the LEED certification program. 3.5.2 Channel Stability/Regional Detention Increases in storm water runoff volume and peak flow rates associated with development tend to destabilize stream channels. Stream channel destabilization can take the form of 3-6 Chapter 3: Policy Evaluation downcutting erosion, “headcutting” erosion (erosion that progresses in an upstream direction), or bank erosion which increases the width between stream banks. Furthermore, sediment from these eroded areas can deposit in low-gradient, low-velocity downstream areas, which can elevate stream beds and cause increased flooding and/or additional stream bank erosion. When these processes result in wide, shallow streams, the increased exposure to direct sunlight can decrease habitat and recreational values. Bozeman Creek and Mandeville Creek have unstable reaches with heavy sedimentation. In Mandeville Creek, the macro invertebrate population is weighted heavily towards sediment tolerant organisms and has relatively low species diversity. Much of the upstream areas of these creeks, where the sediment likely originates, are not in the city limits. Nevertheless, the city policies should at a minimum, maintain upstream water quality and not exacerbate the problem. To address these issues, the storm water policy should control or minimize flow rates and/or durations capable of moving large amounts of sediment, generally by using detention, retention or infiltration. Protecting channel stability will help to maintain riparian vegetation and canopy shading for bank stabilization and water temperature control. Reducing channel flows to minimize bank erosion will likely result in a more restrictive runoff control policy than for flood control alone; therefore, the benefit of such a program must be weighed against the cost to provide the additional runoff volume reduction or detention volume. This is difficult to evaluate on a city-wide basis and is best addressed in future master plans for each of the major drainage ways in the study area. Low impact development is a relatively new approach to reducing urban runoff volumes that may be feasible to implement on a city-wide basis. Examples of low impact development are presented in Appendix D-1. 3.5.3 Water Quality Storm water runoff from impervious surfaces, such as roads, parking lots, roofs and sidewalks, can contain oil, grease, trash, hydrocarbons, metals and other contaminants. Directly connected impervious areas (those connected directly to a storm drain or ditch rather than first running as shallow flow through pervious or vegetated areas) are the most difficult areas to treat effectively. Infiltration practices are much more efficient than contaminant removal from concentrated flows. Therefore, the most effective and least costly storm water policy should encourage infiltration practices, such as sheet flow from impervious to pervious areas, disconnected downspouts, and infiltration galleries. A second, less effective but essential policy would be to recommend or require appropriate treatment facilities and processes to separate sediment and other contaminants after they become suspended in concentrated runoff streams. As a side benefit, storm water quality measures that utilize retention and infiltration, such as grass swales, can be effective in reducing peak and net runoff, thereby reducing size requirements for downstream detention/retention ponds and regional storm water runoff control facilities. Infiltration can also be provided in combination with detention; for example, underground detention systems with infiltration capabilities are becoming more common in Bozeman area developments. Runoff from construction sites can be a major contributor of sediment to the existing storm drain system, especially in an area experiencing rapid growth, such as the Bozeman area. The Montana Department of Environmental Quality (MDEQ) administers a state-wide MPDES 3-7 Bozeman Storm Water Facilities Plan storm water permit program for construction activities, which covers construction sites with over one acre of disturbance area, including those in Bozeman. This program regulates construction site runoff with regard to control of erosion, sediment and other pollutants. MDEQ provides guidance in selecting temporary BMPs that will control site runoff until vegetation or other ground cover is in place and well established. A more detailed water quality discussion is presented in Chapter 5; this chapter describes the recommended approach towards implementing a Storm Water Quality Plan to comply with the City’s MPDES permit. 3.5.4 Hydrologic and Hydraulic Analysis Methods A major policy consideration with respect to design submittals is to determine the type of hydrologic and hydraulic model that should be required. The accuracy and level of detail desired by the City must be weighed against the difficulty of preparing and reviewing the model. A more sophisticated model may require extensive data input and training to use, and therefore may be unrealistic for widespread use. Conversely, a simplified model may be inaccurate for large developments, especially when analyzing the effects on downstream drainage ways. Utilization of local rainfall data, for example generating unit hyetographs, provides more accurate results than using regional, statistical methods to determine rainfall distributions. From simplest to most difficult, three approaches are the Rational method, hydrograph routing methods such as SCS TR-55, and continuous simulation. The Rational method, currently used by the City, is a peak flow model that has been modified to provide simplified detention estimates. These estimates may be acceptable on a small scale, but become less accurate as the study area increases (estimates generally put the upper limit at 20 to 100 acres). Hydrograph routing methods are commonly used and should provide enough accuracy for the City’s purposes. Continuous simulation requires large amounts of input data including actual precipitation data, and is beyond the training of many professional engineers. Therefore, requiring the use of a continuous simulation model would be expensive to the developers and would complicate the City’s review process. 3.5.5 Design Policy and Submittal Requirements Design requirements for storm water facilities should be presented in a clear, concise manner to assure consistent submittals that allow for relatively easy review. Storm drainage plan submittals for all developments should be presented in a standard format and should include maps, calculations, details and specifications. The City should encourage or require data to be submitted in a format compatible with the City’s system (i.e. GIS, SWMM, excel). The City should recommend preferred hydrologic and hydraulic tools, methods, and standards to facilitate storm water policy implementation. Depending on the number of changes to existing policy, an amended policy may take the form of a set of modifications to existing policy, or a complete re-issue. 3.5.6 Construction and Operation and Maintenance Responsibilities Design policy should outline who is responsible for constructing, operating and maintaining the various segments of the storm water infrastructure. A qualitative rating system would 3-8 Chapter 3: Policy Evaluation 3-9 enable the City to better manage existing storm water infrastructure with regard to operation, maintenance, and replacement. Two examples of rating systems for pipes are presented in Appendix E (Infrastructure Rating System Alternatives). For storm water infrastructure related to a specific development, the City may assign responsibility for construction and O&M costs to the developer and/or a subsequent property owners association. This approach typically neglects off-site impacts and focuses on on-site conveyance and detention. The cumulative effects of numerous small ponds could reduce overall flood control effectiveness in major (downstream) drainage ways. If these cumulative impacts are not addressed proactively, regional detention may become an unplanned necessity at some time in the future, resulting in higher land acquisition costs. For flows originating offsite, and for downstream impacts associated with the development, the need for improved conveyance or additional detention should be addressed, as well as who would be responsible for construction, operation and maintenance of the improvements. For many projects, a blend of developer, property owner and municipal funding and construction/O&M responsibilities may result in the most optimal long-term use of funds and man-hours. 3.5.7 Storm Water Policy Considerations - Summary The key aspects of storm water policy described above are summarized in Table 3.5-1 (Storm Water Policy Considerations). For each parameter, existing City of Bozeman practices and alternative approaches have been listed with considerations (pros and cons) that may be helpful in the decision making process. Recommended policy changes are presented in Chapter 6. Bo z e m a n S t o r m W a t e r F a c i l i t i e s P l a n Ta b l e 3 . 5 - 1 S t o r m W a t e r P o l i c y C o n s i d e r a t i o n s El e m e n t Ap p r o a c h Pr o s Co n s Cu r r e n t A p p r o a c h : L i m i t s t o r m w a t e r r u n o f f t o pr e - d e v e l o p m e n t r u n o f f r a t e s f o r t h e 1 0 - y e a r , 2 - hr s t o r m . Mi n i m i z e s r e q u i r e d d e t e n t i o n a r e a . Si m p l i f i e s d e s i g n , m a i n t e n a n c e , a n d op e r a t i o n . In c r e a s e d d e v e l o p m e n t c o u l d r e s u l t i n a n in c r e a s e d p r o b a b i l i t y o f f l o o d i n g d u r i n g la r g e , i n f r e q u e n t s t o r m s . Fl o o d C o n t r o l Al t e r n a t i v e A p p r o a c h : R e q u i r e t w o - s t a g e f l o o d co n t r o l , s u c h a s l i m i t i n g p o s t - d e v e l o p m e n t ru n o f f t o t h e p r e - d e v e l o p m e n t r a t e f o r b o t h t h e 10 - y e a r , 2 4 - h o u r a n d 1 0 0 - y e a r , 2 4 - h o u r s t o r m s . Cr e a t e s a d d i t i o n a l c o n t r o l a g a i n s t fl o o d i n g f r o m l a r g e r a n d l e s s f r e q u e n t st o r m s . Re q u i r e s a d d i t i o n a l d e t e n t i o n v o l u m e , a n d in c r e a s e s c o m p l e x i t y f o r f a c i l i t y d e s i g n a n d op e r a t i o n . Cu r r e n t A p p r o a c h : N o n e , e x c e p t t h i s g e n e r a l st a t e m e n t , “ W h e r e t h e p o t e n t i a l f o r m a j o r pr o p e r t y d a m a g e e x i s t s d u e t o d o w n s t r e a m fl o o d i n g a n d t h e t e r r a i n a n d a v a i l a b i l i t y o f l a n d pe r m i t t h e c o n s t r u c t i o n o f a l a r g e d e t e n t i o n ba s i n , a 1 0 0 - y e a r d e s i g n f r e q u e n c y s h o u l d b e us e d f o r t h e p o n d . ” Di f f i c u l t t o d e t e r m i n e p o t e n t i a l d a m a g e , an d h i g h c o s t o f l a r g e l a n d a r e a t o b e u s e d fo r d e t e n t i o n w h i c h w o u l d b e p r i m a r i l y bo r n e b y t h e d e v e l o p e r . Ch a n n e l S t a b i l i t y / Re g i o n a l D e t e n t i o n Al t e r n a t i v e A p p r o a c h : I n a d d i t i o n t o f l o o d co n t r o l , r e q u i r e a d d i t i o n a l d e t e n t i o n v o l u m e t o li m i t r e l e a s e r a t e s t o c h a n n e l - f o r m i n g f l o w s , i n ar e a s w h e r e i t h a s b e e n i d e n t i f i e d a s a n i s s u e : Bo z e m a n C r e e k , M a n d e v i l l e C r e e k . Re d u c e s p o t e n t i a l i m p a c t s o f e r o s i o n , an d p r o v i d e s a d d i t i o n a l f l o o d pr o t e c t i o n f o r m a j o r c h a n n e l s do w n s t r e a m o f o n - s i t e f l o o d c o n t r o l (r e t e n t i o n / d e t e n t i o n ) f a c i l i t i e s . Re q u i r e s s u b s t a n t i a l i n c r e a s e s i n d e t e n t i o n vo l u m e s , s o m e t i m e s b y 2 0 0 % o r m o r e . 3- 1 0 Ch a p t e r 3 : P o l i c y E v a l u a t i o n 3-11 Ta b l e 3 . 5 - 1 S t o r m W a t e r P o l i c y C o n s i d e r a t i o n s El e m e n t A p p r o a c h Pr o s Co n s Cu r r e n t A p p r o a c h : M a i n t a i n a m i n i m u m v e l o c i t y of 3 f p s a t t h e d e s i g n s t o r m d e p t h o f f l o w . I n l e t s an d m a n h o l e s s h a l l h a v e 9 i n c h s u m p s f o r se d i m e n t c o l l e c t i o n . V e g e t a t i v e c h a n n e l s s h a l l b e ut i l i z e d w h e r e v e r p o s s i b l e t o r e m o v e w a s t e w a t e r co n t a m i n a n t s . S t o r m w a t e r s t o r a g e a n d tr e a t m e n t f a c i l i t i e s s h a l l b e d e s i g n e d t o r e m o v e so l i d s , s i l t , o i l s , g r e a s e , a n d o t h e r p o l l u t a n t s . Ve l o c i t y a n d s u m p r e q u i r e m e n t s h e l p to p r e v e n t s e d i m e n t d e p o s i t . No q u a n t i t a t i v e c r i t e r i a f o r v e g e t a t i v e ch a n n e l s , o r p o l l u t a n t r e m o v a l . Al t e r n a t i v e A p p r o a c h : R e q u i r e t r e a t m e n t o f t h e "w a t e r q u a l i t y " s t o r m . Ca n b e a r e l a t i v e l y s m a l l v o l u m e o f wa t e r a s c o m p a r e d t o v o l u m e s re q u i r e d f o r f l o o d c o n t r o l a n d c h a n n e l st a b i l i t y . Ca n b e s p e c i f i e d a s a s i m p l e “ v o l u m e pe r a c r e ” c a l c u l a t i o n w i t h a s p e c i f i e d mi n i m u m d r a i n t i m e . Ma y r e q u i r e s e p a r a t e “ w a t e r q u a l i t y ” fa c i l i t i e s i n a d d i t i o n t o f l o o d c o n t r o l (d e t e n t i o n / r e t e n t i o n ) f a c i l i t i e s , w h i c h co u l d i n c r e a s e c o n s t r u c t i o n a n d ma i n t e n a n c e c o s t s . Al t e r n a t i v e A p p r o a c h : P r o v i d e i n c e n t i v e s f o r lo w - i m p a c t d e v e l o p m e n t t e c h n i q u e s s u c h a s gr e e n s t r e e t s w a l e s , d i s c o n n e c t e d d o w n s p o u t s , po r o u s p a v e m e n t s , w e t p o n d s , a n d o t h e r fa c i l i t i e s d e s i g n e d t o p r o m o t e i n f i l t r a t i o n . De c r e a s e s t o t a l i m p e r v i o u s a r e a , re s u l t i n g i n l o w e r p e a k r u n o f f r a t e s an d l o w e r a g g r e g a t e r u n o f f v o l u m e s . No t e f f e c t i v e u n l e s s s o i l p r o p e r t i e s w i l l pr o m o t e i n f i l t r a t i o n . Re q u i r e s a h i g h e r l e v e l o f C i t y r e v i e w , a n d wo u l d r e q u i r e q u a n t i f i c a t i o n o f n e t b e n e f i t s (e . g . , r e d u c e d d e t e n t i o n r e q u i r e m e n t s ) f o r ea c h t y p e o f w a t e r q u a l i t y f a c i l i t y . Wa t e r Q u a l i t y Al t e r n a t i v e A p p r o a c h : R e q u i r e d e t e n t i o n co m b i n e d w i t h i n c e n t i v e s f o r l o w i m p a c t de v e l o p m e n t t e c h n i q u e s . Wo u l d p o t e n t i a l l y o p t i m i z e s t o r m wa t e r c o n t r o l s w i t h r e s p e c t t o b o t h ec o n o m i c a n d e n v i r o n m e n t a l b e n e f i t s . Co m p l i c a t e s t h e C i t y ' s r e v i e w a n d a p p r o v a l of p r o p o s e d s t o r m w a t e r p l a n s a n d w o u l d re q u i r e t h e d e v e l o p m e n t o f d e s i g n gu i d e l i n e s f o r l o w i m p a c t d e v e l o p m e n t . Bo z e m a n S t o r m W a t e r F a c i l i t i e s P l a n 3- 1 2 Ta b l e 3 . 5 - 1 S t o r m W a t e r P o l i c y C o n s i d e r a t i o n s El e m e n t A p p r o a c h Pr o s Co n s Cu r r e n t A p p r o a c h : R a t i o n a l M e t h o d In v o l v e s s i m p l e c o m p u t a t i o n s a n d an a l y s i s . S i m p l i f i e s C i t y r e v i e w . Th e R a t i o n a l M e t h o d i s a p e a k f l o w m o d e l an d i s n o t a n a c c u r a t e p o n d r o u t i n g me t h o d . Ac c u r a c y d e c r e a s e s f o r l a r g e d r a i n a g e ba s i n s . Al t e r n a t i v e A p p r o a c h : H y d r o g r a p h R o u t i n g Pr o v i d e s a m o r e a c c u r a t e a n a l y s i s o f de t e n t i o n p o n d i n f l o w a n d o u t f l o w hy d r o g r a p h s . In c r e a s e s t h e c o m p l e x i t y o f t h e a n a l y s i s , an d r e q u i r e s t h e u s e o f a s p r e a d s h e e t pa c k a g e o r h y d r o l o g i c m o d e l i n g s o f t w a r e . Hy d r o l o g i c a n d Hy d r a u l i c A n a l y s i s Me t h o d s Al t e r n a t i v e A p p r o a c h : C o n t i n u o u s S i m u l at i o n Wi t h p r o p e r a p p l i c a t i o n c o u l d op t i m a l l y s i z e s f a c i l i t i e s b a s e d o n ac t u a l p r e c i p i t a t i o n d a t a . Re q u i r e s s o p h i s t i c a t e d m o d e l i n g p a c k a g e s an d a s u b s t a n t i a l l y h i g h e r l e v e l o f a n a l y s i s th a n s t a t i s t i c a l ( u n i t ) h y d r o g r a p h r o u t i n g me t h o d s . I t i s d i f f i c u l t t o s t a n d a r d i z e an a l y s i s t e c h n i q u e s . Re q u i r e s l a r g e a m o u n t s o f p r e c i p i t a t i o n da t a . Wo u l d c o m p l i c a t e t h e C i t y ' s r e v i e w pr o c e s s . Cu r r e n t A p p r o a c h : T h e c u r r e n t d e s i g n p o l i c y i s in c l u d e d i n t h e C i t y o f B o z e m a n D e s i g n St a n d a r d s a n d S p e c i f i c a t i o n s P o l i c y , M a r c h 2 0 0 4 , pa g e s 2 1 - 3 0 . De s i g n P o l i c y a n d Su b m i t t a l Re q u i r e m e n t s Al t e r n a t i v e A p p r o a c h : A d d M o d i f i c a t i o n s T o Ex i s t i n g P o l i c y If f e w c h a n g e s t o e x i s t i n g p o l i c y , t h i s ap p r o a c h w o u l d b e s i m p l e r t o ad m i n i s t e r . Ma y b e m o r e c o m p l i c a t e d t o u n d e r s t a n d ex a c t l y w h i c h p o l i c i e s h a v e b e e n r e v i s e d an d w h i c h o n e s r e m a i n t h e s a m e . Ch a p t e r 3 : P o l i c y E v a l u a t i o n 3-13 Ta b l e 3 . 5 - 1 S t o r m W a t e r P o l i c y C o n s i d e r a t i o n s El e m e n t A p p r o a c h Pr o s Co n s Al t e r n a t i v e A p p r o a c h : P r e p a r e a C o m p l e t e Re v i s i o n / R e - i s s u e If n u m e r o u s c h a n g e s t o e x i s t i n g p o l i c y , th i s a p p r o a c h w o u l d b e s i m p l e r t o ad m i n i s t e r . Cu r r e n t A p p r o a c h : P u b l i c l y m a i n t a i n e d s t o r m se w e r s h a v e c e r t a i n m a t e r i a l r e q u i r e m e n t s , a n d mu s t f o l l o w M P W S c r i t e r i a . D e v e l o p e r m u s t su b m i t a m a i n t e n a n c e p l a n t h a t i n c l u d e s ; ow n e r s h i p , m a i n t e n a n c e s c h e d u l e , a n d re s p o n s i b l e p a r t y . Si m p l i f i e s C i t y r e v i e w . Cr i t e r i a a r e n o t s p e c i f i c . Al t e r n a t i v e A p p r o a c h : D e v e l o p e r C o n s t r u c t e d an d C i t y m a i n t a i n e d F a c i l i t i e s St o r m w a t e r c o n t r o l s a r e c o n s t r u c t e d as d e v e l o p m e n t o c c u r s . Ci t y c o l l e c t s c o s t s a s s o c i a t e d w i t h lo n g - t e r m o p e r a t i o n o f t h e f a c i l i t y fr o m t h e d e v e l o p e r . Th e c o s t s o f n e w s t o r m w a t e r c o n t r o l s , an d O & M c o s t s , t r i c k l e d o w n t o pu r c h a s e r s o f n e w h o m e s a n d co m m e r c i a l / i n d u s t r i a l d e v e l o p m e n t s . Li m i t s t h e s c o p e o f h y d r o l o g i c a n a l y s e s t o re l a t i v e l y l i m i t e d a r e a s . In m o s t c a s e s u p s t r e a m a n d d o w n s t r e a m im p a c t s a r e n o t a d e q u a t e l y a c c o u n t e d f o r , an d c u m u l a t i v e e f f e c t s o f n u m e r o u s s m a l l po n d s c o u l d r e d u c e o v e r a l l f l o o d c o n t r o l ef f e c t i v e n e s s i n m a j o r ( d o w n s t r e a m ) dr a i n a g e w a y s . De v e l o p e r r e s i s t a n c e t o i n c r e a s e d C i t y co s t s . Co n s t r u c t i o n a n d O& M Re s p o n s i b i l i t i e s Al t e r n a t i v e A p p r o a c h : C i t y C o n s t r u c t e d a n d Op e r a t e d ( R e g i o n a l ) F a c i l i t i e s Di r e c t s f o c u s o n t h e e n t i r e s y s t e m a n d th e i n t e r a c t i o n s b e t w e e n d e v e l o p m e n t an d u p s t r e a m / d o w n s t r e a m i m p a c t s . Po t e n t i a l p r o b l e m a r e a s c a n b e id e n t i f i e d e a r l y o n , r e s u l t i n g i n op t i m i z e d , e f f e c t i v e i n v e s t m e n t i n In v o l v e s e x t e n s i v e C i t y p l a n n i n g a n d in v o l v e m e n t . Th e C i t y w o u l d l i k e l y b e a r t h e o p e r a t i o n a l an d m a i n t e n a n c e c o s t s f o r r e g i o n a l de t e n t i o n f a c i l i t i e s . Re q u i r e s i n v e s t m e n t i n u p f r o n t r e g i o n a l Bo z e m a n S t o r m W a t e r F a c i l i t i e s P l a n 3- 1 4 Ta b l e 3 . 5 - 1 S t o r m W a t e r P o l i c y C o n s i d e r a t i o n s El e m e n t A p p r o a c h Pr o s Co n s st o r m w a t e r c o n t r o l s . I d e n t i f y i n g de t e n t i o n a r e a s p r i o r t o d e v e l o p m e n t co u l d d e c r e a s e p o t e n t i a l l a n d ac q u i s i t i o n c o s t s . st o r m w a t e r p l a n n i n g based on long-term co m p r e h e n s i v e l a n d u s e p l a n s . Re q u i r e s a s y s t e m o f g e n e r a t i n g r e v e n u e t o fu n d a n d o p e r a t e r e g i o n a l p r o j e c t s . Ma y r e q u i r e l a r g e r c o n v e y a n c e s t r u c t u r e s to c o n v e y u n d e t a i n e d p e a k r u n o f f t o t h e re g i o n a l f a c i l i t i e s . Al t e r n a t i v e A p p r o a c h : C o m b i n a t i o n o f De v e l o p e r / C i t y C o n s t r u c t e d a n d O p e r a t e d Fa c i l i t i e s Th e c o m b i n e d r e g i o n a l a n d d e v e l o p e r - ba s e d a p p r o a c h t o s t o r m w a t e r ma n a g e m e n t p r o v i d e s t h e a d v a n t a g e s of e a c h a p p r o a c h , w h i l e p o t e n t i a l l y mi n i m i z i n g p e r c a p i t a c a p i t a l a n d O& M c o s t s . Re q u i r e s a f a i r a m o u n t o f C i t y i n v o l v e m e n t th r o u g h i n v e s t m e n t i n l o n g - t e r m s t o r m wa t e r m a n a g e m e n t p l a n n i n g a n d d e t a i l e d de s i g n g u i d e l i n e s f o r d e v e l o p e r s . Re q u i r e s m a s t e r p l a n n i n g , d e s i g n a n d O& M c o s t s f o r r e g i o n a l f a c i l i t i e s , r e v i e w an d o v e r s i g h t o f d e v e l o p e r – d e s i g n e d a n d co n s t r u c t e d f a c i l i t i e s , a n d m a n a g i n g lo n g - t e r m O & M e f f o r t s . Chapter 3: Policy Evaluation 3.6 Storm Water Policy Recommendations 3.6.1 Existing Storm Water Policy Summary The City’s current storm water policy is presented in the City of Bozeman Design Standards and Specifications Policy, March 2004. For each of the following recommendations, the associated current policy language is summarized for comparison. Refer to the actual policy for details. 3.6.2 Storm Water Policy Recommendations In general, urban development impacts water quality and increases the amount of impervious surfaces, which increases storm runoff quantity and flow rates. Controlling storm water and protecting water resources is vital for flood control, maintaining fish and wildlife habitat, and human health and recreation. A storm water policy should be in place to minimize disruption of the natural hydrologic cycle to the extent possible, while efficiently managing the City’s resources (i.e., capital, land and O&M costs). This section summarizes the current and proposed storm water policy as it relates to various objectives. The following proposed policy changes are recommended in an attempt to satisfy Bozeman’s storm water management objectives, while providing a cost-effective, easily administered storm water policy. Policy recommendations for each category are general in nature. Additional detail and justification should be included before issuing any new requirements. Flood Control Current Policy • The storm water drainage plan shall be designed to limit storm water runoff from the development site to the pre-development runoff rates (for residential, commercial and industrial land uses, runoff is limited based on the 10-year design storm). • Storm sewer facilities shall be designed to handle a 25-year storm event. • The storm drainage plan shall include a description of the ultimate destination of storm water runoff from the project and an evaluation of its impact on downslope drainage facilities and water quality. • Retention ponds shall be sized based on a 10-year, 2-hour storm intensity. • Basins located in areas accessible to the public shall have a maximum water depth of 1.5 feet and a maximum basin depth of 2.5 feet. Deep basins designed only for storm water detention shall be placed in remote areas and fenced. • Where the potential for major property damage exists due to downstream flooding and the terrain and availability of land permit the construction of a large detention basin, a 100-year design frequency should be used for sizing the pond. 3-15 Bozeman Storm Water Facilities Plan • Overflows shall be provided for detention basins to prevent overtopping of dike walls. Recommended Policy • In addition to the 10-year requirement, require detention, retention or infiltration to limit the 25-year, 24-hour post-development peak runoff. The City currently requires detention/retention facilities to be designed to control the 10-year storm. However, control of the 10-year storm alone may not provide adequate flood control as the upper basin areas develop. Proposed outlet structures are shown in Appendix D-2, as Figures D2-9A (for smaller ponds) and D2-9B (for larger ponds). The outlet structures allow additional ponding depth in the 25-year storm and provide for piped conveyance of the 25-year storm runoff. The portion of 100-year peak runoff exceeding the outlet structure’s capacity would go over the emergency spillway. • Review allowable spread widths for conveyance of flood events through street sections. It is recommended that each classification of street (i.e. arterial, collector local) have an allowable spread width for the design storm. Providing one travel lane may be adequate on a local street during a 10 year event, while additional travel width should be required for an arterial street. • Allow runoff from off-site, upstream areas (i.e., “run-on”) to pass through the site “off- line” from (i.e., without entering) the ponds. This requirement would reduce the cumulative effect of several ponds. • Require analysis of 100-year, 24-hour peak runoff to address protection of existing downstream areas from significant damage and to evaluate impact to development from upstream “run-on.” This requirement will address the cumulative effects of prolonged high runoff from several detention ponds which, at a point downstream of a particular project, may result in flows exceeding ditch or storm drain system capacity. Analysis of “run-on” events should be based on future post development conditions. • Require evaluation of historic drainage patterns and require that runoff not be shifted to adjacent drainage basins. • Require a flood hazard evaluation be completed when warranted. • Require the 100-year water level to be 12 inches minimum below finished grade elevation at building perimeters, 8 inches maximum above paved surfaces, and 3 feet maximum above unpaved/landscaped areas. Allow no ponding above paved areas in a 10-year storm. • Encourage or require large ponds at the down gradient end of large developments by allowing phased pond construction and/or by limiting number of ponds per acre based on a graduated scale. • Encourage detention banks to create fewer, larger detention ponds with shared construction and O&M responsibilities, similar to a “cost share” on road construction between adjacent owners. 3-16 Chapter 3: Policy Evaluation • Encourage the use of low impact development practices. These practices will reduce peak runoff rates and cumulative runoff volumes into the City’s storm drainage system, which will help to reduce the number and severity of flooding events. Low impact development practices focus on managing rainfall and runoff at the source using a large number of runoff reduction and water quality Best Management Practices (BMPs). Examples of practices that may be effective in Bozeman are: o Plant trees in existing low spots and provide curb cuts for overflow during high runoff events. o Construct green spaces or open spaces at a lower elevation than adjacent pavement to collect storm water runoff and convey it through unpaved areas. Curb cuts or flush curbs could be used between paved and unpaved areas. Refer to Appendix D-2, Figure D2-10. o Promote sheet flow across grass or landscaped areas. o Require a fixed minimum percentage of tree cover in all landscaped areas, based on mature tree canopy size and taking into account overlap for closely planted trees. For example, 60% tree cover is required in Issaquah, WA, a fast-developing suburban area of Seattle. o Encourage or allow the use of grass swales. This allows runoff to infiltrate locally where soils are permeable. High volume flows should be channeled away. o Require organic soil amendments to encourage retention of the hydrologic benefits of native topsoils and enhance soil permeability. Develop specifications to ensure imported top soils used for landscaping are blended such that they support vegetation and provide an adequate grain size distribution for storm water infiltration. Normally, conventional site development earthwork practices remove the topsoil layer and landscape soils are not adequately prepared (LID, 2005). This activity removes critical organic material from the upper ground surface layers and reduces the tendency for storm water to infiltrate. o Encourage LEED-certified construction. The Leadership in Energy and Environmental Design (LEED) Green Building Rating System awards points for storm water runoff treatment and control. Projects which undergo LEED certification will almost assuredly be designed with best management practices from low impact development techniques. Piped Conveyance Facilities Current Policy • Storm sewer facilities shall be designed to handle a 25-year storm event. • The sewers shall be uniformly sloped to maintain a minimum velocity of 3-fts at the design storm depth of flow, or when flowing full, to prevent sediment deposits. • Pond inlet and outlet piping shall be protected and designed to prevent erosion (i.e. splash pads, rip rap, etc.). 3-17 Bozeman Storm Water Facilities Plan Recommended Policy • Current policy seems to be appropriate. Channel Stability/Regional Detention Current Policy The existing policy is a result of the above-stated flood control policy. There are no specific requirements regarding channel stability at this time. Recommended Policy • For storm water discharging into a natural channel, stream, creek or river, the velocity should be limited to below the “channel forming velocity” for the design storm. The “channel forming velocity” is generally considered the discharge that has a 50% chance of being equaled or exceeded in any given year (FHWA, 2006). Therefore, in addition to maintaining a minimum velocity in storm water pipes, the City should require that maximum velocities be limited for storm water discharges into natural streams, channels, or creeks. Velocities can be limited through energy dissipaters, wetlands or swales, pre- formed (engineered) scour holes, or a number of other methods. • Identify appropriate locations and design of regional detention facilities based upon future master planning efforts, and require cost-sharing or partial financing by property owners. The justification for regional ponds is very specific to each basin. Regional detention facilities are most appropriate in areas that are already highly developed, and have significant flooding or water quality problems. Future master plans will identify basin-specific impacts from future development, and therefore will provide justification and cost to protect each basin individually. The City may choose to implement regional detention (and/or flood and erosion control of major drainages) one basin at a time, or to spread costs by funding it as an overall program. The “one basin at a time” option can address actual problems as they develop, but has the risk of much higher land costs for regional detention sites that are identified later rather than sooner. Water Quality Current Policy • The storm water storage and treatment facilities shall be designed to remove solids, silt, oils, grease, and other pollutants. Where required, oil/water separators shall be provided in the facility design. • Inlets and manholes shall have nine-inch sumps for sediment collection unless otherwise approved by the City Engineer. • A minimum (detention) basin area of 145 square feet per 1 cfs release rate is required for sediment control. • To prevent short-circuiting, (detention) basin length shall be at least three times the width and inlet velocities should be dissipated. 3-18 Chapter 3: Policy Evaluation • Vegetative channels shall be utilized wherever possible to remove wastewater contaminants. Recommended Policy • Require a “water quality” detention volume of ¼ inch per acre of property being developed, with a minimum release time of 40 hours. Studies have shown that very small, very frequent storms result in 70 to 90 percent of cumulative annual storm runoff. Volume-based treatment criteria are simpler to implement than pond routing. Slow release assures adequate retention time for settlement of pollutants. Proposed outlet structures are shown in Appendix D-2, as Figures D2-9A (for smaller ponds) and D2-9B (for larger ponds). The outlet structures provide water storage depth for “water quality” detention storage below the 10-year detention storage, with a small orifice as a gravity outlet. The orifice is an “underflow” design that will minimize clogging from floating debris. Standing water in the pond would indicate a need for orifice and/or sump cleaning. • Encourage the use of grass swales, filter strips, small ponds, wetlands, and grassy areas. • Encourage “first flush” treatment. As described in Chapter 4, the NPDES Phase II rules require the City to consider water quality in facility design. Often, storm water jurisdictions will require separate facilities to treat the first flush of runoff resulting from lower magnitude, more frequent storm events. This allows a means of effectively designing specific storm water treatment mechanisms without requiring unnecessary volume. For example, a Stormfilter™ system by Stormwater 360, Inc. does not provide detention or retention from heavy precipitation events, but the manufacturer of this system claims that it is capable of capturing 80% of total suspended solids from first- flush storm water runoff. A proposed “first flush” treatment BMP, disconnected impervious area, is shown in Appendix D-2, Figure D2-10. Allowing runoff from impervious areas to run across vegetated or other pervious areas provides treatment through filtration and infiltration. An added benefit is reduction of overall runoff volume and peak runoff rate. • Encourage the use of infiltration galleries. Pre-manufactured underground detention facilities are becoming more common in Bozeman area developments. In appropriate soils, these facilities can be designed to double as infiltration galleries where “first flush” runoff is removed from surface runoff, and excess runoff from larger storms is “decanted” off the top of the gallery after passing through a control structure to a surface water discharge. • Monitor construction sites to assure compliance with the state’s MPDES storm water permit program and provide guidance on temporary BMPs that are most applicable to the Bozeman area. Appendix D-2 includes five commonly used temporary BMPs (Figures D2-1 through D2-5) that are commonly used and would be effective in reducing erosion and intercepting sediment on-site. 3-19 Bozeman Storm Water Facilities Plan Construction and O&M Responsibilities Current Policy Currently, most storm water facilities are operated and maintained by the land owners or property owners associations. Recommended Policy For all future development on private lands, require on-site storm water facilities to be constructed, operated and maintained by the land owners or property owners associations. The City should remain responsible for siting, designing, constructing and operating regional detention and other public drainage facilities, plus compliance monitoring of on-site (private) drainage facilities. The City’s current O & M plan, which includes inspection, should be enhanced to include long-term monitoring and construction reporting. Hydrologic and Hydraulic Analysis Methods Current Policy The Rational Method shall be used to determine peak runoff rates with a slight modification of the method to determine runoff volumes. Duration is assumed to be equal to the time of concentration. The intensity of the storm is determined from the City of Bozeman IDF curves. Recommended Policy Rational Method - Design of Conveyance Structures: Restrict the use of Rational Method-generated peak runoff estimates to drainage basins no larger than 100 acres in size. The Rational Method assumes constant rainfall intensity over the entire drainage basin. The validity of this and other Rational Method assumptions decreases as the basin size increases. Rational Method - Design of Detention Facilities: Continue to allow use of the Modified Rational Method for detention facility design within drainage basins no larger than 40 acres in size. However, encourage the use of the Unit Hydrograph Method as the preferred method for all drainage basins, including those of less than 40 acres. Although the Rational Method provides an estimate of only one point on the runoff hydrograph, it can be used to provide simplified detention routing for small sites. However, use of the Unit Hydrograph Method should be encouraged because it more accurately portrays detention pond routing for both small and large drainage basins. Perform Rational Method calculations using a City-provided spreadsheet. Use of a City-provided spreadsheet will result in a consistent output format for City review. An example of an Excel spreadsheet that could be used is included at the end of this chapter. Replace the current table of recommended Rational Method runoff coefficients. Rational Method runoff coefficients vary with different soil 3-20 Chapter 3: Policy Evaluation characteristics as well as with different land uses, Therefore, each contributing catchment area should be characterized according to a combination of land cover and hydrologic soil group, then weighted by area to find the appropriate overall (composite) runoff coefficient. The selection of runoff coefficients requires good judgment and understanding on the part of the designer; tabulated values should be used as a basis for estimating site-specific values. An example is provided below. Table 3.6- 1 Runoff Coefficients for the Rational Method HYDROLOGIC SOIL GROUP A B C D SURFACE TYPE 1 Undeveloped Surface: Pasture .12 .18 .24 .30 Meadow .10 .14 .20 .24 Forest .08 .11 .13 .16 Cultivated Land .14 .17 .20 .24 Streets/Impervious Areas: Concrete, Asphalt & Roofs .90 .90 .90 .90 Gravel .80 .80 .80 .80 Grass Lawns .15 .20 .30 .35 LAND USE 2 Business: Commercial Area .80 .82 .85 .88 Neighborhood Area .55 .60 .65 .70 Residential: Average Lot Size ≤ ½ acre .25 .35 .45 .50 Average Lot Size > ½-acre .20 .28 .35 .40 Multi-Unit (Detached) .40 .46 .55 .60 Multi-Unit (Attached) .60 .65 .70 .75 Apartments .55 .60 .65 .70 Industrial: Light Areas .60 .65 .70 .75 Heavy Areas .76 .80 .85 .88 Parks, Cemeteries: Playgrounds .20 .26 .32 .40 3-21 Bozeman Storm Water Facilities Plan 3-22 Railroad Yard Areas .25 .35 .45 .50 1 Undeveloped Surface Definition: Forest and agricultural land, open space. 2 Sources: Strom Drainage Design Manual, Erie and Niagara Counties Regional Planning Board. Unit Hydrograph Method: Require the use of a unit hydrograph routing method to size conveyance structures for all drainage basins greater than 100 acres in size, and to size detention facilities for drainage basins greater than 40 acres in size. In addition, encourage the use of this method for smaller drainage basins. A hydrograph routing method will provide more accurate results, and the rational method is generally not recommended for water storage sizing or pond routing. Perform Unit Hydrograph Method calculations using StormNET, a software program distributed by BOSS Internalional, Ltd. This program is a fully dynamic hydrology and hydraulic model that incorporates hydrologic and hydraulic design into a single model. It can run small projects simply and efficiently, as well as running large, complex projects. StormNET can run independently by building a “point-and-click” schematic model on the screen, but also has the capability to automatically construct storm drain network models from AutoCAD/LDD, Civil3D and MicroStation drawings, and GIS databases, with any desired image as a background layer. Use of a standard software program will result in a consistent report/output format, to simplify City review. When a hydrograph routing method is used, require the use of a standard City of Bozeman unit hydrograph to be generated using the Unit Hyetographs described in Chapter 2 (System Analysis). Although the SCS Type II distribution is commonly used throughout the western U.S., the distributions described in Chapter 2 (System Analysis) are more area-specific, and therefore should be a more accurate statistical representation of Bozeman area rainfall. Require storm water reports to be submitted in a standardized format. The format should include specific information and calculations that the City can easily verify and duplicate. A recommended format is included as Appendix G. Require submittal of post-construction hydrologic data and hydraulic structure data digitally, in a standardized format. Require submittal of hydrologic/hydraulic data tables in the same format as the XP SWMM program’s input tables (Appendix C), and also require submittal of as-constructed hydraulic/conveyance structure information in the same table format as the Junction and Link spreadsheets (Appendices A-1 and A-2). This requirement will simplify the incorporation of new data into the City’s database and city-wide storm water model. The files should be submitted as Excel (or similar) spreadsheets; the City could provide a blank template. City staff should compare the data tables with the drainage reports and record drawings, and should field-verify the data as time permits. CITY OF BOZEMAN - RATIONAL METHOD WORKSHEET Project Name: Date: Project No: Pond ID No. by: MODIFIED RATIONAL METHOD DATA ENTRY: Q = C i AQ = peak runoff rate (cfs)Input values to green and blue highlighted cells sequentially from top to Spreadsheet Developed by: C = runoff coefficientbottom of worksheet. Read cell notes by moving cursor over cells with i = intensity (in/hr)small red triangle in upper right-hand corner). A = area (acres) PRINTING: Set print area to ≥ 3 lines below where maximum volumes (both triangular and constant release) occur in the "10-Year Detention Volume" table. RUNOFF CALCULATIONS PRE- & POST-DEVELOPMENT RUNOFF City of Bozeman 10- year design storm Rainfall Intensity - Duration Curves i = A (Tc/60)B i =intensity (in/hr) PRE-DEVELOPMENT:Tc =time of concentration (min) Basin Area =2.62acresRecurrenceVariables Interval (yrs)AB Time of Concentration =28.0min.20.36-0.60 50.52-0.64 Composite Runoff Coefficient =0.20100.64-0.65 250.78-0.64 Intensity coeff. A =0.64500.92-0.66 Intensity coeff. B =-0.651001.01-0.67 Intensity (i) =1.05in/hr 10- yr Peak Runoff (PRE) =0.55CFS PEAK RUNOFF RESULTS RecurrancePre-DevelopmentPost-Development POST-DEVELOPMENT:Interval Intensity Peak Intensity Peak (yrs)(in/hr)Runoff (cfs)(in/hr)Runoff (cfs) Basin Area =2.62AC 2 0.57 0.30 0.77 1.39 5 0.85 0.44 1.17 2.12 Time of Concentration =16.9MIN 10 1.05 0.55 1.46 2.64 25 1.27 0.67 1.75 3.17 Composite Runoff Coefficient =0.69 50 1.52 0.80 2.12 3.84 100 1.68 0.88 2.36 4.27 Intensity (i) =1.46in/hr 10- yr Peak Runoff (POST) =2.64CFS 10-YR DETENTION VOLUME CALCULATIONSDISCHARGE STRUCTURE CALCULATIONS Duration Increment =1.00min.WATER QUALITY (WQ) CONTROL STRUCTURE (ORIFICE): 10-yr. Maximum Depth =1.5ft. Required WQ Storage Volume =2,378cu. ft. 10-YR VOLUME RESULTS:WQ Orifice Elevation =100.00 Average Volume = 10-Yr Volume =cu. ft.Max. WQ Headwater Depth =0.50ft. Horizontal Orifice: Max. Volumes (cu. ft.)Circular: Diameter =1.290in. 1,943Square: Sides =in. TriangularConstant Rectangular: Length =in. DurationIntensityQpReleaseReleaseWidth =in. (min.)(in/hr)(cfs)Pond Volume (cu. ft.)Area =1.307sq. in. 16.061.512.731,650 17.061.452.621,678 CIRCULAR ORIFICE 18.061.402.531,703 Peak Discharge Rate =0.0312cfs 19.061.352.441,727 Maximum WQ Discharge Rate =0.0315cfs 20.061.302.361,748 Acceptable Percentage Below 2,194 2,082 2,498 2,121 2,159 3,054 2,228 Page 1 of 3 CITY OF BOZEMAN - RATIONAL METHOD WORKSHEET Project Name: Date: Project No: Pond ID No. by: 21.061.262.291,768 Maximum WQ Discharge Rate =5.0% 22.061.232.221,786 Maximum WQ WSEL =100.50 10-YR DETENTION VOLUME CALCS (cont'd)DISCHARGE STRUCTURE CALCS (cont'd) Triangular Constant 10-YEAR CONTROL STRUCTURE (ORIFICE): DurationIntensityQpReleaseRelease (min.)(in/hr)(cfs)Pond Volume (cu. ft.)Horizontal Orifice: 23.061.192.151,803 Circular: Diameter =4.320in. 24.061.162.101,819 Square: Sides =in. 25.061.132.041,833 Rectangular: Length =in. 26.061.101.991,846 Width =in. 27.061.071.941,859 Area =14.657sq. in. 28.061.051.901,870 10-yr Outlet Elevation =100.50 29.061.031.851,880 Max. 10-yr Headwater Depth =1.00ft. 30.061.001.811,889 31.060.981.781,897 CIRCULAR ORIFICE 32.060.961.741,905 Peak Discharge Rate =0.494cfs 33.060.941.701,911 Allowable Discharge Rate =0.496cfs 34.060.921.671,917 Acceptable Percentage Below 35.060.911.641,923 Allowable Discharge Rate =2.0% 36.060.891.611,927 Maximum 10-yr WSEL =101.50 37.060.881.581,931 38.060.861.561,934 39.060.851.531,937 40.060.831.501,939 10-YR RISER ELEVATION (APPROXIMATE TOP OF 25-YR STORAGE): 41.060.821.481,941 42.060.811.461,942 Assumed Increase in HW Depth =0.50ft. 43.060.791.441,943 Flow Rate through WQ inlet =0.062cfs 44.060.781.411,943 Flow Rate through 10-yr inlet =0.605cfs 45.060.771.391,942 Total Flow Rate =0.668cfs 46.060.761.371,941 25-yr Peak Runoff (pre-development) =0.666cfs =Target Discharge Rate 47.060.751.351,940 Acceptable Percentage Above 48.060.741.341,939 Target Discharge Rate =1.0% 49.060.731.321,937 Min. Top of 10-yr Riser Elevation =102.00 50.060.721.301,934 51.060.711.291,931 52.060.701.271,928 53.060.691.251,925 DISCHARGE PIPE AND 10-YR RISER SIZING: 54.060.681.241,921 55.060.681.221,917 Discharge Pipe & 10-yr Riser Diameter =12.00in. 56.060.671.211,912 Pipe Length =24.00ft. 57.060.661.201,907 Approximate 25-yr Headwater Depth =1.50ft. 58.060.651.181,902 Mannings "n" =0.012 59.060.651.171,897 Entrance Loss Coefficient Ke=0.50 60.060.641.161,891 Pipe Slope =1.00% 61.060.631.141,885 25-yr Post-Development Peak Runoff =3.17cfs 62.060.631.131,879 Calculated Peak Discharge =3.71cfs 63.060.621.121,872 64.060.611.111,865 65.060.611.101,858 66.060.601.091,851 100-YEAR CONTROL STRUCTURE (SPILLWAY): 67.060.601.081,843 68.060.591.071,836 Circular Riser: Diameter =in. 69.060.581.061,828 Rectangular Weir: 70.060.581.051,819 Sharp-Crested Length =ft. 71.060.571.041,811 Broad-Crested Length =10.00ft. 72.060.571.031,802 Max. Headwater Depth =0.30ft. 73.060.561.021,793 74.060.561.011,784BROAD-CRESTED WEIR 75.060.551.001,775 Weir Crest Elevation =102.00 76.060.550.991,766 Peak Discharge =4.358cfs 77.060.540.981,756 Min. Required Discharge Rate =4.267cfs 78.060.540.981,746 Acceptable Percentage Above 79.060.530.971,736 Required Discharge Rate =5.0% 80.060.530.961,726 100-yr WSEL =102.30 81.060.530.951,716 82.060.520.941,705 83.060.520.941,694 84.060.510.931,684 85.060.510.921,673 86.060.510.921,661 87.060.500.911,650 2,291 Discharge/Riser Pipe O.K. 10-yr Riser Elevation O.K. 10-yr Control Structure O.K. 100-yr Control Structure O.K. 2,260 WQ Control Structure O.K. 2,321 2,349 2,376 2,401 2,426 2,450 2,473 2,495 2,516 2,536 2,556 2,575 2,593 2,611 2,628 2,644 2,660 2,675 2,690 2,705 2,718 2,732 2,745 2,757 2,770 2,781 2,793 2,804 2,814 2,825 2,835 2,844 2,854 2,863 2,871 2,880 2,888 2,896 2,904 2,911 2,918 2,925 2,932 2,938 2,944 2,950 2,956 2,962 2,967 2,972 2,977 2,982 2,986 2,991 2,995 2,999 3,003 3,007 3,010 3,014 3,017 3,020 3,023 3,026 3,028 Page 2 of 3 CITY OF BOZEMAN - RATIONAL METHOD WORKSHEET Project Name: Date: Project No: Pond ID No. by: 88.060.500.901,638 89.060.500.901,627 90.060.490.891,615 91.060.490.881,603 92.060.480.881,591 93.060.480.871,579 94.060.480.861,566 95.060.470.861,554 96.060.470.851,541 97.060.470.851,529 98.060.470.841,516 99.060.460.841,503 100.060.460.831,490 101.060.460.821,476 102.060.450.821,463 103.060.450.811,449 104.060.450.811,436 105.060.440.801,422 106.060.440.801,408 107.060.440.791,394 108.060.440.791,380 109.060.430.781,366 110.060.430.781,352 111.060.430.781,337 112.060.430.771,323 113.060.420.771,308 114.060.420.761,294 115.060.420.761,279 116.060.420.751,264 3,031 3,033 3,035 3,037 3,039 3,041 3,043 3,044 3,046 3,047 3,048 3,050 3,050 3,051 3,052 3,053 3,053 3,054 3,054 3,054 3,054 3,054 3,054 3,054 3,054 3,053 3,053 3,052 3,052 Page 3 of 3 Bozeman Storm Water Facilities Plan Chapter 4. National Pollutant Discharge Elimination System Phase 2 Permit Compliance Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance Table of Contents 4.1 Introduction ........................................................................................................................4-1 4.2 Water Quality Issues ..........................................................................................................4-1 4.2.1 Water Quality..................................................................................................................4-2 4.2.2 Possible Pollutant Sources............................................................................................4-4 4.3 NPDES Permit Application .............................................................................................4-5 4.3.1 Minimum Control Measures ........................................................................................4-5 4.3.2 Minimum Control Measure 1 – Public Education and Outreach on Storm Water Impacts..........................................................................................................................................4-6 4.3.3 Minimum Control Measure 2 – Public Participation and Involvement ..............4-11 4.3.4 Minimum Control Measure 3 – Illicit Discharge Detection and Elimination ....4-15 4.3.5 Minimum Control Measure 4 – Construction Site Storm Water Runoff Control..4- 21 4.3.6 Minimum Control Measure 5 – Post-Construction Storm Water Management 4-25 4.3.7 Minimum Control Measure 6 – Pollution Prevention and Good Housekeeping for Municipal Operation.................................................................................................................4-28 4.4 Reporting Requirements..................................................................................................4-31 4.4.1 Sampling ........................................................................................................................4-32 4.5 Co-Permitting....................................................................................................................4-34 4.5.1 Montana State University............................................................................................4-34 4.5.2 Montana Department of Transportation .................................................................4-35 4.5.3 Gallatin Local Water Quality District .......................................................................4-36 4.6 Summary............................................................................................................................4-37 Tables Table 4.2- 1 2006 Water Quality Information .............................................................................4-3 Table 4.2- 2Primary Pollutants of Concern in Urban Runoff...................................................4-5 Table 4.3-1 Public Outreach Activities and Targeted Audiences .............................................4-8 Table 4.3- 2 Minimum Control Measure No. 1 - Public Outreach and Education .............4-11 Table 4.3- 3 Minimum Control Measure No. 2 - Public Participation and Involvement ...4-14 Table 4.3- 4 Example Disposal Options for Non-Storm Discharges....................................4-17 Table 4.3- 5 Minimum Control Measure No. 3 - Illicit Discharge Detection and Elimination ..........................................................................................................................................................4-21 4-i Bozeman Storm Water Facilities Plan 4-ii Table 4.3- 6 Minimum Control Measure No. 4 - Construction Site Storm Water Runoff Control.............................................................................................................................................4-24 4.3-7 Minimum Control Measure No. 5 – Post Construction Storm Water Management 4-27 4.3-8 Minimum Control Measure No. 6 – Pollution Prevention and Good Housekeeping for Municipal Operation......................................................................................................................4-31 Table 4.4-1 Testing Parameters and Median Concentrations..................................................4-32 Table 4.4-2 2005 Storm Water Quality Testing .........................................................................4-33 Table 4.5-1 MSU Phase 2 Permit Activities ...............................................................................4-35 Table 4.5-2 GLWQD Phase 2 Permit Activities .......................................................................4-37 Table 4.6-1 Total Annual Cost for Permit Process...................................................................4-38 Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4.1 Introduction The Phase 2 storm water rule will have a dramatic impact on the way the City of Bozeman manages storm water. In April 2002, the City was notified it would be required to obtain a National Pollution Discharge Elimination System (NPDES) storm water permit for lawful discharge of City runoff into local waterways. As a result of these regulations, the City will be required to implement a program aimed at reducing pollutants in urban storm drainage to the maximum extent practicable. The permit is largely programmatic with the City essentially writing its own approach to meeting minimum requirements set by Montana Department of Environmental Quality (MDEQ). The MDEQ General Permit requires the City to implement a storm water program over five years that includes the following six minimum control measures: 1. Public Education and Outreach on Storm Water Impacts 2. Public Involvement/Participation 3. Illicit Discharge Detection and Elimination 4. Construction Site Storm Water Runoff Control 5. Post Construction Storm Water Management in New Development and Redevelopment 6. Pollution Prevention/Good Housekeeping for Municipal Operations The program must include the development and implementation of best management practices (BMPs) and measurable goals for each minimum control measure. The Phase 2 rule will require the City devote significant staff time to management of the storm drainage system, document its maintenance procedures, sample outfalls, and record water quality information. Additional management tasks may include construction site inspection, erosion and sedimentation control plan review, screening for illicit connections and adopting new ordinances. The following chapter describes in detail those requirements along with costs associated with compliance. The City’s permit will apply only to the area within City limits. The Phase 2 permit application was submitted in March of 2003. Because MDEQ had not yet issued its general permit at this time, the City relied on the federal regulatory language in completing the application. In November of 2004, MDEQ issued its draft general permit. The general permit included many additional requirements not described in the federal language. This chapter presents both activities included in the original permit application as well as those required by the general permit. 4.2 Water Quality Issues The main goal of the Phase 2 storm water rule is to protect and improve water quality. It requires cities to develop, implement, and enforce a management program to reduce the discharges of pollutants to the maximum extent practicable, protect water quality, and satisfy the appropriate water quality requirements of the Montana Water Quality Act. 4-1 Bozeman Storm Water Facilities Plan Water Quality 4.2.1 Storm water from the City discharges primarily into Spring Creek, Bozeman Creek, Bridger Creek and the East Gallatin River, as well as a number of smaller discharges. The East Gallatin was assessed for water quality impairment in 2005. It will likely be listed as impaired for nutrients. Since the release of this draft report, MDEQ has released the draft 2006 305(b)/303(d) list of impaired waters. The East Gallatin River is listed in four segments, each of which has its own impairment causes and beneficial use information. As shown in Table 4.2-1, probable causes of Nitrogen and Phosphorus impairment includes grazing in riparian or shoreline zones, municipal (urbanized high density area), residential districts, and yard maintenance. There are several impaired streams on MDEQ’s 303d list (shown in red) 4-2 Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4-3 Table 4.2- 1 2006 Water Quality Information Water Information Name East Gallatin River Location East Gallatin River, headwaters to Bridger Creek Basin Upper Missouri Size (Miles/Acres) 7 Ecoregion Middle Rockies County Gallatin Water Quality Category 5 – One or more uses are impaired and a TMDL is required. Beneficial Use Support Information Use Name Fully Supporting Partially Supporting Not Supporting Threatened Insufficient Information Not Assessed Agricultural X Aquatic Life X Cold Water Fishery X Drinking Water X Industrial X Primary Contact Recreation X Impairment Information Probable Causes Probable Sources Associated Uses TMDL Completed? Nitrogen (Total) Grazing in Riparian or Shoreline Zones Municipal (Urbanized High Density Area) Residential Districts Yard Maintenance Aquatic Life Cold Water Fishery No Phosphorus (Total) Grazing in Riparian or Shoreline Zones Municipal (Urbanized High Density Area) Residential Districts Yard Maintenance Aquatic Life Cold Water Fishery No The state is currently drafting a TMDL1 for the East Gallatin River; therefore, at this time, the future load allocation requirements are not known. However, other TMDLs in Montana can give some indication about potential future requirements. For example, the TMDL for Lake Helena was released in December 2005 and urban areas were listed as a potential source of impairment. Urban areas are subject to an 80% reduction for all pollutants. It should be noted that the TMDL also states, “This approach assumes that BMPs will be 1 TMDL = Total Maximum Daily Load. DEQ is required to develop Total Maximum Daily Loads (TMDL) for all water bodies on the 303(d) list. A TMDL is the total amount of a pollutant that a water body may receive from all sources without exceeding water quality standards. A TMDL can also be defined as a reduction in pollutant loading that results in meeting water quality standards. Bozeman Storm Water Facilities Plan 4-4 applied to all areas. This may not be possible or practical given constraints associated with available land area and existing infrastructure. The estimated load reductions may be an overestimate.” It is likely that the City of Bozeman will need to implement BMPs to reduce potential pollutants from urban areas. Properly designed urban Best Management Practices (BMPs), such as wet detention basins, infiltration trenches, infiltration basins, and vegetated filter strips, have exhibited removal efficiencies of 40 to 80% for total phosphorus and total nitrogen (Schueler, 1987). BMPs have been developed as part of this facility plan and are included in Appendix D. 4.2.2 Possible Pollutant Sources Since runoff quality exceeded TSS, nutrient, COD and allowed grease standards, runoff quality in Bozeman is likely impacted by a broad range of areas, including parking lots, construction sites, residential areas, streets and highways and others. Table 4.2-2 shows a matrix of types of pollutants emerging from the sources of concern in the Bozeman area. These sources will be targeted in the BMP selections described in the following sections. Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4-5 Six Minimum Control Measures: 1. Public Education and Outreach on Storm Water Impacts 2. Public Involvement/Participation 3. Illicit Discharge Detection and Elimination 4. Construction Site Storm Water Runoff Control 5. Post Construction Storm Water Management in New Development and Redevelopment 6. Pollution Prevention/Good Housekeeping for Municipal Operations Table 4.2- 2Primary Pollutants of Concern in Urban Runoff Pollutant Source/ Activity Nutrients (Nitrogen and Phosphorus) Pathogens (fecal coliform) Sediments (TSS) Oxygen- Demanding Substances (COD/BOD) Floatable (oil and grease) Restaurants X X Parking Lots X X Residential Dwellings X X X X Parks/Open Spaces X X X X X Construction Sites X X X City Shops X X Streets and Highways X X X X Golf Courses X X X Car Washes X X Commercial and Industrial Areas X X Information modified from: Model of Urban Runoff Program: State of California 4.3 NPDES Permit Application The following section describes the language in the MDEQ permit, the activities included in the May 2003 application, additional activities required to meet the new draft permit, and costs and staff hours associated with each task. 4.3.1 Minimum Control Measures The Phase 2 NPDES permit is a programmatic permit. The MDEQ permit includes language about the tasks the permittee must complete and the permittee in the application chooses how and when to meet these requirements. The main body of the permit is split into six categories, called Minimum Control Measures (MCMs). Each of these is described in detail below. Bozeman Storm Water Facilities Plan 4-6 4.3.2 Minimum Control Measure 1 – Public Education and Outreach on Storm Water Impacts The goal of this minimum control measure is to improve runoff water quality by raising public awareness. The permit language is shown in italics followed by the City’s response in standard text. The permit reads: The permittee shall document the decision process used for the development of a storm water public education and outreach program. The rationale statement must address both the overall public education program and the individual BMPs, measurable goals and responsible persons/positions for the program. The rationale statement must include the following information, at a minimum: Identify how the permittee plans to inform individuals and households about the steps they can take to reduce storm water pollution. Identify how the permittee plans to inform individuals and groups on how to become involved with the Storm Water Management Program (SWMP) (with activities such as local stream and beach restoration activities). Identify the target audiences for the education program which are likely to have significant storm water impacts (including commercial, industrial, and institutional entities) and why those target audiences were selected. Identify the target pollutant sources the public education program is designed to address. Identify the outreach strategy, including the mechanisms (e.g., printer brochures, newspapers, media, workshops, etc.) to be used to reach the target audiences, and how many people are expected to be reached by the outreach strategy over the initial five-year permit term. The water quality data indicated traditional sources (parking lots, residential dwellings, and streets), along with residential construction were likely to impact water quality. The City’s strategy to meet these requirements is to provide information to a broad range of audiences. Table 4.3-1 (Public Outreach Activities and Targeted Audiences) lists various activities and identifies their target audiences. These activities are designed to raise awareness and reduce discharge of sediments, metals, and nutrients, and include the following. • Storm Water Information Brochures • Utility Inserts • Website • Storm Drain Decal Program • Volunteer Program • Special Community Events • Teacher/Training Workshops Brochure: The Gallatin Local Water Quality Protection Department (GLWQPD) has many water quality related brochures, but none address storm water specifically. A new brochure is being developed and is nearly complete. This brochure describes the Phase 2 Program and the City’s storm water plan. The new brochure will be distributed at public presentations, at the Gallatin County Fair, the City/County building, and on the City’s website. It may be Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4-7 used as the utility bill insert as well. It is estimated that 80 hours of staff time will be needed to develop the brochure, work with a local printer, and distribute. The estimated direct cost is $5,000 initially and $2,000 per year thereafter. The brochure will be maintained throughout the permit cycle. The target audience is the general population, and it is estimated 200 people per year will be affected. Bozeman Storm Water Facilities Plan 4-8 Table 4.3-1 Public Outreach Activities and Targeted Audiences Audiences Activity/Task Re s i d e n t s So c i o e c o n o m i c Gr o u p Ch i l d r e n Bu s i n e s s In d u s t r y Co n s t r u c t i o n / N e w De v e l o p m e n t Co m m u n i t y G r o u p s Me d i a ( P S A s ) Mu n i c i p a l P e r s o n n e l Of f i c i a l s / R e g u l a t o r s All i e d O r g a n i z a t i o n s COMMUNITY OUTREACH Storm Water Information Brochures X X X X X X X X X X X Interactive Model X X X X X X Fact Sheets X X X X X X X X Tip Sheets X X X Utility Inserts X X Door Hangers X X Direct Mail Campaign X X Newsletter X X Educational Video X X X X X X X X X Interested Parties Database X X X X X X X X X Website X X X X Community Grant Program X X X X Storm Drain Decals Program X X X X X X X X X X X VIP Breakfast and Tour X X X X Amateur Photo Contest X X X X Speakers Bureau: Community Group Focus X Volunteer Program X X X Best (No) Pest Gardening Contest X X X Special Community Events X X X X Celebrity Spokespersons X X CHILDERN'S OUTREACH Coloring Books/Poster Contest X Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4-9 Table 4.3-1 Public Outreach Activities and Targeted Audiences Audiences Activity/Task Re s i d e n t s So c i o e c o n o m i c Gr o u p Ch i l d r e n Bu s i n e s s In d u s t r y Co n s t r u c t i o n / N e w De v e l o p m e n t Co m m u n i t y G r o u p s Me d i a ( P S A s ) Mu n i c i p a l P e r s o n n e l Of f i c i a l s / R e g u l a t o r s All i e d O r g a n i z a t i o n s Restaurant Table Mats X X Children's Television Club X X Teacher Training/Workshops X Science Fairs/Projects X X Calendars X Field Trips X OUTREACH TO POLITICAL OFFICALS/REGULATORS City Council Presentations X Presentations to Regulators X OUTREACH TO MUNICIPAL PERSONNEL Educational Workshops for Municipal Personal X COORDINATION WITH ALLIED ORGANIZATIONS Coordinate with NPDES Permittees X Coordinate with Regional Organizations X Website: Information regarding the Storm Water Management Program has been prepared, and can be viewed on the City of Bozeman’s existing website. This information will be updated annually by the Engineering Department to increase awareness, understanding, and support about the impacts of storm water discharges on local water bodies. A web link to the Montana State University (MSU) Extension Service catalog will also be placed on the City of Bozeman’s storm water website. The catalog provides a list of practical and useful publications and videos available from the MSU Extension Office pertaining to: guidelines and water quality impacts of the use of fertilizers and pesticides; correcting environmental hazards; preventing pollution from storm water runoff; water quality BMPs; control of road dust; and dealing with used motor oil and other auto wastes. Bozeman Storm Water Facilities Plan It is estimated that 80 hours of staff time will be required to develop the information and post on the website, and the site may reach 100 people. The website will be maintained throughout the permit cycle. Utility Bill Insert: Information about the Phase 2 program and Storm Water Management Plan will be included in utility bills to raise support for storm water management and to create support for funding storm water activities. The first year, the insert will be the brochure described above. The remainder of the permit cycle may use other material, as appropriate. The staff time associated with this task is 80 hours per year. The estimated direct cost is $3,000. It is anticipated to reach 8,500 utility bill customers. Presentations: The City will develop a short presentation appropriate for school age children on the impacts of storm water on water quality. The estimated staff time for this task is 40 hours per year. The target audience is children and active community members. Approximately 100 children per year will be affected. Display Booth: The Gallatin Local Water Quality District (GLWQD) currently sets-up an educational and information display booth at the Gallatin County Fair containing brochures/fact sheets on water quality and household hazardous waste. Information regarding Phase 2 and the City’s Storm Water Management Program will be added to this educational display booth by the Engineering Department. The estimated staff time to add information to the display is 16 hours per year. The target audience is the general public. Approximately 500 people are expected to view the display annually. The permit requires identification of who is responsible for implementation and description of how success will be measured. The City is responsible for the overall management and implementation of the program, except for the booths at the Gallatin County Fair, which will be managed by the GLWQD. The success of this minimum control measure will be evaluated by completion of the measurable goals in Table 4.3-2. The estimated cost for this control measure is shown in Table 4.3-2. The total is approximately $64,000, and about 1,400 hours over 5 years (280 hours per year). 4-10 Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4-11 Table 4.3- 2 Minimum Control Measure No. 1 - Public Outreach and Education Year Total Measurable Goal Primary Responsible Entity 1 2 3 4 5 Hours 80 80 80 80 80 400 Brochure: will be developed by December 2006 and utilized annually. COB Direct Cost* $5,000 $2,000 $2,000 $2,000 $2,000 $13,000 Hours 80 80 80 80 80 100 Website: Storm water information will be contained on the City of Bozeman’s website and reviewed annually, by December 2006. COB Direct Cost $0 $0 $0 $0 $0 $0 Hours 80 80 80 80 80 400 Utility Bill Insert: distributed once per year, by Dec. 2006. COB Direct Cost $3,000 $0 $0 $0 $0 $0 Hours 0 40 40 40 40 160 Presentations: Three presentations will be conducted at clubs/schools annually, starting in December 2006. COB Direct Cost $0 $0 $0 $0 $0 $0 Hours 0 16 16 16 16 64 Display Booth: An educational display booth will be set up at the Gallatin County Fair annually, starting in December 2006. GLWQD/ COB Direct Cost $0 $0 $0 $0 $0 $0 Total Estimated Staff Hours for MCM No. 1 240 296 296 296 296 1424 Total Estimated Staff Cost for MCM No. 1 $6,000 $7,400 $7,400 $7,400 $7,400 $35,600 Total Estimated Direct Cost for MCM No. 1 $8,000 $5,000 $5,000 $5,000 $5,000 $28,000 Total Estimated Cost for MCM No. 1 $14,000 $12,400 $12,400 $12,400 $12,400 $63,600 COB = City of Bozeman MCM = Minimum Control Measure GLWQD =Gallatin Local Water Quality District *Direct costs are exclusive of hours, and include material costs such as printing, presentation material, production cost for stencils, etc. 4.3.3 Minimum Control Measure 2 – Public Participation and Involvement The drivers for this minimum control measure are very similar to the drivers for Public Outreach and Education: raise public awareness of the storm water system so the public understands and supports the City storm water program. The permit reads: Bozeman Storm Water Facilities Plan The permittee shall document the decision process for the development of a storm water public involvement/participation program. The rationale statement must address both the overall public involvement/participation program and the individual BMPs, measurable goals, and responsible persons/positions for this program. The rationale statement must include the following information, at a minimum: Identify how the public was involved in the development and submittal of the permit application and the SWMP. Identity plans to actively involve the public in the development and implementation of the SWMP. Identify the target audiences for the public involvement program, including a description of the types of ethnic and economic groups engaged. The permittee is encouraged to actively involve all potentially affected stakeholder groups, including commercial and industrial businesses, trade associations, environmental groups, homeowners associations, and educational organizations, among others. Identify the types of public involvement activities included in this program. Where appropriate, consider the following types of public involvement activities: o Citizen Representatives on a storm water management panel; o Public hearings; o Working with citizen volunteers willing to educate others about the program; and o Volunteer monitoring or stream/beach clean-up activities. The City agreed to utilize three public involvement activities, including workshops with the City commission and the development of a storm drain decal program. The City currently operates a Clean Up Day run by the Bozeman Beautification Advisory Board. Workshop: One workshop will be conducted during a City Commission meeting by the Engineering Department to provide information and annual updates regarding Phase 2 and the City’s Storm Water Management Program to increase awareness, understanding and support of the program. Public input and discussion regarding the City’s Storm Water Management Program, including best management practices, will be encouraged. The estimated annual staff time associated with this activity is 16 hours per year. Decal Plan: A Storm Drain Stenciling Program was conducted on City of Bozeman storm drains in 1996 by The Montana Watercourse, a public service organization based at Montana State University. The program was entitled, “We All Live Downstream.” Under this program a logo was sprayed in blue paint on the sidewalk adjacent to storm sewer inlets. Public service announcements and articles were distributed to various media sources to promote the program and increase awareness. The 1996 Storm Drain Stenciling Program will most likely not be continued. Instead, Storm Drain Decals will be used. An excess of 500 “Drains to Bozeman Creek” decals as well as others have been ordered. The 1996 Storm Drain Stenciling Program will be reviewed and a plan prepared to conduct a similar Storm Drain Decal Program by the Engineering Department, with assistance from the GLWQD. The plan will identify volunteer groups, schools, and universities interested in assisting in the program, a tentative program schedule, methods of advertising the program, and the proposed number of storm drains to be decaled. The plan will be prepared in Year 3 of the permit cycle. Approximately 80 hours is budgeted for this task. 4-12 Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4-13 Decal Brochure: A Storm Drain Decal Program brochure will be developed by the Engineering Department, and reviewed by the GLWQD, to increase awareness and support for the Storm Drain Decal Program. The brochure will be developed in Year 4 to help support the program. Approximately 40 hours are budgeted to develop this brochure. Decal Program: The Storm Drain Decal Program will be conducted in Year 4 by the Engineering Department, with assistance from the GLWQD and local volunteers, in accordance with the Storm Drain Decal Program Plan. The program will be conducted in Year 4. An estimated 80 hours of staff time will be required for managing and conducting the program. The Decals will cost $5 each, resulting in a total cost of $2,500 for 500 Decals. Clean-Up Day: The Bozeman Beautification Advisory currently conducts a clean-up day using community volunteers. MSU campus cleanup participates as a part of this program. The program is conducted once per year in late spring. The clean-up consists of removing any garbage found in and along waterways, streets, parking lots, open spaces, and park facilities on campus. Material picked up during the clean- up is placed in garbage bags and picked up by the ground crews. Garbage is taken to a landfill for disposal. Minimal City staff time will be required for handling of the activity entry into the permit annual report. The City’s Engineering Department will head up the public meetings and will collaborate with the GLWQD for the decal program. The Bozeman Beautification Advisory will continue to take responsibility for the community clean-up program. The success of this minimum control measure will be evaluated by completion of the measurable goals summarized in Table 4.3-3. The cost of this measure is about $8,000, and 300 hours over 5 years (80 hours per year), detailed in Table 4.3-3. Bozeman Storm Water Facilities Plan Table 4.3- 3 Minimum Control Measure No. 2 - Public Participation and Involvement Year Total Measurable Goal Primary Responsible Entity Assistant Responsible Entity 1 2 3 4 5 Hours 16 16 16 16 16 80 Workshop: A storm water workshop will be conducted at a City Commission Meeting, annually, starting in December 2006. COB --- Direct Cost* $0 $0 $0 $0 $0 $0 Hours 0 0 80 0 0 80 Decal Plan: A Storm Drain Decal Program Plan will be prepared by December 2007. COB GLWQD Direct Cost $0 $0 $0 $0 $0 $0 Hours 0 0 0 40 0 40 Decal Brochure: A Storm Drain Decal Program Brochure will be developed and utilized by December 2008. COB GLWQD Direct Cost $0 $0 $0 $500 $0 $500 Hours 0 0 0 80 0 80 Decal Program: A Storm Drain Decal Program will be conducted by December 2009. COB MSU Direct Cost $0 $0 $0 $2,600 $0 $2,600 Hours 4 4 4 4 4 20 Clean-Up Day: The Bozeman Beautification Advisory will Continue to conduct community cleanup day per year using community volunteers. GLWQD/ COB --- Direct Cost $0 $0 $0 $0 $0 $0 Total Estimated Staff Hours for MCM No. 2 20 20 100 140 20 300 Total Estimated Staff Cost for MCM No. 2 $500 $500 $2,500 $3,500 $500 $7,500 Total Estimated Direct Costs for MCM No. 2 $ - $ - $ - $3,100 $ - $3,100 Total Estimated Cost of MCM No. 2 $500 $500 $2,500 $6,600 $500 $10,600 COB = City of Bozeman MCM = Minimum Control Measure MSU = Montana State University GLWQD = Gallatin Local Water Quality District *Direct costs are exclusive of hours, and include material costs such as printing, presentation material, production cost for stencils, etc. 4-14 Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4-15 4.3.4 Minimum Control Measure 3 – Illicit Discharge Detection and Elimination The goal of this minimum control measure is to eliminate illicit discharges to the storm water system. An illicit connection is “a point source discharge of pollutants to separate storm drain systems which is not composed entirely of storm water and not authorized by an NPDES permit.” Examples of illicit discharges are: effluent from septic tanks, sanitary wastewater, improper oil disposal, radiator flushing disposal, and improper disposal of hazardous materials. Permit text, shown in italics, reads as follows: The permittee shall document the decision process used for the development of a storm water illicit discharge detection and elimination program. The rationale statement must address both the overall illicit discharge detection and elimination program and the individual BMPs, measurable goals, and responsible persons/positions for this program. The rationale statement must include the following information, at a minimum: Identify how a storm sewer map showing the location of all outfalls and the names and location of all receiving waters was developed. Describe the sources of information used for the maps, and how verifying the outfall locations with field surveys are planned. If the map is already completed, describe how this completed map was developed. Also, describe how the map will be regularly updated. Completion of this master plan included a significant mapping task. The estimated cost of the mapping, system modeling, and preparation of the permit application for this Facilities Plan is $180,000. Map Updates: The City’s storm drain map is being developed in an ongoing process. As new facilities are constructed, they will be integrated into the City GIS system. As part of this master planning effort, the City recently completed the process of entering spatial information from the storm water network into the GIS system. Vertical data was collected with GPS in one pilot basin. The pilot basin is described in more detail in Chapter 2 (System Analysis). Annually, the City will select an area in which to collect more detailed data. An estimated 200 hours of staff time per year will be directed to this task. Identify the mechanism (ordinance or other regulatory mechanism) which will be used to effectively prohibit illicit discharges into the MS4 [Municipal Separate Storm Sewer System] and why that mechanism was chosen. If this mechanism needs to be developed, describe the plan and a schedule to do so. If an ordinance or regulatory mechanism is already developed, include a copy of the relevant sections with the program. Identify the plan, to ensure through appropriate enforcement procedures and actions, by which the illicit discharge ordinance (or other regulatory mechanism) will be implemented. The City of Bozeman has an illicit discharge ordinance currently in place for Bozeman Creek. The existing ordinance reads as follows: Dumping items into channel or polluting creek is prohibited. No person, firm, corporation, or association, nor any employee or agent of any person, firm, corporation or association, shall throw, conduct, convey or deposit or cause to be thrown, conducted, conveyed or deposited into the channel of Bozeman Creek in its course through the corporate limits of the city, or any part thereof, any paper, offal, rubbish, rags, filth, manure, hay, straw, tin cans, hides, dead animals, or anything whatever causing or tending to cause an obstruction or pollution of Bozeman Creek within the corporate limits of the City. Bozeman Storm Water Facilities Plan 4-16 The language in the rule requires the City to prohibit non-storm water discharges along with implementing enforcement actions. For example, a large dump of sediment may not be deemed pollution, but is a non-storm water discharge and would have an adverse impact on water quality. It would be beneficial to change the language to “non-storm water discharge” and more clearly delineate permissible and non-permissible discharges. In addition, the existing ordinance does not identify specific enforcement procedures and actions as required by the permit. NPDES Materials includes a model illicit discharge ordinance developed by the EPA. Table 4.3-4 shows how Phase 1 municipalities have handled a variety of non-storm discharges. The City already uses most of the preferred disposal options. No major operational changes are needed. The City can use this table and the model ordinance in drafting a modification to the storm water ordinance to determine which discharges to allow unconditionally, which to ban, and which to control. The model ordinance in Appendix F (NPDES Materials) is more detailed than the City’s existing ordinance. It includes the following elements: • Lists permissible discharges • Specifically prohibits illicit connections • Allows the City to suspend access to the City storm water system in emergencies • Allows City access to private facilities to investigate illegal spills • Requires implementation of BMPs • Requires discharger to notify City of spills • Specifies enforcement procedures In the permit application, a phased approach is proposed. In Year 3, a draft ordinance will be prepared and by Year 5 the ordinance will be passed and in place. There are 120 staff hours budgeted for this task. Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance Table 4.3- 4 Example Disposal Options for Non-Storm Discharges Preferred Disposal Options Type of Discharge When is the Discharge to the Storm Sewer Permissible? Storm Drain Sanitary Sewer Recycle/ Reuse Hazardous Waste or Other Disposal Residential lawn irrigation Always X Dumping of oil, anti-freeze, paint, cleaning fluids Never X X Residential car washing Always, but not recommended X Commercial car wash Never X X Industrial dischargers (excluding cooling water) Never X X X When above pretreatment limits Swimming pool water Only when dechlorinated X X Water line flushing Anytime after initial flush X X Fire fighting flows Emergency only X X When heavily contaminated Potable water sources Always X X Uncontaminated foundation drains Always X X Contaminated foundation drains Never X X Pumped groundwater for cleanup operations Only if in compliance with NPDES permit NPDES permit required X Cooling water Never unless no chemicals added and has NPDES permit Permit required X X 4-17 Bozeman Storm Water Facilities Plan 4-18 Table 4.3- 4 Example Disposal Options for Non-Storm Discharges Preferred Disposal Options Type of Discharge When is the Discharge to the Storm Sewer Permissible? Storm Drain Sanitary Sewer Recycle/ Reuse Hazardous Waste or Other Disposal Roof drains Always permissible except when contaminated or drains industrial area, although discharge to the ground surface where feasible is encouraged X Air conditioner condensate Always X X Wash waters from commercial/industrial facilities Never X Uncontaminated groundwater infiltration Always X X Contaminated groundwater infiltration Only if in compliance with NPDES permit NPDES permit required X Identify the plan to detect and address illicit discharges to the system, including discharges from illegal dumping and spills. This plan must include dry weather field screening for non-storm water flows and field tests of selected chemical parameters as indicators of discharge sources. Field Screening: The City will conduct dry weather field screening of all of its receiving waters over the 5-year permit cycle. The field screening would consist of two City staff walking the stream or ditch banks probing for illicit sources. Guidance on how to conduct the screening and any associated sampling is included in Appendix J. The screening will be conducted (June, July, and/or August). It is estimated that approximately 80 hours of staff field time will be required and an additional 40 hours of office time to document and plan, and an additional 40 hours of GIS time to map any additional features or discharges located. Approximately $1,500 in direct costs would be required to provide test kits, cameras, gloves, GPS equipment, waders, etc. The plan must also address on-site sewage disposal systems that flow into the storm drainage system. Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance If septic discharges are found in the dry weather file screening process, a homeowner inquiry will be conducted as well as an inspection, if needed. No hours or costs have been included for this task, because it may not be needed. The description must address the following, at a minimum; Procedures for locating priority areas which include areas with higher likelihood of illicit connections (e.g., areas with older sanitary sewer lines, for example) and/or ambient sampling to locate impacted reaches. Areas will be prioritized by using the following: • Past complaints • Poor, dry weather water quality (as indicated by sampling data) • Outfall density • Age of development (Described in Chapter 1 Existing System Inventory) • Failing sewers (Described in the Wastewater Facility Plan) • Aging septic systems In addition, past water quality data will be used to determine priority areas. Procedures for tracing the source of an illicit discharge, including the specific techniques the permittee will use to detect the location of the source. If an illicit discharge is found in the field screening process, the City will use one of two main methods to trace an illicit discharge to its source: • Storm Drain Network Investigation – Strategically inspect manholes, by following the discharge up, to isolate the discharge between the two manholes to then conduct an on- site investigation. • On-site Investigation – Dye-, smoke-, or video-testing of a line may be used to find a source. Procedures for removing the source of the illicit discharge. Once a source has been identified, the City will need to determine who is responsible and the best methods to fix it. Method decisions will be made on a case-by-case basis. The authority and responsibility for correction and enforcement will be clearly defined in the ordinance. Procedures for program evaluation and assessment. The success of the program will be judged by the amount of dry weather field screening that is completed each year. All water bodies within the City limits with storm drain discharges will be screened in the 5-year cycle. Identify the plan to inform public employees, businesses, and the general public of hazards associated with illegal discharges and improper disposal of waste. Include in this description how this plan will coordinate with the public education minimum control measure and the pollution prevention/good housekeeping minimum control measure programs. 4-19 Bozeman Storm Water Facilities Plan 4-20 The plan to inform public employees, businesses and general public of the hazards associated with illegal discharges, etc. is included in the public outreach and education section and the pollution prevention/good housekeeping section. Identify who is responsible for overall management and implementation of the storm water illicit discharge detection and elimination program and, if different, who is responsible for each of the BMPs identified for this program. The City Engineering Department will be responsible for overall program management. Identify how the success of this minimum control measure will be evaluated, including how the measurable goals for each of the BMPs were selected. The success of this MCM will be measured by the completion of the measurable goals summarized in Table 4.3.-5 Costs and hours for this measure are shown in Table 4.3-5; there is a cost of about $250,000 and approximately 2,400 hours over 5 years Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4-21 Table 4.3- 5 Minimum Control Measure No. 3 - Illicit Discharge Detection and Elimination Year Total Measurable Goal Primary Responsible Entity Assistant Responsible Entity 1 2 3 4 5 Hours 200 200 200 200 200 1000 Map Update: The existing map dataset will be updated and revised to include more detailed and more accurate information by December of each year. COB --- Direct Cost* $200 $200 $200 $200 $200 $1,000 Hours 100 0 0 0 0 100 Plan Update: The existing Storm Sewer Master Plan will be updated by December 2006. COB --- Direct Cost $180,000 $0 $0 $0 $0 $180,000 Hours 0 0 120 0 0 120 Illicit Discharge Ordinance: will be prepared for review and adoption by the City of Bozeman Commission by December of 2008. COB --- Direct Cost $0 $0 $0 $0 $0 $0 Hours 160 160 160 160 160 800 Field Screening: Conduct field screening within the City limits of all the City’s receiving waters, by the end of the permit cycle in December of 2009. COB --- Direct Cost $1,500 $500 $500 $500 $500 $3,500 Total Estimated Staff Hours for MCM No. 3 460 360 480 360 360 2,020 Total Estimated Staff Cost for MCM No. 3 $11,500 $9,000 $12,000 $9,000 $9,000 $50,500 Total Estimated Direct Cost for MCM No. 3 $201,500 $500 $500 $500 $500 $203,500 Total Estimated Cost for MCM No. 3 $213,000 $9,500 $12,500 $9,500 $9,500 $254,000 COB = City of Bozeman MCM = Minimum Control Measure *Direct costs are exclusive of hours, and include material costs such as printing, presentation material, production cost for stencils, etc. 4.3.5 Minimum Control Measure 4 – Construction Site Storm Water Runoff Control This minimum control measure is targeted at reducing runoff from construction sites. The City of Bozeman continues to grow rapidly and construction is ongoing at a significant level. Therefore, this minimum control measure is especially important in the City’s program. The following section shows the permit language in italics followed by text describing how the City plans to meet each requirement. Bozeman Storm Water Facilities Plan 4-22 The permittee shall document the decision process used for the development of a construction site storm water control program. The rationale statement must address both the overall construction site storm water control program, and the individual BMPs, measurable goals, and responsible persons/positions for the program. The rationale statement must include the following information, at a minimum: Identify the mechanism (ordinance or other regulatory mechanism) which will be used to require erosion and sediment controls at construction sites and why this mechanism was chosen. If this mechanism needs to be developed, describe the plan and a schedule to do so. If the ordinance or regulatory mechanism is already developed, include a copy of the relevant sections with the SWMP description. The City of Bozeman will rely on the MDEQ’s general permit2 for approval and review of erosion and sedimentation control requirements for construction activities; this general permit was approved by the EPA to be in conformance with NPDES requirements. Developers are required to obtain permit coverage from MDEQ under Chapter 18.78.020 of the unified development ordinance. The MDEQ permitting process is designed to ensure proper erosion and sedimentation control requirements are met to protect water quality. Applicants are required to submit storm water pollution prevention plans (SWPPPs) that are individually reviewed and approved by MDEQ. Since its inception in June 2002, this process has proven effective in ensuring proper erosion and sedimentation control in the City. BMP Manual: In addition, in Appendix D the City has developed a manual of preferred BMPs for erosion and sedimentation control. The manual will be available on the City website and hard copies will be available at the Engineering Department. Developers will be encouraged to use these BMPs in their submittals to MDEQ. Identify the plan to ensure compliance with the erosion and sediment control regulatory mechanism, including the sanctions and enforcement mechanisms to be used to ensure compliance. Describe the procedures for when certain sanctions will be used. Possible sanctions include non-monetary penalties (such as stop work orders), fines, bonding requirements, and/or permit denials for non-compliance. MDEQ Compliance: To ensure compliance with this mechanism, the City should require documentation of an approved MDEQ construction permit before notice to proceed is given for a project. Detailed sanctions for non-compliance with the MDEQ permit include: “Any person who violates any condition of this General Permit is subject to a civil penalty not to exceed $25,000 per day per violation, or an administrative penalty not to exceed $10,000 per day per violation.” The City will notify MDEQ if it becomes aware of a violation. MDEQ will determine appropriate action. Identify the requirements for construction site operators to implement appropriate erosion and sediment control BMPs and control waste at construction sites that may cause adverse impacts to water quality. Such waste includes, but is not limited to, discarded building materials, concrete truck washouts, chemicals, litter, and sanitary waste. 2MDEQ Authorization to Discharge Under the Montana Pollutant Discharge Elimination System - General Permit for Storm water Discharges Associated with Construction Activity Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance The requirements for construction site operators to implement erosion and sedimentation BMPs are described in MDEQ’s general permit2. In the permit application, site operators must describe the BMPs chosen, including where construction waste products are stored. The permit requires site operators to remove significant sediment from the site. Identify the procedures for site plan review, including the review of pre-construction site plans, which incorporate considerations of potential water quality impacts. Describe procedures and the rationale for how certain sites for site plan review will be determined, if not all plans are to be reviewed. Describe the estimated number and percentage of sites which will have pre-construction site plans reviewed. MDEQ has indicated that reliance on the State-administer construction site permit program is not an acceptable way to meet the intent of this regulation. Our alternative approach would be to implement a local, City-administered storm water management permit. The City of Kalispell has taken on a city-administered storm water permit program. The program included all construction sites within city limits, including those with under one acre of disturbance. Permit fees are modest ($10.00 for less than an acre, $45.00 for greater than an acre) and submittal requirements are very simple for small disturbances. (Hand drawn sketches are acceptable). For larger developments, more traditional SWPPP requirements apply. It is estimated that administering a program like this in Bozeman would likely take one full time employee. Details on the Kalispell program are included in Appendix K. Larger sites and sites in close proximity to surface water will be given priority for review. Identify the procedures for receipt and consideration of information submitted by the public. Consider coordinating this requirement with the public education program. Site Inspections: Construction related complaints are directed to the City Engineering Department. The Department will review the complaint, conduct a site visit and take appropriate action as needed. Identify procedures for site inspection and enforcement of control measures, including how sites for inspection will be prioritized. Having a permitting program like the one described above would provide a basis for performing site inspections. In addition to the routine observations of all sites and inspections especially after a storm event of storm water pollution prevention plans in response to observed problems, the City will conduct inspections for water quality concerns in response to any citizen’s complaint. It is estimated that this task would require 400 staff hours a year but could be covered by the one full-time employee hired to administer the permit program. If the City chose to implement a local storm water management permit, the permit map and BMP descriptions would be reviewed as part of the inspection. Enforcement measures would be set in a new city ordinance. Identify who is responsible for overall management and implementation of the construction site storm water control program and, if different, who is responsible for each of the BMPs identified for this program. The City Engineering Department is responsible for implementation of this control measure. Identify how the success of this minimum control measure will be evaluated, including how the measurable goals for each of the BMPs were selected. If the City moves forward with its own permit and inspection program, success would be measured by the number of violations reported in response to inspection and the public 4-23 Bozeman Storm Water Facilities Plan reception of the City permit program. In addition, the City should determine a goal for a ‘low’ percentage of violations or complaints. Annual costs are shown in Table 4.3-6. Table 4.3- 6 Minimum Control Measure No. 4 - Construction Site Storm Water Runoff Control Year Total Measurable Goal Primary Responsible Entity Assistant Responsible Entity 1 2 3 4 5 Hours 40 40 40 40 40 200 MDEQ Compliance: Ensure Site Operators Obtain MDEQ Construction Site Permit Coverage, ongoing. COB --- Direct Cost* $0 $0 $0 $0 $0 $0 Hours 40 40 40 40 40 200 Site Inspections: Perform in Response to Complaints from the Public, ongoing. COB --- Direct Cost $0 $0 $0 $0 $0 $0 Hours 4 4 4 4 4 20 BMP Manual: Prepare BMP Manual by December of 2006. COB --- Direct Cost $20,000 $0 $0 $0 $0 $20,000 Hours 1 Continue to provide or contract for construction site inspection services for all City-owned infrastructures, ongoing. COB --- Direct Cost 1 Hours 2080 2080 4160 Administer storm water management permit and perform construction inspections. COB Direct Cost $50,000 $50,000 $100,000 Total Estimated Staff Hours for MCM No. 4 84 84 84 2,164 2,164 4,580 Total Estimated Staff Cost for MCM No. 4 $2,100 $2,100 $2,100 $2,100 $2,100 $10,500 Total Estimated Direct Cost for MCM No. 4 $20,000 $0 $0 $50,000 $50,000 $120,000 Total Estimated Cost for MCM No. 4 $22,100 $2,100 $2,100 $52,000 $52,000 $130,500 COB = City of Bozeman MCM – Minimum Control Measure 1No additional hours above current practices has been added for this activity. *Direct costs are exclusive of hours, and include material costs such as printing, presentation material, production cost for stencils, etc. **not in current application 4-24 Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4-25 4.3.6 Minimum Control Measure 5 – Post-Construction Storm Water Management The goal of this minimum control measure is to develop strategies for planning, design and construction of development to reduce pollutant loads and storm flows after construction is complete. As the City of Bozeman continues to develop, impervious surfaces will continue to replace pervious surfaces. However, regulations are in place that limit runoff from developments to pre-development rates. The text following shows the permit language in italics followed by text describing how the City will meet each requirement. The permittee shall document the decision process used for the development of a post-construction storm water program. The rationale statement must address both the overall post-construction storm water program and the individual BMPs, measurable goals, and responsible persons/positions for the program. The rationale statement must include the following information, at a minimum: Identify how the program to address storm water runoff from new development and redevelopment projects was developed. Include in this description any specific priority areas for this program. Storm water runoff from new development is currently designed and planned as described in the Unified Development Ordinance (UDO). Chapter 5 (Recommended Plan) describes proposed modifications to the City’s existing design approach. Identify how the program will be specifically tailored to the local community, to minimize water quality impacts, and to attempt to maintain pre-development runoff conditions. A BMP manual will be developed in conjunction with this Plan. The manual will include BMPs that are appropriate for cold weather climates and are designed to improve runoff water quality. In addition, the manual will contain BMPs relative to the retention/detention regulations that were specifically tailored to the Bozeman community. Identify any non-structural BMPs in the program, including, as appropriate: Policies and ordinances that provide requirements and standards to direct growth to identified areas, protect sensitive areas such as wetlands and riparian areas, maintain and/or increase open space (including a dedicated funding source for open space acquisition), provide buffers along sensitive waterbodies, minimize impervious surfaces, and minimize disturbance of soils and vegetation; Policies or ordinances that encourage infill development in higher density urban areas, and areas with existing storm sewer infrastructure; Education programs for developers and the public about project designs that minimize water quality impacts; and Other measures such as minimization of the percentage of impervious area after development, use of measures to minimize directly-connected impervious areas, and source control measures often thought of as good housekeeping, preventive maintenance, and spill prevention. Protection of Sensitive Areas: The City’s 2020 Plan provided zoning and guidance to direct ongoing growth in Bozeman, encouraging higher densities where appropriate. Sensitive areas and wetlands were identified. In 2000, Gallatin County passed a $10 million open space bond. In addition, as developments are brought to the development review board, opportunities for green space are discussed. For subdivision, the City requires 0.03 acres of parkland and 150 SF of open space per dwelling unit. In addition, larger development projects are encouraged to provide open space through an incentive system. Bozeman Storm Water Facilities Plan The City of Bozeman has established unique setbacks for watercourses in Gallatin County. For the East Gallatin, the minimum setback is 100 feet from the ordinary high water mark (OHW). For Sourdough, Bozeman and Bridger Creeks, the minimum setback is 75 feet from the OHW. For all other watercourses, there is a minimum 50 feet setback from the OHW. However, if any delineated 100-year floodplain is larger than the setbacks, the setbacks shall extend to the edge of the floodplain. Planting plans are required in riparian areas to further enhance water quality. Wetland setbacks are outlined in detail in the UDO. Identify any structural BMPs in the program, including, as appropriate: Storage practices such as wet ponds and extended-detention outlet structures; Filtration practices such as grassed swales, bioretention cells, sand filters and filter strips; and Infiltration practices such as infiltration basins and infiltration trenches. The City’s BMP manual will identify appropriate long term BMPs for Bozeman, including storage, filtration and infiltration. Identify the mechanisms (ordinance or other regulatory mechanisms) which will be used to address post- construction runoff from new developments and redevelopments and why that mechanism was chosen. If a mechanism needs to be developed, describe the plan and a schedule to do so. If the ordinance or regulatory mechanism is already developed, include a copy of the relevant sections with the program. The UDO and the City Design Standards will continue to be used to address storm water design for new developments as described above. Identify how the long-term operation and maintenance (O&M) of the selected BMPs will be ensured. Options to help ensure that future O&M responsibilities are clearly identified include an agreement between the permittee and another party such as the post-development landowners or regional authorities. The City Development Review Committee requires all new development to submit a Storm Water Drainage/Treatment Maintenance Plan for approval by the City Engineer. This approach has been used for several years. The requirement is documented in the City design standards and specification guidelines. The UDO may need to be updated to reflect this requirement. It is estimated that 40 hours of staff time will be required for this task. To enforce these requirements, the City may consider instituting a periodic inspection program. Identify who is responsible for the overall management and implementation of the post-construction storm water program and, if different, who is responsible for each of the BMPs identified for this program. The overall management and implementation of the post-construction storm water program will be handled by the Engineering Department, with assistance from the Planning Department. The Engineering Department is also responsible for the BMPs selected for this program. Identify how the success of this minimum control measure will be evaluated, including how the measurable goals for each of the BMPs were selected. The success of this minimum control measure will be evaluated by completing the tasks shown in Table 4.3-7. The estimated cost for the development of the Post-Construction Storm Water Management MCM is $40,500 and 420 hours over 5 years. The cost, as show in Table 4.3-7, is mostly staff time and is about $2,000 annually. 4-26 Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4.3-7 Minimum Control Measure No. 5 – Post Construction Storm Water Management Year Total Measurable Goal Primary Responsible Entity Assistant Responsible Entity 1 2 3 4 5 Hours 0 0 0 0 0 0 Protection of Sensitive Areas: The Bozeman 2020 Community Plan will continue to be in effect annually and will be updated as necessary. COB --- Direct Cost* $0 $0 $0 $0 $0 $0 Hours 40 40 40 40 40 200 UDO, which will include post-construction runoff requirements, will be prepared for review and adoption by the City of Bozeman Commission in the year 2004 and thereafter effective annually. COB --- Direct Cost $0 $0 $0 $0 $0 $0 Hours 4 4 4 4 4 20 Unified Development Ordinance, which will include requirements to ensure long-term operation and maintenance of BMPs, will be prepared for review and adoption by the City of Bozeman Commission in the year 2004 and thereafter effective annually. COB --- Direct Cost $20,000 $0 $0 $0 $0 $20,000 Hours 0 16 4 4 4 28 BMP manual will be completed by December of 2006. COB --- Direct Cost $0 $10,000 $0 $0 $0 $10,000 Total Estimated Staff Hours for MCM No. 4 84 84 84 84 84 420 Total Estimated Staff Cost for MCM No. 4 $2,100 $2,100 $2,100 $2,100 $2,100 $10,500 Total Estimated Direct Cost for MCM No. 4 $20,000 $0 $0 $0 $0 $20,000 Total Estimated Cost for MCM No. 4 $22,100 $12,100 $2,100 $2,100 $2,100 $40,500 COB = City of Bozeman MCM = Minimum Control Measure *Direct costs are exclusive of hours, and include material costs such as printing, presentation material, production cost for stencils, etc. 4-27 Bozeman Storm Water Facilities Plan 4-28 The storm water system is cleaned once per year and again as conditions dictate. 4.3.7 Minimum Control Measure 6 – Pollution Prevention and Good Housekeeping for Municipal Operation This control measure requires the City to develop and implement an operation and maintenance program with the goal of preventing pollutant runoff from its own municipal operations. The permittee shall document the decision process for the development of a pollution prevention/good housekeeping program for municipal operations. The rationale statement must address both the overall pollution prevention/good housekeeping program and the individual BMPs, measurable goals, and responsible persons/positions for the program. The rationale statement must include the following information, at a minimum: Identify the operation and maintenance program to prevent or reduce pollutant runoff from municipal operations. The program must specifically list the municipal operations which are impacted by this operation and maintenance program. The permittee shall also include a list of facilities or activities (excluding construction) which are owned or operated by the permittee that are subject to the Department’s other MPDES storm water discharge permits, and which discharge into the permitted small MS4. Include the Department’s MPDES permit number for each facility or activity. The City currently has several BMPs in place at its City Shop and fleet management, and employees are trained in proper wastewater disposal techniques. The catch from the wash bay basins are sent to the wastewater treatment plant, the shop complex lot is swept weekly, and oil absorbent floor dry is kept on hand in the vehicle maintenance shop for cleanup of spills. All fuel tanks are concrete encased vaults, and the waste oil tank is in a concrete enclosure. Shop parts washers use only hot water, not solvents, and for asphalt paving operation, only water based tack oil is used. Citrus based cleaners are used for the patching machine and tools. All equipment is also inspected for leaks and repaired if needed, before use. The City initially applied for permit coverage for its Wastewater Treatment Plant (WWTP). However, there are no outfalls for drainage from the WWTP site and the City issued a letter to MDEQ indicating its opinion that a permit should not be required. Identify any government employee training program which will be used to prevent and reduce storm water pollution from activities such as park and open space maintenance, vehicle fleet and building maintenance, new construction and land disturbances, and storm water system maintenance. Describe any existing, available materials which are planned to be used. Describe how this training program will be coordinated with the outreach programs developed for the public information minimum control measure and the illicit discharge minimum control measure. The program description must specifically address the following areas: Maintenance activities, maintenance schedules, and long-term inspection procedures for controls to reduce floatables and other pollutants to the permitted MS4. Controls for reducing or eliminating the discharge of pollutants from streets, roads, highways, municipal parking lots, maintenance and storage yards, waste transfer stations, vehicle fleet or Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance maintenance shops with outdoor storage areas, salt/sand storage locations, and snow disposal areas operated by the permittee. Procedures for the proper disposal of waste removed from the permitted small MS4 through the permittee’s municipal operations, including dredge spoil, accumulated sediments, floatables, and other debris. Procedures to ensure that new flood management projects are assessed for impacts on water quality and existing projects are assessed for incorporation of additional water quality protection devices or practices. The City shop may need to apply for industrial permit coverage under the new rules. The rule says “facilities classified as standard industrial classification...which have vehicle maintenance shops, equipment, cleaning operations, or airport deicing operations.” MDEQ has not clarified specific requirements. Street Sweeping: The City’s street sweeping program is its largest investment to reduce pollutants in drainage. The City conducts sweeping for aesthetic, safety and public health reasons. The City sweeps its arterial areas once a week and residential areas twice a year (once in the spring and once in the fall), currently spending about 1,500 hours per year on street sweeping. The City uses a combination of salt, sand, and magnesium chloride in the winter to improve road safety. The City has already reduced the sediment (sand) in runoff by adding salt and magnesium chloride to their program. A total of 200 tons of salt, 2,000 tons of sand and about 5,000 gallons of magnesium chloride are used in a typical year. If sediment, oil and grease concentrations continue to exceed bench mark values, more sweeping hours may be required. Another way to improve pollutant removal is to replace aging sweepers with new, more effective units. Newer models are capable of capturing finer particles and generate less wash water than old models. In the permit, the City has agreed to sweep 600 miles in the downtown area annually and 200 miles of residential areas. Catch Basin and Manhole Cleaning: Another major component of the City’s maintenance program is cleaning catch basins and manholes, as well as screens located in ditches, streams and canals. The City currently cleans out catch basins once before spring runoff and subsequently only if sediment, trash or other accumulation is repeated. Screens are also cleaned once per year before spring runoff. Material collected is disposed of at the landfill. The City could improve this approach by establishing and keeping a regular inspection/cleaning of all catch basins, inlets, and detention basins. The utilities maintenance department may decide on different inspection frequency for wet season and dry season. Establishing and maintaining a regular cleaning frequency for catch basins would be an additional bookkeeping burden on the utilities maintenance department. However, the task could be simplified by using the electronic system map (maintained in the City’s GIS or maintenance management system) with a laptop computer to log when the inspections have been done and to record staff observations. Maintaining inspection data would allow the utilities maintenance group to have better information to make decisions about what areas need more inspection and where best to spend City time and energy in additional inspections or cleaning. 4-29 Bozeman Storm Water Facilities Plan 4-30 Procedures to ensure the flood management projects are assessed for water quality are described under Minimum Control Measure No. 5, Post-Construction Runoff Control. Identify who is responsible for overall management and implementation of the pollution prevention/good housekeeping program and, if different, who is responsible for each of the BMPs identified for this program. The overall management of this measure will be shared between the City and MSU. The sweeping duties will be done by both entities. A household hazardous waste collection event will be put on every other year by the City, along with a conditionally exempt small quantity generator collection event. A hazardous wastetransfer station allows residents to drop off household hazardous waste every Saturday. The waste is disposed of by the City. Identify how the success of this minimum control measure will be evaluated, including how the measurable goals for each of the BMPs were selected. The success of this Minimum Control Measure will be measured by the completion of BMPs found in Table 4.3-6. Costs and Hours Minimum Control Measure 6 is expected to require about 2,000 hours over the next 5 years and cost about $50,000. Annual cost and hour estimates are shown in Table 4.3-8. Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4.3-8 Minimum Control Measure No. 6 – Pollution Prevention and Good Housekeeping for Municipal Operation Year Total Measurable Goal Primary Responsibl e Entity 1 2 3 4 5 Hours 100 100 100 100 100 500 Street Sweeping: Continue to sweep 600 miles in the downtown area and business district and continue to sweep 200 miles of residential area annually by December. COB & MSU Direct Cost* $0 $0 $0 $0 $0 $0 Hours 120 120 120 120 120 600 Catch Basin & Manhole Cleaning: Clean approximately 110 storm water manholes and 465 catch basins annually by December. COB & MSU Direct Cost $0 $0 $0 $0 $0 $0 Hours 0 0 40 40 40 120 Provide training to employees on good housekeeping practices, by December of 2007. COB & MSU Direct Cost $0 $0 $0 $0 $0 $0 Total Estimated Staff Hours for MCM No. 6 376 400 400 400 400 1,920 Total Estimated Staff Cost of MCM No. 6 $9,40 0 $10,00 0 $10,00 0 $10,00 0 $10,00 0 $49,400 Total Estimated Direct Cost for MCM No. 6 $0 $0 $0 $0 $0 $0 Total Estimated Cost for MCM No. 6 $9,40 0 $10,00 0 $10,00 0 $10,00 0 $10,00 0 $49,400 COB = City of Bozeman MSU – Montana State University MCM = Minimum Control Measure *Direct costs are exclusive of hours, and include material costs such as printing, presentation material, production cost for stencils, etc. 4.4 Reporting Requirements The City will be required to submit an annual report on permit-related activities to MDEQ. This report must include a discussion of the progress toward reduction of pollutants discharged and progress toward achievement of the measurable goals for each minimum control measure. This report must also include any sampling results and a summary of storm water activities that are planned for the upcoming reporting cycle. In addition, any proposed changes to the Storm Water Management Plan, including any BMPs or any applicable measurable goals, must be included with the annual report along with notice if the permittee is relying on another entity to satisfy permit obligations. 4-31 Bozeman Storm Water Facilities Plan 4-32 The report must be submitted to MDEQ by January 28th each year. It must also include any incidents of noncompliance, or certification of compliance with the permit. Any activities completed by co-permittees must be gathered and documented. A sample annual report is shown in Appendix F (NPDES Materials). It is estimated preparation of the annual report will take 80 hours per year. 4.4.1 Sampling The permit also requires grab sampling (from two locations approved by MDEQ) of storm water. This sampling must take place twice a year at two locations: once between January 1st and June 30th and once between July 1st and December 31st. One location shall represent one of the larger drainage areas from a commercial/industrial district. The other shall represent drainage from one of the larger residential areas. Samples must be collected within the first 30 minutes of discharge. Samples must be tested for the parameters listed in Table 4.4-1 and results will be compared against the median concentrations shown. The estimated flow rate at the time of discharge is also recorded. It is estimated 16 hours per year of staff time will be needed to collect samples, convey to labs, review and report results. Table 4.4-1 Testing Parameters and Median Concentrations Parameters, units Median Concentration Total Suspended Solids, mg/L 125 Chemical Oxygen Demand, mg/L 80 Total Phosphorus, mg/L 0.41 Total Nitrogen, mg/L 2.00 Total Copper, mg/L 0.040 Total Lead, mg/L 0.165 Total Zinc, mg/L 0.210 Oil and Grease, mg/L 10 pH 6-9 Source: General Permit for Storm Water Discharge Associated with Small MS4’s, Table 2. Median Concentrations. An analysis of storm water quality in four watersheds in Bozeman was conducted in the 1982 Storm Water Master Plan. Two watersheds were primarily residential, two were residential and commercial. The 1982 data collected were submitted to MDEQ along with the City permit application in March of 2003. In 1982, storm water quality for all parameters exceeded regulated parameters (with the exception of pH). In addition, fecal coliform (not regulated in the permit) was detected at elevated levels. In 2005, the City conducted storm water quality testing at six locations. The results are shown in Table 4.4-2 (2005 Storm Water Quality Testing). Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance Table 4.4-2 2005 Storm Water Quality Testing Total Suspended Solids (mg/L) Chemical Oxygen Demand (mg/L) Total Nitrogen (mg/L) Total Phosphorus (mg/L) Oil and Grease (mg/L) Median Concentration Required by MDEQ General Permit 125 80 2.00 0.41 10 Downtown 112 190 3.0 1.62 13 Tamarack 112 110 2.8 0.54 13 Villard 8th and 9th 110 270 3.4 2.15 12 Langhar and Westridge 48 180 2.0 1.09 7.2 Bozeman Creek North of Tamarack 22 29 1.0 0.14 3 Bozeman Creek South of Kagy ND1 14 0.5 0.03 7.1 Summary No samples exceeded median concentration 4 samples exceeded median concentration 3 samples exceeded median concentration 4 samples exceeded median concentration 3 samples exceeded median concentration Source: City of Bozeman Street Department. Samples tested by Energy Laboratories, Helena Mt. 1 ND – Not detected at the reporting limit More than half of the samples taken in November 2005 exceeded the median concentrations presented in the MDEQ General Permit. Additional semi-annual sampling conducted under this permit will determine whether current water quality continues to exceed MDEQ benchmark values or whether runoff quality will improve under Phase 2 implementation. Storm water quality is inherently highly variable. Higher concentrations of pollutants exist in the beginning of a discharge and fall off over time. The MDEQ benchmark values are based on median concentrations from a database developed by the EPA. By definition, approximately half of the samples would reasonably be expected to exceed these values. In addition, these values indicate the quality of the storm water discharged, rather than the quality of the receiving water. The exceedance of a benchmark value does not necessarily indicate stream water quality is impaired. Nevertheless, MDEQ is regulating in-pipe water quality. 4-33 Bozeman Storm Water Facilities Plan 4-34 4.5 Co-Permitting MDEQ has allowed Phase 2 entities listed for coverage to submit one permit and share responsibility. Application fees are reduced by submitting less than one contract. The total Application fee is $10,500. Written acceptance of the obligation as a co-permittee is required. If that obligation is not fulfilled, the City remains liable for that failure to implement. This written acceptance of obligation is documented in a Memorandum of Understanding. Both MSU and MDT (in the Bozeman area) were listed by MDEQ and required to get Phase 2 Permit coverage. The City decided to co-permit MSU and MDT. MSU and MDT both paid a portion of the application fee; however, the City bears the long term regulatory burden and the costs associated with the annual reporting for all three permittees in the current arrangement. In addition, although not obligated as a co-permittee, the Gallatin Local Water Quality Protection District (GLWQPD) agreed to perform some permit activities, given that many Water Quality Protection District (WQPD) residents are also City residents and many of their existing activities help meet the MDEQ requirements. 4.5.1 Montana State University MSU discharges storm water to the City network via several 18-inch connections along College Avenue. The City does not currently charge MSU for this service. The connections are described more completely in Chapter 1 (Existing System Inventory). The MSU permit activities are summarized in Table 4.5-1. The activities described are primarily those that MSU conducted as part of normal operation and maintenance of their system, and generally supplement activities the City is conducting. A draft Memorandum of Understanding (MOU) has been prepared for MSU. The MOU describes these activities and annual reporting both on the completion of these tasks and the costs associated with completing them. In addition, the agreement holds MSU responsible for a portion of the initial application fee and indicates an alternate fee structure is yet to be developed Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance 4-35 Table 4.5-1 MSU Phase 2 Permit Activities Year Measurable Goal 1 2 3 4 5 MSU will continue to conduct one campus cleanup per year using community volunteers. X X X X X Existing MSU storm sewer system maps will be reviewed in the year 2004 to ensure that the size and location of all outfalls and names and locations of all outfall receiving waters are shown. X MSU storm sewer system maps will continue to be updated annually, if necessary. X X X X X Visually inspect MSU storm sewer outfalls for non-storm water discharges in Year 2. X The need for an Illicit Discharge Detection and Elimination Plan will be evaluated, and prepared if necessary, in the year 2005. X Approximately 4 miles of roads on campus will continue to be swept annually. X X X X X All storm water manholes and catch basins will continue to be cleaned over a two year period. X X X X X MSU ground personnel will continue to be trained and certified in ground application maintenance annually. X X X X X 4.5.2 Montana Department of Transportation MDT maintains numerous thoroughfares in the City, including Interstate 90, Main Street, Rouse Avenue, Seventh Avenue, North 19th Avenue and Griffin Street. MDT was listed by MDEQ as required to get Phase 2 permit coverage in Bozeman. Drainage from some MDT facilities discharge to the City storm system and the City does not charge MDT for this service. MDT was not assigned tasks in the permit application, but MDT prepared a list of activities they would be willing to complete in support of the permit. In the interest of keeping the permit as simple as possible while meeting the minimum requirements specified, no MDT activities are included at this time. The MOU with MDT does not include completion of any specific tasks, but indicates they will reimburse the City for a portion of their cost in exchange for permit coverage. Bozeman Storm Water Facilities Plan 4-36 4.5.3 Gallatin Local Water Quality District The Gallatin Local Water Quality District (GLWQD) is not required by MDEQ to submit a Phase 2 permit application. The GLWQD, however, already provides a number of services that meet requirements of the minimum control measures in the Phase 2 permit application. The activities the GLWQD will contribute are summarized below. These are primarily activities the district performs annually as part of normal operations. The MOU for GLWQD is different for MSU and MDT. The agreement is purely voluntary. Essentially, GLWQD agrees to perform the activities shown in Table 4.5-2, as time and money allow them to do so. The City remains the responsible party for implementation. Chapter 4: National Pollutant Discharge Elimination System Phase 2 Permit Compliance Table 4.5-2 GLWQD Phase 2 Permit Activities Year Measurable Goal. Primary Responsible Entity Assistant Responsible Entity 1 2 3 4 5 An educational display booth containing storm water information will be set-up at the Gallatin County Fair annually, starting in Year 2. COB GLWQD X X X X A Storm Drain Decal Program Plan will be prepared in Year 3. COB GLWQD X A Storm Drain Decal Program will be conducted in Year 4. COB GLWQD X A Storm Drain Decal Program Brochure will be developed and utilized in Year 4. COB GLWQD X A Household Hazardous Waste Collection Event will be conducted in Years 1, 3 and 5. COB GLWQD X X X A Conditionally Exempt Small Quantity Generator Collection Event will be conducted in Years 1, 3 and 5. COB GLWQD X X X Approximately 500 copies of each of the brochures will be distributed in Years 1, 3 and 5. GLWQD COB X X X Three storm water presentations will be conducted at clubs/schools in Years 1, 3 and 5. COB GLWQD X X X 4.6 Summary Table 4.6-1 shows the estimated annual cost for completing the six Minimum Control Measures. The overall cost for five years of coverage under this permit is about $500,000. The average annual cost is close to $50,000 in years 2 through 5, and almost $300,000 in the first year. 4-37 Bozeman Storm Water Facilities Plan Table 4.6-1 Total Annual Cost for Permit Process Year Total Minimum Control Measure 1 2 3 4 5 Hours 240 296 296 296 296 1424 Public Outreach and Education Direct Cost* $8,000 $5,000 $5,000 $5,000 $5,000 $28,000 Hours 20 20 100 140 20 300 Public Involvement and Participation Direct Cost $0 $0 $0 $3,100 $0 $3,100 Hours 460 360 480 36 360 2,020 Illicit Discharge Detection and Elimination Direct Cost $201,500 $500 $500 $500 $500 $203,500 Hours 84 84 84 2164 2164 4580 Construction Site Storm Water Runoff Control Direct Cost $20,000 $0 $0 $50,000 $50,000 $120,000 Hours 84 84 84 84 84 420 Post-Construction Storm Water Management Direct Cost $20,000 $0 $0 $0 $0 $20,000 Hours 376 400 400 400 400 1,976 Pollution Prevention and Good Housekeeping for Municipal Operation Direct Cost $9,400 $10,000 $10,000 $10,000 $10,000 $49,400 End of Year Sampling Hours 16 16 16 16 16 80 Annual Report Hours 80 80 80 80 80 400 Total Estimated Staff Hours 1,360 1,340 1,540 3,624 3,504 11368 Total Estimated Staff Cost $34,000 $33,500 $38,500 $36,500 $33,500 $176,000 Total Estimated Direct Cost $258,900 $15,500 $15,500 $68,600 $65,500 $424,000 Total Estimated Cost $292,900 $49,000 $54,000 $105,100 $99,000 $600,000 *Direct costs are exclusive of hours, and include material costs such as printing, presentation material, production cost for stencils, etc. 4-38 Bozeman Storm Water Facilities Plan Chapter 5. Financial Management Evaluation Chapter 5: Financial Management Evaluation 5-i Table of Contents 5.1 Introduction ........................................................................................................................5-1 5.1.1 Current Storm Water Program Elements and Costs.................................................5-1 5.1.2 Summary of Current Costs............................................................................................5-3 5.1.3 Historic Funding Sources ..............................................................................................5-5 5.2 Estimated Future Storm Water Costs .............................................................................5-5 5.3 Overview of Funding Options .........................................................................................5-6 5.4 Financial Program Recommendations ..........................................................................5-11 5.4.1 Recommended Storm Water Charge Rate Methodology........................................5-12 5.4.2 Criteria for Rate Structure Selection...........................................................................5-12 5.5 Government Accounting Standards Board Statement No. 34 (GASB 34).............5-13 Table of Figures Figure 5-1-1. Storm Water Related Costs.....................................................................................5-4 Table of Tables Table 5.1-1 Financial Summary for Storm Water Management................................................5-4 Table 5.2-1 Estimated Future Storm Costs..................................................................................5-6 Table 5.3-1 Comparison of Storm Water Funding Alternatives .............................................5-10 Chapter 5: Financial Management Evaluation 5.1 Introduction The purpose of this chapter is to evaluate storm water needs and funding sources, and to evaluate alternatives and recommendations on possible future funding avenues for storm water activities. The City of Bozeman does not currently have a dedicated source of funding for its storm water management program. It has funded a majority of its storm water management operational programs and investment in capital facilities through street maintenance fees. However, as the cost for storm water infrastructure increases, along with the added cost of fulfilling the new NPDES Phase II requirements, a dedicated revenue stream may be needed. 5.1.1 Current Storm Water Program Elements and Costs The following is a description of the current City of Bozeman storm water program elements. Administration The storm water system program is administered by the Public Service Department, the Administration Office, the City Engineer and the Street Division Superintendent. Special Programs Complaints regarding deficiencies in capacity and matters related to construction projects are fielded by the Engineering Division staff. Street Maintenance Division generally handles complaints that are maintenance and repair oriented. There are currently no formal procedures in place for routing calls and addressing complaints. The Phase II NPDES program will require implementation of a more formal program for following up on complaints as discussed in Chapter 4. A GIS data management system has been initiated by the City of Bozeman and is managed and run by the GIS Division. This data is utilized to prepare and update maps of the storm water system. Street Sweeping and Snow Removal The City’s street sweeping program is its largest investment to reduce pollutants in drainage. The City conducts sweeping for aesthetic, water quality, safety and public health reasons. The City sweeps its arterial areas once a week and residential areas twice a year (once in the spring, and again in the fall), currently spending about 1,500 hours per year on street sweeping. Total annual costs of street sweeping are shown in Table 5.1-1, and totaled over $100,000 in 2005 which is over 50% of the total documented expenditures incurred for storm water related activities in 2005. The City uses a combination of salt, sand, and magnesium chloride in the winter to improve road safety. The City has reduced the sediment (sand) in runoff by adding salt and magnesium chloride to their program. A total of 200 tons of salt, 2,000 tons of sand and about 5,000 gallons of magnesium chloride are used in a typical year. 5-1 Bozeman Storm Water Facilities Plan Oil and Antifreeze Recycling In an effort to prevent the improper disposal of used oil and antifreeze, the City of Bozeman recycling program collects used oil and antifreeze at no added cost for city and Gallatin County residents. It is illegal to pour motor oil on the ground, in alleys and especially down city storm or sanitary sewers. Fall Leaf Clean Up From 2001 to 2005, the most expensive storm water activity was street sweeping at an average of $73,093 per year, and the second most costly was the fall leaf clean-up at about $21,411 per year. Engineering The Engineering Division provides support for storm water-related items. However, there are no programs or personnel 100% dedicated to storm water tasks at this time. Storm water tasks currently being accomplished include implementing technical ordinances and design criteria, design and inspection of capital improvements, and building and subdivision review. In addition the Phase II NPDES program reporting and monitoring requirements are completed by the Engineering Division. Operation and Maintenance The Bozeman Street Maintenance Division currently includes a crew of 10 full time employees who maintain over 228 miles of streets and alleys. The Street Maintenance Division is responsible for keeping the storm drain system functional. To some extent, all of the Street Maintenance Division employees work on the storm water system. Street Maintenance Division responsibilities include both routine and remedial maintenance activities. Routine maintenance covers activities that occur on a regular basis on a fully functional storm drainage system; this includes cleaning and clearing the storm system. Remedial maintenance covers repair activities that improve the systems performance without increasing its capacity; this includes repairing existing system elements and restoring them to their originally constructed condition. The Street Maintenance Division uses street sweepers, backhoes, and vacuum truck for storm water maintenance. The City of Bozeman’s current storm water activities are ancillary to its Street, Parks, Landfill, and Wastewater Division functions. The primary efforts are expended by the Street Division which is supported by Street Maintenance Fees. Maintenance of park lands that include storm water facilities through the Parks Division is supported by the General Fund. Much lesser efforts are expended in maintenance of storm water facilities serving the landfill and the wastewater treatment plant, funded by the Solid Waste and Wastewater Enterprise Funds, respectively. The Unified Development Ordinance allows for retention or detention facilities to be constructed within common open space, if designed to be conducive to the normal uses and maintenance of the open space. The City is responsible for the operation and maintenance of storm water facilities located on City-owned land, rights-of-way, and easements. Other facilities shall be maintained by the applicable property owners association. 5-2 Chapter 5: Financial Management Evaluation Regulation and Enforcement The Unified Development Ordinance (UDO) contains the standards and procedures for all subdivisions and land development within Bozeman. The UDO includes chapters relating to general land use development standards, stream setbacks, parkland use as storm water detention facilities, wetlands regulations, and floodplain regulations. By reference, the UDO incorporates the Engineering Division’s Design Standards and Specifications. These standards include the City’s current policy on storm water control. In summary, storm water control should limit runoff to pre-development rates, and treatment to remove solids, silt, oils, grease and other pollutants is required of all new development within the City of Bozeman. The City of Bozeman’s regulatory controls for storm water are administered through the Engineering Division. Regulations, policies, ordinances, design requirements and guidelines are enforced when plans are submitted for engineering review. Drainage Plan and Inspections The Engineering Division’s Design Standards and Specifications require the submittal of storm water drainage plans for review by the City for all new developments, including subdivisions, multi-family, business or commercial uses, and developments for which building permits are drawn. Drainage plans are to include hydrologic and hydraulic calculations that are consistent with the design standards set forth in the policy. Capital Improvements Major storm water capital improvement projects have not historically been included in annual budgets. Prohibitions and Enforcement It is unlawful to encroach upon, fill or dispose of materials in natural or manmade drainageways. It is also unlawful to dispose of any hazardous substance in a drainageway, and responsible parties are liable for the cost of cleanup resulting from deposit of materials or spills. Cross connections between sanitary sewers and storm drains are prohibited. The UDO requires compliance with the ordinance such that “no development shall commence unless it is in conformity with all of the regulations herein specified for the district in which it is located.” In addition, “Drainage systems shall not discharge into any sanitary sewer facility or agricultural water user facility.” However, the City does not have a clear enforcement mechanism, defined sanctions or fines for violations of the storm water provisions of the UDO. 5.1.2 Summary of Current Costs Since 2001, the City of Bozeman Streets Division has been tracking storm water-related costs; these are shown in Table 5.1-1. The list only includes activities performed by the Street Division. The City does not have a dedicated funding source and has typically only had the funding and manpower to service the system on a limited basis in addition to being able to address emergency events. Also, the table shows costs for five years, and costly 5-3 Bozeman Storm Water Facilities Plan storm water improvement projects, or emergency repairs may or may not have occurred during that period. Figure 5.1-1 provides a summary of storm water related costs from 2001 to 2005. Table 5.1-1 Financial Summary for Storm Water Management ACTIVITY 2001 2002 2003 2004 2005 Clean Storm Sewer Appurtenances and Ditches $26,767 $32,088 $29,219 $22,316* $30,731 Repair Storm Sewer System $758 $3,743 $3,296 $3,284 $8,860 Leaf Cleanup (Fall Clean Up) $24,499 $28,084 $21,757 $31,587 $32,650 Street Sweeping and Cleaning $70,245 $79,316 $81,094 $41,368 $108,624 Miscellaneous Expenses $0 $0 $0 $0 $9,739 TOTAL $122,269 $143,231 $135,366 $98,555 $190,604 Note: These costs do not include overhead, administration, or other indirect costs. *Street cleaning costs were down due to extended cold weather conditions and a reduced staff. Storm Water Related Costs $0 $50,000 $100,000 $150,000 $200,000 $250,000 20012002200320042005 Year Figure 5-1-1. Storm Water Related Costs. It is noted that indirect costs, administrative costs and support costs are not currently tracked or accounted for in the above information. For example the Engineering Division and Director of Public Service provide services that are storm water related that do not appear in the above information. 5-4 Chapter 5: Financial Management Evaluation 5.1.3 Historic Funding Sources The previous section provides an estimate for yearly storm water related costs associated only with the Streets Division; which on average have been about $138,000 per year and increasing, with the most recent year (2005) costs of almost $200,000. The City of Bozeman does not have a dedicated source of funding for storm water-related activities. As mentioned above, funding for storm water-related activities comes from the Street Maintenance Fund. The General Fund accounts for the financial operations of the City which are not accounted for in any other fund. Principal sources of revenue are property taxes, state and local shared revenues, licenses and permits, and charges for services provided to other funds. Principal expenditures in the general fund are made for police and fire protection, public works, and general government. The Street Maintenance Fund is funded through a special assessment on all improved properties in the City. Storm water maintenance activities are considered an extension of the street system maintenance activities. An indirect funding source is the Gallatin Local Water Quality District (GLWQD) which was created by the Gallatin County Commission and approved by the Montana Board of Environmental Review in 1997. The District covers the middle third of Gallatin County encompassing 815 square miles. This includes the cities of Bozeman and Belgrade. A fee of $6.00 for improved properties and mobile homes within the District is assessed on an annual basis. This generates approximately $125,000 per year. The District's programs and activities are focused on the following: Education: Providing effective education programs to increase public awareness and understanding of the importance of protecting and improving water resources within the District. The programs are a combination of GLWQD programs and cooperative involvement with programs conducted by other organizations. Monitoring: Maintaining a long-term, water quality and quantity monitoring network to establish baseline data, and conducting long-term water quality and quantity monitoring. Information Collection and Dissemination: Collecting, compiling and disseminating water resource data and information for the benefit of all citizens, organizations, groups, and governmental agencies interested in water resources within the District. The City of Bozeman storm water management program benefits from the activities of the GLWQD, although none of the money generated goes directly into storm water system improvements, infrastructure, or operation and maintenance. 5.2 Estimated Future Storm Water Costs Storm water-related costs will increase in the future for the City of Bozeman due to several factors including population growth, development, additional infrastructure to operate and maintain, NPDES Phase II regulations, increasing environmental regulations, inflation, and cost of construction and materials. Therefore, it is critical for the City to plan for these costs and identify funding needs and sources. For planning purposes, the storm water-related costs from 2005 of almost $200,000 are assumed to be a minimum yearly cost of operation 5-5 Bozeman Storm Water Facilities Plan and maintenance. In addition to this $200,000, the following costs should be included in future planning: Phase II Implementation: The requirements of the Phase II Storm Water NPDES Permitting program are expected to add approximately $100,000 per year in expenses for management and administration of the storm water program and implementation of non-structural best management practices (BMPs). Refer to Chapter 4. Capital Improvements: The City of Bozeman currently does not have a capital improvements program associated specifically with their storm water system. An initial annual budget of $200,000 per year is suggested to begin to address system problems. Refer to Chapter 6. Table 5.2-1 Estimated Future Storm Costs Direct Operational Costs (2005) $191,000 Phase II Implementation $100,000 Capital Improvements $200,000 Sub total $490,000 Indirect Costs (20% of total) $98,000 Total Costs per Year (2005 dollars) $589,000 Table 5.2-1 (Estimated Future Storm Water Costs) shows that storm water related expenses will likely increase by more than 182% in this permit cycle (5 years) to implement new regulations and begin to address needed capital improvements in the system. It is likely that as the permit program matures additional capital costs will be required (to improve discharge water quality) and a new full time staff person to handle the work will likely be needed. 5.3 Overview of Funding Options The following sections provide information on various funding options that are available to fund storm water programs. Additional detail on some of the funding mechanisms and example utility rates from other communities in Montana and the northwest is provided in Appendix H. Historic Funding The City of Bozeman has historically funded storm water activities through the Street Maintenance Fund. One alternative would include continuing to fund storm water activities through theses sources. However, as the required level of funding increases for the storm water system the impact on these funds will become greater. Enterprise Funds (Utility Funds) The most common funding system found in local governments after the general fund is the enterprise fund. Enterprise funds are usually designated for a specific set of services that are 5-6 Chapter 5: Financial Management Evaluation provided. Typical examples are those that fund municipal refuse collection systems, water service, sewer maintenance, or any other designated service. The expenses for this type of fund are dedicated to providing a service to the municipality, and revenues that fund that service are derived from fees that are charged to the users. Most enterprise funds consist of expenses for providing the service and also include direct expenses such as salaries, benefits, materials and supply, and capital outlay. The City of Bozeman uses enterprise funds to account for the financing, acquisition, operation and maintenance of water, sewer, and solid waste facilities, which are supported by user charges. Revenues are derived from fees that are established by the governing body. These fees are based on the delivery of a measurable service unit, whether it's the cost of picking up the trash at the location or the cost of processing the quantity of sewage or storm water estimated to be generated by the location. Although in some cases the fees are a mandatory charge resulting from health and safety needs—for example, weekly refuse collection—other portions of the fee may be based on the desired services that the location voluntarily elects to receive. Even in cases where charges are mandatory a flexible level of service can be provided at various funding levels, the City’s current solid waste fee is an example of a level of service charge. Storm water services are increasingly being considered for enterprise funds as well, but because the services are not always as apparent to residents and businesses, establishing a storm water enterprise fund or utility is often controversial. The challenge facing the storm water manager is in establishing an allocation approach that would be equitable for all users. Typical parameters involved in accessing fees for storm water utilities include the following: • Landowners and/or residents are classified as residential and non-residential customers of the utility. Residential customers are handled on a class-wide basis, and nonresidential customers are handled individually based on their specific storm water drainage characteristics. • The basis for calculating periodic fees usually consists of impervious area, gross area with runoff, or a combination of the two. This is typically obtained from tax assessment information, and direct measurement of affected properties. • The fees can be assessed on a monthly basis, in the same manner as water or wastewater bills, or on an annual or semi-annual basis as a part of property tax billings. • The periodic charge is based on established cost-of-service principles and is intended to recover annual operation and maintenance costs, with contribution to capital cost recovery. Special Districts Special districts or assessment districts are another type of funding structure that may be useful in providing funding for programs within a specific geographical area. These districts are usually well-defined and based on legally described physical boundaries. All property within a special district is assessed a fee for the services delivered and the cost of those services. Typically, there are two categories of special districts. Capital improvements for infrastructure projects are one type of special district projects, examples in the City of Bozeman include the Babcock Street SID and the Northwest Waterline SID that have funded specific projects for specific areas of the community. The second type of special 5-7 Bozeman Storm Water Facilities Plan district utilized in Bozeman is the Street and Tree Maintenance districts that provide funding for overall maintenance of streets and trees for the entire city. In many cases, special districts are formed at the time large parcels are subdivided and developed. In order to form a special district to provide maintenance, all the property owners in the proposed district have a right to protest the creation of such a district. Obviously, if a single owner controls the entire parcel; such a protest provision would be relatively straightforward. But in the event that a district is proposed for an existing tract of developed property, a majority of property owners must vote positively for the assessment district, with various limitations. Politically, the challenge in establishing a special district is that the elected official is asking each property owner to pay a fee for a service that directly benefits the affected property owners. Such fees are usually included on the tax bill as a separate assessment, and there is no ability for the property owner to opt out of the district once it is established. Impact Fees Unlike enterprise funds in which the user of the system pays on a repeating basis for the use of an ongoing service, impact fees are one-time charges, usually the result of some action on the part of a property owner as it relates to use of the property. For example, if someone owns a vacant lot and decides to erect a building, he might have to pay a building permit fee, a school district assessment fee, and any number of other fees to the local jurisdiction to cover the jurisdiction's costs of inspection of the construction, or to offset the impact that this change of use has on various public systems. The limitation on the use of development fees is that they represent a one-time payment and therefore cannot be used for ongoing system maintenance and expansion of the various programs and projects to meet increasingly stringent regulatory mandates. The difficulty in utilizing impact fees for a storm water system such as Bozeman, is that the system is not based on a regional philosophy and as such needed storm water improvements serve very isolated areas of the community. Impact fee rates are generally established based on infrastructure that serves the greater community such as an arterial street or treatment plant expansion projects. Inspection and Review Fees The City conducts site inspections of new development and reviews development plans as they relate to storm water. Currently, the City does not charge a fee for this service. As costs of inspections and reviews increase, the City may consider implementing a fee. Bond Financing Bond financing is identical to borrowing money, except that the payment for the bond comes from the collective pockets of the constituency of the jurisdiction. In many cases, bond financing can be used to fund major infrastructure projects needed to implement the extensive storm water pollution prevention programs currently mandated in various areas. Getting passage of a bond measure can be a challenge, because in essence the voters are voting to tax themselves. There are several keys to passing a successful bond including the formation of a broad-based coalition within the environmental activist community, the regulatory community, and the city in an effort to go out and speak with one voice as to the need for the funding. Successfully passing storm water bonds may require considerable public education. 5-8 Chapter 5: Financial Management Evaluation Grants Another source of funding for storm water programs comes from various grants that are available from different State and federal agencies. Nationwide, only six or seven states offer major grant programs that support storm water. While there is not currently an on-going grant program available, it may be a feasible funding mechanism in the future. NPDES Co-Permitee Fees The City is currently permitting under the NPDES Phase 2 rule with two co-permittees: the Montana Department of Transportation, and Montana State University. During the first funding cycle (2006), the City paid the entire permit fee. In the future, the City could consider cost sharing with the co-permittees. Credits for Developer Improvements One method used to encourage and promote storm water practices above and beyond the minimum requirements is the use of ‘credits’. Credits can be issued to developers for a variety of services that may benefit the city including the following; construction of storm water facilities that serve more than the individual developments, use of Low Impact Development Best Management Practices, enhancements to wetlands, streams, and riparian habitat, and advanced storm water treatment systems and water quality improvements. The City of Bozeman utilizes payback districts as a mechanism to provide credit for water and sewer improvements. The payback district mechanism could be expanded for storm water improvements if such improvements benefit multiple undeveloped parcels. 5-9 Bozeman Storm Water Facilities Plan Table 5.3-1 Comparison of Storm Water Funding Alternatives Approach Pros Cons General Fund and Street Maintenance District Fund: Fund storm water activities through current mechanism as part of the Street Division. • Requires no change in current funding process. • Does not provide for dedicated funding source. • Funding in competition with other general and street fund budget items. • Street Maintenance District funding can only be used for maintenance activities that are directly related to streets. • Street Maintenance District funding cannot be used for capital improvements. Utility Fund: Create a storm water utility to directly fund storm water activities. • Creates dedicated funding source. • Provides mechanism for equitably charging property owners for value provided. • Provides long term stable funding. • Initial cost to create utility. • Requires support of the community. New Special Districts: Creation of one or more specific special districts to fund projects. • Provides capital for specific projects that serve identified geographic areas. • Each district needs to be individually established for capital improvements. • Capital funded improvement districts do not provide for long term operation and maintenance costs. Impact Fees: The expansion of the City’s existing impact fee program to include storm water facilities. • Provides capital based on rate and amount of development. • Does not provide funding for operation and maintenance. • Impact fee study required prior to implementation. • City’s current decentralized storm water system not as adaptable to impact fees as sewer and water utilities. 5-10 Chapter 5: Financial Management Evaluation 5-11 Table 5.3-1 Comparison of Storm Water Funding Alternatives Approach Pros Cons Inspection and Review Fees: Charge applicants for service provided at the permitting review stage and construction phase for new or expanded development projects. • Payment is made by those requesting service. • Only provides funding for a portion of storm water activities. Bond Financing: Fund capital improvements by obligating community to a bond. • Provides immediate capital for large projects. • Does not provide funding for operation and maintenance. • Requires community to vote to tax themselves. Grants: Fund storm water activities through available grant programs. • Potential to leverage local funds. • No current grant programs have been identified. NPDES Co-Permitee: Share permit fees with Montana State University and the Montana Department of Transportation. • Allows for equitable cost sharing. • Minimal funding opportunity. Credits for Developer Improvements: Allow for the creation of pay back districts for storm water facilities that provide regional benefit. • Encourages regional storm water solutions. • Pay back districts typically are slow to provide a return for the original developer and are difficult to administer. 5.4 Financial Program Recommendations It is recommended that the City of Bozeman work towards establishing a focused storm water program, and a storm water utility to support the program. The following recommendations for instituting a storm water utility are for information purposes only, and the City will need to collectively determine the most appropriate course of action for funding storm water related activities. Bozeman Storm Water Facilities Plan 5.4.1 Recommended Storm Water Charge Rate Methodology The recommended action is to establish a self-supporting fee structure for storm drainage management. This would bring together storm drainage activities into a single program. These activities include: routine maintenance and operations, planning, water quality monitoring and reporting, NPDES Phase II implementation, administration and a comprehensive capital improvements program. An initial step would be to establish a separate budget with line items for a Storm Water Fund. This could be completed even if a new funding source is not established. A separate budget will allow the City to track actual expenditures related to storm drainage. This not only serves as a record of costs, but also helps to justify a revenue source. Also, one part of a storm water management program will be in place. We suggest that the use of Street Maintenance and other funds for storm drainage be discontinued for two reasons: (1) clear separation of the two functions and (2) reserving street and other funds for other needs that still exceed funding. The proposed funding mechanism considers a number of criteria: balancing costs to benefits fairness to residents and businesses proportionate charges for storm water generated public understanding and acceptance simple and easy to administrate self supporting rate structure establishes a public storm drain program 5.4.2 Criteria for Rate Structure Selection There are numerous variations for imposing a rate structure. The purpose of this section is not to detail each of these rate structures, but to provide guidelines that may be applicable for the City of Bozeman. These include the following variations. Inspection and Review Fees The City does not currently conduct site inspections of new development storm water issues (i.e. erosion control). If MDEQ forces the City to conduct site inspection through the Phase 2 rule, the City shall implement a set of fees that require the direct beneficiary to pay for this service is fair and appropriate. It is recommended that the Engineering Division and Street Division implement a review fee similar to that developed by the Planning Office. Utility Fee Based Upon Impervious Surface Surveys show that the majority of rate methodologies use a single parameter, impervious coverage, to calculate charges. Impervious surfaces increase peak runoff rates, total volume of runoff and pollutant loadings. These impacts translate directly into the costs of providing services and facilities. The means of determining impervious surfaces on individual parcels can be made as simple or as detailed as desired. One of the easiest approaches is to base the charge on zoning or land use classifications. A more detailed method would utilize the actual amount of impervious surface on a parcel utilizing either an internal data base or the 5-12 Chapter 5: Financial Management Evaluation 5-13 State of Montana’s tax assessment data base. All parcels within the service area would be charged except for streets, roads, and public rights-of-way, vacant land, City parks, and agricultural land use. 5.5 Government Accounting Standards Board Statement No. 34 (GASB 34) Government Accounting Standards Board (GASB) Statement No. 34 (GASB 34) provides for Basic Financial Statements and Management's Discussion and Analysis for State and Local Governments. Bozeman is currently a participating City of the GASB 34. However, with regard to storm water infrastructure, the City of Bozeman will need to take additional steps to fulfill these requirements. One important aspect of the government-wide financial statements is the requirement for reporting of all capital assets, including infrastructure assets, in the government-wide statement of net assets and should generally report depreciation expense in the statement of activities. Infrastructure assets that are part of a network or subsystem of a network are not required to be depreciated as long as the government manages those assets using an asset management system that has certain characteristics and the government can document that the assets are being preserved approximately at (or above) a condition level established and disclosed by the government. Bozeman Storm Water Facilities Plan Chapter 6. Recommended Plan Chapter 6: Recommended Plan Table of Contents 6.1 Introduction ........................................................................................................................6-1 6.2 Regional versus Development Based Storm Water Management...............................6-1 6.2.1 Development-Based Approach...............................................................................6-1 6.2.2 Regional Approach....................................................................................................6-1 6.2.3 Recommended Approach ........................................................................................6-2 6.3 Storm Water Utility Implementation...............................................................................6-2 6.4 Storm Water Design Policy...............................................................................................6-3 6.5 Proposed Capital Facilities Solutions for Areas of Known Flooding ........................6-4 6.5.1 Farmer’s Canal...........................................................................................................6-4 6.5.2 20th Avenue.................................................................................................................6-5 6.5.3 Wagon Wheel Ditch..................................................................................................6-5 6.5.4 Valley Unit Park.........................................................................................................6-5 6.5.5 Willson - Cleveland and Willson - Garfield...........................................................6-6 6.5.6 Resort Drive...............................................................................................................6-6 6.5.7 North 11th Avenue.....................................................................................................6-6 6.5.8 I-90/East Main Interchange....................................................................................6-6 6.5.9 Rouse Avenue ............................................................................................................6-6 6.5.10 Auction and Feedlot.............................................................................................6-7 6.6 Other Problem Areas.........................................................................................................6-7 6.6.1 General Rehabilitation and Replacement...............................................................6-7 6.6.2 Rocky Creek ...............................................................................................................6-7 6.6.3 Bozeman Creek Freezing .........................................................................................6-8 6.6.4 Bozeman Creek Water Quality................................................................................6-8 6.7 Recommended Plan for Operation and Maintenance ..................................................6-9 6.7.1 Condition Assessment: Implementing a Rating System......................................6-9 6.7.2 Operation and Maintenance ..................................................................................6-10 6.8 Other Recommendations................................................................................................6-17 Tables Table 6.5-1 Summary of Recommendations................................................................................6-4 Table 6.7-1 Recommended Maintenance Frequency................................................................6-11 Table 6.7-2 Typical Maintenance Activities for Dry Ponds.....................................................6-12 6-i Bozeman Storm Water Facilities Plan 6-ii Table 6.7-3 Operation and Maintenance Program Summary..................................................6-16 Chapter 6: Recommended Plan 6.1 Introduction The purpose of this chapter is to provide storm water recommendations to the City of Bozeman. Section 6.2.1 describes the advantages and disadvantages of both the “Development-Based” and “Regional” approaches towards storm water mitigation, and the recommendation that the City pursues the formation of a Storm Water Utility is detailed in Section 6.2.2. Section 6.2.3 presents recommendations for improving the City’s existing storm water management policies. Section 6.3 provides solutions for areas of known flooding. 6.2 Regional versus Development Based Storm Water Management 6.2.1 Development-Based Approach The City currently uses exclusively individual, on-site detention/retention ponds and underground detention systems for individual subdivisions or developments. Large residential subdivisions typically use storm water detention ponds. Commercial properties or properties with high property values occasionally opt to use underground storm water detention systems which are more expensive to construct, but may allow some beneficial uses such as parking or play areas on top. The owner or developer finances the design and construction of individual facilities, and either the property owner or the property owners association is responsible for all operation and maintenance. However, the City remains ultimately responsible for these activities if the owner fails to carry out the necessary operation and maintenance by virtue of the new Phase 2 Rule. 6-1 On-site facilities cost more per acre to construct and maintain. There are disadvantages to individual site facilities. On-site facilities cost more per acre of development to construct and to maintain than regional facilities. Small facilities are more easily neglected because they are often out of sight and therefore out of mind. If neglected, a facility is less likely to achieve pollutant removal goals (set by the Phase 2 program) and may become an eyesore. One major limitation to the individual site approach is that it is triggered only by new development and redevelopment. In other words, if a section of the City does not redevelop, that area will not be upgraded to meet current standards. As the City faces the need to address water quality on a regional scale, in the Phase 2 permit, there may be a need to find a way to accommodate the need to retrofit those areas. With the City’s responsibilities at the regional level, a regional component to storm water management may be needed in the future. 6.2.2 Regional Approach In newly developing areas, properties prime for redevelopment, or in portions of the City that need to be retrofitted with storm water facilities in the future, the City may choose to install strategically located regional facilities within the watershed. If a regional pond is selected, it is advisable to use on-site controls for any industrial development within the regional pond drainage area. Regional facilities are not appropriate as in-stream facilities, but Bozeman Storm Water Facilities Plan 6-2 are appropriate for areas that are served by constructed storm water conveyance systems (i.e. pipes and gutters). Regional facilities are more cost-effective overall than individual systems because it is easier and less expensive to build a single large facility than several small ones. However, the City currently does not have staff to maintain large facilities. Regional facilities are most cost effective because it is easier and less expensive to build a single larger facility than several smaller facilities. Through careful planning, combined with the City’s water quality monitoring program, regional facility construction could be prioritized in the future to focus efforts on the most important water quality goal. Construction of regional facilities affords an opportunity to retrofit larger portions of the City that do not have storm water controls meeting current standards. Locating and obtaining property for these large facilities is a challenge due to urban planning considerations and property costs. The main disadvantage to regional facilities is logistics. Locating and obtaining property for these large facilities is a challenge due to urban planning considerations and property costs. In most cases, the City would provide capital construction funds for a regional facility, including the costs of land acquisition. However, if a downstream developer is the first to build, that person would be required to construct the facility and later be compensated by upstream developers for the capital construction costs and annual maintenance expenditures. Conversely, an upstream developer may have to establish temporary control structures if the regional facility is not in place before construction. One good approach is for the City to establish a funding source and use developer contributions to help repay as new projects within the basin are developed. 6.2.3 Recommended Approach The Phase 2 rule will likely (at some point) require the City to improve the water quality in its storm water discharges. As the Phase 2 program matures, the City will be moving forward with forming a utility and will establish a funding mechanism to address these needs. It would be most cost-effective and implementable to address water quality improvements and fix problems in existing, developed areas with regional facilities. At this point, moving to an all-regional approach is not practical. The City does not have the financial resources to create regional facilities in advance of development. Once it does, it could charge development for use of that facility as an alternative to requiring on-site retention requirements for those landowners. Once a utility is created, a hybrid regional/development-based approach may become more practical. 6.3 Storm Water Utility Implementation It is recommended that the City perform an implementation study to investigate the best means of developing a storm water utility. The study would lay the groundwork for the implementation of a storm water utility by answering the questions outlined in Chapter 3. The feasibility study should address: • How to best fund the storm water utility; Chapter 6: Recommended Plan 6-3 • How to calculate percentage by area of impervious cover; • How to define impervious cover; • Exemptions; • Credits; • Organization of the storm water utility; • A financial model to determine a storm water utility fee; • An operations and maintenance budget for the City; and • How to incorporate the study’s recommendations into the capital improvement plan. The implementation phase includes the following steps and services: • Help the City’s customer billing department develop a customer database; • Develop the ordinances to establish the storm water utility; and • Update the City’s tax parcel and storm utility fee databases. 6.4 Storm Water Design Policy For ease of review, it is recommended that the City require engineers and developers to submit storm water reports in a standardized format described in Chapter 3. Additionally, if hydrologic and hydraulic software is to be used in the design, City staff has expressed a preference for standardization of the software. After review of several products, StormNET, distributed by BOSS International, Ltd., was selected. For the Rational Method, a standardized spreadsheet should be used. An example of an Excel spreadsheet that could be used is included in Chapter 3. ▪ Unit Hydrograph Method: StormNET, distributed by BOSS International, Ltd., utilizes the SCS TR-55 method and standard City of Bozeman unit hydrographs to be generated from the Unit Hyetographs described in Chapter 2 (System Analysis). ▪ Rational Method: For estimating peak runoff in drainage basins of less than 100 acres and for detention facility sizing in drainage basins of less than 40 acres, the Rational Method will be acceptable, although the Unit Hydrograph method is preferred for detention routing. ▪ Hydraulic Calculations: If hydraulic software is used to design and size conveyance structures, the above-described StormNET software should be used. Alternatively (for example, if the Rational Method was used to obtain peak flow estimates), Flowmaster and CulvertMaster, both by Bentley Systems, Inc., should be used. Bozeman Storm Water Facilities Plan 6.5 Proposed Capital Facilities Solutions for Areas of Known Flooding Table 6.5-1 Summary of Recommendations Project Cost Storm Water Utility Feasibility Study and Implementation $60K Farmer’s Canal (county) $50 - $100K Valley Unit Park $50 - $80K Willson-Cleveland & Willson-Garfield $50K The City of Bozeman has experienced rapid population growth and development in the past few years, which impacts storm water runoff. During the existing system evaluation, several deficiencies or problem areas were identified; many of these are historic flooding locations in the City of Bozeman. Proposed solutions are detailed below and summarized in Table 6.5-1. 6.5.1 Farmer’s Canal Description: Farmer’s Canal diverts 250 cfs from the Gallatin River and irrigates about 11,000 acres. It flows from the Gallatin River through historic farmland areas in a 6 foot to 15 foot wide channel. As Farmer’s Canal flows closer to Bozeman and developed areas, the channel is further confined to a 3 feet to 5 feet wide channel. Farmer’s Canal is adjacent to residential development for several miles. Farmer’s Canal has insufficient capacity, particularly through developed areas. Some adjacent residential units are built at lower elevations than the canal. Numerous drainages cross the canal, some of which provide additional flow. Large storm water drainage areas also contribute flow. Resort Drive $1-5K General Rehab and Replacement $200K/ year Rocky Creek $10-20K Bozeman Creek Freezing $45K Bozeman Creek Water Quality $50K Farmers Canal Flooding Area Potential Solutions: • Divert flow upstream of the residential development, either into a new channel or storm drain. • Build a detention pond on the south side of College Street between 20th Ave. and 19th Ave. • Construct a series of small retention ponds along Farmer’s Canal. • Construct new control structure and divert less water from the Gallatin River. 6-4 Chapter 6: Recommended Plan • The Farmer’s Canal could be rerouted to drain down existing ditches to the north of Fowler Lane and Huffine Road. This would be part of a larger solution to reduce the amount of surface runoff entering the canal upstream of Fowler Lane. It is our understanding that the Canal Company may be open to this potential solution as they have indicated that they do not have irrigation users downstream of Fowler Lane. • Examine all cross drains to determine and address additional flow contributions. Cost: The cost to complete a detailed study of solutions is estimated to be $50,000. The likely long-term solution is to work in concert with the Farmer’s Canal to divert excess water into the series of drainages that the canal crosses through. A budget amount for implementation of a flow control diversion structure at each drainage crossing is $100,000. 6.5.2 20th Avenue Description: Irrigation and runoff flowing into the pipe south of Koch Street have backed up and flooded into Koch Street in the past. Potential Solutions: This problem may have been resolved when flows from the Farmer’s Canal were closed off (currently no water rights are being used). Monitor the area and re-assess the hydraulics of the pipe if the problem recurs. Cost: $0 20th Avenue Flooding Area 6.5.3 Wagon Wheel Ditch Description: This open ditch has insufficient capacity and unstable banks in some areas. This ditch is an overflow for the Farmer’s Canal and problems occur only during storm events that also impact the Farmer’s Canal. The irrigation district controls its operation. Potential Solutions: Either piping this ditch or increasing its capacity would allow for improved operation as an overflow to the Farmer’s Canal; however, it is recommended that any funds available for the project be utilized to solve the larger Farmer’s Canal issues. Cost: $0 6.5.4 Valley Unit Park Description: The homes along Meagher Avenue south of Durston Road and east of the park have experienced basement flooding. These homes are just east of a large detention pond that may elevate groundwater in the area. The existing pond outlet structure is a drop inlet and pipe from the pond bottom to the ditch along the west park boundary; it appears that the drop inlet quickly plugs during high runoff events. Potential Solutions: The City should replace the existing pond outlet structure with a new type and construct an emergency overflow pond outlet from the north end of the pond to the ditch along the west park boundary. 6-5 Bozeman Storm Water Facilities Plan Cost: $50,000 to $80,000 6.5.5 Willson - Cleveland and Willson - Garfield Description: The storm sewer system in this area apparently has insufficient capacity, which causes manhole lids to ‘pop’ open. This is likely due to undersized or clogged/damaged pipe. Potential Solutions: This drainage basin should be included in a detail study to determine the condition of the storm sewer system, the capacity of the existing pipe network, and the needed storm sewer capacity. Cost: $50,000 (Detailed study of basin) 6.5.6 Resort Drive Description: This is an area of newer development and the potential for an increased amount of impervious surfaces. There is high ground water in the area and an existing ditch that runs through the area. Potential Solutions: The City should require developers in the area to confirm that their development does not create drainage problems in the area. Cost: $1,000 - $5,000 (Review storm water plan and perform a site visit) 6.5.7 North 11th Avenue Description: Flooding problems are generally limited to the area near Durston Road. Durston Road improvements are currently under construction, which should alleviate the flooding that has been reported in the past. Potential Solutions: 2006 improvements should be monitored. Cost: $0 6.5.8 I-90/East Main Interchange Description: North of the eastbound on-ramp and across the frontage road from this area, flooding has occurred in the past due to poor drainage and/or inadequate infiltration. There has not been a problem recently, possibly due to interchange improvements made by the Montana Department of Transportation (MDT). Potential Solutions: Monitor the area and notify MDT if the problem recurs. 6-6 Cost: $0 6.5.9 Rouse Avenue Description: The storm water pipe along Rouse Avenue is about 90 years old (it was likely constructed in 1920). This pipe needs to be replaced and has failed in certain areas, forcing the City to perform emergency repairs. Potential Solutions: This pipe should be replaced with the Rouse Avenue reconstruction project. This project is currently under design and is an MDT project utilizing highway funds. Patching and emergency repairs will Storm Water Pipe Failure along Rouse Avenue. Chapter 6: Recommended Plan 6-7 continue to be conducted until the larger project moves forward. Cost: $0 6.5.10 Auction and Feedlot Description: Historically there has been beaver activity in the area, which has caused water to back up onto private property. This has been a concern in the past as the flooding came close to flooding a retention pond associated with a livestock auction yard. The auction yard has since vacated the property, which alleviates the critical water quality concern associated with this potential area of flooding. Potential Solutions: Upon annexation into the City or any proposed development project in the area, the City should require the applicant to investigate the problem in detail and provide a privately funded solution. Cost: $0 6.6 Other Problem Areas 6.6.1 General Rehabilitation and Replacement Description: The City’s storm water system condition is unknown; however, the age of the system and lack of routine maintenance or rehabilitation indicates that the system is in need of repairs. It is recommended that in the initial years of funding this portion of the storm water fund be utilized for condition assessment and study work. Potential Solutions: Implement rehabilitation and replacement program. Cost: $200,000 per year 6.6.2 Rocky Creek Description: Rocky Creek has been impaired from channel incisement, bank erosion, and sedimentation from development runoff and agricultural practices. Rocky Creek was 303(d) listed in 2002, and noxious weeds are becoming an increasing problem along the creek. Noxious weeds displace native plant communities (including endangered species), alter wildlife habitat, reduce forage for wildlife and livestock, and lower biodiversity. In some cases, noxious weeds increase soil surface runoff and sedimentation into streams, a process many scientists believe is the beginning of desertification. Potential Solutions: The City of Bozeman should team with the Gallatin County Weed Control District, the agricultural department of Montana State University, or other local groups to address the noxious weed problem along Rocky Creek. Rocky Creek is entirely outside the city limits. Mitigation of channel incisement should be addressed prior to city annexation of any areas within the Rocky Creek watershed. Cost: The cost for a noxious weed survey and one-time treatment will range from $10,000 to $20,000. Bozeman Storm Water Facilities Plan 6-8 6.6.3 Bozeman Creek Freezing Description: Bozeman Creek exhibits unusual characteristics every few years (the last event was the winter of 2006/2007) by freezing from the bottom of the creek bed upward as opposed to the more usual top-to-bottom freezing most creeks experience. It is believed that the speed at which Bozeman Creek flows prevents ice from forming except along the bottom of the creek bed where friction and turbulence allow the water to slow down long enough to freeze. Since the creek continues to flow atop this ice, the water level of the creek gradually rises as more ice accumulates on the bottom, causing flooding in some cases. The City installed eight wells to pump warmer groundwater into the creek during the coldest months. Potential Solution: It is not feasible to stop freezing along the entire length of the creek; therefore, the City’s solution should focus on the areas that pose the greatest safety hazard, such as bridges and culverts. In these specific areas, the City could attempt any of the following solutions: • Install additional wells for redundancy at Lamme and Rouse in Creekside Park. • Inject heated water into pre-drilled borings adjacent to stream. The existing system of injecting groundwater into the creek at specific locations could be expanded to incorporate a larger area. • Install an air-bubbler system. These have been used successfully at dams where ice forming on locks and gates can cause severe problems. The air-bubbler system consists of submerged diffuser pipes installed on the channel bed and side slopes. Typically, a 100- psi, 750-cfm compressor is used to supply air. • Mount high-density polyethylene sheets over the concrete surfaces at risk of icing over (bridge abutments, piers, concrete culverts). Laboratory tests have shown that ice will grow on these sheets just as it does on steel or concrete. However, it takes 30 times less force to knock ice off HDPE than concrete, and the ice tends to come off cleanly. HDPE sheets typically have dimensions of 4 feet by 8 feet by 0.5 inches and weigh 80 pounds each. Cost: Air bubbler - $15,000. HDPE - Approximately $30,000, assuming five locations totaling 20,000 square feet. Estimated cost for well construction $10,000 - $50,000 depending on DNRC requirements. 6.6.4 Bozeman Creek Water Quality Description: Bozeman Creek is classified as impaired by MDEQ due to decreasing fish habitat and populations, fish passage issues, channelization, and flooding problems. Bozeman Creek flows into the East Gallatin River, to the Gallatin River, and eventually to the Missouri River. The creek runs through downtown Bozeman, where it collects the majority of the downtown area runoff. Nutrients in Bozeman Creek come from a host of upstream sources, including septic systems, confined livestock, natural inputs from Forest Service land, and lawn fertilizers. However, no water quality data is available for Bozeman Creek reaches on County or U.S. Forest Service Land. Chapter 6: Recommended Plan Potential Solutions: It is recommended that a group of Bozeman Creek stakeholders conduct a study of Bozeman Creek to determine specific improvements that could be implemented. These improvements could include the following: • Revegetation; establish a riparian corridor. • Identify and enforce setbacks for future development. • Inspect all outfalls to Bozeman Creek and identify improvements including energy dissipaters, trash racks, etc. • Identify and address any fish passage issues. Cost: The cost for studying Bozeman Creek and performing preliminary design of identified solutions would likely range from $20,000 - $50,000, depending upon the scope of the project. This project could be funded by a Water Resources Development Act Program 595 (WRDA) funding, similar to the project to improve Grant Creek in the Missoula area. 6.7 Recommended Plan for Operation and Maintenance 6.7.1 Condition Assessment: Implementing a Rating System Integration of infrastructure condition information will enable the City to make decisions that are more informed. The condition of the existing storm water system is generally unknown. Pipes, catchments, drains, and other storm water infrastructure components are only inspected when problems are reported. A quantitative rating system would enable the City to better manage existing storm water infrastructure with regard to operation, maintenance and replacement. Because storm water systems and infrastructure are installed by both public and private entities (municipalities, homeowners associations, developers, agricultural producers, etc.), operation and maintenance (O&M) schedules and responsibilities often fall into a grey area. When that occurs, the City is forced into a reactionary position, responding to problems as opposed to performing regular maintenance using a tracking and rating system. Numerous tracking and rating systems are available; a detailed description of one system is presented in Appendix E (Infrastructure Rating System Alternatives). This system could be implemented by modifying the Excel spreadsheet that the collection system staff uses to create a numeric rather than qualitative record. The City currently performs video inspections of its sewer system. It is recommended that the storm drain system be incorporated into this video inspection program, and a maintenance schedule should be created which allows the City to inspect a portion of the storm drain system each year. The existing City crews are not adequate to take on this additional burden. Funds from the storm water utility should be allocated to provide staff and equipment. During these 6-9 Bozeman Storm Water Facilities Plan 6-10 inspections, physical storm water data should also be collected and incorporated into the storm water model. In summary, the advantages of a tracking and rating system to the City of Bozeman include: • Providing an improved inventory of the existing system; • Streamlining the prioritization and scheduling of maintenance and inspection; • Providing documentation for any legal action; • Relating the effectiveness of existing components to their long-term performance; • Providing a cost estimating mechanism; and • Identifying future projects for retrofitting. Whenever a noticeable defect in the pipe condition is identified during the TV inspection, a code should be assigned indicating the type and severity of the defect. For consistency in inspection and rating, specific storm water utility personnel should be assigned to develop, test and refine a rating system that can be carried through as staff turnover occurs. Appendix E (Infrastructure Rating System Alternatives) describes several alternative rating systems. 6.7.2 Operation and Maintenance Current Maintenance Program At this time, maintenance of the existing storm water system is highly dependent on staff work load. Maintenance of storm water infrastructure is a secondary priority for maintenance personnel. A formal storm water system maintenance plan and inventory has not been developed and minimal maintenance is performed. Maintenance Responsibility Storm water infrastructure located within street right-of-way and on City property is the responsibility of the City. Infrastructure located on private property is typically the responsibility of individual homeowners or homeowners associations. Inventory of Facilities The existing storm water system consists of a complex system of drainage basins, swales, roadside ditches, pipes, catch basins, manholes, detention basins and treatment systems. The City is experiencing significant growth, which is expected to result in expansion of storm water infrastructure. Storm water system maintenance is necessary to ensure the reliability and dependability of the system, alleviate flooding, and enhance water quality in receiving streams. To effectively develop an operation and maintenance program for storm water facilities, an inventory of existing facilities must be developed and updated on a regular basis as the system is expanded. The City should require that engineers or developers submit all new storm water infrastructure information to the City in GIS with coordinates, inverts, and elevations according to the City of Bozeman datum and state plane coordinates. The desired information is described in Chapter 1 (Existing System Inventory). Chapter 6: Recommended Plan 6-11 Inspection and Maintenance Frequency The condition of drainage facilities needs to be assessed on a regular basis. Inspection and required maintenance frequency is greatly dependent on land use, climate, street maintenance practices, etc., and will vary regionally and by community. Table 6.7-1 shows recommended maintenance frequency. Careful and consistent inspection and record keeping will provide the information the City needs to develop a maintenance schedule that ensures storm water infrastructure is properly maintained and in good working order. Creating a funding mechanism to fund staff positions to perform these activities will aid in implementation. Table 6.7-1 Recommended Maintenance Frequency Facility Recommended Maintenance Frequency Maintenance Requirements Pipelines Once per three years Inspect and jet rod sediment and debris from pipe Catch Basins Once per two years Vacuum pump sediment and debris from sump Manholes Once per three years Inspect and clean sediment and debris from invert Ditches Once per year Mow, clean and remove sediment as needed Ponds Once per year Mow, remove debris from inlet/outlet structures and remove sediment as needed Proprietary Treatment Systems As recommended by the manufacturer Replace filters Swales Once per three years Mow, clean and remove sediment as needed Recommended System Maintenance The following discussion provides general maintenance recommendations for typical storm water facilities. These recommendations apply to those facilities that might be constructed in the future and facilities that are currently in place in Bozeman. Detention and Retention Basins Maintenance of detention and retention basins is essential if the facilities are going to operate as originally designed. Ponds should be inspected on a regular basis, especially prior to and during times of predicted or known rainfall and snowmelt. Inlet and outlet structures should be cleared of debris whenever it is discovered through inspections. Attention should be given to sediment accumulation. If sediment accumulation exceeds 25% of the facility’s Bozeman Storm Water Facilities Plan 6-12 design depth, it should be removed. Grass should be mowed and vegetation trimmed where appropriate. Table 6.7-2 outlines typical maintenance practices recommended for pond facilities. Table 6.7-2 Typical Maintenance Activities for Dry Ponds Activity Schedule Note erosion of pond banks or bottom Semiannual inspection Inspect for damage to the embankment Monitor for sediment accumulation in the facility and forebay Examine to ensure that inlet and outlet devices are free of debris and operational Annual inspection Repair undercut or eroded areas Mow side slopes Manage pesticide and nutrients Remove litter and debris Standard maintenance Seed or sod to restore dead or damaged ground cover Annual maintenance (as needed) Remove sediment from the forebay 5- to 7-year maintenance Monitor sediment accumulations, and remove sediment when the pond volume has been reduced by 25% 25- to 50-year maintenance Buried Tanks or Vaults Buried tanks and vaults constructed for storm water detention should be inspected annually for accumulation of sediment and debris. Facilities should be designed for maintenance access and easy removal of sediment. Sediment should be removed when the tank or vault’s sediment storage volume has been reduced by 25%. Infiltration Basins and Drain Fields Several recent developments have requested use of underground infiltration basins in the City. An example design is included in the BMP manual. Routine maintenance of infiltration basins and drain fields is extremely important. The pretreatment grit chamber should be checked at least four times per year and after major storm events. Sediment should be cleaned out when the sediment depletes more than 10% of the available infiltration capacity. This can be done manually or by vacuum pump. Inlet and outlet pipes should also be inspected at this time. The infiltration drain field should contain an observation well that can provide information on how well the system is operating. It is recommended that the observation well be monitored daily after runoff-producing storm events. If the infiltration Chapter 6: Recommended Plan drain field does not drain after three days, it usually means that the drain field is clogged. Once the performance characteristics of the structure have been verified, the monitoring schedule can be reduced to a monthly or quarterly basis. Runoff Control Structures Runoff control structures must be kept clear of debris and obstructions in order to operate effectively. Control structures should be inspected after major storm events and in the spring prior to runoff from snow melt and spring rains. Debris should be removed from overflows, bypasses, and spillways anytime it is observed. Catch Basins Inlet grates should be kept clear of debris and sumps should be cleaned on a regular basis to prevent silt accumulation in downstream piping. Catch basins should be inspected in the spring prior to snow melt and spring rains. Sanding of streets will increase the amount silt and grit accumulation in catch basin sumps and may require more frequent cleaning on streets that are sanded on a regular basis (i.e. bus routes). Catch basins should also be inspected in the autumn after leaves have fallen from trees to ensure that inlet grates are not plugged. Bioretention Swales Bioretention swales utilize soils and plants to infiltrate and remove pollutants from storm water runoff. Recommended maintenance for a bioretention area includes inspection and repair or replacement of the treatment area components. Trees and shrubs should be inspected twice per year to evaluate their health and remove any dead or severely diseased vegetation. Diseased vegetation should be treated as necessary. Pruning, weeding, and periodic mulch replacement is recommended. Application of an alkaline product, such as limestone, is recommended once or twice per year to counteract soil acidity resulting form slightly acidic precipitation and runoff. Bioretention basins provide additional water quality treatment to reduce non-point source pollution from existing storm water runoff at the site. Oil/Water Separators Oil/water separators should be inspected after every major storm event. At a minimum, accumulated oil and sediment should be removed at the beginning of each wet season. The required maintenance frequency will be site specific due to variations in sediment and hydrocarbon loading. Maintenance should include clean out, disposal of the sediments, and removal of trash and debris. Since residuals may contain hydrocarbons, they may require disposal as hazardous waste. 6-13 Bozeman Storm Water Facilities Plan Conveyance Piping and culverts should be cleaned on a regular basis to prevent blockage and subsequent upstream flooding. Maintenance frequency will be dependent on variations in sediment and debris loading. The effectiveness of catch basins in removing sediment and debris prior to entering piped systems plays an important role in minimizing the frequency of cleaning pipes. A good catch basin maintenance program can greatly minimize the frequency of pipe cleaning. Piping should be inspected when catch basins are inspected to determine the need for cleaning. Pipes can be cleaned by jet rodding equipment and sediment removed at manholes and catch basins with a vactor truck. 6-14 Proprietary Treatment Systems Proprietary Treatment Systems Include: Stormceptor™ StormFilter™ Vortechnics™ The City of Bozeman storm water system currently accepts the use of several proprietary and custom designed treatment systems, including Stormceptor™, StormFilter™ and Vortechnics™. These systems have proven effective in removing target contaminants prior to discharge to receiving water bodies provided proper maintenance is performed. Each manufacturer’s recommended operation and maintenance procedures are outlined below. Other manufacturers are available and have their own similar maintenance requirements. In all cases where proprietary storm water quality treatment systems are installed, the City or other responsible party should follow the manufacturer’s operation and maintenance recommendations to provide the most effective storm water treatment possible. Stormceptor™ - When sized correctly, Stormceptor® should be maintained annually, after a spill event, or if oil and sediment levels exceed recommended maintenance volumes. Maintenance should be performed once oil and sediment reach the recommended depths. The depths at which maintenance should be triggered can be found on the Stormceptor website http://www.stormceptor.com/frequency.php. The Stormceptor® treatment chamber is a confined space and should only be entered by properly trained, equipped and qualified staff as identified by local Occupational Safety and Health Regulations. Stormceptor® units should be inspected every six months and cleaned when the sediment level reaches 15% of total storage volume. If regular inspections are not conducted, Stormceptor® units should be cleaned once a year. Stormceptor® units should also be inspected following a spill event. All oil captured by the Stormceptor® should be removed. Maintenance is typically performed using a vacuum truck. StormFilter™ - Inspection and maintenance of the StormFilter™ treatment system is typically annual but is dependent on the pollutant load and rainfall characteristics at each site. Maintenance includes removing the cartridge hood and either manually or with a vactor truck removing accumulated trash, debris, and sediments from the vault then replacing the filter cartridge with a recharged cartridge. Vortechnics™ - The Vortechnics™ system should be inspected every six months but is dependent on the pollutant load and rainfall characteristics of each site. Accumulated sediment is evacuated through the manhole over the grit chamber with a vactor truck. If maintenance is not performed frequently enough, sediment may accumulate outside the grit chamber. If this is the case, it may be necessary to pump out all chambers. All chambers Chapter 6: Recommended Plan 6-15 should be inspected during each maintenance event to prevent sediment buildup in those areas. Annual Operation and Maintenance Program Table 6.7-3 summarizes the recommended operation and maintenance program and associated annual costs for the City’s storm water facilities. Implementation of this maintenance program will require a crew of three for approximately 112 days, a crew of two for 6 days and single person crew for an additional 27 days each year. It will also require the use of a vactor truck for approximately 112 days, a backhoe and dump truck for approximately 6 days and a mower for approximately 27 days per year. Additional staff time will also be needed for updating inventory and keeping maintenance records. Additional costs include replacement filters for treatment systems and costs associated with debris, sediment, and oil disposal. Filter cartridge replacement costs are approximately $3,300 per year for a single treatment unit. The Center for Watershed Protection is developing a set of web-based tools to help communities develop a state-of the art maintenance program. Once this program is developed, storm water practitioners will be able to download readily usable maintenance forms, updated maintenance cost data, ordinances, and other key elements of a good program. The City of Bozeman could benefit from this type of assistance rather than creating its own customized maintenance program. Record Keeping To adequately develop a maintenance program for the City of Bozeman storm water system, detailed records should be kept for inspection and maintenance activities performed. All facilities including pipe, manholes, culverts, catch basins, treatment systems, ditches, swales and detention facilities should be incorporated into the program. Bozeman Storm Water Facilities Plan 6-16 Table 6.7-3 Operation and Maintenance Program Summary Facility Units Frequency (times per year) Daily Production Crew Size Equipment Annual Man Days Annual Labor Cost1 Annual Equipment Cost2 Total Cost Detention Pond 1 1 1 3 Vactor Truck 1 $200 $500 $700 Vegetation Control 1 2 1 Mower 6.5 $1,300 $1,950 $3,250 Sediment Removal 0.2 1 2 Backhoe/dum p truck 5.2 $1,040 $3,640 $4,680 Catch Basins 500 0.5 15 3 Vactor Truck 50 $10,000 $25,000 $35,000 Manholes 300 0.5 15 3 Vactor Truck 30 $6,000 $15,000 $21,000 Roadside Ditches 5 miles Debris Removal 1 0.5 1 Dump Truck 10 $2,000 $3,500 $5,500 Mowing 1 0.5 1 Mower 10 $2,000 $3,000 $5,000 Pipe 57,620 lineal feet 0.33 2,500 3 Vactor Truck 22.8 $4,560 $11,400 $15,960 Treatment Systems Clean-out 5 1 2 3 Vactor Truck 7.5 $1,500 $3,750 $5,250 Filter Replacement 1 0.25 2 3 Vactor Truck 0.375 $75 $188 $263 Mowing 1 1 2 1 Mower 0.5 $100 $150 $250 Sediment Removal 1 0.2 1 2 Backhoe/dum p truck 0.4 $80 $280 $360 Video Inspection 1 NA NA 2 Video truck (use sewer crew truck) 500 $50,000 $5,000 $65,000 Totals 143.4 $28,855 $68,358 $162,213 1Based on $200 per day 2Based on $300 per day for a mower, $700 per day for a backhoe/dump truck and $500 per day for a vactor truck Chapter 6: Recommended Plan 6-17 6.8 Other Recommendations Mapping Database Recommendations The following recommendations describe a phased approach to systematically developing and maintaining an accurate storm drain facilities map and GIS database. This approach seeks to complete the most beneficial tasks first. • Step 1: Develop Database Maintenance Procedures Develop and implement procedures to ensure that any new construction associated with the storm drain system is verified and added to the database and develop a standardized junction data sheet similar to Error! Reference source not found. for junction inspections. The new database maintenance procedures should require that database updates also include other new information, such as new data from drainage master plans or studies, outfall location surveys, and modification, abandonment or removal of existing storm drain facilities. • Step 2: Fully Incorporate the Grid Maps Use existing information, particularly the highlighted grid maps of this Facilities Plan, to bring the database to a level of completeness exceeding the existing grid maps, thus making the grid maps obsolete. • Step 3: Add Open Channels Use aerial photography to revise the alignment of open channels already in the database, and add to the database other open channels that are visible on the aerial photos. • Step 4: Update Poorly Mapped Areas of the Database Make document-based improvements to the map and database in areas where the mapping is substantially incomplete. These areas can be identified by comparing the new storm drain map to the 2004 aerial photos to locate recently developed areas. • Step 5: Incorporate Remaining Documentation-Based Data Complete the input of data from the City’s files for areas or subdivisions not completed in Step 4, and obtain topographic mapping based on the 2004 aerial photos. Phase 2 NPDES Recommendations It is recommended that the city continue on its current path with Phase 2 NPDES described in chapter 4. Critical next steps include: • Executing Memoranda of understanding with co-permittees • Consider adding a local storm water permit program • Move forward with the mapping task identified in MCM #3 Bozeman Storm Water Facilities Plan 6-18 • Begin drafting ordinances in 2009 (or create a single ordinance) to address requirements, as adoption of an ordinance can be time consuming. Bozeman Storm Water Facilities Plan Appendix A: Existing System Inventory Data Appendix A: Existing System Inventory Data A.1 Summary This storm drain system inventory is a compilation of existing data in the form of an Excel spreadsheet database convertible to the City’s GIS program, Arcview. The data is also presented graphically on a new Storm Drain Map of the study area. The study area encompasses the entire grid area covered by the index sheet of the City’s existing storm drain grid maps, referred to as “Grid Maps” throughout this document. Structures surveyed by the City using GPS equipment have been linked together in Arcview based primarily on the Grid Maps, but also using miscellaneous subdivision drawings, SID drawings and other sources that were provided by the City for this study. A product of this report that will be important to future mapping improvements is a highlighted set of Grid Maps. The maps have been highlighted to identify information that needs to be transferred to the new database before the Grid Maps can be retired as obsolete drawings. Once the point is reached where the Grid Maps have been fully replaced, many other types of improvements can be made to the new Storm Drain Map and database. A start would be to incorporate the many subdivision and SID drawings that were not provided for this study, and to locate existing culverts and open channels using aerial photography. Several options are presented describing these and other potential, incremental improvements to the map and database. Final recommendations are presented as a phased approach to improving the map and database. As a minimum, it would be desirable to bring the new Storm Drain Map and database to a point of completeness where the printed Grid Maps were no longer necessary. The steps required to meet this minimum goal are presented, as are the next logical steps that could be completed to further improve the database. As funding becomes available, additional efforts, including field investigations and surveying of some or all of the study area, will continue to improve the completeness and reliability of the database. The Excel spreadsheet database has been set up not only to accept data input, but to also track the level of accuracy associated with virtually any piece of data for any of the connecting structures (junctions) or conveyance structures (links). The junction spreadsheet includes formulas that make use of the most reliable data to calculate pipe inverts. The Excel spreadsheets can be searched or sorted by any column, as a tool to aid in prioritizing future data collection efforts. The formulas make decisions based on the data sources entered, and automatically use the best available data while keeping track of the data sources used and the resulting level of accuracy for each structure (junction or link). As data entry progresses, the improvements to accuracy and completeness will be evident for each junction. The new Storm Drain Map and GIS database will become an important tool for overall management of the City’s storm water system. A.1.1 Overview The City of Bozeman is served by a storm drainage system made up of piped storm drain networks connected by open channels. Currently, the single most complete source of locations and sizes of storm drainage facilities is the City’s set of storm drain grid maps, referred to as “Grid Maps” throughout this document. Storm drainage facilities also appear on plat maps, on a 1980 drainage inventory/mapping project, and on record drawings from subdivisions, Special Improvement Districts (SIDs) and other construction projects. A-1 Bozeman Storm Water Facilities Plan The City has recently set up a GIS-based system for compiling storm drainage data. Prior to this study, the GIS database contained approximate coordinates and grate/rim elevations of 2,387 drainage structures, primarily manholes and catch basins. The purpose of this storm drain inventory is to gather existing information on the City’s GIS-identified and other existing drainage structures, and organize it into a GIS-accessible format that simplifies future data input. The information gathered in this task will help determine priorities for future data collection efforts, and will become an important tool for overall management of the City’s storm water system. A.1.2 Study Area Description The study area, identified on Figure 1.1-1 Study Area, completely encompasses the City Limits and surrounding areas. Montana State University (MSU) property was excluded from the study area, and will be covered in a separate document. Connection points to the City’s storm drain system are assumed to occur at the MSU property line. The Bozeman area generally drains from south to north, with a major exception being the influence of agricultural irrigation ditches. During the growing season, the irrigation ditches draw water from natural drainages and convey flows across sub-basins, with high runoff typically overflowing into the historic/natural drainages at the control structures. The effect and management of the irrigation ditches is not covered in this study. A-2 Appendix A: Existing System Inventory Data A.1.3 Basis of System Inventory This storm drain system inventory compiles data from six existing sources: • The City’s existing set of storm drain grid maps; • Storm drain structures that have been located by City staff using GPS equipment; • Design drawings and record drawings from construction projects; • The City’s existing set of plat maps, showing hand-sketched storm drain structures; and • A 1980 storm drainage inventory/mapping project. • A 2005 survey effort by City staff At this time, the Grid Maps represent the City’s most complete and accurate picture of its storm drain system. Structures appearing on one of the other five data sources but not on the Grid Maps were hand-drawn in and highlighted on a clean set of Grid Maps. Structures on the Grid Maps whose locations are not currently in the City’s GIS database are also highlighted. A set of the highlighted Grid Maps has been included, under separate cover, to indicate the general locations of these facilities. A.1.4 Deliverables The deliverables for this study are listed below. The “junction spreadsheet” lists manholes, catch basins, curb inlets, detention basins, etc., and the “link spreadsheet” lists connecting conveyance structures such as pipes and ditches. • Junction spreadsheet (printed copy, Appendix A-1); • Link spreadsheet (printed copy, Appendix A-2); • Storm Drain Map (set of six full-size, 24” x 36” drawings, in map pockets); • Highlighted set of the City’s existing storm drain grid maps • Arcview files; • Excel file for the Junction and Link spreadsheets; and • AutoCAD file for the new Storm Drain Map. A.2 Existing GIS Database A.2.1 General The City provided a GIS database of the storm drain system in April 2004. The database was compiled using GPS equipment to locate 2,387 data points. Each data point represents a different storm drain point (connection) structure, referred to hereinafter as a “junction.” Each point in the database included a grate/rim elevation, northing/easting coordinates, and an indication whether the point was a manhole or a catch basin. In August 2004, the City created “unique ID numbers” for each data point as described in Section A.2.3 below and re-sent the GIS database to MMI. The drainage facilities represented by the database are spread throughout the City, primarily in the area bracketed by Ferguson Road, Oak Street, Kagy Boulevard and Highland Boulevard. A-3 Bozeman Storm Water Facilities Plan A.2.2 Accuracy Plan locations (coordinates) of the City’s database are accurate to within several feet. This level of accuracy should be adequate for general mapping purposes, but relative positions between some clustered curb inlets appears to be inconsistent with the locations and number of junctions shown on the Grid Maps. This makes it difficult to determine which GPS point goes to which junction shown on the Grid Maps, thus increasing the need for field investigation. The GPS-generated northings and eastings were converted to State Plane coordinates by the City, and are included on the junction spreadsheet (Appendix A-1). Elevations provided by GPS are to the height of the receiver prism, and do not account for the drop to ground elevation. City staff suggests that this drop was about 6 feet, but without documented instrument heights at the time of the work, the actual instrument heights and variation is unknown. In addition, cross-checks and day-to-day calibration to established vertical datum benchmarks was not documented. Therefore, the elevations provided by GPS (and included in the junction spreadsheet) should be considered raw data at the height of the prism, needing adjustment and/or field-verification. GPS elevations were obtained from the City in meters and were then converted to feet. City staff estimates the GPS elevations to be accurate to plus or minus a few feet. Ultimately, all elevations should correlate directly to City of Bozeman vertical datum. For hydraulic modeling purposes, an accuracy of ± 0.01 feet would be desirable, but ± 0.1 feet would also be acceptable. A.2.3 Unique ID Numbers After data entry for this Facilities Plan began in April 2004, it was discovered that the identifying point numbers attributed to each structure were not unique and would re-generate when running the Arcview GIS program. Therefore, it was decided to set up a “unique ID number” for each structure as a separate field, rather than using the Arcview-created point numbers. This was done in August 2004. The “unique ID number” is referred to as the “Junction Number” on the junction spreadsheet (Appendix A-1) and the “Link Number” on the link spreadsheet (Appendix A-2). The junction number” and “link number” will remain associated with a unique junction or link and will not change; they should not be confused with the identifying numbers assigned to the junction or link by Arcview. A.3 Existing Drawings A.3.1 Storm Drain Grid Maps The City’s current storm drain map is a set of quarter-section (160-acre) grid maps centered on the City limits and including outlying areas. These maps are currently the City’s best representation of the existing storm drain facilities. The maps were originally set up on a grid system going from sheet A-0 at the northeast corner to sheet N-11 at the southwest corner, for a total of 168 grid squares covering 42 square miles. Recently, east-west rows 50 and 51 were added north of row 0, so the current coverage area is 196 grid squares, or 49 square miles. A-4 Appendix A: Existing System Inventory Data A Grid Map Index (Figure 1.3-2) identifies the currently mapped areas. The storm drain mapping done to date by the City appears on 43 Grid Maps, or about 22 percent of the current grid coverage area. Additional grid maps may be created as the City grows. The Grid Maps show approximate, graphical locations of pipe networks and open channels. Text information on the Grid Maps includes some of the larger pipe sizes, shapes and materials, and some SID numbers without any indication of the limits of the SID. Detention ponds and other facilities such as grease traps may also be indicated by text on the Grid Maps. The text information is incomplete, and may not agree with record drawings or other data sources. A.3.2 Subdivision Drawings Table 1 lists the subdivision drawings that were provided by the City for this mapping project, and cross-references each subdivision to the Grid Map number(s) on which it is located. Drawings for 35 different subdivisions, or phases thereof, were provided. The drawings provided are partial copies of construction plan sets, and may not identify all storm drain facilities constructed with that project. Most of the drawings are marked “as-built” or “record drawing.” A subdivision map provided by the City (City of Bozeman Subdivisions, dated 11/13/03) lists 398 subdivisions, about 290 of which are within the 2003 City Limits shown on the map. Another list of subdivisions supplied by the City totals 326 subdivisions. In either case, the 35 subdivisions used for this mapping project and listed in Table 1 are only about 11 or 12 percent of the assumed total number of subdivisions within the City. The use of additional subdivision drawings could improve the completeness and/or accuracy of this storm drain system inventory. Table 1 Subdivision Drawings Used No. Grid Map No. Abbreviation Subdivision Name Year Built 1 C-5* KM Kamp Minor Subdivision 1998 2 D-1* H The Headlands 2002 3 D-5 ESC Ellis Street Crossing 1992 4 D-5 HB Highland Blvd./SID 647 1985 5 D-7 HBR Highland Blvd. Reconstruction 1996 6 E-0/1 BCS, Ph 1 Bridger Creek Subdivision, Phase 1 1995 7 F-0* BCS, Ph 2 Bridger Creek Subdivision, Phase 2 1996 8 E-0 BCS, Ph 3 Bridger Creek Subdivision, Phase 3 1998 9 F-9 WMS, Ph 1 West Meadow Subdivision, Phase 1 2002 10 G-2/3 EAI Eleventh Ave. Improvements 2002 11 G-9/10* WFS Westfield South, Phase 3 2001 12 H-3 BSD Blackmore Storm Drain 1994 13 I-0* GCS Gallatin Center Street & Storm Plans 1999 A-5 Bozeman Storm Water Facilities Plan A-6 Table 1 Subdivision Drawings Used No. Grid Map No. Abbreviation Subdivision Name Year Built 14 G-2 WAL Bozeman, Montana Wal-Mart 1993 15 I-1* LCC Lewis & Clark Commercial Subdivision 2003 16 I-3 AS, Ph 1 Annie Subdivision/SID 649 1985 17 I-3 BS, Ph 2 Brentwood Subdivision, Phase 2 1995 18 I-3 CA, Ph 2 Castlebar Apartments, Phase 2 2003 19 I-6 YC, Ph 2 Yellowstone Center, Phase 2 2000 20 J-0 CCS, Ph 1 Cattail Creek Subdivision, Phase 1 2002 21 J-3 HCS, Ph 1 Harvest Creek Subdivision, Phase 1 1999 22 J-3 HCS, Ph 2 Harvest Creek Subdivision, Phase 2 2000 23 J-3 HCS, Ph 4 Harvest Creek Subdivision, Phase 4 2001 24 J-4 WS Willow Subdivision 1996 25 J-5 BMS Babcock Meadows Subdivision 1995 26 J-5 BIH, Ph 2 Bozeman Interfaith Housing, Phase 2 1997 27 K-4 BPE Bridger Peaks Estates Subdivision 1990 28 K-4 CS Cascade Subdivision 1992 29 K-5 MU Master Utility (Fallon St. & Private Dr.) 1994 30 K-5 NP Nelson Property 1996 31 K-5 VCBP Valley Commons Business Park 1996 32 K-5 VCS Valley Creek Subdivision 1995 33 L-1* BME Baxter Meadows Estate Homes 2004 34 L-4 VWS Valley West Subdivision 2002 35 L-5* SCV The Spring Creek Village Resort 2001 * indicates Grid Maps that do not exist in the City’s files A.3.3 Special Improvement District (SID) Drawings Drawings for 49 different SIDs were provided for this mapping project. The drawings provided were taped-together, 11-inch by 17-inch photocopies of construction plan sets that may not identify all storm drain facilities constructed with that SID. Some of the drawings were marked “as-built” or “record drawing,” but most were not. Some of the pertinent information such as junction inverts, pipe lengths and slopes, etc., was not shown on the drawings and may need to be field verified. Assuming the SIDs are numbered consecutively, Table 2 indicates that there would be a minimum of 649 SIDs. The 49 SIDs used for this mapping project and listed in Table 2 (SID Drawings Used), and include less than 8 percent of the assumed minimum total Appendix A: Existing System Inventory Data number of SIDs. The use of additional SID drawings could improve the completeness and/or accuracy of this storm drain system inventory. Table 2 SID Drawings Used No. Grid Map No. SID No. Year Built No. Grid Map No. SID No. Year Built 1 D-5 647 26 G-4 427 2 E-3 115 1916 27 G-4 433 3 E-4 585 28 G-4/5 98 1915 4 E-4 613 29 G-4/5 208 1920 5 E-4/5 488 30 G-4/5 353 6 E-4/5 190 1920 31 G-5 145 1916 7 E-7 605 32 G-5 146 1917 8 F/G-4 408 33 G-5 180 1919 9 F-4 466 34 G-5 305 1937 10 F-4/5 75 1914 35 G-5/6 85 1915 11 F-4/5 104 36 G-6 239 12 F-4/5/6 55 1912 37 G-6 293 1935 13 F-5/6, G-5/6 99 38 G-6/7 487 14 F-6 320 1938 39 G-7 537 15 F-6 428 40 G/H-7 538 16 F-6 449 41 G-8 553 17 F-6 455 42 G-8 594 18 F/G-6 227 1921 43 H-3/4 444 19 F/G-6 228 44 H-3/4 547 20 F-7 434 45 H-4 469 1966 21 F-7 463 1966 46 I-3 649 1985 22 F-7 512 47 I-4 520 23 F/G-7 447 48 I-5 562 24 F-8 531 1973 49 K-4/5 625 25 G-3 535, 536 A-7 Bozeman Storm Water Facilities Plan A.3.4 Plat Maps Table 3 lists the 56 plat maps that were provided by the City for this mapping project, and cross-references each plat map to the Grid Map number(s) on which it is located. Overall plat map coverage area is shown on Figure 1.3-2 Grid Map Index. The plat maps identify some storm drain facilities and associated information. The storm drain information shown on the plat maps was hand-sketched in as supplemental information, and is likely to be incomplete. However, it is possible that some of this information was obtained in the field after construction; therefore it has some value in identifying facilities that may exist but may not show up on the Grid Maps. The plat maps are on a grid system that suggests there may be additional plat maps. Overall plat map coverage area is shown on Figure 1.3-1 (Grid Index Map). The use of additional plat maps could improve the completeness and/or accuracy of the storm drain inventory that is provided in this Facilities Plan. Table 3 Plat Maps Used No. Grid Map No. Plat Map No. No. Grid Map No. Plat Map No. 1 E-3 J-9 29 F-4 P-14 2 E-3 K-8 30 F-4, F-5 P-15 3 E-3 K-9 31 F-5 M-16 4 E-3, F-3 L-8 32 F-5 M-19 5 E-3, F-3 L-9 33 F-5 N-17 6 E-3, E-4 J-12 34 F-5 O-16 7 E-3, E-4 K-12 35 F-5 O-19 8 E-4 H-15, I-15 36 F-5, G-5 P-17 9 E-4 I-12 37 F-5, G-5 P-19 10 E-4 I-14 38 F-5, F-6 N-19 11 E-4 K-14 39 F-6 O-21 12 E-4 K-15 40 F-6 P-23 13 E-4, F-4 L-12 41 F-6, G-6 Q-21 14 E-5 I-16 42 F-6, G-6 Q-23 15 E-5 K-16 43 G-4 R-14 16 E-5 L-17 44 G-4 T-14 17 E-5 L-19 45 G-4 T-15 18 F-3 N-8 46 G-5 R-15 19 F-3 N-10 47 G-5 R-16 20 F-3 O-8 48 G-5 R-19 21 F-3 O-10 49 G-5 S-17 22 F-3 P-8 50 G-5 S-19 A-8 Appendix A: Existing System Inventory Data A-9 Table 3 Plat Maps Used No. Grid Map No. Plat Map No. No. Grid Map No. Plat Map No. 23 F-3 P-10 51 G-5 T-17 24 F-4 N-12 52 G-5 T-19 25 F-4 N-14 53 G-6 R-21 26 F-4 N-15 54 G-6 R-23 27 F-4 O-12 55 G-6 R-23 28 F-4 P-12 56 G-6 T-21 A.3.5 Photo-Based Drainage Maps The City’s records include a set of aerial photo-based maps to which drainage information was added. The maps were prepared in 1980 by Thomas, Dean & Hoskins. Aerial photography supplied by Professional Consultants, Inc. was used as a base layer for the mapping. The map set is a total of 30 drawings at a scale of 1 inch = 200 feet, covering most of the Facilities Plan study area. Total coverage area is shown on Figure 1.3-1 Grid Map Index. The photo-based drainage maps indicate pipe sizes, but not pipe materials. It is not clear from the drawings what level of detail went into the preparation of the maps. Most of the larger pipes are shown, but small catch basins such as curb inlets are seldom shown. The value in this set of drawings is the indication of several storm drain pipes, mostly culverts, which do not appear on the other existing drawings. A.4 Supplemental Data A.4.1 NPDES Permit The City of Bozeman submitted an NPDES Phase II storm water permit to the Montana Department of Environmental Quality on March 5, 2003. The application included a program to visually inspect the City’s storm sewer outfalls for non-storm water discharges. This inspection has not been completed, and the permit application does not identify outfall locations. This storm water system inventory can be updated after the visual inspection of outfalls is completed. The NPDES permit defines four receiving waters for the City of Bozeman: Spring Creek, Bozeman Creek, Bridger Creek, and the East Gallatin River. The first three receiving waters are tributaries to the East Gallatin River. A.4.2 Aerial Photos Aerial photos can be useful in identifying elements of the storm drain system, open channels in particular, that do not appear on other drawings. Many of the existing open channels are missing from the Grid Maps. Aerial photos could be used to identify the connecting links between isolated, disconnected pipe networks. Miscellaneous aerial photos are available that Bozeman Storm Water Facilities Plan cover different parts of the Bozeman area. There are three sets of aerial photos that cover a large area: • 1980 Aerials: These photos are the base map for the photo-based drainage maps. • 2000 Aerials: The 2000 aerials cover rectangular areas bounded by Patterson Road to the south and Cottonwood Road to the west, to 1,000 feet north of the North 19th Avenue/I-90 interchange and to 1,000 feet east of the East Main Street/I-90 interchange. • 2004 Aerials: The 2004 aerials were flown in April 2004 by Merrick & Company of Aurora, Colorado, and cover about 39 square miles. Production of these photos was funded in part by the Federal Emergency Management Agency (FEMA) for updates to the Bozeman Creek and East Gallatin River floodplain studies. The City coordinated with FEMA to get full photo coverage of the Bozeman 2020 Community Plan study area. The photos have been ortho-rectified, but topographic contour maps have been made only for the FEMA floodplain study areas. For the purposes of this study, the 2004 aerials and the 1980 aerials will be the most useful. The 1980 aerials show many features that have been modified or that no longer exist. This information could help to resolve map discrepancies. The approximate area covered by the 2004 and 1980 aerials is identified on Figure 1.1-1 (Study Area). Both of these photo sets are black & white and are in the City’s files. A.4.3 Topographic Mapping The City of Bozeman does not have an overall topographic map of the study area. An accurate topographic map may be useful in estimating grate/rim and ditch flowline elevations where actual surveyed elevations are not available. The grate/rim elevations could be used in conjunction with the “drop to invert” distances calculated from record drawings to estimate pipe invert elevations. The “drop to invert” distances appear in a column on the junction spreadsheet (Appendix A-1). City-wide topographic mapping is currently available in two forms: USGS quad maps having a contour interval of 40 feet, and the photo-based drainage maps having a contour interval of 5 feet. The accuracy of a topographic map can generally be assumed to be plus or minus about half the contour interval. The photo-based drainage maps would therefore be accurate to ± 2.5 feet, which is close enough to generalize overall pipe slopes under a street, but may not be adequate for hydraulic modeling purposes. In the absence of more current topography, the photo-based drainage maps would be useful in estimating drainage basin and sub-basin boundaries. The contours could be digitized and added to the new Storm Drain Map, then used in combination with the highlighted Grid Maps to delineate basin divides. The 2004 aerial photos are ortho-rectified and were flown to allow area-wide topographic mapping to a 2-foot contour interval for an accuracy of about ± 1 foot in elevation. Topographic mapping has been completed to cover the floodplain study areas for FEMA, but the remaining areas have not been mapped. The map producers have estimated that it would take a minimum of about 6 weeks to produce a topographic map for the entire 39 square mile study area, at a cost of about $1,200 per square mile, or about $46,800 total. A-10 Appendix A: Existing System Inventory Data A.4.4 2004 City Inventory for Pilot Hydraulic Basin As part of an ongoing survey and inventory of the storm drain system, in 2004, City staff focused their efforts on completing the area draining to the 39-inch RCP outfall north of the Rouse Avenue/Beall Street intersection. This pipe outfall is identified as Junction 2488 on the Storm Drain Map. The area discharging at Junction 2488 was selected as a “pilot basin” to receive an increased level of detail with regard to this report’s hydrologic and hydraulic analyses (see Chapter 2 System Analysis). The level of detail used in the pilot basin can be expanded as field investigations are completed in other areas. The data compiled by City staff was fully incorporated into the junction spreadsheet (Appendix A-1) and the link spreadsheet (Appendix A-2). A.5 Compilation of Existing Data A.5.1 General The existing data described in Sections A.2 through A.4 was compiled into two Excel spreadsheets for input into the City’s GIS software, Arcview. The “junction spreadsheet” includes data on the 2,727 junctions, and the “link spreadsheet” includes data on 1,922 conveyance structures. The spreadsheets are two tabs in the same Excel file so they may be linked using formulas. The files are set up for easy conversion into an Access (*.dbf) file that can then be converted into an Arcview file. This process can be reversed to bring Arcview data revisions back into the Excel spreadsheet, although the Excel formulas will be lost. The formulas can be copied back into the Excel file if necessary. The Access file is required because Arcview will not accept the Excel file directly. The Excel spreadsheets contain formulas. These formulas must be converted to numeric or alpha-numeric values in Excel before converting the Excel file to an access file. The Excel spreadsheets are supplemented by a new Storm Drain Map that was converted from Arcview to AutoCAD 2004 format, and by a set of Grid Maps highlighted to show where additional data points and conveyance structures may exist. A.5.2 Junction Spreadsheet The junction spreadsheet, included as Appendix A-1, contains entries for 2,727 data points (junctions). “Unique ID numbers,” described in Section A.2.3, have been assigned to 2,544 of the junctions. The junctions with unique ID numbers include 157 data points that were created in Arcview. These points were located visually on the computer screen, using approximate positions relative to street intersections and other (GPS-located) junctions. Northing/easting coordinates are not given for these points. The remaining 183 junctions, identified on the spreadsheet as those lacking junction numbers, are listed with their general locations noted in the “Comments” column of the spreadsheet. When they are field-located, they can be added to the GIS database. The bottom header row on the junction spreadsheet is a name with a maximum of 8 characters that can be copied into Arcview as the header row for the “junction” database. A-11 Bozeman Storm Water Facilities Plan Above the 8-character name is a more descriptive name that is allowed in Excel but not in Arcview. The columns on the junction spreadsheet are described below in detail. The term “existing drawings” refers to the existing drawings described in Section A.3. • Old GIS/MMI Number: These numbers were assigned only to the junctions identified in the initial stages of data collection, before the “unique ID numbers” were created. The four-digit numbers are from the City’s original (April 2004) GIS database, and the alpha-numeric numbers were created by MMI. This column is retained for future use in cross-checking or resolving discrepancies in the data. • Junction Number: These numbers are the “unique ID numbers”. • 1/4 Section Grid Map Number: These numbers are the sheet numbers from the Grid Maps. The Grid Maps are the common identifier (cross-reference) used to find the general locations of the various data sources. • Subdivision or SID Name: These are the names of the subdivision or SID from which the data was obtained. Subdivision names are coded and are listed alphabetically at the top of the spreadsheet. Missing data indicates junctions that did not appear on the existing drawings. • Estimated Year Built/Source: The estimated year built is listed, along with a coded abbreviation indicating how the estimate was made. The sources of the estimated year built are listed alphabetically at the top of the spreadsheet. The dates on record drawings are assumed to be the most accurate estimate of year built, followed by design drawing dates. Missing data indicates junctions that did not appear on the existing drawings, or that appeared on existing drawings with no date indicated. The estimated year built was used in the Asset Management/GASB 34 Compliance section of this report. • Junction Type: Junction types are coded and are listed alphabetically at the top of the spreadsheet. The codes for points in the City-provided GIS database (point numbers 1001 through 3388) were initially entered as either “CB” or “MH” based on the GIS shape file that they appeared on. Subsequently, some of these junction codes were revised based on review of the existing drawings. Missing data indicates junctions that did not appear on the existing drawings, or where the junction type could not be determined. The junction types indicated should be field-verified at some point; more detailed information on junction type may be necessary for hydraulic modeling or for other purposes. For example, the difference between a “catch basin” and a “manhole” is minor and subject to interpretation. Both are vertical structures of varying inside A-12 Appendix A: Existing System Inventory Data dimensions, shapes and hydraulic properties. For the purposes of this Facilities Plan, the initial determination assumed “catch basins” to be defined as constructed junctions with an open grate that can intercept runoff, and “manholes” to be defined as constructed junctions with solid covers. • Location: These columns list northing and easting coordinates. At this time, entries exist only for junctions in the City-provided GIS database (junction numbers 1001 through 3388). City staff converted the coordinates to the State Plane coordinate system. Northing and easting coordinates for MMI-created Arcview points were not generated; this will be done by City staff. • Grate/Rim Elevation: These columns list grate/rim elevations indicating approximate ground elevations at the top of the junction. The elevations were determined “from Plans” (from the existing drawings), “from GPS” (from the City’s GPS survey) or “from Survey” (from accurate ground survey on City of Bozeman datum). Where curb inlets on the existing drawings indicated top of curb elevations, grate/rim elevations were estimated by subtracting 0.5 feet from the top of curb elevations. The “Source Used for G/R Elev.” column uses a formula to prioritize the three grate/rim elevation sources, and indicates which source will be used in subsequent spreadsheet calculations. The “from Survey” elevations were assumed to be the most accurate, and the “from GPS” elevations were assumed to be the least accurate for the reasons given in Section A.2.2. The spreadsheet will automatically use the most accurate available grate or rim elevations to calculate invert out elevations. • Invert Out Elevation: These columns are dependent on the data entered in previous “Grate/Rim Elevation” columns. If an invert out elevation was indicated on the existing drawings for a particular junction, this elevation was entered in the “From Plans/Invert Out” column. If an elevation had also been entered in the “Grate/Rim Elevation, from Plans” column for that junction, an equation in the “From Plans/Drop” column would calculate and enter a drop distance in feet; otherwise, the “From Plans/Drop” column would remain blank. The “From Survey/Drop” column is for direct entry of measured drop distances from the top of the grate or rim to the invert of the outlet pipe. Alternately, the “From Survey/Drop” information may be entered in the link spreadsheet. The “Source Used for Drop” column uses a formula to prioritize the two drop distance sources, and indicates which source will be used in subsequent spreadsheet calculations. The “From Survey/Drop” column is assumed to be the most accurate source and therefore always takes precedence over the “From Plans/Drop” column. Lastly, the “Calculated Invert Out” column uses an equation to calculate the invert out elevation based on the best available data. The “Calculated Invert Out” values may be used to build a hydraulic model based on the assumption that “invert in” = “invert out.” Alternately, if the drops to all pipes at a junction are measured, the “From Survey/Drop” information can be entered A-13 Bozeman Storm Water Facilities Plan in the link spreadsheet, resulting in a more accurate model that accounts for sudden elevation drops at the junctions. • Comments: The “Comments” column is for miscellaneous notes. There are few entries at this time. Most of the entries are for junctions that are not in the GIS database but have been identified on the existing drawings; these entries typically identify nearby junctions that are in the GIS database. The junction spreadsheet is set up to allow much flexibility in the phasing of additional data input. The formulas make decisions based on the data sources entered, and automatically use the best available data while keeping track of the data sources used and the resulting level of accuracy for each junction. As data entry progresses, the improvements to accuracy and completeness will be evident for each junction. Using Excel software, the data in the junction spreadsheet can be sorted or searched by any column to aid in prioritizing future data collection efforts. For example, if hydraulic modeling is required for a sub-basin located on Grid Map F-6, sorting by this column can be used to quickly view the junctions located within grid map F-6. The sorted junction list can be used along with a similarly sorted link spreadsheet and the highlighted storm drain grid map for F-6, to assess the current level of accuracy and/or completeness within the sub-basin. A.5.3 Link Spreadsheet The link spreadsheet, included as Appendix A-2, contains entries for 1,922 links (conveyance structures). 1,723 of the links have been entered into Arcview as connections between junctions having junction numbers (“unique ID numbers,” as described in Section A.2.3). The remaining 199 links, defined only by an “Old GIS/MMI Number” in the first column of the links spreadsheet, cannot be entered in Arcview because one or both of their endpoint junctions do not exist in Arcview. Data entered for these links was tabulated during the initial stages of data entry, and is being retained for future inclusion in the GIS database once both of the end point junctions are defined in Arcview. The locations of these links are indicated by an upstream or downstream junction number, if one of these exists in Arcview. The general locations of the remaining “non-Arcview” junctions are noted in the “Comments” column of the spreadsheet. The link spreadsheet includes a “Link Number” column for entering a unique alpha-numeric link number defined as the upstream junction number followed by an underscore and the downstream junction number. Because it is rare for a single junction to have multiple outlet conveyance structures, most links could be identified simply by using the upstream junction number as the link number. However, in the case of ponds, diversions and irrigation ditches, two or more separate outlets are possible. Therefore, the upstream and downstream junctions are both used to define the link numbers. The bottom header row on the link spreadsheet is a name with a maximum of 8 characters that can be copied into Arcview as the header in the “link” database. Above the 8-character name is a more descriptive name that is allowed in Excel but not in Arcview. The columns on the link spreadsheet are described below in detail. The term “existing drawings” refers to the existing drawings described in Section A.3. A-14 Appendix A: Existing System Inventory Data • Old GIS/MMI Number: These alpha-numeric numbers were assigned only to the links identified in the initial stages of data collection, before the “unique ID numbers” were created. The numbers were created by MMI. This column is retained for future use in cross-checking or resolving discrepancies in the data, and to allow inclusion of these links in the GIS database once the end point junctions are defined in Arcview. • Link Number: The link number is a unique alpha-numeric number defined as the link’s upstream junction number followed by an underscore and the downstream junction number. • ¼ Section Grid Map Number: These numbers are the sheet numbers of the Grid Maps. The Grid Maps are the common identifier (cross-reference) used to find the general location for the various data sources. • Upstream Junction and Downstream Junction: The upstream and downstream junction numbers are the same numbers used to define the link under the “link number” column. They are duplicated here in separate columns to allow searches (in Excel) to find the links upstream or downstream of a particular junction. Survey data entered in the “From Survey, Grate/Rim” and “From Survey/Drop” columns will be used to calculate invert elevations in the “Calculated Invert Out” columns, which can be used to build a hydraulic model. Although the invert elevations in the junction spreadsheet’s “Calculated Invert Out” column may also be used to build a hydraulic model, the link data is preferred because it more accurately accounts for sudden elevation drops at the junctions. • Subdivision or SID Name: These are the names of the subdivision or SID from which the data was obtained. Subdivision names are coded and are listed alphabetically at the top of the spreadsheet. Missing data indicates links that did not appear on the existing drawings. Some pipes on the Grid Maps were labeled “SID#__” without showing plan limits of the SID work. Only the links directly adjacent to the reference were labeled as being part of that SID. • Estimated Year Built/Source: The estimated year built is listed, along with a coded abbreviation indicating how the estimate was made. The sources of the estimated year built are listed alphabetically at the top of the spreadsheet. The dates on record drawings are assumed to be the most accurate estimate of year built, followed by design drawing dates. Missing data indicates junctions that did not appear on the existing drawings, or that appeared on existing drawings with no date indicated. The estimated year built was used in the Asset Management/GASB 34 Compliance section of this report. A-15 Bozeman Storm Water Facilities Plan • Link Description: These columns describe the link type, shape and material using coded abbreviations that are listed alphabetically at the top of the spreadsheet. Trapezoidal (flat-bottom) and V-ditch shapes are partially defined in the “Link Size” category described below, because the bottom width of a trapezoidal channel is considered a “size” attribute. • Link Size: These columns indicate the link size or dimensions in inches. The “Depth or Dia.” column indicates the height (inside dimension in the vertical direction) of a closed conduit, or ditch depth to the estimated minimum freeboard elevation in the case of an open ditch. The “Width” column is the maximum horizontal width (inside dimension) for closed conduits, or the bottom width in the case of an open trapezoidal ditch. Width is entered as zero for a V-ditch. • Length: These columns indicate the plan view length of the link, in feet. The “From Plans” column indicates the length shown on the existing drawings. The “Calc. From GPS Points” column was included for future entry of plan view lengths as calculated by Arcview. These values could also be calculated using equations in Excel that are linked to the northing and easting coordinates on the junctions spreadsheet; however, this method would require a separate equation for each link. The “Calc. From GPS Points” column was left blank at this time, except where this data was provided by the City as part of their 2004 Inventory for the pilot hydraulic basin (See Section 2.3.5). • Slope: This column indicates the longitudinal slope (slope in the flow direction) for each link. The “From Plans” column indicates the slope shown on the existing drawings. The “Source Used for Length” column uses a formula to prioritize the three length sources, and indicates which source will be used in subsequent spreadsheet calculations. The “from Survey” lengths were assumed to be the most accurate, and the “from GPS” lengths were assumed to be the least accurate for the reasons given in Section A.2.2. The “Calculated Slope” column uses an equation to calculate the invert out elevation based on the best available data. • Comments: The “Comments” column is for miscellaneous notes. There are few entries at this time. This column could be used to elaborate on descriptions given in other columns; for example, to note that an irregular ditch was approximated as a trapezoidal ditch. The link spreadsheet is set up to allow direct input of link data that is pertinent to hydraulic modeling. As data entry progresses, the improvements to accuracy and completeness will be evident for each link. Similar to the junctions spreadsheet, the data in the link spreadsheet can be sorted or searched by any column to aid in prioritizing future data collection efforts. A-16 Appendix A: Existing System Inventory Data A.6 Revised GIS Database A.6.1 General The revised GIS database is included as the junction spreadsheet (Appendix A-1) and the link spreadsheet (Appendix A-2). The Excel file was also submitted to the City. Data points have been created in Arcview for all junctions having “Junction Number” entries in the junction spreadsheet, and for all links between the Arcview-defined junctions. The data contained in the junction and link spreadsheets has not been assigned to the Arcview files, but can be converted and input to Arcview by City staff as described in Section A.5.1. The revised GIS database incorporates data from the existing drawings, described in Section A.3, including a “first cut” attempt at resolving discrepancies, errors and omissions that were found during the drawing review and data entry. This Facilities Plan does not include any field verification of the storm drain map. Because of the large amount of data and the number of data sources covering a given area, discrepancies, errors and omissions can be expected. For example, discrepancies between two data sources can occur due to errors on a drawing, or because older pipes were removed or modified at some point in time. In the older parts of town, the storm drain system has expanded incrementally over time to solve localized drainage problems. It should be noted that these expansions generally do not appear to have included any pipe size or capacity increases in the main (trunk line) branches of the system. Recommendations on future improvements to the GIS database are provided in Section A.9. A.6.2 Data Gaps The Excel spreadsheets include data on 2,727 junctions and 1,922 links. Of these, 2,544 junctions and 1,723 links were entered into Arcview. The remaining 183 junctions can be included once they are surveyed or otherwise added to the Arcview shape files. Of the 173 links not defined in Arcview, those with both end points defined may be added to the Arcview files along with the additional junctions. The largest gaps in the existing data will be in areas where record drawings (for subdivisions, SIDs, etc.) were not provided for review. Another large omission in the GIS database is where open channels exist. The City’s GPS effort was concentrated on and around paved areas, and a pattern of not picking up open pipe ends (pipe inlets & outlets), culverts, roadside ditches and other open channels was evident. A few open channels appearing on the highlighted Grid Maps are highlighted as conveyance structures to be surveyed and added to the database. Many of the remaining open channels can be added to the Grid Maps or the new storm drain map in their approximate locations using aerial photography. A.7 Revised Mapping A.7.1 Map Description A new Storm Drain Map of the study area is included as nine full-size drawings in Appendix I. A-17 Bozeman Storm Water Facilities Plan The Storm Drain Map shows all storm drain elements (junctions and links) that were entered into Arcview. The grid lines from the Grid Maps are used as break lines between the nine sheets. If the area covered by the Storm Drain Map needs to expand beyond the area covered, match lines and inserts could be created and plotted vacant areas of the drawings, or a new drawing could be added. The Storm Drain Map includes a legend to identify different types of junctions and links by color or symbol. Junction numbers are shown for the manholes. However, for clarity, junction numbers for the more numerous catch basins were left off the maps. Link numbers are not shown. Table 4 lists the shape files that were created in Arcview, and the corresponding junction or link type from the applicable Excel spreadsheet. Table 4 Shape Files Junctions Links Type Shape File Name Type Shape File Name CB cb CUL, SD pipes CO cleanouts D ditches D ditch_nodes DP detention_ponds MH mh PB bend PI pipe_in PO pipe_out PO outfalls V vault Because the Storm Drain Map was created in Arcview, there will be many options for text and symbol changes once the spreadsheet data is entered into Arcview by the City. If the drawings are plotted at a larger scale (for example, 1” = 200’ to match the Grid Maps), all junction numbers could be plotted legibly. Plotting junction numbers for links would be redundant if all junction numbers were plotted, but other link data such as pipe diameter could be plotted instead. A.7.2 Outfalls The City’s NPDES permit application identified four receiving waters: Spring Creek, Bozeman Creek, Bridger Creek, and the East Gallatin River. Based on this storm drain system inventory, 108 outfalls discharging to the four permitted receiving waters and their tributaries have been identified and are grouped in Table 5. The table lists all streams and tributaries identified on the FEMA flood insurance rate maps for Bozeman, Montana. The location and existence of the outfalls listed in Table 5 has not been field-verified. There are likely to be many additional outfalls, in areas where construction from new subdivisions is not reflected on the mapping, or in more established areas where existing vegetation may hide the outfalls. A field investigation along each of the receiving waters and their tributaries A-18 Appendix A: Existing System Inventory Data would be necessary to identify all of the outfalls that discharge into the permitted receiving waters. Table 5. Storm Drain Outfalls Permitted Receiving Water Tributary Outfall Sub-totals Outfall Totals Nash-Spring Creek 2 Bozeman Creek 32 Nash-Spring Creek (see above) Mathew-Bird Creek 16 Figgins Creek 10 Bozeman Creek Total: 58 Bridger Creek 4 East Gallatin River 38 Mill Ditch 6 East Gallatin River Total: 44 Total Number of Outfalls Found in Study Area: 108 A.7.3 Map Use and Accuracy The new Storm Drain Map cannot completely replace the existing Grid Maps until all of the data on the Grid Maps is transferred into Arcview. This transfer could be done by visually locating and setting new junction points to define all junctions and links on the Grid Maps that do not already exist on the new Storm Drain Map. However, the work required to do this would be an interim effort subject to change when actual field-verified junction locations become available. In many areas on the maps, junction locations are offset from where you would expect to see them in relation to the street intersections. The shift is a combination of errors in the GPS coordinates and errors in the base street map with respect to State Plane coordinates. The junction/link points were shifted as a whole to a visual “best fit” over the entire study area. For better accuracy, the points could be shifted separately for each of the six drawings, or for an even smaller area per plot. The accuracy of the base map that was provided by the City is unknown, and could possibly be improved upon. A.7.4 Map Discrepancies and Omissions As was true for the source data, the new Storm Drain Map includes assumed junction and link locations representing sometimes contradictory data, defined herein as “discrepancies.” Discrepancies could occur for various reasons, including: A-19 Bozeman Storm Water Facilities Plan • GPS data points show a cluster of junctions in an area that does not match the number of junctions shown on the Grid Maps. • GPS data points in an area show the same number of junctions as the Grid Maps, but the junction locations relative to each other do not correlate. • Pipe connections between junctions may have been assumed rather than field-verified. • Junctions may have been paved over. Cross-checks between different data sources at the same location have identified numerous discrepancies. Many of these discrepancies are minor, such as the exact locations and number of curb inlets at a street intersection. The discrepancies were not resolved as part of this effort, due to the lack of accurate, field-verified documentation of actual (surveyed) locations, pipe materials, and other information. For the purpose of setting up a GIS database, the inconsistencies will not be a problem and can be addressed in the future as necessary, and as funding for field investigation becomes available. Without accurate, well-documented field information, attempts at resolving discrepancies are mostly conjecture. The “data gaps” in the source data (described in Section A.6.2) are apparent in the mapping. The bulk of the omissions on the new Storm Drain Map can be filled in by completing the mapping process that was begun with this Facilities Plan. Additional omissions may exist, but will be difficult to identify without a comprehensive field investigation. A.8 Options for Map and Database Improvements A.8.1 General Improvement of the Storm Drain Map and GIS database will involve filling in missing data, including the “data gaps,” described in Section A.6.2, and improving on the accuracy of the current data. Based on the experience gained in comparing the different data sources of this study, it seems likely that there are errors on the Grid Maps and other data sources. Considerable improvement can be made to the new Storm Drain Map by creating GIS points for each junction shown on the highlighted Grid Maps that is not already in Arcview. The mapping can be further improved by adding culverts and open ditches to Arcview using aerial photography. Continued efforts to improve the mapping using existing data sources will provide some benefit, and will help to streamline future field investigations. A complete review of all existing data sources, including those not used in this mapping effort, would be an efficient way to produce a reasonably complete and accurate storm drain map that can be used for planning purposes. However, significant drawing errors may remain. An effective way to reveal erroneous data and to resolve discrepancies is to perform a thorough field investigation. Options for map and database improvements are categorized in this section as those using existing documentation only, and those using field investigation and surveying. A-20 Appendix A: Existing System Inventory Data A.8.2 Improvements Using Existing Information As described in Chapter 1, one approach to upgrading the new Storm Drain Map and GIS database is to fill in data gaps using existing information that was not used for this Facilities Plan. Mapping improvements based on existing information should generally provide a fairly accurate map, but with the potential for significant errors as described below. Additional information can be incorporated into the Storm Drain Map and database by taking the following steps. The term “visually set GIS data points” means to locate new junctions visually on the computer screen in their approximate positions relative to street intersections and junctions previously located using GPS, and create new data points for these junctions in Arcview. 1. Visually set GIS data points for all junctions identified on the Excel spreadsheets as having no GPS data, and define as many new links as possible using the newly defined junctions. This will allow inclusion of GIS data collected by this study for junctions and links that were not defined by the City’s GPS survey. 2. Visually set GIS data points for all junctions shown on the highlighted Grid Maps, including junctions printed but not highlighted. Define as many new links as possible, including open channels, using the newly defined junctions. This will bring the new Storm Drain Map and GIS database to a point where they can fully replace the Grid Maps. This step includes entry of all data shown on the Grid Maps. 3. Obtain and review complete copies of the partial copies of subdivision and SID drawings used in this study, and enter additional data that was missed on the partial copies. This step will complete the review of the construction drawings used in this study. 4. Develop and implement database maintenance procedures to ensure that construction of new storm drain facilities, and modification, abandonment or removal of existing facilities, is verified and documented on the new Storm Drain Map and GIS database. This will ensure that the new database does not become obsolete over time. 5. Obtain and review complete copies of all available subdivision and SID drawings, and all other construction drawings and record drawings in the study area, that were not used in this study. Visually set GIS data points for all junctions shown on the drawings, and define as many new links as possible using the newly defined junctions. Enter all available data for the new junctions and links. This will complete the review of existing construction drawings for locations of constructed storm drain facilities. 6. Overlay the 2004 ortho-rectified aerial photography on the Storm Drain Map, and use other aerial photos as required to extend the overlay to cover the entire study area. Visually set GIS data points as necessary to: a) revise the alignment of open channels already shown on the map; and b) add all other open channels visible on the photos. This will connect isolated culverts and storm drain networks together, and may identify additional culverts or other storm drain facilities that were missed. 7. Review all existing record drawings to determine which drawings are based on the City of Bozeman vertical datum, and note this with a new code (e.g., “RD+” rather than “RD”) under the “Estimated Year Built/Source” column on the junction A-21 Bozeman Storm Water Facilities Plan spreadsheet and the link spreadsheet. This will identify junctions and links that have fairly accurate elevations and could therefore be considered a lower priority for future field verification of grate/rim or invert elevations. 8. Use the FEMA aerial photos to produce area-wide topographic mapping to a 2-foot contour interval (elevation accuracy of about ± 1 foot), and overlay the contours on the Storm Drain Map. The new topography can be used to estimate drainage patterns and basin divides for overland flow. The new topography could also be used to estimate open channel slopes and elevations, grate/rim elevations, and pipe inverts where “drop to invert” distances are known. Previous experience with field verification of documentation-based storm drain mapping efforts similar to the one described above indicates that drawing errors are not uncommon. For example, a single pipe linked to the wrong upstream junction would create an erroneous assumption of the upstream sub-basin for that pipe, and would make any hydrologic and hydraulic calculations inaccurate for that pipe and downstream areas. Some possible drawing errors are: • Pipe connections between junctions are sometimes assumed and added to drawings without verification. • Links (pipes and open channels) or junctions may have been replaced, abandoned or modified without updating the existing mapping. • Pipes may have been installed and connected to City storm drain without the City’s knowledge. • Pipe sizes and/or materials are sometimes estimated and added to drawings after looking down a manhole or through a catch basin grate in poor lighting conditions, or making other inaccurate estimates. • Existing junctions may be overlooked because they have been paved over, are inaccessible, or are not visible due to vegetation. Drawing errors can be especially common in older pipe systems. Revealing erroneous data requires a thorough inspection of all junctions, including pipe sizes, materials and condition. Despite the potential for errors, the documentation-based effort described in the above steps will result in a fairly complete storm drain map and database. This map would be very useful in planning and performing future field investigations. A.8.3 Map Improvements using Field Investigation The most thorough and accurate way to upgrade the Storm Drain Map and GIS database would be to complete a detailed field inspection and survey of the entire storm drain system. An investigation of this magnitude could be done in phases using existing, documentation-based mapping as a guide in determining priority areas. The database of this Facilities Plan provides a format to identify data from field-investigated areas and differentiate it from other, less reliable data. A detailed field investigation would include two parts: an inspection of all junctions and visible storm drain facilities, and an accurate survey. Of these two, the inspection will provide the most dramatic improvement to the existing database. A-22 Appendix A: Existing System Inventory Data The inspection should include the type, dimensions, orientation and condition of each structure’s cover, chamber, pipes and other features. The presence and amount of sediment, contaminants or groundwater in the chamber bottom should be noted, and whether it has a formed invert or a sump bottom. Pipe data should include drop distance from rim to invert, pipe size, shape, material, condition and approximate orientation with respect to grid or magnetic north. Pipe orientation should be estimated with care, because it can be critical in verifying that the junctions and links shown on the existing documentation-based mapping are accurate and complete. When looking inside of two nearby junctions, pipes that “almost” run toward each other may not in fact connect. Pipes oriented such that they run away from all known junctions will help to locate missing junctions or unauthorized connections to the City’s storm drain system. If the upstream end of a pipe cannot be located by direct observation, there are two effective ways to find or verify the upstream end’s location: dye-testing from potential upstream sources, or smoke-testing from the known outlet if no potential sources are observed. If these methods are inconclusive, the pipe may be an abandoned pipe. A standard procedure should be developed to document field inspections. The use of a standard data sheet to document the field inspections will provide continuity as numerous small field investigations are completed over time by different people. Figure 1.3-1 Storm Drain Systems – Field Notes is an example of a standard data sheet that has been used successfully in previous studies. A useful trick is to clip a compass to the data sheet to orient it to grid north before sketching in pipe directions. Accurate pipe orientation, size, depth and material are critical to identifying and/or resolving discrepancies. A second part to the field investigation would be to complete an accurate survey to locate all junctions, open channels and other visible storm drain facilities with respect to the State Plane coordinate system and the City of Bozeman vertical datum. Horizontal coordinates should be accurate to within ± 1 foot. Elevations should be at the center of the grate or manhole cover and accurate to within ± 0.1 feet or better. A single survey point in the center of a junction grate or cover would be sufficient. Open channels should be in the form of representative cross-sections as needed to represent changes in channel geometry and freeboard (overflow) depth. While surveying open channels, observed pipe outfalls, including all culverts, should be located and documented similarly to pipe ends in the junction inspections. Depending on the accuracy of the existing, documentation-based mapping, the survey phase may be performed before or after the inspection phase. Accurately mapped areas will identify almost all structures to be surveyed; any additional structures found during the inspection could be surveyed later. In poorly mapped areas, the inspection should be completed first to add un-mapped junctions to the map as a guide for the survey crew. It may be feasible to conduct the inspection and surveying phases concurrently. A-23 Bozeman Storm Water Facilities Plan A.9 Recommendations The mapping and database provided in this Appendix A is a compilation of the information made available for this Facilities Plan. Other information exists, including current aerial photography and additional subdivision and SID record drawings. Improvements can be made to the GIS database and Storm Drain Map using the existing drawings and other documentation, by performing field investigations, or both. The following recommendations describe a phased approach to systematically developing and maintaining an accurate storm drain facilities map and GIS database (refer to itemized list in Section A.8.2 for additional discussion). This approach seeks to complete the most beneficial tasks first. • Step 1: Develop Database Maintenance Procedures Develop and implement procedures to ensure that any new construction associated with the storm drain system is verified and added to the database, and develop a standardized junction data sheet similar to Figure 1.3-1 Storm Drain Systems – Field Notes for junction inspections. The new database maintenance procedures should require that database updates also include other new information, such as new data from drainage master plans or studies, outfall location surveys, and modification, abandonment or removal of existing storm drain facilities. If available, the locations of storm drain facilities, with respect to the State Plane coordinate system and the City of Bozeman vertical datum, should be provided to the City. Additional effort will be required to continually transfer new information into the database, but without maintenance procedures in place, the storm drain database would become obsolete as the City continues to grow. • Step 2: Fully Incorporate the Grid Maps Use existing information, particularly the highlighted Grid Maps of this Facilities Plan, to bring the database to a level of completeness exceeding the existing Grid Maps, thus making the Grid Maps obsolete. • Step 3: Add Open Channels Use aerial photography to revise the alignment of open channels already in the database, and add to the database other open channels that are visible on the aerial photos. • Step 4: Update Poorly Mapped Areas of the Database: Make document-based improvements to the map and database in areas where the mapping is substantially incomplete. These areas can be identified by comparing the new Storm Drain Map to the 2004 aerial photos to locate recently developed areas. • Step 5: Incorporate Remaining Documentation-Based Data: Complete the input of data from the City’s files for areas or subdivisions not completed in Step 4, and obtain topographic mapping based on the 2004 aerial photos. A-24 Appendix A: Existing System Inventory Data A-25 The step-by-step recommendations listed above are documentation-based improvements not requiring field investigation. At any time, the need for localized field investigations may arise due to other factors. For example, if a detailed study of a drainage outfall or sub-basin is performed, or a flooding problem needs to be resolved, field investigation and survey for those areas could be completed as part of the project and incorporated into the storm drain database. Another possibility is that NPDES permitting may create a need for a field investigation of outfalls. The database is set up to easily incorporate data from miscellaneous, small field investigations. A standardized junction data sheet similar to Figure 1.3-1 (Storm Drain Systems – Field Notes) should be made available for all field investigations. Over time, a City-wide field investigation could eventually become a matter of filling in the gaps. Bozeman Storm Water Facilities Plan Appendix A-1: Junction Spreadsheet CITY OF BOZEMAN STORM DRAIN SYSTEM DOCUMENTED STORM DRAIN DATA - JUNCTIONS File: P:\Water\11206 Bozeman\10944 Stormwater Facilties Plan\Task 200 Existing System Inventory\Data\EXCEL SPREAD SHEET\[Storm Drain Data.xls]Links 1/4 Section Subdivision/SID:Map No.SymbolName (number/filing as noted in table I-3 AS Annie Subdivision/SID 649 Est. Year Built - SourceJ-5 BMS Babcock Meadows SubdivisionL-1*BME Baxter Meadows Estate Homes D Design Drawing (some partial copies, may be RD but copies are not marked)H-3 BSD Blackmore Storm Drain EST Rough Estimate (see comments)J-5 BIH Bozeman Interfaith Housing RD Record DrawingI-3 BS Brentwood SubdivisionE-0/1, F-0 BCS Bridger Creek SubdivisionK-4 BPE Bridger Peaks Estates SubdivisionK-4 CS Cascade Subdivision Junction TypeI-3 CA Castlebar ApartmentsJ-0 CCS Cattail Creek Subdivision CB Catch Basin (any grated inlet)F-8 C&SC Circle Drive and Spring Creek Drive/SID 531 CC Curb Cut (to surface drainage trough or ditch)G-2/3 EAI Eleventh Ave. Improvements CO Cleanout (solid cover)D-5 ESC Ellis Street Crossing D DitchI-0*GCS Gallatin Center Street & Storm Plans DP Detention PondD-1*H The Headlands MH Manhole (solid cover)J-3 HCS Harvest Creek Subdivision PB Pipe BendD-5 HB Highland Boulevard/SID 647 PI Pipe InletD-7 HBR Highland Boulevard Reconstruction PL Plug (at pipe end)C-5*KM Kamp Minor Sibdivision PO Pipe OutfallI-1*LCC Lewis & Clark Commercial Subdivision V VaultK-5 MU Master Utility (Fallon St. & Private Dr.)K-5 NP Nelson PropertyL-5*SCV The Spring Creek Village ResortSID (#)Special Improvement District (SID # as noted in table)Grate/Rim Elev. - SourceK-5 VCBP Valley Commons Business ParkK-5 VCS Valley Creek Subdivision D Design Drawing (some partial copies, may be RD but copies are not marked)L-4 VWS Valley West Subdivision GPS Global Positioning System (GPS) SurveyG-2 WAL Bozeman, Montana Wal-Mart RD Record DrawingG-9/10*WFS Westfield SouthF-9 WMS West Meadow SubdivisionJ-4 WS Willow SubdivisionI-6 YC Yellowstone Center * indicates 1/4 section grid maps that do not exist Column Input Source Notes GPS Data compiled by City Staff 1. Location (Northings and Eastings) are on the State Plane coordinate system2. Grate/Rim elevations may be on different vertical datums, and may have varying degrees of accuracy. ThesSurvey Data elevations should be verified and converted to City of Bozeman datum before using in hydraulic calculation3. Grate/Rim elevations from GPS were obtained from the City of Bozeman in meters, then converted to feeLogged from City's Drawings by MMI 4. "Calculated Invert Out" Elevations were calculated using identified sources for "G/R Elev." and "Drop. Where no source is indicated for "Drop," "Calculated Invert" equals invert from PlansExcel Formula - DO NOT ENTER DATA Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 1001G-9CB512490.35241573557.77194957.43GPS 1002G-10CB509379.14321573138.69474996.53GPS 1003G-10CB509348.51301573110.21334996.84GPS 1004G-10CB509518.96151573377.45114993.65GPS 1005G-10CB509521.43841573419.44274993.04GPS 1006G-10CB509583.13611573624.80794985.23GPS 1007G-9WDS, Ph 32001RDCB511841.06191573532.61114967.34GPS possible duplicate of 2670 1008G-9WDS, Ph 32001RDCB511792.41641573587.98014967.68GPS possible duplicate of 2672 1009G-9CB512149.13781573553.59094963.72GPS 1010G-9CB512185.88091573605.57134963.56GPS 1011G-9CB512880.57431573830.14384953.02GPS 1012G-9CB512846.33961573818.51454953.30GPS 1013G-9CB513202.29011573909.94234947.81GPS 1014G-9CB513238.32031573913.50434947.73GPS 1015G-9CB513639.13461573975.64134943.50GPS 1016G-9CB513597.04261573945.91494942.99GPS 1017G-9CB513916.81141574041.67414939.97GPS 1018G-9CB513944.69141574042.41354941.77GPS 1019 E-3,E-4 CB527230.40611578839.62704737.87GPS 1020 E-3,E-4 CB527203.54401578871.41584739.05GPS 1021 E-4 CB527300.55511578004.46454746.22GPS 1022 E-4 CB527250.48651578048.52484751.60GPS 1023 E-4 CB527251.04831578019.20624746.35GPS 1024 E-4 CB527267.82751577999.83794751.23GPS 1025 E-4 CB527262.98721577567.39114749.43GPS 1026 E-4 CB527262.17601577609.72894751.39GPS 1027E-4CB527279.37171577311.73834750.02GPS 1028E-3CB527613.34201577608.04874745.81GPS 1029E-3CB527656.61991577575.85664748.08GPS 1030E-3CB527664.22791578035.12204741.14GPS 1031E-3CB527630.14301578015.70224740.91GPS 1032E-3CB527629.80521578033.33444741.14GPS 1033E-3CB527611.73531578034.42384742.24GPS 1034E-3CB527609.50781578065.04384741.86GPS 1035E-3CB527627.52851578066.51734742.42GPS 1036E-3CB527661.95921578067.89474742.48GPS 1037E-3CB528019.39321578081.61454737.96GPS 1038E-3CB527986.60471578080.16584737.47GPS 1039E-3CB527966.96931578077.32834733.85GPS 1040E-3CB527969.19101578047.01594735.52GPS 1041E-3CB527985.62451578045.69004734.00GPS 1042E-3CB528020.05121578047.27264734.55GPS 1043E-3CB528346.34271578059.26754732.74GPS 1044E-3CB528328.28671578059.63944732.79GPS 1045E-3CB528327.68761578090.90594733.83GPS 1046E-3CB528345.70431578092.58424733.51GPS 1047E-3CB528378.49471578093.93044733.03GPS 1048E-3CB528379.12721578060.92124733.86GPS 1049E-3CB528344.50641578412.00654727.40GPS 1050E-3CB528378.09031578371.93754727.27GPS18671051F-5/6SID 551912DCB524601.94211575322.52624781.90GPS18681052F-5/6SID 551912DCB524599.48071575365.34544780.68GPS18701053F-5/6SID 551912DCB524292.47191575288.90674794.13GPS18691054F-5/6SID 551912DCB524293.69951575310.46604790.32GPS18771055F-5/6SID 551912DCB523933.38841575275.56444796.91GPS18781056F-5/6SID 551912DCB523934.60621575297.63634794.56GPS18711057F-5/6SID 551912DCB523932.14481575340.45554803.80GPS18721058F-5/6SID 551912DCB523896.02271575341.71184793.54GPS18731059F-5/6SID 551912DCB523879.65401575339.65474793.19GPS18741060F-5/6SID 551912DCB523882.10751575297.24564791.14GPS18751061F-5/6SID 551912DCB523898.52931575296.53474790.50GPS18761062F-5/6SID 551912DCB523898.95171575274.49434789.07GPS18851063F-5/6SID 551912DCB523574.23801575265.70774796.19GPS18861064F-5/6SID 551912DCB523575.51871575284.49924797.44GPS18791065F-5/6SID 551912DCB523572.98061575331.31644797.05GPS18801066F-5/6SID 551912DCB523536.88801575331.03494793.61GPS18811067F-5/6SID 551912DCB523520.53501575328.15774801.29GPS18821068F-5/6SID 551912DCB523521.36991575284.58954794.98GPS18831069F-5/6SID 551912DCB523536.15941575283.43724796.18GPS18841070F-5/6SID 551912DCB523538.23771575260.60814803.26GPS18931071F-5/6SID 551912DCB523213.51001575252.53914800.74GPS18941072F-5/6SID 551912DCB523214.76911575272.45824801.58GPS18871073F-5/6SID 551912DCB523212.23111575319.27554801.93GPS18881074F-5/6SID 551912DCB523176.15621575318.07144801.67GPS18891075F-5/6SID 551912DCB523159.79521575315.60424801.53GPS18901076F-5/6SID 551912DCB523162.23311575274.01524802.29GPS18911077F-5/6SID 551912DCB523178.65101575273.50934801.41GPS18921078F-5/6SID 551912DCB523179.08711575250.75134799.24GPS18951079F-5/6SID 551912DCB522852.68751575329.92144809.05GPS18961080F-5/6SID 551912DCB522816.62231575328.20474812.00GPS18971081F-5/6SID 551912DCB522819.53361575261.90984813.59GPS8S551082F-5/6SID 551912DCB522494.03761575293.92374823.98GPS18991083F-5/6SID 551912DCB522463.74771575247.70794826.54GPS19001084F-5/6SID 551912DCB522038.23351575275.95914834.43GPS19011085F-5/6SID 551912DCB522020.99071575233.89024831.54GPS19081086F-5/6SID 551912DCB521696.26451575225.71864837.12GPS19021087F-5/6SID 551912DCB521696.61791575292.89654835.43GPS19041088F-5/6SID 551912DCB521667.54971575268.54764842.19GPS19031089F-5/6SID 551912DCB521665.46351575291.78684837.74GPS19051090F-5/6SID 551912DCB521647.89851575266.53024835.89GPS19071091F-5/6SID 551912DCB521666.75821575224.23024836.16GPS19061092F-5/6SID 551912DCB521645.39601575225.87184837.70GPS19091093F-6SID 3201938DCB521343.81551575208.60664840.72GPS19101094F-6SID 3201938DCB521304.70731575280.05334842.53GPS19111095F-6SID 3201938DCB521304.39121575210.92764838.09GPS19121096F/G-6SID 2271921DCB520943.54261575204.01234846.73GPS19131097F-6SID 3201938DCB520563.75741575243.39504849.64GPS19141098F-6SID 3201938DCB520564.56291575201.36424848.28GPS1099F-6CB520261.35561575183.34994849.42GPS1100F-6CB520207.84881575235.54884848.03GPS1101F-6CB520207.07891575190.10374849.77GPS1102F-6CB519900.58901575172.12904858.82GPS1103F-6CB519856.87841575226.87434855.15GPS1104F-6CB519852.81031575182.28904855.54GPS19211105F-6SID 428DCB519548.54381575219.52964857.36GPS19221106F-6SID 428DCB519467.39311575173.05684860.00GPS19231107F-6SID 428DCB519390.70331575150.66664861.72GPS1108F-7CB518244.25181574697.15784871.65GPS1109I-6CB521293.81831568571.85124836.07GPS1110I-5,I-6CB522131.96581567903.49184825.98GPS1111I-5,I-6CB522129.42341567950.51424825.30GPS1112E-4CB524858.62571579823.59074791.63GPS Page 1 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 1113E-4CB524952.48131579806.41704791.26GPS 1114E-4CB524990.81841579518.26534788.01GPS 1115E-4CB524899.11371579508.81694784.85GPS 1116E-4CB524898.26051579210.78734787.57GPS 1117E-4CB524905.65621579167.34484787.11GPS 1118E-4CB524920.50011578906.43174773.96GPS 1119E-4CB524917.79521578876.33244770.61GPS 1120E-4CB524997.55651578738.39124765.38GPS 1121E-4CB524936.89811578735.69084766.94GPS 1122E-4CB525003.65561578591.34744766.76GPS 1123E-4CB525008.86281578405.21454768.05GPS 1124E-4CB524948.90951578365.71164768.42GPS 1125E-4CB524933.41061577975.72084770.29GPS 1126E-4CB524948.93471577936.22844770.68GPS 1127E-4CB525021.11591577936.99624771.95GPS 1128E-4CB525155.60561577939.98334771.27GPS 1129E-4CB525151.61611577976.92784772.52GPS 1130E-4CB525021.58721577484.24254771.59GPS 1131E-4CB524952.70211577482.71734770.84GPS 1132E-4CB524934.56551577487.29224771.70GPS 1133E-4CB524937.19371577521.38964772.39GPS 1134E-4,F-4CB524873.48471577164.11164777.96GPS 1135E-4,F-4CB524868.00811577193.02864777.67GPS 1136F-4CB524936.72431577032.10974778.16GPS 1137E-4CB525188.59241577246.03744769.08GPS 1138F-4CB524939.27011577070.51254776.83GPS 1139F-4CB524909.72261577071.17694775.04GPS 1140F-4CB525022.97021576898.29234775.35GPS 1141F-4CB524958.99401576897.47664775.22GPS 1142F-4SID 104CB524942.19341576489.82194778.98GPS 1143F-4SID 104CB524942.89271576453.32724793.404775.16Plans4788.744.66Plans4788.74 1144F-4CB524962.15141576133.32684776.14GPS 1145F-4CB525050.33431575042.23294776.73GPS 1146F-4CB525051.32051574990.77124777.91GPS 1147F-4CB524982.75171574972.74134776.01GPS 1148F-4CB524980.20581575019.96854774.09GPS 1149F-4CB524961.37591574975.10054774.04GPS 1150F-4CB524973.49881575369.94934776.03GPS 1151F-4CB524956.58011575310.96584779.30GPS 1152F-4CB524950.73351575701.67584780.94GPS 1153F-4CB524951.64091575739.94474779.19GPS 1154F-4CB525031.94411576087.49074775.59GPS 1155F-4CB524962.99421576089.34864776.07GPS 1156F-4CB524944.93021576090.13054771.44GPS 1157F-4CB525029.43161576132.97534803.95GPS 1158G-0CB535362.21721574131.28714646.90GPS 1159G-0CB535384.08391574103.30004647.17GPS 19761160G-0CB535412.09131574611.04844642.82GPS 19771161G-0CB535446.54331574611.29844643.18GPS 1162G-1CB534731.62971574672.15114655.39GPS 1163G-1CB534697.17181574672.20864655.48GPS 1164G-1CB534330.28661573953.17284687.84GPS 1165G-1CB534419.29741573931.90754683.61GPS 1166G-1CB533247.12491574564.63504677.61GPS 1167G-1CB533246.42741574601.02694677.73GPS 1168G-1CB533546.02341574207.95134697.90GPS 1169G-1CB533406.61631574204.76684697.95GPS 1170G-1CB533502.30641574006.21784703.09GPS 1171G-1CB533679.43021574010.53544700.37GPS 1172G-2CB532575.59421572533.06474687.70GPS 1173G-2CB531829.28731574231.76014693.22GPS 1174G-2CB531791.57441574230.42194692.68GPS 1175G-1,G-2CB532545.75801574432.23524686.97GPS 1176G-1,G-2CB532543.42041574468.59584686.59GPS 1177F-1CB532534.13871576494.09184681.84GPS 1178G-1CB533539.04961573801.30914700.53GPS 1179G-1CB532904.01291573033.24114701.01GPS 1180G-1CB532911.75211573057.48874701.34GPS 1181G-1CB532836.30691573055.83764702.78GPS 1182F-3CB529424.10801577301.45744717.66GPS 1183F-3CB529453.84191577205.42454720.36GPS 1184F-3CB529401.42011577201.03594718.20GPS 1185F-3SID 424CB528353.34331577265.76214729.07GPS 1186F-3SID 424CB528351.40461577195.68294732.04GPS no num1187F-4CB527283.95641577158.10254743.60GPS 20041188E-3SID 1151916DCB527246.52031577142.31024745.53GPS 1189G-2CB530614.74861573393.51524722.95GPS 1190G-2CB530311.24961573476.50704725.15GPS 1191G-2CB530476.58341574181.63344712.69GPS 1192G-2CB530510.82921574192.64734713.46GPS 1193G-2CB530358.87121574330.63934708.80GPS 20101194G-2WAL1993DCB530390.05341574758.35954722.204703.20Plans4720.351.85Plans4720.35 20111195G-2WAL1993DCB530675.78881574746.09424724.004708.74Plans4719.194.81Plans4719.19 20121196G-2WAL1993DCB530820.13461574748.45044724.004707.39Plans4718.615.39Plans4718.61 20131197G-2WAL1993DCB530981.14871574394.76344720.804702.68Plans4717.163.64Plans4717.16 20141198G-2WAL1993DDP531051.73241574393.24474700.15GPS4713.95-13.80Plans4713.95 20151199G-2WAL1993DCB530845.02781574305.70474721.714704.65Plans4720.091.62Plans4720.09 1200G-2CB530204.78521574065.97744713.17GPS 1201G-3CB529538.62151574236.98074728.45GPS 1202G-3CB529359.81741574234.68204724.08GPS 1203G-3SID 535, 536DCB529104.31421574296.13544718.52GPS 1204G-3SID 535, 536DCB529143.25091574319.23774718.99GPS 1205G-3SID 535, 536DCB529149.16231574096.40614718.54GPS 1206G-3SID 535, 536DCB529097.08631574073.97504718.65GPS 1207G-3SID 535, 536DCB529096.32991574113.44244719.93GPS 1208G-3CB528772.22901574072.77394712.32GPS 1209G-3CB528735.46471574107.55194711.94GPS 1210G-3CB528465.83831574049.77594714.83GPS 1211G-3CB528447.51511574064.08954714.41GPS could be catch basins or ends of culvert? 1212G-3CB528433.23621574124.21824715.16GPS could be catch basins or ends of culvert? 1213G-3CB528379.51011574102.26814718.88GPS 1214G-3CB528380.26061574063.10814720.06GPS 1215G-3CB529466.38821573125.99964730.24GPS 1216G-3CB529652.22851573103.61624728.65GPS 1217G-3CB529638.08361573071.14424728.67GPS 1218G-3CB529866.00501573164.62904724.93GPS 20351219G-2/3EAI2002RDCB530030.05541572310.14374726.87GPS 20361220G-2/3EAI2002RDCB530105.44001572314.97274722.59GPS 1221G-2PO529941.90681573484.91334724.39GPS 1222G-2PI529938.56121573573.86304724.33GPS 1223G-2CB530079.95511573473.40714723.50GPS 1224G-3CB529902.05421574108.88704714.79GPS 1225G-3CB530004.38681574248.67604714.97GPS 1226G-3SID 535, 536CB529877.16991574208.70454715.67GPS 1227I-0CB537822.92341567736.89554628.74GPS 1228I-0CB537809.71391567142.16214629.64GPS 1229I-0CB537767.10241567139.60174633.26GPS 1230I-0CB537548.95101567135.72694629.89GPS 1231I-0CB537483.33941567134.67404630.11GPS 1232I-0CB537344.82251567341.83494630.05GPS 1233I-0CB537341.19831567530.86704630.34GPS 1234I-0CB537335.82781567725.40334630.47GPS 1235I-0CB537540.85571567729.12914630.36GPS 1236I-0CB537097.84041567386.83634636.35GPS 1237I-1CB535420.43041568783.09354651.38GPS 1238I-1CB533038.02691567754.06704682.27GPS 1239I-1CB532916.20511567860.63964682.35GPS 1240I-1CB532914.50901567949.10804682.45GPS 1241H-3CB528376.89951569359.14744741.71GPS 1242H-3CB528378.68831569437.01774742.55GPS 1243H-3CB528558.71421569461.18414739.53GPS 1244H-3CB528384.69301569466.15464742.81GPS 1245F-9CB513387.33721574785.28644943.68GPS 1246F-9CB513021.90451574760.54144948.49GPS 1247F-9CB513142.52681576000.96814925.12GPS 1248J-3HCS, Ph 11999DP528307.16551566235.34774731.88GPS 1249J-3HCS, Ph 11999CC528259.42251566243.66194731.46GPS 1250J-3HCS, Ph 11999CC528221.70171566242.73364731.54GPS 1251J-3HCS, Ph 22000San MH529519.03361566185.77304722.80GPS could be sanitary sewer MH (Ph 2 HCS) 1252J-3CB530140.06721565801.32314722.10GPS 1253J-3CB530090.83361565801.81484721.80GPS 1254J-3CB530066.88791565852.63094722.51GPS 1255J-3HCS, Ph 32001DP528825.82301566055.77894729.98GPS 1256J-3HCS, Ph 22000CC528782.01701566029.91654729.87GPS 1257J-3HCS, Ph 22000CC528742.65201566029.16174730.05GPS 1258J-3HCS, Ph 22000DP528698.71721566095.59254728.00GPS 1259G-4CB524970.24571574683.51284779.27GPS 1260F-4CB524989.07981574642.54564782.67GPS 1261F-4CB525054.68441574644.00804783.05GPS 20781262G-4/5SID 981915DCB525070.62881574068.89984786.74GPS 20791263G-4/5SID 981915DCB525003.61971574055.10434788.63GPS 2S981264G-4/5SID 981915DCB524989.67711574012.07334790.16GPS 20811265G-4/5SID 981915DCB525008.09081573993.04414788.74GPS 20821266G-4/5SID 981915DCB525070.08691574011.56344788.46GPS 20831267G-4/5SID 353DCB525090.38061573466.38084789.62GPS 20841268G-4/5SID 353DCB525098.36981573391.97934788.12GPS 20851269G-4/5SID 353DCB525020.20931573360.74154786.67GPS 20861270G-4/5SID 353DCB525021.50771573378.61034786.79GPS 20871271G-4/5SID 353DCB525000.58961573357.08394786.90GPS 20881272G-4/5SID 353DCB525022.58831573322.22804784.13GPS 20891273G-4/5SID 353DCB525001.19871573325.30474784.35GPS 20911274G-4/5SID 981915DCB525090.42141573121.81024780.44GPS 20901275G-4/5SID 981915DCB525108.63081573113.44234780.90GPS 7S981276G-4/5SID 981915DCB525107.59971573081.63184780.68GPS 20941277G-4/5SID 981915DCB525009.79831572962.23374779.58GPS 20931278G-4/5SID 981915DCB525026.55171573029.82834776.96GPS 1279G-4CB525034.65191572778.42604774.46GPS 1280G-4CB525015.39021572670.48064773.87GPS 1281G-4CB525034.25001572628.18094774.93GPS 1282G-4CB525103.15421572714.31144773.20GPS 1283G-4CB525097.05081572775.93004772.58GPS 1284G-4CB525106.72531572356.78434780.09GPS 1285G-4CB525041.13101572269.17924778.65GPS 1286G-4CB525037.49441572030.88344778.30GPS 1287G-4CB525035.00931572074.93274778.13GPS 1288H-4CB525159.28291570299.69524783.51GPS 1289H-4CB525161.97051570245.08714783.31GPS 1290H-4CB525076.19011570268.97794783.86GPS 1291G-4CB525434.91741572355.28094768.40GPS Page 2 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 1292G-4CB525433.67951572419.86444768.26GPS 1293G-4CB525413.00531572728.04404766.12GPS 1294G-4CB525426.78081572779.78874766.65GPS 21111295F/G-4SID 408DCB525433.11211574675.35994775.61GPS 21121296F/G-4SID 408DCB525377.61791574660.04184774.01GPS 1297G-6CB519418.84221573511.19954884.02GPS 1298G-6CB519449.32741573376.00544889.74GPS 1299G-6CB519553.85661573658.07754879.55GPS 1300G-6CB519609.63011573658.83874878.91GPS 1301G-6CB519741.41581573631.72704877.60GPS 1302G-6CB519718.45301573545.65644883.85GPS 21191303G-7SID 447RDCB518589.04981574428.61934875.63GPS 21201304G-7SID 447RDCB518608.02331574466.00424874.56GPS 21211305G-7SID 447RDCB518244.36661574434.31974874.27GPS 21221306F-8C&SC1974RDCB515597.71281574433.94974932.654912.84Plans 21231307F-8C&SC1974RDCB515635.44011574434.57034932.084912.87Plans 1308H-7CB519506.32901569460.64994865.81GPS 1309H-7CB518916.09341569265.35694876.01GPS 1310H-4CB525418.52501569358.52934777.52GPS 1311H-4CB525855.64031569409.77534769.93GPS 1312H-4CB526150.97281569410.51454769.59GPS 1313H-4CB526762.09561569457.50744761.75GPS 1314H-4CB527404.52541569497.61444756.57GPS 1315H-4CB527407.91861569406.20414756.16GPS 1316H-4CB526765.44561569368.35244761.08GPS 1317H-4CB526153.92391569342.16964770.25GPS 1318H-4CB525421.47801569290.08184775.03GPS 1319H-4CB525089.51421569317.14954783.02GPS 1320H-4CB525066.55321569316.60684782.35GPS 1321I-5CB524371.60021569191.70854797.37GPS 1322I-5CB523635.25741569171.64434812.36GPS 1323H-7SID 538DCB519525.02871571053.02044861.57GPS 1324H-7CB519093.02231571163.08414867.07GPS 1325H-7CB518610.02661571365.18494883.34GPS 1326H-7CB518678.91801571366.40294876.02GPS 1327H-7CB518738.77181571325.50404883.30GPS 1328H-7CB518738.71281571328.57944881.80GPS 1329H-7CB519206.83611571474.35654875.50GPS 1330H-7CB519313.11461571493.93014872.60GPS 1331H-7SID 538DCB519469.24501571395.19164862.43GPS 1332H-7CB519467.72211571474.63984866.63GPS 1333H-7SID 538DCB519522.28181571453.12434865.23GPS 1334H-7SID 538DCB519488.91631571053.76394862.57GPS 1335H-7CB519426.19751571843.33764870.35GPS 1336H-7SID 538DCB519463.11761571800.46084868.43GPS 1337H-7CB519536.15351571842.26614867.17GPS 1338G-5CB522075.96321571851.97924820.17GPS 1339G-5CB522073.31891571904.33224820.40GPS 1340G-5CB522523.92521571936.65864809.38GPS 1341G-5CB522530.09951571871.34924813.74GPS 1342G-5CB522889.11081571888.48594810.32GPS 1343G-5CB522887.87481571952.96704811.90GPS 1344G-5CB523234.05901571954.47494806.31GPS 1345G-5CB523246.48961571905.18094804.91GPS 1346G-5CB523605.50451571922.11244801.88GPS 1347G-5CB523591.44351571970.86244799.36GPS 1348G-5CB523964.51731571939.14654801.77GPS 1349G-5CB523963.32261572001.47474795.35GPS 1350G-5CB524023.38241571949.81204794.75GPS 1351G-5CB524113.72591571944.67274799.22GPS 1352G-5CB524311.88541571964.46904795.74GPS 1353G-5CB524309.39041572009.03104794.41GPS 1354G-4CB526379.39921573500.93104765.51GPS 1355F-4CB525421.20701576152.78904766.64GPS 1356F-4CB525381.83401576152.44474766.70GPS 1357F-4CB525364.15311576133.23654766.54GPS 1358F-4CB525364.87211576095.71664765.38GPS 1359F-4CB525379.98961576077.44464769.62GPS 1360F-4CB525419.37441576077.17384765.93GPS 1361F-4MH525399.86201575382.93994767.66GPS 1362F-4MH525367.20511575374.62284768.24GPS 1363F-4MH525346.53261575340.28224778.44GPS 1364F-4SID 318CB525370.04241575055.33334764.71GPS 1365F-4SID 318CB525352.36541575035.92014764.50GPS 1366F-4SID 318CB525352.96461575004.65354764.45GPS 1367F-4SID 318CB525371.37241574985.93174763.97GPS 1368F-4SID 318CB525410.72571574987.30134762.65GPS 1369F-4SID 318CB525411.06731575055.09414760.33GPS 1370E-4CB525360.90531577929.66254770.61GPS 1371E-4CB525405.15571577932.35634771.68GPS 1372E-4CB525359.86031577984.19964768.84GPS 1373E-4CB525739.38401577102.04734762.18GPS 1374E-4CB525752.29551577113.26774762.84GPS 1375E-4CB525783.46541577113.55734761.91GPS 1376E-4CB525745.35951577047.09204765.24GPS 1377E-4CB525783.21791577040.84394762.68GPS 1378E-4CB526670.25051577160.28964750.04GPS 1379F-4SID 418CB527233.28101576805.68994748.18GPS 1380F-4SID 418CB527235.84631576843.06764747.75GPS 1381F-4SID 418CB527249.90721576537.42814750.05GPS 1382F-4SID 418CB527249.55761576470.04554751.80GPS 1383F-4CB527239.65201576130.72024756.68GPS 1384F-4CB527263.54021576082.87664753.39GPS 1385F-4CB527259.42341575783.96474751.49GPS 1386F-4CB527252.27141575729.06564752.30GPS 1387F-4SID 424CB527256.40101575427.95314749.34GPS 1388F-4SID 424CB527260.92311575363.22764750.43GPS 1389G-4CB527296.38861574711.27424751.18GPS 1390G-4CB527263.03441574739.34914750.77GPS 1391G-4CB527260.97591574675.52314747.85GPS 1392G-4CB527303.95821574401.92104749.35GPS 1393G-4CB527269.49801574402.08094747.34GPS 1394G-4CB527267.46321574337.02484752.04GPS 1395G-4CB527305.18411574337.95284750.17GPS 1396G-4CB527313.40871574336.87984751.04GPS 1397G-4CB527324.05641574038.14834757.83GPS 1398G-4CB527273.46531574023.84714756.33GPS 1399G-4CB527278.77401573746.85664757.32GPS 1400H-7CB517491.55851571420.65964905.73GPS 1401H-7CB518110.39121571493.74504894.00GPS 1402G-7SID 537DCB518126.99961571825.71594900.37GPS 1403G-7SID 537DCB518189.56791571814.40394899.74GPS 1404G-7SID 537DCB518130.53591572411.66234903.90GPS 1405G-7SID 537DCB518166.63661572411.53384903.61GPS 1406G-7SID 487DCB518150.75631573753.73534892.48GPS 1407G-7SID 487DCB518073.80091573830.81514891.83GPS 22241408G-7SID 447RDCB518144.79041574321.86064878.58GPS 22251409G-7SID 447RDCB518144.34811574430.55704876.62GPS 1410G-7,F-7CB518083.47081574524.86604875.37GPS 22271411G-7,F-7SID 447RDCB518045.21741574466.08854874.88GPS 1412G-7,F-7CB518073.83131574685.38004871.34GPS 1413F-7CB518136.94401575330.61484865.96GPS 1414F-7CB518069.68681575329.73624867.68GPS 1415F-7CB518165.29701575477.90984865.69GPS 1416F-7CB517985.63881576205.04624862.45GPS 1417F-7CB517934.07291576155.96124864.06GPS 1418F-7CB517454.19301576452.36994871.61GPS 1419F-7CB517339.62261576437.35544870.42GPS 1420E-7CB517019.61071577039.35614873.50GPS 1421E-7CB516952.60881577025.15074873.77GPS 1422E-7CB516819.86621577872.86534881.86GPS 1423E-7CB516890.73201577856.68684881.89GPS 1424E-7CB516798.28051578399.97904909.73GPS 1425E-7CB516910.16571578383.86864908.20GPS 1426E-7CB516766.72401578933.67004937.54GPS 1427E-7CB516703.26581578905.79074937.61GPS 1428E-7CB516656.78451579447.70774971.14GPS 1429E-7CB516682.87911579541.63254974.39GPS 1430E-7CB516555.90561579488.84684977.04GPS 1431H-7CB518168.40831571463.06614890.68GPS 22511432G-4/5SID 353DCB524339.52181573005.17464797.25GPS 22481433G-4/5SID 353DCB524337.54561573022.67304795.98GPS 22491434G-4/5SID 353DCB524306.32851573024.84364796.27GPS 22501435G-4/5SID 353DCB524306.72151573004.34094792.16GPS 22531436G-4/5SID 353DCB524285.45371573001.06184790.36GPS 22521437G-4/5SID 353DCB524289.29211572972.01094789.12GPS 22541438G-4/5SID 353DCB524283.29911572942.25874791.44GPS 22551439G-4/5SID 353DCB524303.33141572924.38864789.36GPS 22591440G-4/5SID 353DCB523945.71531572920.09814788.40GPS 22561441G-4/5SID 353DCB523932.35381572932.35334796.86GPS 22571442G-4/5SID 353DCB523935.04881572962.96514795.54GPS 22601443G-4/5SID 353DCB523982.03741572994.01584792.14GPS 22611444G-4/5SID 353DCB523981.67581573012.87834794.24GPS 22621445G-4/5SID 353DCB523950.52151573011.76844795.21GPS 22631446G-4/5SID 353DCB523949.22711572993.69454793.56GPS 1S3531447G-4/5SID 353DCB523929.56621572992.18974793.17GPS 22641448G-4/5SID 981915DCB523621.25461572983.71664799.29GPS 22651449G-4/5SID 981915DCB523619.25091573002.65024798.76GPS 22661450G-4/5SID 981915DCB523592.99761573002.65984799.04GPS 22671451G-4/5SID 981915DCB523591.72681572983.35584798.58GPS 22681452G-4/5SID 981915DCB523570.42951572981.61454798.94GPS 22691453G-4/5SID 981915DCB523575.95141572950.33964802.94GPS 22701454G-4/5SID 981915DCB523568.29461572921.78624795.57GPS 22711455G-4/5SID 981915DCB523589.95931572904.35754797.43GPS 22771456G-5/6SID 851915DCB523265.19441572898.23544802.68GPS 22761457G-5/6SID 851915DCB523229.20781572892.41824802.85GPS 22751458G-5/6SID 851915DCB523210.78821572911.75494803.53GPS 22741459G-5/6SID 851915DCB523213.50081572941.44424805.20GPS 22721460G-5/6SID 851915DCB523227.68111572972.07124806.42GPS 22731461G-5/6SID 851915DCB523204.72011572971.52854809.92GPS 22781462G-5/6SID 851915DCB522904.64671572961.26484814.71GPS 22791463G-5/6SID 851915DCB522871.81481572962.07134814.05GPS 22801464G-5/6SID 851915DCB522853.80581572959.98284813.79GPS 22811465G-5/6SID 851915DCB522855.98641572931.82304815.40GPS 22821466G-5/6SID 851915DCB522851.62571572902.51234815.02GPS 22831467G-5/6SID 851915DCB522869.92551572889.42884815.23GPS 22841468G-5/6SID 851915DCB522907.64271572890.56194814.56GPS 1469G-5CB522544.99921572891.71294824.33GPS 1470G-5CB522543.73041572872.30634824.07GPS Page 3 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 1471G-5CB522514.18281572872.97064825.35GPS 1472G-5CB522512.17131572892.31424825.84GPS 1473G-5CB522494.05031572896.06904832.54GPS 1474G-5CB522496.81981572922.78544826.06GPS 1475G-5CB522511.01001572952.89984825.38GPS 1476G-5CB522491.35301572951.18984825.65GPS 1477G-5CB522512.28681572971.89634825.00GPS 1478G-5CB522543.44901572972.59614824.70GPS 1479G-5CB522545.43501572954.58514824.10GPS 1480G-4 CB527311.90581572959.90174749.08GPS 1481G-4 CB527336.47771572191.54944748.48GPS 1482G-4 CB527338.97261572146.98774747.98GPS 1483G-4 CB527414.21831570875.05704750.60GPS 1484H-4SID 547DCB527415.40321570813.24164751.17GPS 1485H-4SID 547DCB527416.63341570749.06844750.08GPS 1486H-4SID 547DCB527425.37871570464.04244751.60GPS 1487H-4SID 547DCB527428.23731570400.51574750.98GPS 1488H-4SID 547DCB527429.26111570090.31924751.36GPS 1489H-4SID 547DCB527431.61861570052.93344751.57GPS 23061490H-3/4SID 444RDCB527456.05291569805.43414753.62GPS 23071491H-3/4SID 444RDCB527458.89581569742.72754753.50GPS 1492I-2CB527476.60921569161.09144749.49GPS 1493I-2CB527474.26821569112.02744749.36GPS 1494I-2CB527464.35461568858.84454754.23GPS 1495I-2CB527458.50721568821.50654755.12GPS 1496I-2CB527463.42631568564.91624754.68GPS 1497I-2CB527464.14171568527.60154756.22GPS 1498I-2CB527455.94911568270.24704755.63GPS 1499I-2CB527456.64881568233.75244756.44GPS 1500J-5CB522379.18721565706.76194823.66GPS 1501J-5CB522327.90241565557.48934822.56GPS 1502J-5CB522423.17851565551.83004820.37GPS 1503J-5CB522487.45931565707.91504821.87GPS 1504J-5CB522818.83981566224.76944818.74GPS 1505J-5CB522992.58281566405.51444816.89GPS 1506J-5CB523179.47511566585.07594813.65GPS 1507J-5CB523125.87561566642.09224814.22GPS 1508I-5CB523459.34671566964.34384811.27GPS 1509I-5CB523512.93821566907.73754812.49GPS 1510I-5CB524097.34671567577.93624799.08GPS 1511I-5CB524150.95781567520.30474799.11GPS 1512I-5CB524667.51701568134.95224791.55GPS 1513I-5CB524649.06971568155.72414790.98GPS 1514I-5CB524770.62161568234.45504788.88GPS 1515I-4CB525094.88131569037.18554785.34GPS 1516H-6CB522106.79821570072.17584821.21GPS 1517H-6CB522096.55661570264.05834818.80GPS 1518H-6CB522067.15601571113.03034825.98GPS 1519H-6CB522069.84701571143.84724826.44GPS 23381520G-5/6SID 851915DCB522075.95161572879.85134833.65GPS 23371521G-5/6SID 851915DCB522080.29261572910.18724832.24GPS 23361522G-5/6SID 851915DCB522076.46601572938.62314831.75GPS 23391523G-5SID 1801919DCB522080.79451573568.88424823.22GPS 23401524G-5SID 1801919DCB522125.03911573571.88584830.04GPS 23411525G-5SID 1801919DCB522122.64641573611.11714822.52GPS 23421526G-5SID 1801919DCB522081.65661573609.51104820.54GPS 23431527G-5SID 3051937DCB522075.53641573928.84134821.75GPS 1528G-5CB522114.89581573929.90334819.82GPS 1S3051529G-5SID 3051937DCB522114.12761573969.98614819.45GPS 2S3051530G-5SID 3051937DCB522076.38491573970.18574823.99GPS 23481531F-5SID 99DCB522067.69081574509.43934827.60GPS 23471532F-5SID 99DCB522068.58051574548.63104824.46GPS 23521533F-5SID 751914DCB522096.67741574880.51294826.60GPS 23491534F-5SID 751914DCB522100.71991574926.43094823.65GPS 23511535F-5SID 751914DCB522063.79641574883.88234827.01GPS 23501536F-5SID 751914DCB522058.12331574923.05084827.66GPS 1537F-5CB524606.03151577078.48414775.16GPS 1538F-5CB524648.67711577079.30134775.63GPS 1539F-5CB524593.90961577026.05334778.17GPS 1540F-5CB524589.81791577068.32854777.68GPS 1541F-5CB524602.09311576855.87284777.54GPS 1542F-5CB524639.93201576850.64984777.04GPS 1543F-5CB524591.25231576479.71284779.55GPS 1544F-5CB524602.60261576144.28064775.30GPS 1545F-5CB524588.90931576088.23044777.53GPS 1546F-5CB524646.48781576080.41194777.64GPS 1547F-5CB524608.01101575776.43104783.23GPS 1548F-5CB524606.14301575702.66094780.99GPS 18S751549F-5SID 751914DCB524628.96611575025.44084779.10GPS 23671550F-5SID 751914DCB524612.97261575003.80374783.49GPS 23681551F-5SID 751914DCB524611.93551574972.30064782.94GPS 19S751552F-5SID 751914DCB524632.04251574950.53494777.68GPS 23701553F-5SID 751914DCB524666.43791574953.75794781.63GPS 23651554F-5SID 751914DCB524665.01351575028.08014778.01GPS 1555G-5CB524642.24011574675.27824786.25GPS 1556G-5CB524648.17451574622.47564787.56GPS 1557G-5CB524692.48391574622.09414786.61GPS 1558G-5CB524697.61721574439.85674785.94GPS 1559G-5CB524642.46491574406.70124787.20GPS 1560G-5CB524638.58321574438.00744790.21GPS 1561G-5CB524662.49711574388.83114788.42GPS 1562G-5CB524698.49351574394.13574787.08GPS 2S2081563G-5SID 2081920DCB524685.37771573366.22004786.39GPS 3S2081564G-4/5SID 353DCB524669.33311573347.24824784.87GPS 4S2081565G-5SID 2081920DCB524666.66181573315.40624782.22GPS 1S2081566G-5SID 2081920DCB524716.55751573365.99724785.68GPS 61S981567G-4/5SID 981915DCB524729.48431573033.97954781.69GPS 39S981568G-4/5SID 981915DCB524696.65251573034.78594783.04GPS 23851569G-4/5SID 981915DCB524677.41401573011.24074783.36GPS 23861570G-4/5SID 981915DCB524681.23871572982.90734782.59GPS 23871571G-4/5SID 981915DCB524676.88591572953.18674782.75GPS 23881572G-4/5SID 981915DCB524694.95771572951.99474780.14GPS 23891573G-4/5SID 981915DCB524729.40421572952.55254782.60GPS 1574G-5CB524698.63831572674.35704780.89GPS 1575G-5CB524701.50061572610.62514781.74GPS 1576G-5CB524711.65031572252.30114786.00GPS 1577G-5CB524707.79571572025.38424784.82GPS 1578G-5CB524726.72031571979.70164783.84GPS 1579H-4CB524843.16651569928.04094788.73GPS 1580I-5CB524808.49911568911.91574785.77GPS 1581I-5CB524794.71781568860.47864785.41GPS 1582I-5CB524851.21871568566.52234783.86GPS 1583I-5CB524813.47801568566.61924784.06GPS 24001584D-7HBR1996RDCB518539.07461579519.86944998.504982.09Plans 24011585D-7HBR1996RDCB518504.64161579518.59444998.404982.94Plans 1586D-7CB518763.81731580892.83064931.38GPS 1587D-7CB518734.88051580861.61334932.03GPS 1588D-7CB518929.80791581735.39644898.58GPS 1589D-7CB518364.44451581697.69724897.39GPS 1590D-5CB524097.77061579969.60864812.12GPS 24071591D-5HB1985RDCB524035.06241580330.82294791.88GPS4804.80-12.92Plans4804.80 24081592D-5HB1985RDCB523999.00121580328.90134791.85GPS4804.50-12.65Plans4804.50 24091593D-5HB1985RDCB523979.81381580388.32104792.20GPS4804.50-12.30Plans4804.50 24101594D-5HB1985RDCB523828.86881580387.78794797.90GPS4809.27-11.37Plans4809.27 24111595D-5HB1985RDCB523826.70421580415.12754797.69GPS4809.40-11.71Plans4809.40 24121596D-5HB1985RDCB524338.87581580402.78894787.87GPS4800.47-12.60Plans4800.47 24131597D-5HB1985RDCB524338.32781580431.39024786.86GPS4800.60-13.74Plans4800.60 24141598D-5HB1985RDCB524543.84801580495.21744786.30GPS4800.80-14.50Plans4800.80 1599D-5CB524580.44731580469.05024786.97GPS 1600D-5CB524660.16581580504.62454786.87GPS 1601D-5CB524807.53851580177.74624788.84GPS 1602D-5CB524293.43731581061.62964771.84GPS 1603D-5CB524469.91811580928.30994777.30GPS 1604D-5CB524371.36571580933.70304775.59GPS 1605D-5CB523817.23491581166.33854784.49GPS 1606D-5CB523780.84921581523.95514764.65GPS 1607D-5CB522946.04001582018.66784805.14GPS 1608D-5CB522686.71991582279.30794796.81GPS 1609D-5CB522720.68931582304.77604796.38GPS 1610D-5CB522915.33931581993.87764803.24GPS 1611D-6CB520256.58401579542.62314940.62GPS in hospital area 1612D-6CB520289.46511579539.25364940.94GPS in hospital area 1613D-6CB520237.47701579597.84004938.79GPS in hospital area 1614D-6CB520221.94901579637.53754941.04GPS in hospital area 1615D-6CB520732.85291580034.04774904.42GPS in hospital area 1616D-6CB520706.28131580050.66484904.62GPS in hospital area 1617D-6CB521038.83101579736.15254892.44GPS in hospital area 1618D-6CB521014.30621579731.58064892.59GPS in hospital area 1619D-6CB521207.22761579682.25774886.74GPS in hospital area 1620D-6CB521253.19521579766.61534885.24GPS in hospital area 1621D-6CB521474.77581579591.70324894.73GPS in hospital area 1622D-6CB521462.89041579869.49244884.11GPS in hospital area 1623D-6CB521495.49271579966.31024881.08GPS in hospital area 1624D-6CB521499.77261579828.56304882.39GPS in hospital area 1625D-6CB521480.12141579826.54574881.87GPS in hospital area 1626D-6CB521453.89551579825.12034883.36GPS in hospital area 1627D-6CB521630.96301579918.14274878.57GPS in hospital area 1628D-6CB521542.31671580005.97174879.75GPS in hospital area 1629D-6CB521646.48331579964.48574878.39GPS in hospital area 1630D-6CB521635.65781579930.02614879.13GPS in hospital area 1631D-6CB521697.13791580061.13654881.04GPS in hospital area 1632D-6CB521778.71271579999.83554877.86GPS in hospital area 1633D-6CB521449.16021580671.79674881.24GPS in hospital area 1634D-6CB521409.72621580674.63064881.13GPS in hospital area 1635D-6CB521364.50151580722.78374882.82GPS in hospital area 1636D-6CB521350.58621580763.94794882.87GPS in hospital area 1637D-6CB521375.73921580650.08504883.57GPS in hospital area 1638D-6CB521412.69411580605.36264883.92GPS in hospital area 1639D-6CB521515.12791580483.03284881.58GPS in hospital area 12191640D-5HB1985RDCB522107.17781580840.58884864.154846.83Plans4854.379.78Plans4854.37 25S6471641D-5HB1985RDCB522119.54901580794.37004863.804846.47Plans4855.678.13Plans4855.67 1642D-5HB1985CB522687.67531580687.73034834.62GPS 1643D-5HB1985CB522695.37361580714.13094834.33GPS 24601644D-5HB1985CB523238.60301580451.03414816.02GPS 24611645D-5HB1985CB523249.63091580474.93474815.88GPS 1646B-5CB522170.57291586525.40304790.56GPS 1647B-5CB522158.43571586559.42274790.21GPS 1648C-5CB523352.45011582302.41854768.10GPS 1649C-5CB523377.80251582777.71624767.86GPS Page 4 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 1650C-5CB523379.85021582927.78784767.89GPS 1651C-5CB523374.84621583103.36224767.77GPS 1652C-5CB522013.85201582800.09544798.08GPS 1653C-5CB522040.08771582801.00834798.32GPS 1654C-5CB522283.89861582407.77954789.38GPS 1655C-5CB522227.54451582522.99324786.64GPS 1656C-5CB522189.64471582531.39424786.77GPS 1657E-5CB524537.29031579552.85254796.44GPS 1658E-5CB524571.72111579554.23004796.09GPS 1659D-6CB521013.90731580351.90674892.28GPS 1660D-6CB521042.96191580376.97314892.12GPS 1661D-6CB520948.14331580358.74834893.38GPS 1662D-6CB520911.61061580381.43024893.68GPS 1663D-6CB521069.33281580285.18214894.23GPS 1664D-6CB521166.90531580245.31304892.19GPS 1665D-6CB521189.22021580279.58254892.12GPS 1666D-6CB521258.74561580162.05744893.98GPS 1667D-6CB520253.32911579541.22754935.66GPS 1668D-6CB520286.20631579538.06314935.40GPS 1669D-6CB521037.20001579478.71704892.49GPS 1670D-6CB521105.52561579509.45844892.37GPS 1671D-6CB521077.62041580280.82864894.31GPS 1672D-6CB519446.56521579599.60764964.15GPS 1673D-6CB519447.06991579573.26164964.74GPS 1674H-2CB531445.04531569453.34494708.81GPS 1675H-2CB531412.97201569671.36734710.75GPS 1676H-2CB531400.79411570049.85234710.19GPS 1677H-2CB531210.56011570044.66734716.73GPS 1678H-2CB530926.84621570037.07504717.74GPS 1679H-2CB530882.46641570041.14664715.10GPS 1680H-2CB530773.81731570145.30614712.30GPS 1681H-2CB530648.45961570265.14324711.68GPS 1682H-2CB530474.17421570455.10984713.50GPS 1683H-2CB530387.80011570338.80264709.92GPS 1684H-2CB530408.89951570008.48194719.08GPS 1685H-2CB530816.07501569738.37594711.40GPS 1686H-2CB530775.08371569736.87224711.24GPS 1687H-2CB531070.25151569746.11984710.72GPS 1688H-2CB531280.13141569668.00044711.93GPS 1689H-2CB531416.09251569765.36334709.67GPS 1690H-3CB530201.38191569449.80854722.90GPS 1691H-3CB530083.82371569419.55864727.27GPS 1692H-3CB530119.39331569447.10864726.51GPS 1693H-3CB530082.05061569340.86844727.25GPS 1694H-3CB530084.58741569465.31074722.79GPS 1695H-3CB529035.56051569494.01464735.52GPS 1696H-3CB528999.44841569494.75804736.65GPS 25131697H-3BSD1994RDCB528461.08881569760.60644738.12GPS 25141698H-3BSD1994RDCB528461.75891569725.64944738.76GPS 25151699H-3/4SID 444RDCB528007.80771569782.37454741.60GPS 1700H-4CB525692.65221570636.64714767.13GPS 1701H-4CB525395.63771571237.23504777.40GPS 1702H-4CB525554.53211571251.04864776.13GPS 1703H-4SID 4691966DCB526145.35601570730.64734767.66GPS 1704H-4SID 4691966DCB526123.44641570675.26004767.78GPS 1705H-4SID 4691966DCB526173.89211570697.14744768.05GPS 25221706H-3/4SID 444RDCB526620.35531569747.16274759.98GPS 25231707H-3/4SID 444RDCB526621.02741569712.10334759.67GPS 1708H-4SID 444CB526163.21191569713.58204757.83GPS 1709I-5CB523994.89201568642.70904798.51GPS 1710I-5CB523795.45001568604.22314797.19GPS 1711I-5CB523713.72721568673.21164805.40GPS 1712I-5CB523677.66411568671.39224803.24GPS 1713I-5CB523674.85571568817.88404799.41GPS 1714I-5CB523673.63521568881.54494799.49GPS 1715I-5CB524393.62311568898.83454785.59GPS 1716I-5CB523870.28181567953.22724799.44GPS 1717I-5CB523869.60571567988.49194799.50GPS 1718I-5CB523702.77191568303.20204796.30GPS 1719I-5CB523330.85601568616.85204808.28GPS 1720I-5CB524384.33761568099.37324791.76GPS 1721I-5CB524375.78671568117.46334789.26GPS 1722I-5CB524314.85701568128.90894789.97GPS 1723I-5CB524532.43261568077.39514791.37GPS 1724I-5CB524430.92991568065.50154793.17GPS 1725I-5CB524009.11911567729.45604796.92GPS 1726I-5CB523464.57791567119.39894804.61GPS 1727I-5CB523450.44881567086.10654804.93GPS 1728I-5CB523365.10551566659.29294811.03GPS 1729I-5CB523475.94151566612.29604813.42GPS 1730I-5CB523935.87021567099.72074799.95GPS 1731I-5CB523935.31601567128.62964800.49GPS 1732I-5CB524175.29261567106.87494794.58GPS 1733I-5CB524174.75211567135.06624794.80GPS 1734I-5CB524508.28671567368.40664790.30GPS 1735I-5CB524553.92581567384.25414790.66GPS 1736I-5CB524486.86461567116.43804792.06GPS 1737I-5CB524484.67601567145.00784792.58GPS 1738I-5CB524832.36221566982.56734786.73GPS 1739J-5CB523081.78881565946.25704807.53GPS 1740J-5CB523079.79191565879.25284807.01GPS 1741J-5CB523067.46341565752.05794806.99GPS 1742J-5CB523038.99731565525.18144803.74GPS 1743J-5CB523017.03511565301.40374804.30GPS 1744J-5CB522993.60141564812.09244804.91GPS 1745J-5CB523046.42961564709.73374803.40GPS 1746J-5CB523274.76771564695.96074799.78GPS 1747J-5CB523483.64251565012.64474796.83GPS 25641748J-5BMS1995RDCB523881.65271565648.60764792.19GPS 25651749J-5BMS1995RDCB523892.14661565614.76194792.19GPS 25661750J-5BMS1995RDCB524229.87351565800.59964785.44GPS 25671751J-5BMS1995RDCB524243.63601565767.43184786.34GPS 25681752J-5BMS1995RDCB524741.65971565808.36184781.55GPS 25691753J-5BMS1995RDCB524744.13931565764.62004781.29GPS 25701754J-5BMS1995RDCB524793.66221565150.05814778.07GPS 25711755J-5BMS1995RDCB524753.78001565176.26434779.86GPS 18BMP11756J-5BMS1995RDCB524316.32551565656.12194787.48GPS 22BMP11757J-5BMS1995RDMH524313.82741565615.25874789.26GPS 1758E-0CB537472.25011579784.26854759.50GPS 25751759E-0BCS, Ph 31998RDCB537625.50471578636.49544733.894701.18Plans4728.815.08Plans4728.81 25761760E-0BCS, Ph 31998RDCB537594.73781578615.19094733.864701.23Plans4727.406.46Plans4727.40 25771761E/F-0BCS, Ph 21996RDCB536473.96691577850.12824698.404666.40Plans4695.303.10Plans4695.30 25781762E/F-0BCS, Ph 21996RDCB536504.75341577870.40764698.404665.51Plans4695.383.02Plans4695.38 1763E-0,F-0CB537327.70011577137.97404654.49GPS 1764E-0,F-0CB537458.73301576807.50614652.13GPS 1765E-0,F-0CB536977.13311576851.70594653.61GPS 25821766E-1BCS, Ph 11993RDCB535178.10991578943.91224714.574683.35Plans 25831767E-1BCS, Ph 11993RDCB535216.30771578919.92954714.284682.19Plans 25841768E-1BCS, Ph 11993RDCB535240.72551578501.89124708.354676.74Plans4705.223.13Plans4705.22 25851769E-1BCS, Ph 11993RDCB535204.66081578500.17484708.354676.99Plans4705.003.35Plans4705.00 25861770E-1BCS, Ph 11993RDCB535256.16841578038.45664703.704670.91Plans4700.553.15Plans4700.55 25871771E-1BCS, Ph 11993RDCB535219.93091578045.76124703.704671.20Plans4700.513.19Plans4700.51 25881772E-1BCS, Ph 11993RDCB535012.71601577813.61714701.944665.26Plans4698.363.58Plans4698.36 25891773E-1BCS, Ph 11993RDCB535023.22311577779.05404701.944665.47Plans4697.844.10Plans4697.84 25901774E-1BCS, Ph 11993RDCB534797.65191577819.85384699.764663.52Plans4696.763.00Plans4696.76 25911775E-1BCS, Ph 11993RDCB534783.54031577785.63944699.764663.61Plans4696.583.18Plans4696.58 25921776E-1BCS, Ph 11993RDCB534515.35351578080.97194701.674668.10Plans4699.032.64Plans4699.03 25931777E-1BCS, Ph 11993RDCB534489.59941578054.94354701.674667.57Plans4698.063.61Plans4698.06 25941778E-1CB534511.26191578123.24674667.66GPS 25951779E-1BCS, Ph 11993RDCB534405.99871578307.66564703.104669.10Plans4700.422.68Plans4700.42 25961780E-1BCS, Ph 11993RDCB534442.09091578307.94704703.104669.81Plans4700.222.88Plans4700.22 25971781E-1BCS, Ph 11993RDCB534396.61971578797.16214708.774675.01Plans4706.002.77Plans4706.00 25981782E-1BCS, Ph 11993RDCB534470.96941579198.53164717.384683.20Plans4711.615.77Plans4711.61 25991783E-1BCS, Ph 11993RDCB534356.36401579271.09474716.034681.66Plans4712.683.35Plans4712.68 25601784E-1BCS, Ph 11993RDCB534343.89841579236.60414716.034681.68Plans4712.463.57Plans4712.46 26011785E-1BCS, Ph 11993RDCB534528.43561579367.81454720.594686.12Plans 26021786E-1BCS, Ph 11993RDCB534495.21141579389.12364720.954686.44Plans 1787E-1CB534785.53841579565.32924687.83GPS 1788E-1CB534880.73331579820.75904690.28GPS 26051789E-1BCS, Ph 11993RDCB534236.48531578762.50854709.704678.41Plans4706.882.82Plans4706.88 26061790E-1BCS, Ph 11993RDCB534239.08021578798.34814709.074678.23Plans4709.70-0.63Plans4709.70 26121791F-5SID 99DCB521715.03181574503.29594844.50GPS 26111792F-5SID 99DCB521712.11681574484.16564844.15GPS 26071793F-5SID 99DCB521717.65011574537.90604841.75GPS 26081794F-5SID 99DCB521679.91331574537.79804842.45GPS 26091795F-5SID 99DCB521658.62581574535.54424847.76GPS 26101796F/G-6SID 99DCB521675.70581574500.49134847.57GPS 26131797G-6SID 228DCB521354.21471574494.74014847.14GPS 26141798G-6SID 228DCB521297.78321574528.32114858.84GPS 26151799G-6SID 228DCB521303.34431574494.99584849.77GPS 26161800G-6SID 228DCB521323.03481574494.96304849.48GPS 26181801G-6SID 228DCB520993.37591574487.31204858.51GPS 24S2281802G-6SID 228DCB520992.12861574466.77774857.79GPS 26191803F/G-6SID 2271921DCB520962.88331574537.28554857.64GPS 26201804G-6SID 228DCB520941.91211574518.52684862.07GPS 26211805G-6SID 228DCB520945.88221574482.60734859.24GPS 26221806F/G-6SID 2271921DCB520963.91281574483.56824858.65GPS 26231807G-6SID 228DCB520965.87131574466.99244856.53GPS 26241808F/G-6SID 2271921DCB520963.29061574344.80414856.02GPS 26251809F/G-6SID 2271921DCB520962.28301574311.76324856.59GPS 26261810G-6SID 228DCB520637.46941574479.36294863.02GPS 26271811G-6SID 228DCB520633.53081574513.64234860.23GPS 26281812G-6SID 228DCB520605.68041574511.36514860.79GPS 26291813G-6SID 228DCB520604.67281574478.32424861.40GPS 26301814G-6SID 228DCB520608.31281574459.62704861.68GPS 26311815G-6SID 228DCB520583.37941574476.37794861.14GPS 26321816G-6SID 228DCB520581.06141574511.71374859.98GPS 1817G-6SID 371CB520278.59671574454.94894865.68GPS 1818G-6SID 371CB520221.93321574500.62654867.75GPS 1819G-6SID 371CB520222.59731574465.97684866.67GPS 1820G-6SID 371CB520242.52161574453.74474866.36GPS 1821G-6SID 371CB519881.70201574445.29144869.36GPS 1822G-6SID 371CB519919.43101574445.80944868.84GPS 1823G-6SID 371CB519861.08221574493.81334868.32GPS 1824G-6SID 371CB519861.76001574458.44604869.06GPS 1825G-6SID 372CB519871.24001573878.18564875.34GPS 1826G-6SID 372CB519868.91211573914.03404874.34GPS 1827G-6SID 372CB519889.53981573865.10204875.74GPS 1828G-6SID 372CB519925.61881573866.10124877.10GPS Page 5 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 26451829G-6SID 239DCB519875.88111573550.41704879.75GPS 26461830G-6SID 239DCB519874.77921573522.29674878.76GPS 14S2391831G-6SID 239DCB519929.39191573498.01324879.80GPS 26481832G-6SID 239DCB520233.93501573531.94914875.62GPS 26491833G-6SID 239DCB520288.06831573532.67914874.88GPS 1834G-6SID 372CB520231.36601573922.82664872.57GPS 1835G-6SID 372CB520230.41151573887.01774875.32GPS 1836G-6SID 372CB520250.34371573874.37574874.92GPS 1837G-6SID 372CB520286.43061573874.96484874.67GPS 1838G-6SID 372CB520590.53941573931.55624874.23GPS 1839G-6SID 372CB520614.55561573877.04894869.35GPS 1840G-6SID 372CB520645.71781573877.74874868.94GPS 1841G-6CB520565.27171573537.68424875.45GPS 26601842G-6SID 239DCB520587.07011573513.28464877.13GPS 26611843G-6SID 239DCB520611.70681573512.01334875.94GPS 26641844G-6SID 239DCB520655.98891573513.06714873.44GPS 1845G-6SID 239DCB520678.94221573514.01984873.25GPS 26571846G-6SID 239DCB520648.29631573571.98944876.61GPS 26581847G-6SID 239DCB520617.16941573569.44444876.82GPS 26591848G-6SID 239DCB520592.57201573568.66534874.76GPS 3S2391849G-6SID 239DCB520860.43111573547.54594870.98GPS 26661850G-6SID 239DCB521008.05691573550.06764868.58GPS 26671851G-6SID 239DCB520976.30531573580.12194869.92GPS 26681852F/G-6SID 2271921DCB520948.72471573906.21994867.50GPS 26691853F/G-6SID 2271921DCB520946.47541573937.96774864.52GPS 1854G-6CB521663.63931574359.55944846.10GPS 1855G-6CB521662.59251574328.56894846.12GPS 1856G-6CB521682.60521574311.72384844.82GPS 1857G-6CB521715.40961574312.35254843.36GPS 26741858G-6SID 2931935DCB521684.86291573594.62514852.36GPS 26751859G-6SID 2931935DCB521678.89151573563.74524848.23GPS 26761860G-6SID 2931935DCB521700.58371573544.88134850.09GPS 26771861G-6SID 2931935DCB521733.36851573546.53524840.70GPS 26781862G-6SID 2931935DCB521728.74411573616.59164842.75GPS 26791863G-6SID 2931935DCB521681.29911573266.90494849.66GPS 26801864G-6SID 2931935DCB521678.65721573233.52524852.11GPS 26811865G-6SID 2931935DCB521701.98181573215.10274846.74GPS 26821866G-6SID 2931935DCB521733.14991573215.49504846.29GPS 26851867G-6SID 851915DCB521707.07271572949.48964839.97GPS 26861868G-6SID 851915DCB521686.12121572929.70584841.08GPS 12S851869G-6SID 851915DCB521675.77531572870.23284842.13GPS 26841870G-6SID 851915DCB521736.60261572949.74794842.51GPS 26831871G-5/6SID 851915DCB521738.57881572932.24954842.06GPS 26941872F-5SID 99DCB522474.12721574534.86754832.66GPS 26931873F-5SID 99DCB522457.74081574533.73304825.62GPS 26921874F-5SID 99DCB522453.82971574566.57704820.04GPS 26911875F-5SID 99DCB522480.09081574566.15744815.58GPS 26901876F-5SID 99DCB522478.12841574582.93824817.85GPS 18S991877F-5SID 99DCB522505.88441574590.13604833.83GPS 26881878F-5SID 99DCB522517.78841574568.31564817.75GPS 26961879F-5SID 99DCB522518.52321574529.97544818.56GPS 26951880F-5SID 99DCB522522.19461574509.63804824.34GPS 1881G-5CB522831.33391574389.32214809.06GPS 1882G-5CB522831.88791574360.41324810.93GPS 1883G-5CB522845.87781574400.98404812.00GPS 1884G-5CB522880.31061574402.25924809.47GPS 27051885F-5SID 99DCB522874.24621574547.45824808.79GPS 27011886F-5SID 99DCB522873.61751574580.26254812.98GPS 27021887F-5SID 99DCB522839.18471574578.98724811.86GPS 27031888F-5SID 99DCB522821.13051574579.25664809.98GPS 27041889F-5SID 99DCB522828.33581574545.75784813.75GPS 27091890F-5SID 99DCB523179.13811574563.14634803.89GPS 27101891F-5SID 99DCB523198.83841574562.60094803.95GPS 27081892F-5SID 99DCB523180.16531574595.16194803.48GPS 27071893F-5SID 99DCB523203.09891574597.13974808.15GPS 27061894F-5SID 99DCB523235.90921574597.46084806.57GPS 27111895F-5SID 99DCB523239.84191574563.48924805.47GPS 1896G-5CB523237.92711574406.54924802.87GPS 1897G-5CB523190.99351574372.62824804.04GPS 1898G-5CB523188.82671574400.07034802.34GPS 1899G-5CB523203.48851574405.58154802.42GPS 1900G-5CB523543.07231574409.01304798.10GPS 1901G-5CB523543.64011574379.38674796.25GPS 1902G-5CB523564.95711574380.10284795.45GPS 1903G-5CB523566.87821574365.47484795.32GPS 1904G-5CB523594.79331574364.36904794.40GPS 1905G-5CB523594.48681574380.36124794.98GPS 1906G-5CB523593.88371574411.83274797.05GPS 1907G-5CB523564.38531574409.93434797.67GPS 27281908F-5SID 99DCB523548.12601574573.39694798.09GPS 27271909F-5SID 99DCB523541.49641574576.85924802.92GPS 27261910F-5SID 99DCB523537.57351574610.31824799.17GPS 27251911F-5SID 99DCB523555.57271574612.91934796.56GPS 27241912F-5SID 99DCB523586.76631574611.97894802.55GPS 27291913F-5SID 99DCB523593.96761574578.68514796.79GPS 27331914F-5SID 99DCB523889.08871574590.49414802.74GPS 27341915F-5SID 99DCB523908.78701574590.05134805.90GPS 27321916F-5SID 99DCB523894.96591574626.29464800.93GPS 27311917F-5SID 99DCB523914.57971574630.25984793.52GPS 27301918F-5SID 99DCB523952.29291574631.59794791.54GPS 27351919F-5SID 99DCB523946.48451574592.20954801.01GPS 27381920G-5SID 1451916DCB523951.09531574437.24054792.23GPS 27371921G-5SID 1451916DCB523957.93311574422.91184794.48GPS 27391922G-5SID 1451916DCB523919.92331574437.05324795.03GPS 27401923G-5SID 1451916DCB523920.22581574421.26624794.68GPS 27411924G-5SID 1451916DCB523898.99151574416.24444802.22GPS 27421925G-5SID 1451916DCB523901.14641574389.41734797.94GPS 27431926G-5SID 1451916DCB523920.83491574389.48704795.36GPS 27441927G-5SID 1451916DCB523921.12571574374.31504796.73GPS 27361928G-5SID 1451916DCB523953.61171574391.55094797.38GPS 27451929G-5SID 1451916DCB523955.55651574375.69274798.44GPS 27461930G-5SID 1451916DCB523957.11081574208.97434793.53GPS 27471931G-5SID 1451916DCB523927.60461574207.48594795.31GPS 1932G-5CB524261.91331574400.53604794.44GPS 1933G-5CB524281.61951574399.68304793.70GPS 1934G-5CB524283.57211574383.41494792.78GPS 1935G-5CB524311.50881574381.18144792.73GPS 1936G-5CB524312.86611574395.97484786.70GPS 1937G-5CB524313.83831574430.86084788.82GPS 1938G-5CB524311.89561574446.61654786.90GPS 1939G-5CB524275.79901574446.53994791.04GPS 1940G-5CB524276.11531574430.03524793.58GPS 1941G-5CB524263.01921574428.45114792.39GPS 27691942G-5CB524274.29971574610.38794793.54GPS 27611943F-5SID 99DCB524257.89951574609.97104798.20GPS 27601944F-5SID 99DCB524257.23941574644.41554797.80GPS 27591945F-5SID 99DCB524271.94641574647.56884796.93GPS 27621946F-5SID 99DCB524311.65341574630.48594793.98GPS 27631947G-5SID 3051937DCB522470.07481573975.78264820.86GPS 27641948G-5SID 3051937DCB522472.32011573944.23974820.83GPS 27651949G-5SID 3051937DCB522492.37611573925.13944819.68GPS 27661950G-5SID 3051937DCB522523.55201573925.12164817.34GPS 27671951G-5SID 3051937DCB522523.88961573993.11964823.06GPS 27691952G-5SID 1801919DCB522499.91841573617.21984817.45GPS 27701953G-5SID 1801919DCB522478.63871573614.55584818.42GPS 27711954G-5SID 1801919DCB522487.38021573586.52184827.72GPS 27721955G-5SID 1801919DCB522502.15981573585.88214826.78GPS 27731956G-5SID 1801919DCB522500.89881573566.06554825.78GPS 6S1801957G-5SID 1801919DCB522530.41881573566.83634823.78GPS 27681958G-5SID 1801919DCB522531.06091573618.94474821.84GPS 27771959G-5SID 1801919DCB522837.72281573627.89874810.99GPS 27781960G-5SID 1801919DCB522838.34951573595.19684813.05GPS 27791961G-5SID 1801919DCB522856.40371573594.92754811.68GPS 27801962G-5SID 1801919DCB522858.42711573574.96884811.04GPS 27811963G-5SID 1801919DCB522889.58531573575.87374810.43GPS 27821964G-5SID 1801919DCB522890.85221573595.38274809.36GPS 27751965G-5SID 1801919DCB522888.55971573629.38584810.30GPS 27761966G-5SID 1801919DCB522857.42901573627.04584811.90GPS 6S3051967G-5SID 3051937DCB522853.21031573932.77284811.84GPS 27851968G-5SID 3051937DCB522848.47991574008.36504811.92GPS 5S3051969G-5SID 3051937DCB522832.58271573981.70474822.20GPS 27861970G-5SID 3051937DCB523206.40501573996.56044804.23GPS 27871971G-5SID 3051937DCB523242.49961573996.73944802.80GPS 27881972G-5SID 3051937DCB523243.11261573964.75524802.81GPS 27891973G-5SID 3051937DCB523210.32201573963.40894803.39GPS 27911974G-5SID 1801919DCB523218.19241573638.36984805.88GPS 1S1801975G-5SID 1801919DCB523200.18341573636.28134805.70GPS 27921976G-5SID 1801919DCB523217.18291573605.43154802.38GPS 5S1461977G-5SID 1461917DCB523568.19971573954.06474799.70GPS 27951978G-5SID 1461917DCB523601.05321573952.13064804.65GPS 27941979G-5SID 1461917DCB523600.61311573975.09364796.82GPS 27961980G-5SID 1461917DCB523565.54771574006.82784798.72GPS 27971981G-5SID 1461917DCB523545.88671574005.32294799.13GPS 27931982G-5CB523567.84611573972.51714802.21GPS 27991983G-5SID 1461917DCB523596.77471574004.14464815.05GPS 28021984G-5SID 1451916DCB523927.93921574018.79814804.01GPS 28011985G-5SID 1451916DCB523957.47291574018.85154798.50GPS 28001986G-5SID 1451916DCB523973.86131574019.88334798.82GPS 28091987G-5SID 1451916DCB523977.74101573988.67974795.06GPS 28081988G-5SID 1451916DCB523959.73011573986.69364794.27GPS 28071989G-5SID 1451916DCB523963.40931573965.94634797.18GPS 28061990G-5SID 1451916DCB523927.32071573965.45974801.95GPS 28051991G-5SID 1451916DCB523923.60801573987.94994800.08GPS 28041992G-5SID 1451916DCB523908.87161573986.33424797.72GPS 28031993G-5SID 1451916DCB523911.58031574016.22854798.62GPS 28101994G-4/5SID 353DCB523936.45011573660.33994790.43GPS 28111995G-4/5SID 353DCB523933.79641573627.57524791.04GPS 28121996G-4/5SID 353DCB523968.24101573628.23544792.04GPS 28131997G-4/5SID 353DCB524329.54931573354.27264789.54GPS 28141998G-4/5SID 353DCB524298.40091573352.85534789.32GPS 28151999G-4/5SID 353DCB524282.31511573336.03624790.00GPS 28162000G-4/5SID 353DCB524281.27221573304.84064789.57GPS 28172001G-4/5SID 353DCB523973.68731573344.06804794.56GPS 28182002G-4/5SID 353DCB523940.90261573342.41414794.53GPS 28192003G-4/5SID 353DCB523926.43351573326.85664794.84GPS 28202004G-4/5SID 353DCB523928.65921573296.33914797.94GPS 2005G-5CB524309.98991572662.60064785.44GPS 2006G-5CB524309.54621572600.13864784.41GPS 2007G-5CB523952.06181572588.97954791.13GPS Page 6 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 2008G-5CB523952.49551572651.95434791.08GPS 2009G-5CB523593.33141572642.81404798.07GPS 2010G-5CB523579.53221572592.29954798.88GPS 2011G-5CB522517.80441572255.98884819.13GPS 2012G-5CB522866.47391572213.44724811.34GPS 2013G-5CB522878.62691572264.23794810.58GPS 2014G-5CB523239.41781572274.12734803.96GPS 2015G-5CB523238.99191572210.74254801.27GPS 2016G-5CB523596.92021572284.36394797.73GPS 2017G-5CB523598.13451572221.01044797.15GPS 2018G-5CB523957.29281572230.45844797.19GPS 2019G-5CB523957.69711572294.97084794.62GPS 2020G-5CB524319.69591572241.81434792.11GPS 2021F-6CB519385.49281574823.22184867.49GPS 2022F-6SID 389CB519856.17811574835.31884866.35GPS 2023F-6SID 389CB520218.66741574842.26574859.10GPS 2024F-6SID 389CB520279.38321574841.99364861.97GPS 2025F-6SID 389CB520589.56991574838.29834856.00GPS 2026F-6SID 389CB520622.50011574832.36614855.27GPS 28432027F/G-6SID 2271921DCB520920.52341574864.02324865.70GPS 28442028F/G-6SID 2271921DCB520941.91111574861.04884856.60GPS 2029F-6CB521290.17841575610.09314840.45GPS 2030F-6CB521329.60071575607.87474840.01GPS 28472031F-6SID 455RDCB521012.71971575618.41544829.48GPS 28482032F-6SID 455RDCB521013.68221575653.81414828.64GPS 28492033F-6SID 449RDCB521166.74991576571.09634822.61GPS 28502034F-6SID 449RDCB521132.76691576546.34554823.06GPS 2035F-6CB521113.67151576600.94714823.43GPS 28522036F-6SID 449RDCB521162.15711576810.77364822.84GPS 28532037F-6SID 449RDCB521126.05451576811.00474821.81GPS 28542038F-6SID 449RDCB521111.98001576860.47254823.16GPS 28552039F-6SID 449RDCB520545.76961576867.05644832.40GPS 28562040F-6SID 449RDCB520533.61431576816.36814832.64GPS 28572041F-6SID 449RDCB520553.62521576542.73394831.45GPS 28582042F-6SID 449RDCB520552.39941576606.70254831.70GPS 2043F-6CB520924.10351576304.01734825.90GPS 28602044F-6SID 449RDCB520594.67031576284.57784829.22GPS 28612045F-6SID 449RDCB520557.36941576347.34244830.67GPS 28622046F-6SID 449RDCB520560.23551576283.40524830.21GPS 2047F-6CB520566.86551576023.05134833.00GPS 2048F-6CB520565.64161576086.91754834.02GPS 28692049F-5SID 751914DCB522449.05731574901.21314813.93GPS 28702050F-5SID 751914DCB522468.75761574900.66774814.27GPS 28722051F-5CB522450.02761574936.20174814.53GPS 28682052F-5SID 751914DCB522469.67881574938.21914813.94GPS 28672053F-5SID 751914DCB522469.34281574955.74904814.66GPS 28662054F-5SID 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751914DCB524245.64501574992.55954790.20GPS 29052089F-5SID 751914DCB524263.66571574994.03294788.07GPS 29072090F-5SID 751914DCB524246.22651574962.21564787.68GPS 29082091F-5SID 751914DCB524264.28651574961.63874790.54GPS 29092092F-5SID 751914DCB524266.30391574941.98764786.69GPS 29102093F-5SID 751914DCB524302.38871574942.67914787.92GPS 29112094F-5SID 751914DCB524302.02331574961.74664788.63GPS 29042095F-5SID 751914DCB524301.38281574995.16604789.04GPS 2096F-5CB524286.27951575697.65934785.01GPS 2097F-5CB524250.19081575697.17284785.56GPS 2098F-5CB524249.85881575714.49774784.86GPS 2099F-5CB524244.26231575749.66794780.29GPS 2100F-5CB524231.81841575714.04934779.18GPS 2101F-5CB522808.54431575664.11054805.96GPS 2102F-5CB522810.52831575646.20204805.60GPS 2103F-5CB522844.94151575648.50234804.95GPS 2104F-5CB522846.24971575665.85864806.37GPS 2105F-5CB522840.70231575698.46624808.60GPS 2106F-5CB522791.49771575697.42064804.25GPS 2107F-5CB522788.77131575668.44904808.01GPS 2108F-5CB523033.81191575724.93324795.45GPS 2109F-5CB523032.51551575706.96194795.72GPS 2110F-5CB523068.54921575710.31884796.15GPS 2111F-5CB523066.59861575726.48454794.39GPS 2112F-5CB523147.31891575709.77734795.43GPS 2113F-5CB523149.57601575677.61944796.82GPS 2114F-5CB523166.00181575676.70354794.99GPS 2115F-5CB523167.93671575661.35804796.52GPS 2116F-5CB523200.74891575661.57664793.18GPS 2117F-5CB523202.06101575678.72774794.50GPS 2118F-5CB523194.89901575709.97124804.32GPS 2119F-5CB523509.67531575723.59224797.61GPS 2120F-5CB523513.59031575690.54324781.05GPS 2121F-5CB523529.99051575690.96004787.19GPS 2122F-5CB523530.37361575670.96984790.28GPS 2123F-5CB523564.78471575673.37274788.40GPS 2124F-5CB523567.71941575691.47794791.50GPS 2125F-5CB523562.14261575725.62324788.03GPS 2126F-5CB523868.78261575735.70414784.94GPS 2127F-5CB523886.79741575737.48504784.46GPS 2128F-5CB523889.74001575755.18024784.82GPS 2129F-5CB523872.67201575703.98784787.55GPS 2130F-5CB523890.71441575704.33354789.30GPS 2131F-5CB523892.71611575685.50244787.61GPS 2132F-5CB523925.51651575686.33614785.92GPS 2133F-5CB523926.82071575703.89734790.71GPS 2134F-5CB523924.14721575757.78804783.95GPS 2135F-5CB523924.50671575739.02804788.77GPS 2136F-5CB524254.70621576060.90564784.74GPS 2137F-5CB524289.23121576057.36264783.12GPS 2138F-5CB524248.21981576142.51454781.98GPS 2139F-5CB524246.93721576123.82574782.40GPS 2140F-5CB524232.19291576122.62024780.55GPS 2141F-5CB524231.10271576093.88494782.75GPS 2142F-5CB523920.42031576123.51664794.98GPS 2143F-5CB523925.94011576092.34424787.73GPS 2144F-5CB523884.92881576091.86604794.72GPS 2145F-5CB523866.87661576092.03294795.57GPS 2146F-5CB523867.98051576120.05044794.14GPS 2147F-5CB523482.98531576088.88094784.75GPS 2148F-5CB523477.44981576120.87334800.43GPS 2149F-5CB523065.01281576066.10394796.23GPS 2150F-5CB523061.35321576085.82614803.65GPS 2151F-5CB523059.09031576118.29154797.40GPS 2152F-5CB523029.54871576118.64844797.51GPS 2153F-5CB523008.24751576117.11204797.34GPS 2154F-5CB523008.80141576088.20324798.64GPS 2155F-5CB523031.80381576086.59304800.29GPS 2156F-5CB523033.77601576069.29964802.42GPS 2157F-5CB524230.40491576472.79804783.40GPS 2158F-5CB524248.43941576473.55384782.06GPS 2159F-5CB524248.09761576491.39114781.24GPS 2160F-5CB524231.02371576440.50634780.75GPS 2161F-5CB524250.74361576438.93574782.65GPS 2162F-5CB524249.43741576421.47694781.30GPS 2163F-5CB524283.86821576422.85454780.20GPS 2164F-5CB524285.18031576440.00574780.39GPS 2165F-5CB524284.52611576474.14284780.81GPS 2166F-5CB524282.53821576492.25624781.48GPS 2167F-5CB524225.91031576792.97904783.95GPS 2168F-5CB524240.67221576793.26194785.66GPS 2169F-5CB524276.38571576813.32844782.09GPS 2170F-5CB524239.97091576829.85914783.97GPS 2171F-5CB524223.55501576830.26244788.76GPS 2172F-5CB524272.68671577006.36124782.88GPS 2173F-5CB524239.87651577006.04024782.07GPS 2174E-4CB525364.06661578621.01934771.53GPS 2175E-4CB525329.71251578615.64374767.28GPS 2176E-4CB525222.28931578655.83654769.11GPS 2177E-4CB525245.98511578703.66914768.59GPS 2178E-4CB525764.74011578518.96684761.52GPS 2179E-4CB525734.24591578483.41274762.37GPS 2180E-4CB525772.50311578456.35444761.26GPS 2181E-4CB526124.10251578945.90094752.85GPS 2182E-4CB526102.01751578899.63754755.92GPS 2183E-4CB526901.03861579159.42794739.60GPS 2184E-4CB526887.12521579114.85944741.14GPS 2185 E-4CB 526155.36951577999.13484757.92GPS 2186 E-4CB 526120.96831577996.21944759.67GPS Page 7 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 2187 E-4CB 526102.93971577995.15614757.96GPS 2188 E-4CB 526103.53291577964.19714759.01GPS 2189 E-4CB 526121.60081577963.21024757.81GPS 30062190 E-4CB 526121.92881577946.09054758.09GPS 30072191 E-4CB 526153.08891577946.89264757.42GPS 2192 E-4CB 526154.37161577965.58154757.24GPS 2193 E-4CB 526543.89941578017.03964755.85GPS 2194 E-4CB 526541.21411577985.91534751.58GPS 2195 E-4CB 526559.27801577985.13324748.87GPS 2196 E-4CB 526566.22781577964.96144754.52GPS 2197 E-4CB 526597.37221577966.58374753.23GPS 2198 E-4CB 526597.01271577985.34364753.37GPS 2199 E-4CB 526597.99491578019.71694753.57GPS 2200 E-4CB 526563.56421578018.33934755.23GPS 2201E-4CB525779.25791577932.55114764.41GPS 2202E-4CB525743.16741577932.16724764.15GPS 2203E-4CB525740.39571577991.18354763.44GPS 2204F-4CB525765.88941576146.98554762.60GPS 13892205F-4CB525767.09171576084.24744761.91GPS 30222206F-4SID 408DCB525785.28941575049.03664769.68GPS 30232207F/G-4SID 408DCB525763.66991575064.10754769.44GPS 30242208F/G-4SID 408DCB525789.33791575009.01684763.44GPS 30252209F/G-4SID 408DCB525727.07861575004.23434780.24GPS 2210F-4CB525715.44391575012.01034764.87GPS 30282211F/G-4SID 408DCB525713.18091575044.47574763.85GPS 2212F-4CB525735.77451575064.18824766.68GPS 30292213F-4SID 408DCB525984.76681575000.04574758.48GPS 30302214F/G-4SID 408DCB525977.21981575051.38174761.19GPS 2215F-4CB526334.80371575057.31164757.06GPS 2216F-4SID 424CB526909.98481575353.01554746.04GPS 2217F-4SID 424CB526907.12071575416.84994748.12GPS 30342218F-4SID 466DCB526028.96731575347.82254759.45GPS 30352219F-4SID 466DCB525965.05011575343.93144761.09GPS 30362220F-4SID 466DCB525957.79571575379.99284762.70GPS 30372221F-4CB525972.66891575716.95254763.80GPS 30382222F-4CB526016.99391575715.75104762.29GPS 30392223F-4CB525973.15791575777.05684763.88GPS 2224F-4CB526334.16761575775.46324763.23GPS 2225F-4CB526335.21871575720.61864761.37GPS 2226F-4CB526904.63721575717.68634749.11GPS 2227F-4CB526906.67801575782.43504753.73GPS 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2251F-4MH524807.49081575641.70734781.68GPS 2252F-4MH524796.51011575700.97644778.50GPS 2253F-4CB524815.78181575894.03924777.36GPS 2254F-4CB524811.58791575941.64504776.10GPS 2255F-4CB524816.64791576020.09104777.83GPS 2256F-4CB524811.26751576043.98494778.65GPS 2257F-4CB524811.98441576092.19764776.60GPS 2258F-4CB524809.67431576127.12324772.64GPS 2259F-4CB524727.34731576142.05644773.24GPS 2260F-4CB524694.09501576250.43084773.62GPS 2261F-4CB524697.24001576171.93714774.04GPS 2262F-4CB524756.30541576172.14604772.26GPS 2263F-4CB524809.92951576285.05674771.39GPS 2264F-4CB524809.11231576327.70234771.05GPS 2265F-4CB524814.44731576391.79644773.41GPS 2266F-4CB524835.57761576402.25134765.61GPS 2267F-4CB524761.44761576503.17684774.61GPS 2268F-4CB524763.86961576548.03804774.99GPS 30852269F/G-4SID 408DCB525741.78261574665.07254765.85GPS 30862270F/G-4SID 408DCB525725.10931574678.90504768.67GPS 30872271G-4CB525980.98051574683.91134762.13GPS 30882272G-4CB526043.26731574687.25854762.97GPS 30892273G-4CB526352.42261574737.28024758.73GPS 30902274G-4CB526340.29111574685.36214760.59GPS 30912275F-4CB526919.44871574687.94974749.47GPS 30922276F-4CB526918.49591574737.66864751.14GPS 30932277F/G-4SID 408DCB526919.60441574508.59134751.79GPS 30942278F/G-4SID 408DCB526955.74211574506.51504750.20GPS 30952279F/G-4SID 408DCB526919.58141574338.56174752.64GPS 2280G-4CB526361.16501574366.72634764.13GPS 2281G-4CB526370.96821574026.44524767.70GPS 2282G-4CB526407.08041574025.70174768.00GPS 2283G-4CB525997.51821574077.84464777.08GPS 2284G-4CB525998.20001574042.27244773.46GPS 2285G-4CB525750.69681574028.70964777.86GPS 2286G-4CB526918.64251573788.25594765.15GPS 2287G-4CB526914.42131573751.66694764.73GPS 31042288G-4SID 433DCB526380.97221573162.030573.404760.50Plans 2289G-4CB526044.84071573149.74274766.29GPS 2290G-4CB526019.53061573100.54594766.77GPS 2291G-4CB526020.46741573137.27714767.94GPS 2292G-4CB525774.18601573145.58084772.84GPS 2293G-4CB525781.05701572787.09184766.67GPS 2294G-4CB525768.91381572735.78864768.80GPS 2295G-4CB526029.00421572777.48704766.25GPS 2296G-4CB526029.70171572741.09484768.48GPS 31132297G-4SID 433DCB526392.37911572738.098774.504759.65Plans 31142298G-4SID 433DCB526431.76971572737.520574.504762.53Plans 31152299G-4SID 433DCB526424.06061572968.522472.624761.70Plans 31162300G-4SID 433DCB526390.37261572928.394772.624762.67Plans 31172301G-4SID 427DCB526386.84141572427.77614764.20GPS 31182302G-4SID 427DCB526386.14971572463.86084764.09GPS 2303G-4CB525831.98591572098.92564769.04GPS 2304G-4CB525796.45491572154.95524772.08GPS 2305G-4CB526039.14791572419.47104762.26GPS 2306G-4CB526039.82381572384.20654765.18GPS 2307G-4CB525794.09451572363.70374768.07GPS 2308G-4CB525256.25171572773.75144775.86GPS 2309H-5CB522534.86311571537.22584812.66GPS 2310H-5CB522550.96541570868.38714821.02GPS 2311H-5CB522548.09311570932.63184823.46GPS 2312H-5CB522906.77291570881.46324813.27GPS 2313H-5CB522907.18101570945.77074812.89GPS 2314H-5CB522900.34521571216.78524810.73GPS 2315H-5CB522899.11901571280.75374810.96GPS 2316H-5CB522893.90391571552.82484810.54GPS 2317H-5CB522878.20661571601.33844808.53GPS 2318H-5CB523238.86391571618.19894807.34GPS 2319H-5CB523252.96421571567.39874808.42GPS 2320H-5CB523245.32671571281.03174807.64GPS 2321H-5CB523262.67611571231.93464809.73GPS 2322H-5CB523253.42021570944.40864809.12GPS 2323H-5CB523267.49101570895.14614809.24GPS 2324H-5CB523618.74101570632.37464804.82GPS 2325H-5CB523619.45631570595.05974805.51GPS 2326H-5CB523626.59831570907.25994805.62GPS 2327H-5CB523612.46651570959.70034811.34GPS 2328H-5CB523667.35021570921.27024802.44GPS 2329H-5CB523621.72631571247.02124797.67GPS 2330H-5CB523669.04111571261.05474796.58GPS 2331H-5CB523606.04081571294.91964798.75GPS 2332H-5CB523613.62131571584.25934800.57GPS 2333H-5CB523601.18081571634.06584802.95GPS 2334H-5CB523651.34031571585.29004801.25GPS 2335H-5CB524341.46191571705.47904789.61GPS 2336H-5CB524383.57311571734.18014788.90GPS 2337H-5CB524534.90121571714.72474789.00GPS 2338H-5CB524567.86951571878.00264790.01GPS 2339H-5CB524732.81311571747.43764787.56GPS 2340H-5CB524755.09791570670.46334792.68GPS 2341H-5CB524760.69451570635.29294793.54GPS 2342H-5CB523643.81721570180.19434797.75GPS 2343H-5CB523679.76641570187.95954797.63GPS 2344H-5CB524365.04971570046.96184791.05GPS 2345H-5CB524401.12461570048.16614791.85GPS 2346H-5CB524418.16541569330.42994791.97GPS 2347H-5CB524383.72681569329.46204792.48GPS 2348H-5CB523661.62311569336.94954801.88GPS 2349H-5CB523697.70981569337.53884801.88GPS 2350H-5CB522310.10001569481.37784824.54GPS 2351H-5CB522307.02521569556.18144821.38GPS 2352H-5CB522478.06171569792.55944822.28GPS 31692353K-4CS1992RDCB526042.23741563785.46024783.044766.56Plans4779.313.73Plans4779.31 31702354K-4CS1992RDCB526024.81501563838.34994783.384767.67Plans4779.653.73Plans4779.65 31712355K-4CS1992RDCB527530.83401563509.02044764.294745.62Plans4760.403.89Plans4760.40 31722356K-4CS1992RDCB527531.52011563473.24324764.294745.92Plans4760.403.89Plans4760.40 31732357K-4CS1992RDCB526800.60001563427.23064772.054750.97Plans4768.044.01Plans4768.04 31742358K-4CS1992RDCB526778.19011563483.51154772.484752.06Plans4768.324.16Plans4768.32 31752359K-4CS1992RDCB526029.52001563421.87834781.644766.58Plans4777.823.82Plans4777.82 31762360K-4CS1992RDCB526027.18781563457.93154781.654766.15Plans4778.623.03Plans4778.62 31772361K-4BPE1990RDCB526059.38981563147.71724766.60GPS 31782362K-4BPE1990RDCB526056.42661563216.67714766.97GPS 31792363K-4BPE1990RDCB526792.05691563188.22594759.03GPS 31802364K-4BPE1990RDCB526805.80041563241.61084759.18GPS 31812365K-4BPE1990RDCB527544.71061563213.22244749.88GPS Page 8 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 31822366K-4BPE1990RDCB527544.01471563249.51214750.32GPS 2367K-4SID 625DCB527557.95251562693.85174760.164747.67Plans4757.662.50Plans4757.66 2368K-4SID 625DCB527557.26631562729.62874760.164747.46Plans4757.662.50Plans4757.66 2369K-4SID 625DCB526820.77291562717.55554771.084755.64Plans4767.863.22Plans4767.86 2370K-4SID 625DCB526821.98011562654.61244770.844755.14Plans4767.613.23Plans4767.61 2371K-4SID 625DCB526069.74311562693.41014778.984763.01Plans4775.753.23Plans4775.75 2372K-4SID 625DCB526070.97191562629.33934778.804762.78Plans4775.573.23Plans4775.57 31892373K-4BPE1990RDCB526047.17911562928.84444765.10GPS 31902374K-4BPE1990RDCB526051.15351562892.72024765.33GPS 2375K-4SID 625DCB525351.52091562669.68864788.584773.84Plans4785.353.23Plans4785.35 2376K-4SID 625DCB525351.12131562604.97134788.424773.45Plans4785.193.23Plans4785.19 2377K-4SID 625DCB525360.65221562364.67204787.324771.55Plans4784.103.22Plans4784.10 2378K-4SID 625DCB526079.50351562355.58944777.784762.19Plans4774.653.13Plans4774.65 2379K-4SID 625DCB526078.28061562419.35274777.764761.65Plans4774.523.24Plans4774.52 2380K-4SID 625DCB526828.86951562380.93384769.954754.72Plans4767.852.10Plans4767.85 2381K-4SID 625DCB526826.00441562444.76804769.954755.25Plans4767.702.25Plans4767.70 2382K-4SID 625DCB527564.81631562421.50594761.744741.42Plans4759.242.50Plans4759.24 2383K-4SID 625DCB527564.14981562456.25794761.744741.43Plans4759.242.50Plans4759.24 2384K-4SID 625DCB527571.84141562140.75414744.43GPS 2385K-4SID 625DCB527572.80141562176.25524760.814744.72Plans4758.312.50Plans4758.31 2386K-4SID 625DCB524916.99031562654.79204794.364778.66Plans4791.133.23Plans4791.13 2387K-4SID 625DCB524971.36111562643.11844794.174778.97Plans4791.302.87Plans4791.30 2388J-5CB524867.28621563963.21074785.39GPS 2389J-5CB524864.98351563997.72634785.80GPS 32062390K-5NP1996RDCB522972.68201563678.29464826.174812.88Plans4821.404.77Plans4821.40 32072391K-5NP1996RDCB522936.61101563676.88504826.174813.07Plans4822.144.03Plans4822.14 32082392K-5NP1996RDCB522984.84831563214.99614824.084810.33Plans4820.743.34Plans4820.74 32092393K-5NP1996RDCB522947.14491563213.14504824.544810.44Plans4821.463.08Plans4821.46 32102394K-5NP1996RDCB522957.51861562843.33894824.084810.42Plans4820.133.95Plans4820.13 32112395K-5NP1996RDCB523165.63541562857.27774817.844804.44Plans4814.263.58Plans4814.26 32122396K-5NP1996RDCB523299.15161562825.48364816.554802.63Plans4813.513.04Plans4813.51 32132397K-5NP1996RDCB523370.17691562886.53044816.074801.01Plans4813.452.62Plans4813.45 32142398K-5NP1996RDCB523334.12361562884.19824816.074800.84Plans4813.092.98Plans4813.09 1PA2399K-5NP1996RDCB523321.40601563290.67254818.304802.72Plans4815.722.58Plans4815.72 32162400K-5VCS1995RDCB524070.47551563074.91284807.364792.06Plans4804.163.20Plans4804.16 32172401K-5VCS1995RDCB524093.97391563132.99724806.934791.99Plans4803.733.20Plans4803.73 32182402K-5VCS1995RDCB524092.60361563204.44914807.184792.69Plans4803.983.20Plans4803.98 32192403K-5VCS1995RDCB524128.46031563217.03264807.224792.58Plans4804.023.20Plans4804.02 32202404K-5VCS1995RDCB524075.19051562914.61324806.184791.20Plans4802.983.20Plans4802.98 32212405K-5VCS1995RDCB524109.77661562907.89284806.184791.19Plans4802.983.20Plans4802.98 32222406K-5VCS1995RDCB524043.66411562847.35034806.744792.32Plans4803.543.20Plans4803.54 2407K-5SID 625DCB524064.31271562626.23594807.984794.33Plans4804.753.23Plans4804.75 2408K-5SID 625DCB524100.38961562627.33794807.984795.20Plans4804.753.23Plans4804.75 2409K-5SID 625DCB524065.52971562562.78004807.924794.00Plans4804.693.23Plans4804.69 2410K4/5SID 625DCB524926.19621562345.87974793.264776.67Plans4790.602.66Plans4790.60 2411K4/5SID 625DCB524967.59671562326.06104793.204775.02Plans4790.502.70Plans4790.50 2412K4/5SID 625DCB524929.03771562283.27554793.304774.12Plans4790.702.60Plans4790.70 2413K-5SID 625DCB524073.49121562318.75854806.724786.32Plans4803.493.23Plans4803.49 2414K-5SID 625DCB524074.70821562255.30264806.564786.22Plans4803.333.23Plans4803.33 2415K-5SID 625DCB524081.11411562006.84154805.364788.96Plans4802.133.23Plans4802.13 2416K-5SID 625DCB524083.96351561943.82724805.204789.60Plans4802.103.10Plans4802.10 2417K4/5SID 625DCB524933.78371562035.80834794.784779.01Plans4791.553.23Plans4791.55 2418K4/5SID 625DCB524941.35951561726.35204792.144777.97Plans4788.913.23Plans4788.91 2419K4/5SID 625DCB524951.75141561355.62414790.364773.21Plans4787.143.22Plans4787.14 2420K4/5SID 625DCB524991.12441561355.96914790.284772.52Plans4787.053.23Plans4787.05 2421K-5SID 625DPL524136.70451561332.71094783.60GPS4798.50-14.90Plans4798.50 2422K-5SID 625DPL524102.26401561331.84534783.36GPS4798.50-15.14Plans4798.50 2423K-5SID 625DCB523631.63811561316.76854786.57GPS 2424K-5SID 625DCB523597.20341561315.59524786.61GPS 32412425K-5VCBP1996RDCB522998.67191561296.42444816.504798.09Plans4813.073.43Plans4813.07 32422426K-5SID 625DCB523033.51021561362.11024816.604798.06Plans4813.373.23Plans4813.37 32432427K-5VCBP1996RDCB522729.08651561322.01944821.004804.00Plans4818.202.80Plans4818.20 32442428K-5VCBP1996RDCB522758.61821561322.17564821.094803.73Plans4818.662.43Plans4818.66 32452429K-5VCBP1996RDCB522771.03851561786.76604821.184801.07Plans4818.562.62Plans4818.56 32462430K-5VCBP1996RDCB522742.98761561794.94484821.094799.91Plans4818.782.31Plans4818.78 32472431K-5VCBP1996RDCB522711.69831562228.64964825.564801.69Plans4722.16103.40Plans4722.16 32482432K-5VCBP1996RDCB522737.70391562241.55704825.064801.73Plans4822.162.90Plans4822.16 7VCB2433K-5VCBP1996RDMH522757.91781562299.78364825.744807.12Plans4821.044.70Plans4821.04 6VCB2434K-5VCBP1996RDMH522892.38421562304.00334824.244804.33Plans4820.244.00Plans4820.24 32512435K-5MU1994RDCB522699.49151562608.47054825.054805.66Plans 32522436K-5MU1994RDCB522704.13221562794.28004825.824807.57Plans 32532437K-5MU1994RDCB522730.57251562527.84604807.68GPS 32542438K-5MU1994RDCB522914.41251562524.29574802.55GPS 32552439K-5SID 625DCB522964.08951562586.26644822.584803.17Plans4819.353.23Plans4819.35 32562440K-5SID 625DCB523000.15661562587.88114822.584801.77Plans4819.353.23Plans4819.35 32572441K-5NP1996RDCB522909.67491563113.56714825.204815.48Plans4821.253.95Plans4821.25 32582442K-5NP1996RDCB522920.20041563078.08104825.134816.77Plans4822.552.58Plans4822.55 32592443K-5NP1996RDCB522676.58371563717.43124830.924822.00Plans4825.974.95Plans4825.97 32602444K-5NP1996RDCB522640.51471563715.91924830.924822.55Plans4826.014.91Plans4826.01 2445G-8RDCB515294.08461573153.61264916.79GPS 2446G-8RDCB515276.74301573202.30024916.48GPS 2447G-8RDCB516151.57481573359.56394903.16GPS 2448G-8RDCB516440.10521573544.14974898.22GPS 2449G-8RDCB516410.24901573560.90874898.35GPS 2450G-8CB516464.68831574230.59134899.15GPS 2451G-8SID 553DCB516428.18081574251.94034913.544899.06Plans4910.013.53Plans4910.01 2452G-8SID 553DCB516414.38541574201.22034914.074900.62Plans4910.543.53Plans4910.54 2453G-8SID 553DCB516153.87371574181.35744917.194903.55Plans4913.663.53Plans4913.66 2454G-8CB515917.28171574197.64114906.42GPS 2455G-8SID 553DCB515878.32481574175.56374918.764908.47Plans4915.233.53Plans4915.23 2456G-8SID 553DCB515283.37051574226.30784929.554915.76Plans4926.023.53Plans4926.02 2457G-8SID 553DCB515282.96021574162.10234929.514915.49Plans4925.983.53Plans4925.98 2458G-8SID 553DCB515319.04921574162.58894929.304915.90Plans4925.773.53Plans4925.77 2459G-8SID 553DCB514626.90061574147.78544940.404924.27Plans4936.873.53Plans4936.87 2460G-8CB514627.32861574211.06844923.15GPS 2461G-8SID 553DCB514958.20601574155.26314933.104916.07Plans4929.573.53Plans4929.57 2462G-8CB514390.18191572544.04894932.19GPS 2463G-8CB514385.58211572784.03554932.80GPS 2464G-8CB514391.76961572461.21714933.42GPS 32812465E-5SID 1901920DCB524651.67461577522.27684776.06GPS 32822466E-5SID 1901920DCB524608.83451577531.60854778.57GPS 32832467E-5SID 1901920DCB524593.36151577482.80534776.63GPS 32922468E-5SID 1901920DCB524267.36721577455.22814780.80GPS 32932469E-5SID 1901920DCB524268.63421577474.73714780.16GPS 32842470E-5SID 1901920DCB524286.04021577508.29724781.78GPS 32852471E-5SID 1901920DCB524285.72001577525.00694782.56GPS 32862472E-5SID 1901920DCB524251.37761577519.01614781.61GPS 32872473E-5SID 1901920DCB524254.85641577508.72514783.68GPS 32882474E-5SID 1901920DCB524231.93861577505.92744780.68GPS 32892475E-5SID 1901920DCB524216.08841577476.80674778.68GPS 32902476E-5SID 1901920DCB524232.52791577475.17334781.31GPS 32912477E-5CB524232.91881577454.77314785.36GPS 32942478E-5SID 1901920DCB523925.21631577500.15264788.26GPS 32952479E-5SID 1901920DCB523926.51081577518.22644785.94GPS 32962480E-5SID 1901920DCB523898.63491577517.28214785.13GPS 32972481E-5SID 1901920DCB523892.43351577498.39644791.20GPS 32982482E-5SID 1901920DCB523872.79611577495.66144795.07GPS 32992483E-5SID 1901920DCB523881.52561577468.24254790.59GPS 2484E-5CB523012.13791577284.11734800.70GPS 2485E-5CB523040.05301577283.01144799.72GPS 2486E-5CB524606.30851577920.33114779.80GPS 2487E-5CB524613.57461577969.28474781.21GPS 2489I-3CB528692.80041568030.19934733.62GPS 33062490I-3BS, Ph 21995RDCB529959.58231568796.43874735.094714.68Plans4731.853.24Plans4731.85 33072491I-3BS, Ph 21995RDCB529923.50961568795.13194735.094714.99Plans4732.592.50Plans4732.59 33082492I-3BS, Ph 21995RDCB529630.75281568660.10064741.374722.73Plans4738.133.24Plans4738.13 33092493I-3BS, Ph 21995RDCB529601.56321568642.10744741.374722.56Plans4738.872.50Plans4738.87 33102494I-3AS, Ph 11985RDCB529916.68921568209.43784734.454716.70Plans4731.522.93Plans4731.52 33112495I-3AS, Ph 11985RDCB529982.29741568210.69564734.194716.11Plans4730.893.30Plans4730.89 2496I-3CB530175.38061568152.86704717.15GPS 2497I-3CB530134.37741568151.97844716.28GPS 2498I-3CB530148.01881568039.53704718.33GPS 2499I-3CB530137.43701567478.89584712.49GPS 33162500D-7HBR1996RDCB517911.18991579491.02105015.405000.71Plans5013.002.40Plans5013.00 33172501D-7HBR1996RDCB517875.09121579491.04735015.905001.10Plans5013.502.40Plans5013.50 2502E-7CB517613.75871578315.10314956.62GPS 2503E-7CB516910.56841578362.85314906.70GPS 2504E-7CB517228.60401578549.02804957.72GPS 2505E-7CB517220.99211578518.11654958.35GPS 2506E-7CB518367.03511579335.67194996.54GPS 2507E-7CB518358.16621579370.36954996.10GPS 2508F-3CB527637.01611576886.34004744.17GPS 2509F-3CB527638.22031576823.49954744.77GPS 2510F-3CB527641.85251576548.32304751.50GPS 2511F-3CB527641.37531576487.60384744.10GPS 2512F-3CB527641.17531576155.54064744.10GPS 2513F-3CB527642.37951576092.70014740.48GPS 2514F-3CB527644.70381575800.16754741.52GPS 2515F-3CB527642.65511575735.82884741.14GPS 2516F-3CB527678.71031575738.05804740.43GPS 2517F-3CB527646.71791575438.20194741.44GPS 2518F-3CB527647.92611575375.15644741.95GPS 2519F-3CB527649.55731575033.18094745.64GPS 2520F-3CB528008.64721575046.11314743.23GPS 2521F-3CB528371.03111575058.39064735.87GPS 2522F-3CB528405.47351575059.15314734.78GPS 2523F-3CB528369.82881575121.12854735.11GPS 2524F-3SID 424CB528364.60061575650.80504736.03GPS 2525F-3SID 424CB528400.68521575651.49664735.75GPS 2526F-3SID 424CB528364.11711575761.65304737.07GPS 2527F-3SID 424CB528364.53351575825.55004735.72GPS 2528F-3CB528003.80941575812.27924738.96GPS 2529F-3CB528001.91331576168.09384738.30GPS 2530F-3CB528000.48881576499.30524740.36GPS 2531F-3CB527999.30221576561.22314740.77GPS 2532F-3CB527995.65821576837.01474743.73GPS 2533F-3CB527996.11001576899.06654742.87GPS 2534F-3CB528362.20731576118.18514735.60GPS 2535F-3CB528398.29581576118.67154735.12GPS 2536F-3CB528359.60411576510.90424736.03GPS 2537F-3CB528356.72231576575.66094736.99GPS 2538F-3SID 424CB528355.12121576916.09854734.32GPS 2539F-3SID 424CB528391.21751576916.17494734.35GPS 2540J-4CB526179.35281565961.86124768.15GPS 2541J-4CB526162.25291565997.93884768.05GPS 33582542J-4WS1996RDCB526136.94281565520.89954787.964769.40Plans4784.133.83Plans4784.13 33592543J-4WS1996RDCB526134.62441565556.23514787.964769.55Plans4784.503.46Plans4784.50 2544J-4CB527490.65331565347.70284755.25GPS 2545J-4CB527461.86701565736.53614751.98GPS Page 9 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 2546J-4CB527461.17501565772.62084752.25GPS 2547J-4CB527483.08241565828.11064751.06GPS 2548J-4CB527472.45671566039.98184749.57GPS 2549J-4CB527471.76681566075.96394749.79GPS 2550J-4CB527094.25291566596.04174756.79GPS 2551J-4CB527091.65851566560.20174756.53GPS 2552J-4CB525520.88621567186.00054779.04GPS 2553J-4CB525521.58011567149.81334779.22GPS 2554J-4CB525304.18761567534.10854780.19GPS 2555J-4CB525295.01261567499.16784780.44GPS 2556J-4CB525292.35421567381.08064781.59GPS 2557J-4CB526120.90931567555.20234769.21GPS 2558J-4CB526118.58311567590.94794769.29GPS 2559J-4CB526191.68711567629.16534767.84GPS 2560J-4CB526227.76781567630.06214767.72GPS 2561J-4CB527478.58881567431.71324750.47GPS 2562J-4CB526188.72481568810.70014767.16GPS 2563J-4CB526240.06661568785.84154765.36GPS 2564J-4CB526240.76231568749.55184766.52GPS 2565J-4CB526181.32711569025.40244768.33GPS 2566J-4CB526178.38391569093.33724768.82GPS 2567F-6CB519385.50851574822.40174864.59GPS 2568F-7CB518357.85281575961.43974858.15GPS 2569F-7CB518323.49251575956.37164857.65GPS 2570F-7CB518244.69821576386.29714858.20GPS 2571F-7CB518271.88631576765.64434859.83GPS 2572F-7CB518280.76121576816.26994859.58GPS 2573F-7CB518278.96201576567.65004859.89GPS 2574F-7CB518315.06271576567.52134860.30GPS 2575F-7CB518581.90871576770.55974855.16GPS 2576F-7CB518619.64171576770.87254855.10GPS 2577F-7CB518900.82551576825.07524851.60GPS 2578F-7CB518893.58491576774.78874853.04GPS 2579F-7CB519310.64201576845.43964850.44GPS 2580F-7CB519318.14191576796.56364847.72GPS 2581F-7CB518901.50361576361.55454850.42GPS 2582F-7CB518937.59251576362.04094850.52GPS 2583F-7CB519133.45771575816.63004847.35GPS 2584F-7CB519097.33351575817.98874847.32GPS 2585F-7CB519103.05801575604.89344846.98GPS 2586F-7CB519140.46881575622.01854844.37GPS 34032587F-7SID 434DCB517890.77811575418.39914869.99GPS 34042588F-7SID 434DCB517890.95471575494.80364869.45GPS 34052589F-7SID 434DCB517854.00351575453.69014868.54GPS 2590F-7SID 4631966DCB517759.01041575187.69604871.03GPS 2591F-7SID 4631966DCB517777.80541575148.77894871.29GPS 2592F-7SID 4631966DCB517413.45231574639.70234874.78GPS 2593F-7SID 4631966DCB517419.06651574603.60904876.11GPS 2594F-7SID 4631966DCB517256.78811574595.06374880.00GPS 2595F-7SID 4631966DCB517495.94711575300.99954881.08GPS 2596F-7SID 4631966DCB517534.65841575335.89124880.69GPS 2597F-8CB516207.01381575346.95684904.65GPS 2598F-8CB514847.64131574530.53614929.60GPS 2599F-8CB514759.11391574526.48084929.71GPS 2600F-8CB514255.44781575464.61604911.04GPS 2601F-8CB514296.46151575464.99184910.65GPS 2602F-8CB514383.33301575469.83584908.34GPS 2603F-8CB515353.78821575860.28734899.46GPS 2604F-10CB509047.72041576133.85984973.22GPS 2605F-10CB509005.21161576125.86644973.61GPS 2606F-10CB510093.18571575949.71164965.08GPS 2607F-10CB510080.92411575990.19004965.13GPS 2608F-10CB510382.22361576022.31994961.65GPS 2609F-10CB511198.31091575991.60494947.61GPS 2610F-10CB511155.51341575998.68144947.38GPS 2611F-10CB510148.30341575128.50004966.26GPS 2612F-10CB510069.12001576178.04554963.68GPS 2613F-10CB509960.67531576357.07564964.98GPS 2614F-10CB509946.79501576396.39494965.27GPS 2615H-3CB528982.45631569354.0405 2616H-3CB528977.68041569431.9899 34332617J-0CCS, Ph 12002RDCB537024.99761566564.83704656.65Plans4652.174.48Plans4652.17 34342618J-0CCS, Ph 12002RDCB537024.27041566602.76644656.64Plans4652.933.71Plans4652.93 14CCP12619J-0CCS, Ph 12002RDMH537067.72511566561.34914656.04Plans4651.634.41Plans4651.63 13CCP12620J-0CCS, Ph 12002RDMH537073.13621566279.13344654.50Plans4650.324.18Plans4650.32 34372621J-0CCS, Ph 12002RDCB537051.81791565936.20884653.46Plans4650.363.10Plans4650.36 34382622J-0CCS, Ph 12002RDCB537051.16141565970.44784653.44Plans4650.153.29Plans4650.15 34392623J-0CCS, Ph 12002RDCB537072.02981565994.53684653.33Plans4649.673.66Plans4649.67 12CCP12624J-0CCS, Ph 12002RDMH537081.84741565995.95574653.00Plans4649.353.65Plans4649.35 34412625J-0CCS, Ph 12002RDCB537108.11801565995.02374653.30Plans4650.382.92Plans4650.38 34422626J-0CCS, Ph 12002RDCB537115.86721565676.44784651.99Plans4647.594.40Plans4647.59 11CCP12627J-0CCS, Ph 12002RDMH537088.01931565674.06804651.80Plans4647.843.96Plans4647.84 34442628J-0CCS, Ph 12002RDCB537081.44671565674.55724651.74Plans4648.083.66Plans4648.08 15CCP12629J-0CCS, Ph 12002RDMH536575.67851565952.30654659.00Plans4655.843.16Plans4655.84 16CCP12630J-0CCS, Ph 12002RDMH536306.74771565943.97104662.18Plans4657.194.99Plans4657.19 34472631J-0CCS, Ph 12002RDCB536137.37431566048.91344664.74Plans4659.315.43Plans4659.31 34482632J-0CCS, Ph 12002RDCB536119.90801566018.53144664.74Plans4660.054.69Plans4660.05 34492633J-0CCS, Ph 12002RDCB536132.25231565973.74874664.21Plans4658.815.40Plans4658.81 34502634J-0CCS, Ph 12002RDCB536167.07771565954.52184664.21Plans4660.204.01Plans4660.20 17CCP12635J-0CCS, Ph 12002RDMH536169.04311566023.16534664.20Plans4658.955.25Plans4658.95 34512636J-0CCS, Ph 12002RDCB536181.42561566061.96154664.22Plans4659.924.30Plans4659.92 34532637J-0CCS, Ph 12002RDCB535941.85561565549.23364667.49Plans4662.375.12Plans4662.37 34542638J-0CCS, Ph 12002RDCB535907.04791565567.53794667.49Plans4662.764.73Plans4662.76 2639J-0CB537136.99861565258.9630 2640J-0CB537076.78611565318.6204 2641J-0CB537079.55651565259.7075 2642J-0CB537141.03751564791.6189 2643J-0CB537108.21601564791.9125 2644J-0CB536285.64341565162.0344 2645J-0CB536259.40421565161.3262 2646J-0CB536270.39611565187.0718 2647J-0CB537042.17751564984.2601 2648J-0CB537042.71221564956.3768 2649J-3CB530143.35161565801.1810 2650L-3,K-3CB528182.54531561439.5341 2651I-3CB528427.29701569041.1811 2652I-3CB528430.00951569070.8702 34692653I-3BS, Ph 21995RDCB528750.17221569060.18964750.49Plans4747.992.50Plans4747.99 34702654I-3BS, Ph 21995RDCB528779.96711569046.60884750.49Plans4747.253.24Plans4747.25 2655I-3CB529956.32271568880.8778 2656I-3CB529921.84691568881.8577 2657K-4CB527567.28691561864.9079 2658K-4CB527568.27431561898.9736 2659K-4CB527572.67591561583.9196 2660K-4CB527572.03301561617.4414 34772661L-4VWS, Ph 12002RDCB525019.02471560329.0453 34782662L-4VWS, Ph 12002RDCB524981.31951560327.2966 34792663L-4VWS, Ph 12002RDCB525007.04141560697.1788 34802664L-4VWS, Ph 12002RDCB524970.94681560696.9993 2665L-5CB525065.25401558688.8079 2666L-5CB525027.53701558687.6742 4832667L-4VWS, Ph 12002RDCB525035.23741559654.8781 4842668L-4VWS, Ph 12002RDCB524999.16851559653.3658 2669I-7CB518932.71701568312.6624 2670G-9WDS, Ph 32001RDCB511841.11111573530.0482 2671G-9WDS, Ph 32001RDCB511810.41221573505.1549 2672G-9WDS, Ph 32001RDCB511794.09981573585.7562 34892673F-9WMS, Ph 12002RDCB512291.95271576375.8036 34902674F-9WM,S Ph 12002RDCB512267.70071576356.9819 2675I-2CB531441.99391568671.0325 2676I-2CB531409.21341568669.1735 2677I-2CB531417.97421568468.9582 2678I-2CB531452.34771568473.3090 2679I-2CB531560.21001568495.7843 2680L-1,K1CB533137.88911562289.4440 2681L-1,K1CB533139.52871562203.9487 2682L-1,K1CB533200.33081561685.8010 2683L-1,K1CB533172.41991561686.7014 2684L-1,K1CB533125.68381561642.5288 2685L-1,K1CB533126.56261561596.7058 2686L-1,K1CB532933.26991561751.0285 2687L-1,K1CB532882.47871561747.1830 2688L-1,K1CB533207.74831561555.7045 2689L-1,K1CB533176.62581561552.9541 2690L-1,K1CB533175.00331561552.0000 2691L-1,K1CB533525.13681561604.0423 2692L-1,K1CB533525.89221561650.2043 2693L-1,K1CB533572.62631561694.4793 2694L-1,K1CB533602.14601561695.2505 2695L-1,K1CB533607.41901561420.3124 2696L-1,K1CB533576.26111561419.4072 2697L-1,K1CB533541.45471561352.0820 2698L-1,K1CB533542.53461561381.3296 2699L-1,K1CB533139.02021561374.9237 2700L-1,K1CB533579.70961561239.6004 2701L-1,K1CB533609.24101561239.7566 2702L-1,K1CB533647.41601560874.7952 2703L-1,K1CB533616.36231560868.4569 2704L-1,K1CB533828.94901560905.8630 2705L-1,K1CB533856.85401560905.2700 2706L-1,K1CB534221.96871560860.5876 2707L-1,K1CB534249.88351560859.4822 2708L-1,K1CB534452.52231560816.7085 2709L-1,K1CB534480.13041560831.5950 2710L-1,K1CB533566.05701562208.1292 2711L-1,K1CB533538.11461562210.6699 2712L-1,K1CB533536.54381562292.5773 2713L-1,K1CB533560.00771562523.5599 2714L-1,K1CB533589.53121562524.1261 35312715G-3EAI2002RDCB531673.61061572252.3247 4712.524712.52 35322716G-3EAI2002RDCB531656.50321572288.8124 4712.934712.93 35332717G-3EAI2002RDCB531233.02491572211.0638 4716.794716.79 35342718G-3EAI2002RDCB531233.91261572250.3575 4717.204717.20 2719G-9CB513754.88541572816.1471 2720G-9CB513756.34331572740.0813 2721G-9CB513760.63861572515.9842 2722G-9CB513762.08871572440.3284 2723G-9CB513132.26201572427.0257 2724G-9CB512499.11701572415.6079 Page 10 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 2725M-4CB528880.62401556268.8872 2726M-4CB528876.77331556213.0258 2727M-4CB529574.78511555665.0554 2728M-4CB529575.81951555696.6608 2729M-4CB529102.64691554873.7415 2730M-4CB529058.38691554871.5592 2731M-4CB529005.64751555995.5271 2732M-4CB528961.36981555994.2675 2733M-4CB528277.97911554924.8848 2734M-4CB528246.81711554924.1844 2735H-1CB533479.85071569955.9817 2736H-1CB533507.34101569977.0187 2737M-4CB527779.73741555066.4851 2738L-5SC2001RDCB523689.01561559865.1288 2739L-5SC2001RDCB523723.45231559866.1995 2740L-5SC2001RDCB523752.68811558940.8257 2741L-5SC2001RDCB523718.26121558939.2423 2742L-5SC2001RDCB524561.71941559705.0700 2743L-5SC2001RDCB524562.38011559670.6255 3562744L-4VWS, Ph 12002RDCB524981.55111559716.4045 3552745L-4VWS, Ph 12002RDCB524983.85991559681.5814 2746D-5CB522068.97501582063.9098 2747D-5CB522212.28641581949.0287 2748D-5CB522253.99971582084.1700 2749D-5CB522261.09021582313.6107 2750D-5CB522298.90951582309.4127 2751D-5CB522161.29661581184.6598 2752D-5CB522124.01121581075.3436 2753D-5CB522103.46401581034.4422 2754D-5CB522111.05441581066.4811 2755D-5CB522058.10691581346.4574 2756D-5CB522124.74241581208.4693 2757D-5CB522095.79661581349.0254 2758D-5CB522103.77461581532.1298 2759D-5CB522206.59471581732.2288 2760D-5CB522029.49391582069.2040 2761G-10MH509407.63841573107.34704996.66GPS 2762E-4MH527270.53241578029.93714753.99GPS 2763E-4MH527298.92651577575.66854750.34GPS 2764E-3MH527650.90391578045.42944742.80GPS 2765E-3MH528008.36741578057.61154736.94GPS 2766E-3MH528369.08761578071.08654734.02GPS 2767E-3MH528366.68351578367.82204728.31GPS 6362768F-5/6SID 551912DMH524648.87381575356.54954788.67GPS 6372769F-5/6SID 551912DMH524279.94131575343.42884788.33GPS4796.10-7.77Plans4796.10 21S552770F-5/6SID 551912D524240.41311575351.18314788.40GPS 22S552771F-5/6SID 551912D524241.23621575308.22994789.04GPS 23S552772F-5/6SID 551912D524257.64821575308.03174788.57GPS 24S552773F-5/6SID 551912D524259.71671575285.71524788.15GPS 6422774F-5/6SID 551912DMH523927.40301575331.03254796.65GPS4800.45-3.80Plans4800.45 6432775F-5/6SID 551912DMH523553.55151575317.71494802.27GPS4803.00-0.73Plans4803.00 6442776F-5/6SID 551912DMH523194.40481575307.65324802.82GPS4809.00-6.18Plans4809.00 6452777F-5/6SID 551912DMH522833.62761575297.04754814.65GPS4818.20-3.55Plans4818.20 6462778F-5/6SID 551912DMH522477.80831575284.58824825.36GPS4834.00-8.64Plans4834.00 6472779F-5/6SID 551912DMH522071.18721575268.79674830.12GPS4839.00-8.88Plans4839.00 6482780F-5/6SID 551912DMH521682.49641575259.19424836.38GPS4844.65-8.27Plans4844.65 6492781F/G-6SID 2271921DMH521326.39171575261.59954841.55GPS 6502782F/G-6SID 2271921DMH520959.21001575242.66674849.16GPS4851.56-2.40Plans4851.56 6512783F-6SID 3201938DMH520596.72501575235.51504851.10GPS 2784F-6MH520240.86941575224.90094849.60GPS 2785F-6MH519883.33221575216.40824856.98GPS 6542786F-6SID 428DMH519528.92201575215.97454857.88GPS 6552787F-6SID 428DMH519415.87431575207.14224862.28GPS 2788F-7MH518211.98531574754.07104871.24GPS 2789E-4MH524907.67511579832.73454792.59GPS 2790E-4MH524945.17521579502.62354791.35GPS 2791E-4MH524949.45091579193.82164788.02GPS 2792E-4MH524965.04701578808.01594770.97GPS 2793E-4MH524972.96511578737.30484767.85GPS 2794E-4MH524977.24911578599.35324766.52GPS 2795E-4MH524986.05301578396.77854768.56GPS 2796E-4524953.69821577944.52374770.91GPS 2797E-4525176.86351577943.77494772.31GPS 2798E-4MH525190.39761577494.34804774.00GPS 2799F-4MH525194.54441577021.05204773.52GPS 2800F-4MH525210.53791577042.68914771.17GPS 2801F-4MH525198.44551577074.35084771.04GPS 2802E-4MH525201.96551577233.16714769.14GPS 2803F-4MH524985.88091574980.69764775.06GPS 2804F-4MH524955.59591575362.32504778.34GPS 2805F-4MH524967.80681576095.08114775.41GPS 2806G-1MH533274.99251574565.98944678.19GPS 2807G-1MH533275.50561574453.60444677.46GPS 2808G-1MH533218.49801574260.43544678.28GPS 2809G-1MH533754.58071574027.56334698.87GPS 2810F-3MH529425.10191577249.58594719.45GPS 2811F-3SID 424MH528373.28511577252.60764732.96GPS 6802812E/F-4SID 1151916DMH527265.93571577156.62924746.99GPS4759.00-12.01Plans4759.00 2813G-2MH530491.24891574186.93944713.73GPS 2814G-2MH530470.72561574230.43764714.09GPS 2815G-2MH530496.28971574095.15094712.25GPS 2816G-2MH530360.69801574320.93204709.47GPS 2817G-2MH530291.86251574316.84394710.62GPS 6862818G-2WAL1993DCO530426.24791574753.31034722.804704.20Plans4720.192.61Plans4720.19 6872819G-2WAL1993DMH530500.30071574742.01324724.204709.68Plans4719.894.31Plans4719.89 6882820G-2WAL1993DMH530925.04081574753.94754760.004707.43Plans4717.5842.42Plans4717.58 2821G-2MH530929.28781574104.26984707.77GPS 2822G-3MH529123.96131574298.35804718.96GPS 2823G-3MH529132.10401574130.33104718.90GPS 2824G-3MH528422.32651574094.16684719.88GPS 2825G-3MH527417.60811574379.28184744.13GPS 2826G-3MH529474.92121573108.83214730.63GPS 2827G-3MH529649.45111573077.31014727.73GPS 2828G-3MH529732.49681573024.85764731.64GPS 2829G-3MH529922.85431574136.56414717.21GPS 2830G-3MH529976.93981574139.75424716.12GPS 2831G-3MH529968.56921574319.67254715.60GPS 2832J-0MH537809.25801567337.10024634.79GPS 2833J-0MH537191.94121567870.31634631.56GPS 2834I-1MH532915.98981567786.28664683.74GPS 7032835H-3BSD1994RDMH528559.78031569747.93614737.78GPS4766.61-28.83Plans4766.61 2836H-3MH527923.61761569466.54524750.90GPS 2837F-9MH513422.18241574936.29594942.54GPS 2838F-9MH513064.79991574833.97074943.12GPS 2839J-3MH530178.37071565857.43474724.53GPS 2840J-3MH530185.94231565462.55564721.29GPS 7092841J-3HCS, Ph 11999RDMH527561.23831566030.71124768.504750.03Plans4763.604.90Plans4763.60 7102842J-3HCS, Ph 11999RDMH527635.85641566246.67814767.544750.17Plans4760.047.50Plans4760.04 2843J-3MH529459.51301565695.87594725.76GPS 2844J-34MH529468.10911565675.42814725.02GPS 2845G-4MH525011.86591574652.21204781.95GPS 7142846G-4/5SID 981915DMH525022.12971574031.05204787.36GPS4799.30-11.94Plans4799.30 7152847G-4/5SID 981915DMH525036.98241573427.31094788.01GPS4795.87-7.86Plans4795.87 7162848G-4/5SID 981915DMH525038.61321573342.22494785.63GPS4794.56-8.93Plans4794.56 7172849G-4/5SID 981915DMH525043.31891573096.70534780.08GPS4790.62-10.54Plans4790.62 7182850G-4/5SID 981915DMH525046.65281573008.37024778.36GPS4789.25-10.89Plans4789.25 2851G-4MH525050.53331572805.90644775.35GPS 2852G-4MH525045.84941572622.25024775.62GPS 2853G-4MH525054.88701572664.36684775.43GPS 2854G-4MH525090.15241572707.80654773.78GPS 2855G-4MH525090.47221572776.72694773.10GPS 2856G-4MH525099.22541572748.07784773.16GPS 2857G-4MH525051.02141572266.80504779.62GPS 2858G-4MH525048.26121572325.20614779.08GPS 2859G-4MH525058.44441572307.55744779.53GPS 2860H-4MH525042.81201572010.26994779.73GPS 2861H-4MH525142.26831570245.73484783.78GPS 2862H-4MH525155.43721571613.09504780.25GPS 2863H-4MH525149.27121571934.78204776.64GPS 2864H-4MH525447.20201572399.20324768.42GPS 2865H-4MH525445.21421572759.73444767.83GPS 7342866F/G-4SID 408DMH525414.98721574679.31984772.85GPS 7352867F-4MH525217.65671574701.89364774.57GPS 7362868G-7SID 447RDMH518582.78951574412.80894876.48GPS 7372869G-7SID 447RDMH518257.49821574434.05864875.21GPS 7382870F-8C&SC1974RDMH515617.79441574413.51654932.304914.00Plans4926.006.30Plans4926.00 7412871H-4MH525420.82361569324.21874777.94GPS 2872H-4MH525913.99501569361.46444771.42GPS 2873H-4MH527218.62831569437.34014756.83GPS 2874H-7MH519336.23161571400.74354864.38GPS 2875H-7MH519513.00441571423.51414866.13GPS 2876H-7SID 538DMH519535.63191571099.06424861.60GPS 2877H-7MH519505.71431571803.84114868.36GPS 2878H-7MH519482.20681571831.79734868.82GPS 2879G-5MH522056.78511571910.88624821.56GPS 2880G-5MH522344.61921571874.87004813.80GPS 2881G-5MH522368.73911571900.56014813.20GPS 2882G-5MH522557.31711571906.63594817.34GPS 2883G-5MH522896.64971571923.19014812.30GPS 2884G-5MH523255.64901571940.94184806.23GPS 2885G-5MH523613.05131571956.40664800.43GPS 2886G-5MH523973.70631571973.36954797.22GPS 2887G-5MH524023.05811571966.72684794.99GPS 2888G-5MH524311.70271571974.00274794.20GPS 2889G-4MH526442.88451573441.74544764.19GPS 2890F-4MH525384.51151576098.34914767.94GPS 2891F-4MH525370.69381575363.81924768.75GPS 2892F-4SID 318MH525401.73101575028.55954761.66GPS 2893E-4MH525388.34111577953.56984770.68GPS 2894F-4MH525979.16541577090.43904758.66GPS 2895F-4SID 418MH527263.89101576835.19594748.39GPS 2896F-4SID 418MH527268.35621576516.55364752.91GPS 2897F-4SID 418MH527269.39181576120.00954754.45GPS 2898F-4MH527263.02601575767.21554752.34GPS 2899F-4SID424MH527261.75581575405.39194749.43GPS 7682900F-4MH527270.43611574695.59924750.35GPS 7792901G-4MH527273.23621574378.25824750.37GPS 2902G-4MH527282.94311574043.00064758.17GPS 2903G-4MH527287.88041573785.38524759.76GPS Page 11 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 2904H-7MH517654.24221571322.45674904.84GPS 2905H-7MH517496.77841571319.54094905.86GPS 2906H-7MH517753.75121571438.40184902.48GPS 2907H-7MH518112.99041571443.74954895.18GPS 2908H-7MH518107.08751571751.70204899.12GPS 2909G-7,H-7MH518106.14431571800.90884900.06GPS 2910G-7MH518134.04971572142.73624907.47GPS 2911G-7SID 447RDMH518083.68331574428.16374876.62GPS 2912F-7MH518082.02651574685.84474871.66GPS 2913F-7MH518066.30221575335.10664867.92GPS 7822914F-7SID 434DMH518065.72441575450.876584.904867.93Plans 2915F-7MH518120.44331575421.05704867.27GPS 2916E-7MH516862.75381577861.07324882.21GPS 2917E-7MH516732.52671578920.09324939.16GPS 2918E-7MH516618.19501579492.09124974.35GPS 2919E-7MH516865.72431578391.11864894.19GPS 2920E-7MH516871.63501578339.54574895.52GPS 7892921G-4, 5SID 981915DMH524323.43991572988.15074791.70GPS4801.60-9.90Plans4801.60 7902922G-4, 5SID 981915DMH523965.92011572978.83694795.72GPS4804.30-8.58Plans4804.30 7912923G-4, 5SID 981915DMH523606.78151572968.36424798.71GPS4809.50-10.79Plans4809.50 7922924G-5, 6SID 851915DMH523247.64281572957.89154806.34GPS4815.70-9.36Plans4815.70 7932925G-5, 6SID 851915DMH522890.14411572947.45014814.26GPS4825.50-11.24Plans4825.50 2926G-5MH522529.34131572938.17614825.86GPS 2927G-4 MH527387.17731572114.58264749.70GPS 2928G-4 MH527306.03041571896.74774752.98GPS 2929H-4MH527423.47071570820.36974752.39GPS 2930H-4MH527419.30071570781.11544751.25GPS 2931H-4MH527446.03861570071.05374751.66GPS 8002932H-3/4SID 444RDMH527487.67671569782.04344753.21GPS 2933I-4MH527474.33701569108.43944750.92GPS 2934I-4MH527468.17711569087.40094751.59GPS 2935I-4MH527468.00221569096.52454751.81GPS 2936I-4MH527474.36291568850.31964755.13GPS 2937I-4MH527479.97191568557.74724755.29GPS 2938I-4MH527479.34641568248.03194756.37GPS 2939J-5MH522386.82251565565.28494822.30GPS 2940J-5MH522452.63341565727.14224822.06GPS 2941J-5MH522793.58001566258.53724820.02GPS 2942J-5MH522965.79291566433.51014817.56GPS 2943J-5MH523154.34701566611.97534815.05GPS 2944I-5MH523484.57691566932.11374812.45GPS 2945I-5MH523528.34491567045.55414809.73GPS 2946I-5MH523602.63911567107.27864808.34GPS 2947I-5MH523752.23981567177.93324806.95GPS 2948I-5MH524122.55721567546.73124800.33GPS 2949I-5MH524156.34531567581.63114799.38GPS 2950I-4MH524847.93181568224.45154790.23GPS 2951I-4MH525043.42721568468.78424789.71GPS 2952I-4MH525068.53191568614.27264788.08GPS 2953H-6MH522100.96961570376.23154828.28GPS 8222954G-5/6SID 851915DMH522111.16991572925.75154831.28GPS4845.00-13.72Plans4845.00 8232955G-5SID 1801919DMH522103.24671573595.97794840.004823.53Plans4834.065.94Plans4834.06 8242956G-5SID 3051937DMH522101.20041573959.58594821.56GPS4837.50-15.94Plans4837.50 8252957F-5SID 99DMH522086.86261574536.47014823.44GPS4840.68-17.24Plans4840.68 8262958F-5SID 751914DMH522078.34231574895.44174835.93GPS4838.81-2.88Plans4838.81 2959F-5MH524616.69981577035.51454777.60GPS 2960F-5SID 104DMH524624.48481576457.9935796.204781.43Plans791.374.83Plans791.37 2961F-5MH524624.67971576105.32414779.54GPS 2962F-5MH524639.87441575740.53344781.73GPS 8312963F-5SID 751914DMH524652.78961574980.98004777.71GPS4789.56-11.85Plans4789.56 2964G-5MH524670.59721574651.10694791.68GPS 2965G-5524675.07661574417.37624787.63GPS 8342966G-5SID 2081920DMH524702.55591573326.04164804.604785.88Plans4798.705.90Plans4798.70 8352967G-4/5SID 981915DMH524710.49731572997.31254784.32GPS4795.40-11.08Plans4795.40 2968G-5MH524703.90671572656.30644781.59GPS 2969G-5MH524712.47511572294.87564784.61GPS 2970G-5MH524726.50021571991.18314784.26GPS 2971G-5MH524769.03381571997.84374786.89GPS 2972H-5MH524776.13241570600.31134796.93GPS 2973H-5MH524780.80491569928.58884788.65GPS 2974H-5MH524776.62381570061.10724789.10GPS 2975I-5MH524853.20741568890.72434786.50GPS 2976I-5MH524857.47491568582.53764785.12GPS 2977D-7MH518339.29491580184.06404972.77GPS 2978D-7MH518348.72981579520.32464990.09GPS 8472979D-7HBR1996RDMH518348.57661579528.32075005.304990.28Plans4995.509.80Plans4995.50 2980D-7HBR1996RDMH518297.87101579519.96554991.92GPS 8492981D-5HB1985RDMH523980.44031580355.61934808.004795.85Plans4803.504.50Plans4803.50 8502982D-5HB1985RDMH524341.13861580370.32354803.394787.59Plans4798.824.57Plans4798.82 8512983D-5HB1985RDMH524550.88411580470.53484803.534787.85Plans4797.496.04Plans4797.49 8522984D-5HB1985RDMH522114.93841580692.44824862.004846.74Plans4858.723.28Plans4858.72 2985C-5MH522116.99151582812.22384796.60GPS 2986C-5MH522413.51571582493.84184776.51GPS 2987C-5MH522421.12721582439.12274781.71GPS 2988C-5MH522374.00661582414.94084786.10GPS 2989D-5MH524041.10961580015.18384808.90GPS 2990H-2MH530819.35741569738.33624712.43GPS 2991H-2MH530207.99581569447.16644723.98GPS 2992H-2MH530219.88171569939.84154719.60GPS 2993H-2MH530201.55441570467.93274717.25GPS 2994H-3MH530085.02171569442.65544726.85GPS 2995H-3MH529531.84021569454.61184729.97GPS 2996H-3MH529060.93791569454.09614737.98GPS 2997H-3MH528977.21661569456.18304738.22GPS 8662998H-3/4SID 444RDMH527803.18251569757.53164746.64GPS 8672999H-3BSD1994RDMH528462.99041569747.00364771.154739.11Plans4768.362.79Plans4768.36 8683000H-3/4SID 444RDMH528023.10811569754.56894740.88GPS 3001H-4MH525724.98871570661.67404771.85GPS 3002H-4MH526135.85871570712.51884769.24GPS 3003H-4MH526171.42451570740.27414767.68GPS 3004H-4MH526553.82181570735.70824764.92GPS 3005H-4MH526981.62991570758.88134756.13GPS 8743006H-3/4SID 444RDMH526620.59311569734.75874760.07GPS 8753007H-3/4SID 444RDMH527056.63561569756.34674756.98GPS 3008H-4MH526177.94831569715.19764759.97GPS 3009I-5MH524369.76431568688.35244802.08GPS 3010I-5MH524537.68621568573.63794798.52GPS 3011I-5MH523967.94891568678.70064800.30GPS 3012I-5MH523748.19341568672.74434801.63GPS 3013I-5MH523706.85031568860.74844798.46GPS 3014I-5MH524051.28191568868.06944790.73GPS 3015I-5MH524412.08601568877.24264785.83GPS 3016I-5MH523868.20531567975.95374800.02GPS 3017I-5MH523329.98141568662.47054810.84GPS 3018I-5V524325.57011568169.21184791.02GPS grease trap 3019I-5MH524449.62481568031.81314794.25GPS 3020I-5MH523474.84961567097.13724806.41GPS 3021I-5MH524544.37741567368.79094790.49GPS 3022I-5MH524547.06711567142.92244791.75GPS 3023J-5MH523552.61881565693.98444802.15GPS 3024J-5MH523477.66471566094.54794805.92GPS 3025J-5MH524846.33741565312.38104779.98GPS 3026J-5MH524736.43721565310.58134783.66GPS 3027J-5MH524430.04201565544.47064787.51GPS 8963028E-1BCS, Ph 11993RDMH535211.21371578500.71054708.584677.25Plans4704.953.63Plans4704.95 8973029E-1BCS, Ph 11993RDMH535234.90281578035.07524704.114671.66Plans4700.123.99Plans4700.12 8983030E-1BCS, Ph 11993RDMH535160.25911577905.97034703.234666.20Plans4699.383.85Plans4699.38 8993031E-1BCS, Ph 11993RDMH535016.23801577801.07104702.284665.54Plans4698.004.28Plans4698.00 9003032E-1BCS, Ph 11993RDMH534432.82321578192.19564702.844670.29Plans4629.6973.15Plans4629.69 9013033E-1BCS, Ph 11993RDMH534502.48331578067.59904702.124668.93Plans4698.124.00Plans4698.12 9023034E-1BCS, Ph 11993RDMH534433.88011578308.30234703.334669.53Plans4699.413.92Plans4699.41 9033035E-1BCS, Ph 11993RDMH534464.37721579200.04604717.614683.42Plans4711.566.05Plans4711.56 9043036E-1BCS, Ph 11993RDMH534347.04521579243.63784716.264681.94Plans4712.413.85Plans4712.41 9053037E-1BCS, Ph 11993RDMH534237.56571578791.75594709.934679.01Plans4706.363.57Plans4706.36 9063038F-5SID 99DMH521699.77271574528.94914841.67GPS4853.04-11.37Plans4853.04 9073039G-6SID 228DMH521301.15591574523.56574880.77GPS4857.8022.97Plans4857.80 9083040F/G-6SID 2271921DMH520974.91891574508.59654857.53GPS4885.54-28.01Plans4885.54 9093041F/G-6SID 2271921DMH520976.66381574331.93384853.44GPS4867.62-14.18Plans4867.62 9103042G-6SID 228DMH520615.73001574500.68734860.90GPS4870.04-9.14Plans4870.04 3043G-6SID 371MH520246.65641574494.84464866.76GPS 3044G-6SID 371MH519889.10941574486.86424869.01GPS 3045G-6SID 372MH519896.90981573908.62264875.51GPS 9143046G-6SID 239DMH519908.70721573549.91804879.84GPS4884.33-4.49Plans4884.33 9153047G-6SID 239DMH520273.06261573545.10784875.41GPS4882.90-7.49Plans4882.90 3048G-6SID 372MH520259.37751573916.69754874.13GPS 3049G-6SID 372MH520621.91381573921.18454871.09GPS 9183050G-6SID 239DMH520625.43541573566.21864877.29GPS 9193051G-6SID 239DMH520876.39321573570.82334872.63GPS 9203052G-6SID 239DMH520987.98131573570.19314868.59GPS4880.04-11.45Plans4880.04 9213053F/G-6SID 2271921DMH520981.12041573928.17144866.20GPS4874.28-8.08Plans4874.28 3054G-6MH521696.59311574352.39724844.88GPS 9233055G-5, 6SID 2931935DMH521716.20201573586.09864856.884843.40Plans4850.006.88Plans4850.00 9243056G-5, 6SID 2931935DMH521722.52471573256.20934857.604845.19Plans4852.605.00Plans4852.60 9253057G-5, 6SID 851915DMH521720.84291572915.91154843.41GPS4830.0013.41Plans4830.00 3058G-5SID 99MH522500.03081574553.10534823.48GPS 3059G-5MH522861.19971574372.05054811.76GPS 9283060G-5SID 99DMH522857.42951574568.77424811.55GPS 9293061G-5SID 99DMH523218.08481574585.73614809.02GPS 3062G-5MH523218.41541574397.25334802.72GPS 3063G-5MH523576.04961574400.62064797.70GPS 3064G-5SID 99DMH523575.46351574602.43014799.85GPS 9333065F/G-5SID 1451916DMH523932.81461574620.55934809.774792.43Plans4803.805.97Plans4803.80 3066F-5SID 99DMH523937.06811574398.61754797.28GPS 3067G-5MH523944.00681574207.80024795.84GPS 9363068G-5SID 1451916DMH524291.29381574408.58534807.374796.35Plans4802.005.37Plans4802.00 9373069F-5SID 99DMH524293.50691574635.57344796.57GPS 9383070G-5SID 3051937DMH522512.85411573969.62894810.33GPS4828.50-18.17Plans4828.50 9393071G-5SID 1801919DMH522521.45141573606.65954825.04GPS4829.97-4.93Plans4829.97 9403072G-5SID 1801919DMH522872.39721573616.56474810.50GPS4821.07-10.57Plans4821.07 9413073G-5SID 3051937DMH522873.72761573975.21214813.44GPS4817.50-4.06Plans4817.50 9423074G-5SID 3051937DMH523226.27621573987.09644805.28GPS 9433075G-5SID 1801919DMH523234.77531573629.25304804.13GPS4813.19-9.06Plans4813.19 9443076G-5SID 1461917DMH523582.15021573996.68574800.48GPS4807.87-7.39Plans4807.87 9453077G-5SID 1451916DMH523941.27121574008.08074810.814799.89Plans4805.805.01Plans4805.80 9463078G-4/5SID 353DMH523951.35941573652.93434793.75GPS 9473079G-4/5SID 353DMH524313.54201573333.35314790.39GPS 9483080G-4/5SID 353DMH523957.70371573321.91824795.69GPS 3081G-5MH524318.52691572645.22804786.30GPS 3082G-5MH523961.01491572635.50424791.34GPS Page 12 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 3083G-5MH523608.42931572625.56724798.74GPS 3084G-5MH522551.79951572194.49434819.72GPS 3085G-5MH522889.38781572216.45024811.38GPS 3086G-5MH523248.01581572253.57684802.14GPS 3087G-5MH523602.28691572261.18764798.79GPS 3088G-5MH523964.70791572271.62094795.91GPS 3089G-5MH524327.08751572284.20714792.44GPS 3090F-6SID 389MH519434.21821574849.28074868.26GPS 3091F-6SID 389MH519898.36231574860.22684867.46GPS 3092F-6SID 389MH520267.41241574867.29954863.41GPS 3093F-6SID 389MH520600.33631574875.83344856.01GPS 9623094F/G-6SID 2271921DMH520959.55871574881.99984854.73GPS4853.661.07Plans4853.66 3095F-6MH521314.39861575630.55494841.02GPS 9643096F-6SID 449RDMH521118.01881576374.08414825.30GPS 9653097F-6SID 449RDMH521140.85601576552.34594823.29GPS 9663098F-6SID 449RDMH521133.47771576851.75744824.74GPS 9673099F-6SID 449RDMH520554.39301576845.17314832.88GPS 9683100F-6SID 449RDMH520559.35321576586.32544832.53GPS 9693101F-6SID 449RDMH520967.86101576332.44214825.88GPS 9703102F-6SID 449RDMH520564.36051576325.01764830.44GPS 3103F-6MH520563.58701576022.88604834.52GPS 9723104F-5SID 751914DMH522484.93581574912.66864816.95GPS4828.60-11.65Plans4828.60 9733105F-5SID 751914DMH522844.04351574924.78084804.38GPS4815.62-11.24Plans4815.62 9743106F-5SID 751914DMH523208.16401574932.16914808.53GPS4810.72-2.19Plans4810.72 9753107F-5SID 751914DMH523563.89661574949.13914800.35GPS4806.80-6.45Plans4806.80 9763108F-5SID 751914DMH523923.03521574959.61104793.83GPS4802.87-9.04Plans4802.87 9773109F-5SID 751914DMH524283.79821574970.93454791.56GPS4798.50-6.94Plans4798.50 3110F-5MH524265.88371575734.49464785.21GPS 3111F-5MH522826.10731575689.46964804.21GPS 3112F-5MH523050.76221575696.64634797.19GPS 3113F-5MH523183.59431575700.52494803.98GPS 3114F-5MH523545.95651575714.03234788.07GPS 3115F-5MH523908.31471575727.74484788.91GPS 3116F-5MH524265.36851576103.87384781.87GPS 3117F-5MH523902.59001576112.09944792.77GPS 3118F-5MH523475.96681576112.64084807.79GPS 3119F-5MH523046.18861576106.55854803.10GPS 3120F-5SID 104DMH524265.29341576450.2900799.304782.26Plans794.225.08Plans794.22 3121F-5MH524254.91361576820.71084783.12GPS 3122E-4MH525332.96551578702.77194766.45GPS 3123E-4MH525692.10561578798.76984762.04GPS 3124E-4MH525751.46521578526.71154762.51GPS 3125E-4MH526919.37951579144.19164741.27GPS 3126E-4MH526144.32601577976.05434758.25GPS 3127E-4MH526580.39261577996.40824755.94GPS 3128F-4MH525767.22251577961.23994765.29GPS 3129E-4MH526121.02631578935.17674755.29GPS 3130F-4MH525767.83021576131.33244762.72GPS 9993131F/G-4SID 408DMH525765.81111575037.99814766.64GPS 10003132F/G-4SID 408DMH526020.06171575041.94764758.86GPS 3133F-4MH526350.47911575009.92584756.87GPS 3134F-4SID424MH526914.08231575396.06294747.80GPS 10033135F-4SID 466DMH525997.31991575372.44374782.304760.59Plans 10043136F-4SID 466DMH525995.48061575725.28614780.704763.55Plans 10053137F-4SID 466DMH525975.23031575754.53534780.604765.15Plans 3138F-4MH526350.61491575773.41974760.88GPS 3139F-4MH526916.97901575758.63554749.53GPS 3140F-4MH526911.62951576123.40894749.77GPS 3141F-4MH526685.17631576124.50444755.45GPS 3142F-4MH526330.64311576130.63194758.60GPS 3143F-4MH526667.10411576468.21634754.82GPS 3144F-4MH525958.13611576132.82574764.28GPS 3145F-4MH525949.03281576779.13234766.88GPS 3146F-4MH525197.13971576457.48144773.02GPS 3147F-4MH525200.74861576097.90424774.78GPS 3148F-4MH525204.12191575750.62854775.65GPS 3149F-4MH525195.19411575702.77124776.43GPS 3150F-4MH525203.29961575365.43124775.31GPS 3151F-4MH525210.19731575005.50684774.37GPS 3152F-4MH524814.49231575361.97964778.74GPS 3153F-4MH524810.20281576099.54724776.24GPS 3154F-4MH524756.39961576252.85544769.89GPS 3155G-4MH526028.37771574693.63904761.26GPS 3156G-4MH526358.19391574692.98634757.88GPS 3157F/G-4SID 408DMH526925.94281574691.56094751.37GPS 10253158G-4MH526929.99781574479.97374752.90GPS 10273159F/G-4SID 408DMH526928.62111574380.57564752.53GPS 3160G-4MH526364.36291574371.09484765.34GPS 3161G-4MH526373.51381574064.84814768.34GPS 3162G-4MH526007.55791574067.67934775.52GPS 3163G-4MH525802.55301574062.62234776.46GPS 3164G-4MH526946.72261573778.53904764.26GPS 10333165G-4SID 433DMH526389.61341573139.224776.944761.13Plans73.203.74Plans73.20 3166G-4MH526041.92181573130.81734767.83GPS 3167G-4MH526020.62271573129.17864768.10GPS 3168G-4MH525794.31261573122.78994772.79GPS 3169G-4MH525802.85531572762.69224769.54GPS 3170G-4MH526030.81531572768.59984768.54GPS 3171G-4MH526048.83021572770.38084767.96GPS 10403172G-4SID 433DMH526403.06291572779.939176.844763.20Plans74.302.54Plans74.30 10413173G-4SID 433DMH526396.65051572943.282476.324763.30Plans72.423.90Plans72.42 10423174G-4SID 427DMH526409.41531572448.513878.084764.39Plans75.302.78Plans75.30 3175G-4MH526062.24051572413.14534762.44GPS 3176G-4MH525804.77041572405.95434767.23GPS 3177H-5MH522354.25921571714.35694815.51GPS 3178H-5MH522563.67181571575.10674812.07GPS 3179H-5MH522556.92301570899.98464820.14GPS 3180H-5MH522915.99321570914.04614814.97GPS 3181H-5MH522907.92141571249.54174812.24GPS 3182H-5MH522901.51741571583.63364809.50GPS 3183H-5MH523260.53051571600.66784806.57GPS 3184H-5MH523268.64151571263.12204808.19GPS 3185H-5MH523276.70351570928.13914809.57GPS 3186H-5MH523630.61361570612.19454808.07GPS 3187H-5MH523635.82061570939.74034805.33GPS 3188H-5MH523627.69381571278.10604802.57GPS 3189H-5MH523621.23481571615.06804802.39GPS 3190H-5MH524382.14111571723.28234789.24GPS 3191H-5MH524557.56551571730.74684788.65GPS 3192G-5CB524720.39721571967.17174787.39GPS 3193H-5MH523640.85251570506.04524800.35GPS 3194H-5MH523646.61031570205.68064798.05GPS 3195H-5MH524040.11281570221.01784797.75GPS 3196H-5MH524245.05721570229.25364792.64GPS 3197H-5MH524341.18601570179.10294793.54GPS 3198H-5MH524374.91661570045.81774790.90GPS 3199H-5MH522182.44911569549.58864826.51GPS 10683200K-4CS1992RDMH526050.34411563790.53814782.804767.24Plans4778.454.35Plans4778.45 10693201K-4CS1992RDMH527557.24841563500.60504764.404746.52Plans4760.134.27Plans4760.13 10703202K-4CS1992RDMH526810.23291563438.28574771.834751.48Plans4767.674.16Plans4767.67 10713203K-4CS1992RDMH526060.69191563422.06584781.974766.64Plans4777.134.84Plans4777.13 10723204K-4BPE1990RDMH526063.47101563191.58474781.304767.84Plans4776.414.89Plans4776.41 10733205K-4BPE1990RDMH526812.81541563218.05604772.004760.02Plans4766.765.24Plans4766.76 10743206K-4BPE1990RDMH527565.39441563246.94814764.504750.20Plans4759.804.70Plans4759.80 3207K-4MH527572.36561562883.43684749.41GPS 3208K-4MH527575.45021562722.59384748.06GPS 3209K-4SID 625DMH526829.39271562695.87744756.33GPS 3210K-4SID 625DMH526819.63391562948.06804754.29GPS 3211K-4MH526448.94631562940.95914761.51GPS 3212K-4MH526080.00511562671.66094763.77GPS 10813213K-4BPE1990RDMH526071.71941562932.59674765.53GPS 3214K-4MH525381.49891562646.57434774.76GPS 3215K-4MH525729.07851562660.82894770.50GPS 3216K-4MH525389.99321562374.77194772.05GPS 3217K-4MH526086.88081562398.69974762.45GPS 3218K-4SID 625DMH526847.55861562347.55304755.74GPS 3219K-4SID 625DMH526836.26251562423.22404755.40GPS 3220K-4MH527582.33171562449.32554742.27GPS 3221K-4MH527587.21131562194.88814746.56GPS 3222K-4MH524927.26211562632.53034779.43GPS 10913223K-5NP1996RDMH522964.11721563697.10244826.364813.08Plans4821.644.72Plans4821.64 10923224K-5NP1996RDMH522964.63231563670.24374826.354814.13Plans 10933225K-5NP1996RDMH522974.85821563308.12624824.884811.76Plans 10943226K-5NP1996RDMH522976.85371563204.07494824.274810.83Plans 10953227K-5NP1996RDMH522982.00171563106.75004824.884811.76Plans4819.894.99Plans4819.89 10963228K-5NP1996RDMH522988.69841562843.11654823.934811.16Plans 10973229K-5NP1996RDMH523170.70741562849.47854817.934805.07Plans 10983230K-5NP1996RDMH523341.25061562854.80014816.514802.75Plans 10993231K-5VCS1995RDMH523467.48641562860.40014816.064801.24Plans4810.066.00Plans4810.06 11003232K-5NP1996RDMH523340.75131562880.83864816.234800.97Plans 11013233K-5NP1996RDMH523328.38751563268.86044818.384802.71Plans 11023234K-5VCS1995RDMH524102.34011563124.54334807.334792.58Plans4801.995.34Plans4801.99 11033235K-5VCS1995RDMH524099.36501563194.11844807.574792.76Plans4802.425.15Plans4802.42 11043236K-5VCS1995RDMH524100.95681563025.55504806.984791.73Plans4801.445.54Plans4801.44 11053237K-5VCS1995RDMH524076.07711562868.37964806.844792.01Plans4800.556.29Plans4800.55 11063238K-5VCS1995RDMH523970.85761562879.18064807.704792.97Plans4802.235.47Plans4802.23 11073239K-5VCS1995RDMH523716.69301562870.71714811.554796.57Plans4806.255.30Plans4806.25 3240K-5SID 625DMH524072.92671562604.86534795.55GPS 3241K-5SID 625DMH524499.23511562620.73234785.45GPS 3242K-5MH524938.08271562324.98224777.68GPS 3243K-5MH524083.75911562296.70184787.18GPS 3244K-5MH524091.40171561983.75974790.00GPS 3245K-5MH524945.26131562036.23354779.23GPS 3246K-5MH524951.17921561727.66834778.27GPS 11153247K-5MH524959.96231561355.26894773.85GPS 3248K-5MH524100.96771561656.08724785.93GPS 11173249K-5VCBP1996RDMH522970.80991561294.76204817.644799.76Plans4814.643.00Plans4814.64 11183250K-5VCBP1996RDMH522736.30991561287.59814821.784804.89Plans4816.775.01Plans4816.77 11193251K-5VCBP1996RDMH522733.10901561454.49024821.654803.33Plans4817.124.53Plans4817.12 11203252K-5VCBP1996RDMH522728.93061561586.80384822.324804.29Plans4817.325.00Plans4817.32 11213253K-5VCBP1996RDMH522740.31471561763.20534821.384803.20Plans4818.612.77Plans4818.61 11223254K-5VCBP1996RDMH522666.52261561760.86714822.824805.28Plans4818.814.01Plans4818.81 11233255K-5VCBP1996RDMH522951.84971561770.03124822.454804.45Plans4816.475.98Plans4816.47 11243256K-5VCBP1996RDMH522841.98071561766.59094821.144803.23Plans4817.943.20Plans4817.94 3257K-5MH522841.63811561698.90044802.48GPS 11263258K-5VCBP1996RDMH522689.35511562281.44524826.134808.51Plans4821.764.37Plans4821.76 11273259K-5VCBP1996RDMH522622.10611562280.15554826.304807.34Plans4821.984.32Plans4821.98 11283260K-5MU1994RDMH522726.45961562742.30454826.324808.07Plans 11293261K-5MU1994RDMH522725.01881562560.76104825.664808.11Plans Page 13 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 11303262K-5VCBP1996RDMH522929.52441562506.33144825.824804.87Plans4819.036.79Plans4819.03 11313263K-5VCBP1996RDMH522935.91511562344.21784825.104804.41Plans4820.025.08Plans4820.02 11323264K-5VCBP1996RDMH522996.74781562508.95374822.634801.52Plans4818.634.00Plans4818.63 11333265K-5MU1994RDMH522930.05971562563.97554801.93GPS 11343266K-5VCBP1996RDMH522992.37031562566.09344822.894802.47Plans4817.255.64Plans4817.25 3267K-5SID 625MH523531.87381562583.10594794.31GPS 11363268K-5NP1996RDMH522919.63611563107.50244825.324815.12Plans 11373269K-5NP1996RDMH522803.19451563104.55154826.194821.85Plans4820.935.26Plans4820.93 11383270K-5NP1996RDMH522738.64411563133.66884826.704824.25Plans4821.165.54Plans4821.16 11393271K-5NP1996RDMH522715.26621563154.85884826.944823.25Plans4821.235.71Plans4821.23 11403272K-5NP1996RDMH522681.22131563218.91584827.554823.42Plans 11413273K-5NP1996RDMH522680.22721563356.31544828.514822.90Plans4821.517.00Plans4821.51 11423274K-5NP1996RDMH522668.81511563694.72104830.934822.50Plans 3275G-8MH515300.44701573164.09244917.19GPS 3276G-8MH515605.50851573171.06734913.76GPS 3277G-8MH515924.47721573222.91904908.57GPS 3278G-8MH516199.51281573341.10034903.30GPS 3279G-8MH516446.70541573542.22524899.09GPS 3280G-8SID 553DMH516435.19561574228.38524901.22GPS 3281G-8SID 553DMH516167.80081574225.20894904.97GPS 3282G-8SID 553DMH515892.25191574219.41524908.26GPS 3283G-8SID 553DMH515623.33071574210.26184910.78GPS 3284G-8SID 553DCB515604.42201574169.49394923.504911.67Plans4919.973.53Plans4919.97 3285G-8SID 553DMH515316.56411574206.63874916.00GPS 3286G-8SID 594MH514375.12761574185.62194929.70GPS 3287G-8SID 553DMH514632.62261574191.68494924.28GPS 3288G-8SID 553DMH514960.65931574198.48454915.81GPS 11573289E-5SID 1901920DMH524627.33261577508.17104777.03GPS4790.10-13.07Plans4790.10 11583290E-5SID 1901920DMH524263.25201577498.73354779.18GPS4792.20-13.02Plans4792.20 11593291E-5SID 1901920DMH523902.42811577490.58894787.64GPS4797.30-9.66Plans4797.30 11603292E-5SID 1901920DMH523466.15401577480.99854797.20GPS 3293E-5MH524612.06601577962.38484781.40GPS 1S6493294I-3AS, Ph 11985RDCB529943.62241568173.95894734.934715.93Plans4731.273.66Plans4731.27 11633295I-3AS, Ph 11985RDMH529943.18211568196.92174734.824716.65Plans4729.515.31Plans4729.51 11643296I-3AS, Ph 11985RDMH530146.53611568202.46124732.794716.67Plans4728.903.89Plans4728.90 11653297I-3AS, Ph 11985RDMH530145.84711568152.81364733.334717.15Plans4728.404.93Plans4728.40 3298I-3MH530174.57421567681.42714717.65GPS 3299I-3CB530178.44411567479.57944712.27GPS 1166 OR 3298? 3300I-3MH530153.85481567478.39014712.87GPS 11693301D-7HBR1996RDMH517905.75861579517.58045016.105000.84Plans5011.604.50Plans5011.60 3302E-7MH517034.41841578321.74414911.17GPS 3303E-7MH516908.61781578379.01894908.88GPS 3304E-7MH517179.79791578527.17224958.30GPS 3305E-7MH518345.29381579357.09894998.99GPS 3306E-4MH526924.08051579327.02714741.21GPS 3307F-3MH527646.18951576835.75324745.77GPS 3308F-3MH527648.97911576518.92494746.39GPS 3309F-3MH527649.75351576136.01534743.28GPS 3310F-3MH527653.29381575780.02704742.33GPS 3311F-3MH527655.31971575417.44644741.89GPS 3312F-3MH527656.80751575082.95444745.00GPS 3313F-3MH528391.43051575106.98034736.14GPS 3314F-3MH528387.34941575662.41904737.17GPS 3315F-3MH528386.24121575805.86614737.14GPS 3316F-3MH528012.42691575790.70364739.04GPS 3317F-3MH528010.49741576148.26084739.58GPS 3318F-3MH528006.48781576528.74974741.24GPS 3319F-3MH528003.62161576849.57594743.42GPS 3320F-3MH528368.17481576149.26964735.62GPS 3321F-3MH528360.45461576552.14584734.91GPS 3322F-3SID 424MH528374.62101576926.00934735.25GPS 3323J-4MH526162.58711565980.51174767.81GPS 3324J-4PO527495.98881565925.16604751.91GPS 3325J-4PI527467.82811565939.08564751.17GPS 3326I-4MH525657.25391567347.77424777.65GPS 3327I-4MH526199.89261568741.69234768.06GPS 3328I-4MH526229.78391568723.08844770.11GPS 3329I-4MH526192.75941569028.18534768.48GPS 3330F-7MH518251.28271576385.19264859.34GPS 3331F-7MH518279.28791576807.52484860.55GPS 3332F-7MH518282.61561576633.86594860.74GPS 3333F-7MH518283.88271576567.74424860.53GPS 3334F-7MH518620.46481576813.54984856.26GPS 3335F-7MH518900.95121576818.51434852.48GPS 3336F-7MH519320.87821576825.02294850.88GPS 3337F-7MH518908.05861576361.98784851.43GPS 3338F-7MH519115.61761575805.72524847.80GPS 12073339F-7SID 434DMH517877.12001575446.134088.504869.89Plans 3340F-7SID 4631966MH517759.36801575169.03854872.02GPS 3341F-7SID 4631966MH517494.46371574693.45374873.62GPS 3342F-7SID 4631966MH517408.74381574628.53644876.47GPS 3343F-7SID 4631966MH517261.22351574620.47914880.59GPS 3344F-7SID 4631966MH517518.90251575301.84974881.47GPS 3345F-8SID 548MH515243.12201575213.42134928.57GPS 3346I-4MH510539.85611575759.62664962.15GPS 3347F-9,F-10MH511381.35961576029.46794946.36GPS 3348F-9,F-10MH511382.14931575988.25694945.90GPS 3349F-10MH511212.66971575327.95464947.43GPS 3350F-10MH510147.39891575518.18304964.62GPS 26S6493351D-5SID 647RDMH522103.45391580949.32434855.00Plans4851.243.76Plans4851.24 3352J-0MH537096.00451565343.1906 3353J-0MH537107.75771564986.9533 3354I-2MH532260.07241568792.2402 3355J-1,K-1MH533165.83871562200.9666 3356J-1,K-1MH533171.48351561649.9704 3357J-1,K-1MH532932.20521561635.4341 3358J-1,K-1MH533573.30661561659.0101 3359J-1,K-1MH533573.66491561383.6699 3360J-1,K-1MH533178.32011561379.0616 3361J-1,K-1MH533635.48421561240.2600 3362D-6MH521676.68121580615.0350 3363D-6MH521038.12371579687.4270 9323364D-6MH521503.88361579699.6322 3365D-7MH518881.56931581255.6583 3366G-7MH517821.88131573448.2884 3367G-9MH511539.75161572987.4096 3368N-3MH530145.58581555932.0749 3369D-5MH522291.83081582079.3570 3370D-5MH522112.19291581349.6471 3371D-5MH522039.16381581564.4264 3372I-3,H-3MH527521.44411569475.6537 3373I-3,H-3MH527521.44411569475.6537 3374H-3MH528856.85621570770.4204 3375H-3MH528825.74011570938.5197 3376J-0MH537112.87121564805.8460 3377J-0MH536266.91491565368.6207 3378I-3MH528470.24891567827.8047 3379I-3MH528471.91951567740.6687 3380I-3MH528474.34771567528.4354 3381L-3,K-3MH528192.66581561425.1660 3382K-4MH526881.33731561869.5961 3383K-4MH526861.20251561892.7966 12303384L-4VWS, Ph 12002RDMH525013.68161559923.25094788.17Plans4783.334.84Plans4783.33could be a sanitary sewer MH 3385I-2MH531505.51141568524.5778 3386I-2MH531762.97201568532.1800 3387I-2MH531967.74571568549.2322 3388I-2MH532088.95741568560.0677 23VWP13389L-4VWS, Ph 12002RDMH4789.03Plans4784.304.73Plans4784.30 24VWP13390L-4VWS, Ph 12002RDMH4788.81Plans4783.055.76Plans4783.05 25VWP13391L-4VWS, Ph 12002RDDP4781.82Plans4781.820.00Plans4781.82 17VWP13392L-4VWS, Ph 12002RDMH4790.27Plans4785.524.75Plans4785.52 16VWP13393L-4VWS, Ph 12002RDMH4790.74Plans4784.076.67Plans4784.07 15VWP13394L-4VWS, Ph 12002RDMH4788.60Plans4783.415.19Plans4783.41 18VWP13395L-4VWS, Ph 12002RDDP4782.13Plans4782.130.00Plans4782.13 3396K-4SID 625DMH 3397K-4SID 625DPL 3398K-4SID 625DPB 3399K-4SID 625DPO 3400K-4SID 625DD 3401L-4VW12002RDPI4790.41Plans4787.582.83Plans4787.58 3402L-4VW12002RDPI4790.41Plans4787.163.25Plans4787.16 2VWP13403L-4VWS, Ph 12002RDV4790.41Plans4786.593.82Plans4786.59 3VWP13404L-4VWS, Ph 12002RDMH4790.50Plans4786.434.07Plans4786.43 5VWP13405L-4VWS, Ph 12002RDMH4787.00Plans4782.264.74Plans4782.26 7NWP13406L-4VW12002RDPO4781.38Plans 3407K-4VW1PO 3408K-4VW1PI 3409K-4VW1PI 3410K-4BPE1990RDPI 3411K-4BPE1990RDPO 3412K-4BPE1990RDPI 3413K-4BPE1990RDPO 3414K-4BPE1990RDPI 3415K-4BPE1990RDPO 3416K-4SID 625DPO 3417K-4SID 625DCB 3418K-4SID 625DPI 3419K-4SID 625DMH 3420K-4BPE1990RDPI 3421K-4BPE1990RDPI 3422K-4BPE1990DPO 3423K-4BPE1990DPI 3424K-4BPE1990DPI 3425K-4BPE1990DPI 25BPP23426K-4BPE1990RDMH4790.50Plans4783.247.26Plans4783.24 26BPP23427K-4BPE1990RDMH4791.50Plans4786.005.50Plans4786.00 27BPP23428K-4BPE1990RDCB 28BPP23429K-4BPE1990RDCB 30BPP23430K-4BPE1990RDCB 3431K-4BPE1990PO 3432K-4BPE1990PI 3433K-4BPE1990PI 3434K-4BPE1990PO 3435K-4BPE1990PI 3436K-4BPE1990PI 3437K-5VW1DMH 3438K-5VW1DMH 3439K-5VW1DCB 3440K-5VW1DMH Page 14 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 3441K-5VW1DMH 3442K-5SID 625DPI 3443K-5VCBP1996RDPI 4817.444817.44 3444K-5VCBP1996RDPI 4817.414817.41 3445K-5VCBP1996RDPI 4817.644817.64 3446K-5VCBP1996RDPI 4817.614817.61 32VCB3447K-5VCBP1996RDPO 4815.944815.94 21VCB3448K-5VCBP1996RDPI 4818.214818.21 1USDA3449K-5MU1994RDCB 2USDA3450K-5MU1994RDCB4824.31Plans 32153451K-5 3452K-5VCBP1996RDPI 4818.754818.75 3453K-5VCBP1996RDPI 4820.914820.91 3454K-5VCBP1996RDPI 4821.124821.12 3455K-5VCBP1996RDPI 4821.694821.69 3456K-5VCBP1996RDPI 4823.604823.60 3457K-5NP1996RDPL 4825.924825.92 3458K-5NP1996RDPL 4825.974825.97 33VCB3460K-5VCBP1996RDPO 4815.944815.94 31VCB3461K-5VCBP1996RDDP4818.06Plans4814.963.10Plans4814.96 3462K-5VCBP1996RDPL 4819.084819.08 3463K-5VCBP1996RDPL 4822.254822.25 3464K-5VCBP1996RDPL 4822.254822.25 3465K-5PO 3466K-5PI 3467K-5DN 3468K-5PO 3469K-5PI 3470K-5PO 3471K-5PI 3472K-5PO 3473K-5PI 3474K-5PO 3475K-5PI 3476K-5PO 3477K-5VCBP1996RDPL 4821.934821.93 3478J-0CCS, Ph 12002RDPO 4647.544647.54 3479J-0CCS, Ph 12002RDPI 4650.854650.85 3480J-0CCS, Ph 12002RDPO 4655.644655.64 3481J-0CCS, Ph 12002RDPO 4660.754660.75 3482J-0CCS, Ph 12002RDPI 4661.714661.71 3483J-0CCS, Ph 12002RDDP 4662.134662.13 3484J-0CCS, Ph 12002RDPO 4660.754660.75 3485J-0CCS, Ph 12002RDPI 4661.714661.71 3486J-3HCS, Ph 42001DMH4744.70Plans4738.875.83Plans4738.87 3487J-3HCS, Ph 42001DMH4740.20Plans4737.232.97Plans4737.23 3488J-3HCS, Ph 42001DPO 4736.804736.80 4HCP23489J-3DP 3490J-3HCS, Ph 3DRP 3491J-3HCS, Ph 42001DRP 3HPC23492J-3HCS, Ph 22000RDDP 2HCP23493J-3HCS, Ph 22000DP 7HCP13494J-3HCS, Ph 11999RDDP 6HCP13495J-3HCS, Ph 11999RDDP 3496J-0HCS, Ph 11999DDP 3497J-0PO 3498J-0PI 3499J-0PO 3500J-0PI 3501J-0PO 3502J-0PI 3503J-0PO 3504J-0PI 3505J-0PO 3506J-0PO 3507J-0PI 3508J-0PI 3509J-0PO 3510J-0D 3511J-4DP 3512J-4PO 3513J-4PO 3514J-4PO 3515J-4PI 3516J-4PO 3517J-4PI 3542F-6PI 2S4283543F-6SID 428DPO 20BCP13544E-1BCS, Ph 11993RDMH4709.01Plans4705.004.01Plans4705.00 19BCP13545E-1BCS, Ph 11993RDMH4790.00Plans4705.7084.30Plans4705.70 8483546D-7HBR1996RDMH5007.70Plans5001.206.50Plans5001.20 3547I-5V grease trap 4001D-5SID 647DPO 4849.004849.00 4002D-5SID 647DPI 4851.604851.60 4ES4003D-5ESC, SID 6471992DCB4862.30Plans4856.196.11Plans4856.19 4004D-5HB, SID 6471985DPI 4005D-5HB, SID 6471985DCB 4006D-5SID 647DPO 4007D-5SID 647DPO 17S6474008D-5SID 647RDMH4812.00Plans4807.944.06Plans4807.94 16S647D-5HB1985RDMH4805.00Plans near 2983 18S649D-5HB1985RDMH 4806.244806.24near 1591 8HBRD-7HBR1996RDMH5000.70Plans4993.177.53Plans4993.17near 2979 1BCP2E/F-0BCS, Ph 21996RDMH4698.13Plans near 1761 14BCP1E-1BCS, Ph 11993RDPO 4697.944697.94near 1777 2003E-3SID 1151916DCB near 1188 1843E-3SID 1151916DCB near 1188 6S115E-3SID 1151916DCB near 1188 11S190E-5SID 1901920DCB near 2466 12S190E-5SID 1901920DCB near 2466 13S190E-5SID 1901920DCB near 2466 14S190E-5SID 1901920DCB near 2466 15S190E-5SID 1901920DCB near 2466 1S190E-5SID 1901920DMH 4809.004809.00Church/Story int. 3S190E-5SID 1901920DCB Church/Story int. 4S190E-5SID 1901920DCB Church/Story int. 5S190E-5SID 1901920DCB Church/Story int. 6S190E-5SID 1901920DCB Church/Story int. 7S190E-5SID 1901920DCB Church/Story int. 8S190E-5SID 1901920DCB Church/Story int. 9S190E-5SID 1901920DCB Church/Story int. 10S190E-5SID 1901920DCB Church/Story int. 3S408F/G-4SID 408DCB near 1296 1S408F-4SID 408DCB near 2208 2S408F-4SID 408DMH near 2269 12S99F-5SID 99DCB near 1531 13S99F-5SID 99DCB near 1531 15S99F-5SID 99DCB near 1531 16S99F-5SID 99DCB near 1531 17S99F-5SID 99DCB near 1531 14S99F-5SID 99DCB near 1531 9S75F-5SID 751914DCB near 1533 10S75F-5SID 751914DCB near 1533 11S75F-5SID 751914DCB near 1533 12S75F-5SID 751914DCB near 1533 13S75F-5SID 751914DCB near 1533 14S75F-5SID 751914DCB near 1533 17S75F-5SID 751914DCB near 1553 20S75F-5SID 751914DCB near 1553 19S99F-5SID 99DCB near 1872 20S99F-5SID 99DCB near 1889 15S75F-5SID 751914DCB near 2064 16S75F-5SID 751914DCB near 2064 21S75F-5SID 751914DCB near 3107 19S55F-5SID 551912DCB near 2770 20S55F-5SID 551912DCB near 2770 9S55F-5SID 551912DCB near 2778 3S55F-5SID 551912DCB near 2779 4S55F-5SID 551912DCB near 2779 5S55F-5SID 551912DCB near 2779 6S55F-5SID 551912DCB near 2779 26S55F-5/6SID 551912DCB near 1867 27S55F-5/6SID 551912DCB near 1867 28S55F-5/6SID 551912DCB near 1867 29S55F-5/6SID 551912DCB near 1867 30S55F-5/6SID 551912DCB near 1867 31S55F-5/6SID 551912DCB near 1867 12S55F-5/6SID 551912DCB near 1080 13S55F-5/6SID 551912DCB near 1080 14S55F-5/6SID 551912DCB near 1080 1898F-5/6SID 551912DCB near 1083 10S55F-5/6SID 551912DCB near 1083 1S55F-5/6SID 551912DCB near 1087 1S320F-6SID 3201938DCB near 1098 2S320F-6SID 3201938DCB near 1098 10S99F-6SID 99DCB near 1796 11S99F-6SID 99DCB near 1796 1S455F-6SID 455RDMH near 2032 6S320F-6SID 3201938DCB near 1093 3S320F-6SID 3201938DCB near 1096 4S320F-6SID 3201938DCB near 1096 5S320F-6SID 3201938DCB near 1096 1S227F-6SID 2271921DCB near 1097 1WMP2F-9WMS, Ph 22003RDDP west of Graf/Fieldview int. 3WMP2F-9WMS, Ph 12002RDDP near 2673 1WMG-2WAL1993DDP near 1198 9EAIG-2EAI2002RDDP near 2715 10EAIG-2EAI2002RDDP near 2718 2WMG-2WAL1993DCO4724.18Plans4720.893.29Plans4720.89near 2819 3WMG-2WAL1993DCB near 2819 27S353G-4SID 353DCB near 1267 28S353G-4SID 353DCB near 1267 29S353G-4SID 353DCB near 1267 5S98G-4SID 981915DCB near 1275 6S98G-4SID 981915DCB near 1275 56S98G-4SID 981915DCB near 2850 57S98G-4SID 981915DCB near 2850 58S98G-4SID 981915DCB near 2850 59S98G-4SID 981915DCB near 2850 Page 15 of 16 Grate/Rim Elevation (see Notes 2 & 3)Invert Out Elevation (see Note 4Old GIS/MMI Junction 1/4 Section Subdivision Estimated Year Built Junction Location (see Note 1)Elevation Source Usedfrom Plansfrom Survey Source UsedCalculatedNumberNumberMap No.or SID NameYear Source TypeNorthing Eastingfrom Plansfrom GPSfrom Survey for G/R Elev.Invert Out Drop (ft)Drop (ft)for DropInvert Out Comments JUNC_NOMAP_NOSUB_SIDYBLTYBLT_SRCTYPENORTHINGEASTINGGREL_PLGREL_GPSGREL_SRVGREL_SRCIEO_PLDROP_IEODROP_SRVDROP_SRCIEO_CALCCOMMENTS 4S433G-4SID 433DPO near 2299 1S98G-4/5SID 981915DCB near 1263 3S98G-4/5SID 981915DCB near 1265 4S98G-4/5SID 981915DCB near 1266 54S353G-4/5SID 353DCB near 2921 2S353G-4/5SID 353DCB near 2922 32S98G-4/5SID 981915DCB near 2923 3S353G-4/5SID 353DCB near 3078 10S180G-5SID 1801919DCB near 1523 7S180G-5SID 1801919DCB near 1523 8S180G-5SID 1801919DCB near 1523 12S180G-5SID 1801919DCB near 1523 11S180G-5SID 1801919DCB near 1523 2346G-5SID 3051937DCB near 1530 5S208G-5SID 2081920DCB near 1566 2790G-5SID 1801919DCB near 1974 2S180G-5SID 1801919DCB near 1976 3S180G-5SID 1801919DCB near 1976 4S180G-5SID 1801919DCB near 1976 5S180G-5SID 1801919DCB near 1976 9S180G-5SID 1801919DCB near 1523 10S180G-5SID 1801919DCB near 1523 4S305G-5SID 3051937DCB near 3070 7S305G-5SID 3051937DCB near 3073 5S146G-5SID 1461917DCB near 1978 1S145G-5SID 1451916DMH4811.26Plans4806.674.59Plans4806.67near 1994 2S145G-5SID 1451916DCB near 1994 3S145G-5SID 1451916DCB near 1994 2798G-5SID 1461917DCB near 1982 2S85G-5/6SID 851915DCB near 1457 3S85G-5/6SID 851915DCB near 1457 1S85G-5/6SID 851915DCB near 1457 4S85G-5/6SID 851915DCB near 1468 5S85G-5/6SID 851915DCB near 1468 15S85G-5/6SID 851915DCB near 1869 14S85G-5/6SID 851915DCB near 1869 13S85G-5/6SID 851915DCB near 1869 11S85G-5/6SID 851915DCB near 1869 57S85G-5/6SID 851915DCB near 2954 8S85G-5/6SID 851915DCB near 2954 9S85G-5/6SID 851915DCB near 2954 10S85G-5/6SID 851915DCB near 2954 6S85G-5/6SID 851915DCB near 2954 7S85G-5/6SID 851915DCB near 2954 2617G-6SID 228DCB near 1801 10S239G-6SID 239DCB near 1831 11S239G-6SID 239DCB near 1831 12S239G-6SID 239DCB near 1831 13S239G-6SID 239DCB near 1831 15S239G-6SID 239DCB near 1831 2662G-6SID 239DCB near 1843 2663G-6SID 239DCB520655.98891573513.06714873.44GPS near 1843 1S239G-6SID 239DCB near 1851 2S239G-6SID 239DCB near 1851 4S239G-6SID 239DCB near 1851 13S293G-6SID 2931935DCB near 1858 7S228G-6SID 228DCB near 1810 7S239G-6SID 239DCB near 3047 8S239G-6SID 239DCB near 3047 9S239G-6SID 239DCB near 3047 5S239G-6SID 239DCB near 3051 6S239G-6SID 239DCB near 3051 7S447G-7SID 447RDCB near 1408 2S447G-7SID 447RDMH near 2869 4BP2I-3BS, Ph 21995RDDP 4731.554731.55near 2490 3BP2I-3BS, Ph 21995RDDP 4735.714735.71near 2492 1CAP2I-3CA, Ph 22003RDDP 4732.754732.7525th/Oak int. 2CAP2I-3CA, Ph 22003RDDP 25th/Oak int. 3CAP2I-3CA, Ph 22003RDDP 25th/Oak int. 10CAP2I-3CA, Ph 22003RDMH4733.10Plans4729.983.12Plans4729.9825th/Oak int. 11CAP2I-3CA, Ph 22003RDMH4731.95Plans4729.352.60Plans4729.3525th/Oak int. 12CAP2I-3CA, Ph 22003RDMH4732.93Plans4728.814.12Plans4728.8125th/Oak int. 13CAP2I-3CA, Ph 22003RDMH4733.00Plans4728.534.47Plans4728.5325th/Oak int. 5BP2I-3BS, Ph 21995RDDP 4745.954745.95near 2654 1YCP2I-6YC, Ph 22000RDDP near 1109 2YCP2I-6YC, Ph 22000RDDP near 1109 3YCP2I-6YC, Ph 22000RDDP near 1109 2CCP1J-0CCS, Ph 12002RDDP 4647.544647.54near 3478 3CCP1J-0CCS, Ph 12002RDDP near 3480 4CCP1J-0CCS, Ph 12002RDDP near 3483 2HCP2J-3HCS, Ph 22000RDDP near 1258 1WSJ-4WS1996RDDP near 2542 10BMP1J-5BMS1995RDDP near 1753 14BMP1J-5BMS1995RDDP near 1754 17BMP1J-5BMS1995RDCB near 1757 2BI2J-5BIH, Ph 21997RDC west of Babcock/Wilda int. 3BI2J-5BIH, Ph 21997RDC west of Babcock/Wilda int. 4BI2J-5BIH, Ph 21997RDDP west of Babcock/Wilda int. 5BI2J-5BIH, Ph 21997RDDP west of Babcock/Wilda int. 6BI2J-5BIH, Ph 21997RDDP west of Babcock/Wilda int. 7BI2J-5BIH, Ph 21997RDDP west of Babcock/Wilda int. 11BPP2K-4BPE1990RDCB near 2374 12BPP2K-4BPE1990RDCB near 2374 30VCBK-5VCBP1996RDDP near 3249 Page 16 of 16 Bozeman Storm Water Facilities Plan Appendix A-2: Link Spreadsheet CITY OF BOZEMAN STORM DRAIN SYSTEM DOCUMENTED STORM DRAIN DATA - LINKS CODE LISTINGS File: P:\Water\11206 Bozeman\10944 Stormwater Facilties Plan\Task 200 Existing System Inventory\Data\EXCEL SPREAD SHEET\[Storm Drain Data.xls]Links 1/4 Section Subdivision/SID:Est. Year Built - Source Grid Map No.SymbolName (number/filing as noted in table) D Design Drawing (some partial copies, may be RD but copies are not marked)I-3 AS Annie Subdivision/SID 649 EST Rough Estimate (see comments noted in table) J-5 BMS Babcock Meadows Subdivision RD Record Drawing L-1*BME Baxter Meadows Estate Homes H-3 BSD Blackmore Storm Drain J-5 BIH Bozeman Interfaith Housing Link TypeI-3 BS Brentwood Subdivision E-0, E-1, F-0 BCS Bridger Creek Subdivision CUL Culvert K-4 BPE Bridger Peaks Estates Subdivision CG Cross Gutter K-4 CS Cascade Subdivision D Ditch I-3 CA Castlebar Apartments SD Storm Drain (part of pipe network)J-0 CCS Cattail Creek Subdivision F-8 C&SC Circle Drive and Spring Creek Drive/SID 531 G-2, G-3 EAI Eleventh Ave. Improvements Link Shape D-5 ESC Ellis Street I-0*GCS Gallatin Center Street & Storm Plans A Arch PipeD-1*H The Headlands C Circular Pipe J-3 HCS Harvest Creek Subdivision E Elliptical Pipe D-5 HB Highland Boulevard/SID 647 T Trapezoidal Ditch D-7 HBR Highland Boulevard Reconstruction V V-Ditch C-5*KM Kamp Minor SibdivisionI-1*LCC Lewis & Clark Commercial Subdivision K-5 MU Master Utility (Fallon St. & Private Dr.)Link Material K-5 NP Nelson Property L-5*SCV The Spring Creek Village Resort CMP Corrugated Metal Pipe SID (#)Special Improvement District (SID # as noted in table)CONC ConcreteK-5 VCBP Valley Commons Business Park HDPE High Density Polyethylene Pipe K-5 VCS Valley Creek Subdivision N Natural (rock and/or soil) L-4 VWS Valley West Subdivision PVC Polyvinyl Chloride Pipe G-2 WAL Bozeman, Montana Wal-Mart RCP Reinforced Concrete Pipe G-9, G-10*WFS Westfield South U UnknownF-9 WMS West Meadow Subdivision VCP Vitrified Clay Pipe J-4 WS Willow Subdivision WSP Welded Steel Pipe I-6 YC Yellowstone Center * indicates 1/4 section grid maps that do not exist Column Input Source Notes GPS Data compiled by City Staff1. For comparison, length and slope data is listed in two columns: a) as shown on the Plans; and Logged from City's Drawings by MMI b) as calculated from the City's GPS survey points. Excel Formula - DO NOT ENTER DATA DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. From NumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 8S6471591_1592D-515911592HB1985RDSDCRCP12 0.87S6471592_2981D-515922981HB1985RDSDCRCP12522.8 11S6471593_2981D-515932981HB1985RDSDCRCP12323.1 15S6471594_4008D-515944008HB1985RDSDCRCP12324.2 14S6471595_1594D-515951594HB1985RDSDCRCP12260.5 6S6471596_2982D-515962982HB1985RDSDCRCP12325.25S6471597_1596D-515971596HB1985RDSDCRCP12260.5 2S6471598_2983D-515982983HB1985RDSDCRCP123010.1 22S6471640_3351D-516403351HB1985RDSDCRCP241082.9 21S6471641_1640D-516411640HB1985RDSDCRCP24452.9 1642_1643D-516421643SD1643_4006D-516434006SD 1644_1645D-516441645SD 4S6472981_2982D-529812982SID 647DSDCRCP243591.3 4S6472981_2982D-529812982HB, SID 6471985RDSDCRCP243591.3 3S6472982_2983D-529822983HB, SID 6471985DSDCRCP242330.573S6472982_2983D-529822983HB, SID 6471985RDSDCRCP242330.57 19S6472984_1641D-529841641HB, SID 6471985RDSDCRCP241052.9 24S6473351_4001D-533514001HB, SID 6471985RDSDCRCP24832.7 23S6474002_3351D-540023351HB, SID 6471985RDSDCRCP2414 2ES4003_1641D-540031641Esc1992RDSDCRCP12620.84004_2984D-540042984HB, SID 6471985DSDCRCP24 20S6474005_2984D-540052984HB, SID 6471985RDSDCRCP12102.8 12S6474008_2981D-540082981HB, SID 6471985RDSDCRCP241532.9 13S647D-5HB, SID 6471985RDSDCRCP24 1ESD-5ESC1992RDSDCRCP12270.81S647D-5HB, SID 6471985RDSDCRCP24860.57 3ESD-5ESC1992RDCULCCMP12150.8 9S647D-5HB, SID 6471985RDSDCRCP12804.2 7HBR1584_1585D-715841585HBR1996RDSDCRCP12350.3 6HBR1585_2979D-715852979HBR1996RDSDCRCP151550.31586_1587D-715861587SD 2HBR2500_3301D-725003301HBR1996RDSDCPVC1222 1HBR2501_3301D-725013301HBR1996RDSDCRCP1240 3HBR3301_3546D-733013546HBR1996RDSDCRCP152873.45 4HBR3546_2979D-735462979HBR1996RDSDCRCP151571.915HBRD-7HBR1996RDSDCU181201.98 1645_4007D-S16454007SD 2BCP2E/F-0BCS, Ph 21996RDSDCRCP1236 3BCP2E/F-0BCS, Ph 21996RDSDCRCP/HDPE 1220 4BCP2E/F-0BCS, Ph 21996RDSDCHDPE122231185_2811E/F-311852811SD 1186_2811E/F-311862811SD 1759_1760E-017591760 1BCP3E-0BCS, Ph 31998RDCULCRCP18200.7 2BCP3E-0BCS, Ph 31998RDCULCRCP18701.383BCP3E-0BCS, Ph 31998RDCULCRCP24744.24 4BCP3E-0BCS, Ph 31998RDCULCRCP18408.28 2BCP11766_1767E-117661767BCS, Ph 11995RDCULCRCP481201 1768_3028E-117683028BCS, Ph 11995RDSDCRCP15 3BCP11769_3028E-117693028BCS, Ph 11995RDSDCRCP153215BCP11770_3029E-117703029BCS, Ph 11995RDSDCRCP15321 1771_3029E-117713029BCS, Ph 11995RDSDCRCP 8BCP11772_3031E-117723031BCS, Ph 11995RDSDCRCP18510.77 1773_3031E-117733031BCS, Ph 11995RDSDCRCP18 9BCP11774_1775E-117741775BCS, Ph 11995RDCULCRCP18840.510BCP11776_3033E-117763033BCS, Ph 11995RDSDCRCP15161 13BCP11778_1776E-117781776BCS, Ph 11995RDSDCRCP12121 17BCP11779_3034E-117793034BCS, Ph 11995RDSDCRCP15321 1780_3034E-117803034BCS, Ph 11995RDSDCRCP15 27BCP11782_3035E-117823035BCS, Ph 11995RDSDCRCP155129BCP11783_3036E-117833036BCS, Ph 11995RDSDCRCP15321 1784_3036E-117843036BCS, Ph 11995RDSDCRCP15 31BCP11786_1785E-117861785BCS, Ph 11995RDCULCRCP48980.61 22BCP11789_3037E-117893037BCS, Ph 11995RDSDCRCP15321 21BCP11790_3037E-117903037BCS, Ph 11995RDSDCRCP12120.284BCP13028_3029E-130283029BCS, Ph 11995RDSDCRCP154581 6BCP13029_3030E-130293030BCS, Ph 11995RDSDCRCP181570.48 7BCP13030_3031E-130303031BCS, Ph 11995RDSDCRCP181780.77 15BCP13032_3033E-130323033BCS, Ph 11995RDSDCRCP241430.4 11BCP13033_1777E-130331777BCS, Ph 11995RDSDCRCP24160.416BCP13034_3032E-130343032BCS, Ph 11995RDSDCRCP241150.63 26BCP13035_3544E-130353544BCS, Ph 11995RDSDCRCP154121.42 30BCP13036_3035E-130363035BCS, Ph 11995RDSDCRCP151250.68 24BCP13037_3545E-130373545BCS, Ph 11995RDSDCRCP181580.42 28BCP13544_3034E-135443034BCS, Ph 11995RDSDCRCP244821.1625BCP13545_3544E-135453544BCS, Ph 11995RDSDCRCP15450.42 12BCP1E-1BCS, Ph 11995RDSDCRCP24300.4 18BCP1E-1BCS, Ph 11995RDSDCRCP12121 1BCP1E-1BCS, Ph 11995RDCULCCMP2420' ea. Side of Rd. 23BCP1E-1BCS, Ph 11995RDSDCRCP12120.281030_2764E-310302764SD 1031_1032E-310311032SD 1032_2764E-310322764SD 1033_1032E-310331032SD 1034_2764E-310342764SD1035_2764E-310352764SD 1036_2764E-310362764SD 1037_2765E-310372765SD 1038_2765E-310382765SD 1039_2765E-310392765SD1040_2765E-310402765SD 1041_2765E-310412765SD 1042_2765E-310422765SD 1043_2766E-310432766SD 1044_2766E-310442766SD1045_2766E-310452766SD 1046_2766E-310462766SD 1047_2766E-310472766SD 1048_2766E-310482766SD 1049_2767E-310492767SD1050_2767E-310502767SD 1187_2812E-311872812 2S1151188_2812E-311882812SID 1151916D 2762_2764E-327622764SD10 Page 1 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 2764_2765E-32764276515SD15 2765_2766E-32765276615SD152767_2766E-327672766SD10 1S115E-3SID 1151916D 3S115E-3SID 1151916D 4S115E-3SID 1151916D 5S115E-3SID 1151916D 2300.95651021_2762E-410212762SD 1022_2762E-410222762SD 1023_2762E-410232762SD 1024_2762E-410242762SD 1025_2763E-410252763SD1026_2763E-410262763SD 1112_2789E-411122789SD 1113_2789E-411132789SD 1114_2790E-411142790SD 1115_2790E-411152790SD1116_2791E-411162791SD 1117_2791E-411172791SD 1118_2792E-411182792SD 1119_2792E-411192792SD 1120_2793E-411202793SD1121_2793E-411212793SD 1122_2794E-411222794SD 1123_2795E-411232795SD 1124_2795E-411242795SD 1125_2796E-411252796SD1126_2796E-411262796SD 1128_2797E-411282797SD 1129_2797E-411292797SD 1370_2893E-413702893SD 1371_2893E-413712893SD1372_2893E-413722893SD 2174_3122E-421743122SD 2175_3122E-421753122SD 2176_3122E-421763122SD 2177_3122E-421773122SD2178_3124E-421783124SID 585RDSDCRCP1214 2179_3124E-421793124SID 585RDSDCRCP1246 2180_3124E-421803124SID 585RDSDCRCP1274 2181_3129E-421813129SID 613DSDCRCP1212 2182_3129E-421823129SID 613DSDCRCP12352185_3126E-421853126SD 2186_3126E-421863126SD 2187_3126E-421873126SD 2188_3126E-421883126SD 2189_3126E-421893126SD2190_3126E-421903126SD 2191_3126E-421913126SD 2192_3126E-421923126SD 2193_3127E-421933127SD 2194_3127E-421943127SD2195_3127E-421953127SD 2196_3127E-421963127SD 2197_3127E-421973127SD 2198_3127E-421983127SD 2199_3127E-421993127SD2200_3127E-422003127SD 2201_3128E-422013128SD 2202_3128E-422023128SD 2203_3128E-422033128SD 2763_2812E-427632812SD2789_2790E-427892790SD 2790_2791E-427902791SD 2791_2792E-427912792SD 1794_2793E-427942793SD 2795_2794E-427952794SD182796_2797E-427962797SD 2797_2893E-427972893SD 2798_2801E-427982801SD12 2893_3128E-428933128SD10 3124_3123E-431243123SID 585RDSDCRCP154153125_3306E-431253306SD 3126_3127E-431263127SD 3127_2762E-431272762SD10 3128_3126E-431283126SD 1657_1658E-516571658SD52S1902465_3289E-524653289SID 1901920D 44S1902466_3289E-524663289SID 1901920D 45S1902467_3289E-524673289SID 1901920D 42S1902468_2469E-524682469SID 1901920D 36S1902469_3290E-524693290SID 1901920D33S1902470_3290E-524703290SID 1901920D 37S1902471_2470E-524712470SID 1901920D 38S1902472_2473E-524722473SID 1901920D 34S1902473_3290E-524733290SID 1901920D 39S1902474_2473E-524742473SID 1901920D40S1902475_2476E-524752476SID 1901920D 35S1902476_3290E-524763290SID 1901920D 41S1902477_2476E-524772476SID 1901920D 26S1902478_3291E-524783291SID 1901920D 28S1902479_2478E-524792478SID 1901920D29S1902480_2481E-524802481SID 1901920D 27S1902481_3291E-524813291SID 1901920D 30S1902482_2481E-524822481SID 1901920D 31S1902483_3291E-524833291SID 1901920D 2486_3293E-524863293SD2487_3293E-524873293SD 43S1903290_3289E-532903289SID 1901920DSDC123710.5668 32S1903291_3290E-532913290SID 1901920DSDC123511.4617 25S1903292_3291E-532923291SID 1901920DSDC84441.25 16S190E-5SID 1901920D17S190E-5SID 1901920D 18S190E-5SID 1901920D 19S190E-5SID 1901920D 20S190E-5SID 1901920D 21S190E-5SID 1901920D22S190E-5SID 1901920D 23S190E-5SID 1901920D 24S190E-5SID 1901920DSDC84921.25 46S190E-5SID 1901920D 47S190E-5SID 1901920D48S190E-5SID 1901920D 49S190E-5SID 1901920D 50S190E-5SID 1901920D 51S190E-5SID 1901920DSDC123041.25 1421_1420E-714211420SD1422_2916E-714222916SD 1423_2916E-714232916SD 1424_2919E-714242919SD 1425_3303E-714253303SD 1426_2917E-714262917SD1427_2917E-714272917SD 1428_2918E-714282918SD 1429_2918E-714292918SD 1430_2918E-714302918SD 2503_3303E-725033303SD2504-2505E-725042505SD 2505_3304E-725053304SD 2917_2919E-729172919SD15 2918_2917E-729182917SD 2919_2920E-729192920SD3302_3303E-733023303SD 3303_2919E-733032919SD 3304_3302E-733043302SD12 5S4083131_3132F/G-431313132SID 408DSDCRCP15255 6S4083157_3159F/G-431573159SID 408DSDCRCP154S408F/G-4SID 408DSDCRCP15360 3S2271808_3041F/G-618083041SID 2271921D 6S2271808_3041F/G-618083041SID 2271921D 4S2271809_3041F/G-618093041SID 2271921D 7S2271809_3041F/G-618093041SID 2271921D17S2273040_3041F/G-630403041SID 2271921DSDC151761.6 5S2273041_3053F/G-630413053SID 2271921DSDC124041.6 13S2273094_2782F/G-630942782SID 2271921DSDC183600.5 10S227F/G-6SID 2271921DSDC183750.5 11S227F/G-6SID 2271921D12S227F/G-6SID 2271921D 14S227F/G-6SID 2271921D 15S227F/G-6SID 2271921D 16S227F/G-6SID 2271921DSDC203720.5 2S227F/G-6SID 2271921DSDC123601.68S227F/G-6SID 2271921D 9S227F/G-6SID 2271921D 2898_3310F328983310SD15 2899_3311F328993311SD 1183_2810F-311832810SD1184_2810F-311842810SD 2508_3307F-325083307SD 2509_3307F-325093307SD 2510_3308F-325103308SD 2511_3308F-325113308SD2512_3309F-325123309SD 2513_3309F-325133309SD Page 2 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 2514_3310F-325143310SD 2515_3310F-325153310SD2516_3310F-325163310SD 2517_3311F-325173311SD 2518_3311F-325183311SD 2519_3312F-325193312SD 2521_3313F-325213313SD2522_3313F-325223313SD 2523_3313F-325233313SD 2524_3314F-325243314SD 2525_3314F-325253314SD 2526_3315F-325263315SD2527_3315F-325273315SD 2528_3316F-325283316SD 2529_3317F-325293317SD 2530_3318F-325303318SD 2531_3318F-325313318SD2532_3319F-325323319SD 2533_3319F-325333319SD 2534_3320F-325343320SD 2535_3320F-325353320SD 2536_3321F-325363321SD2537_3321F-325373321SD 2538_3322F-325383322SD 2539_3322F-325393322SD 3307_3308F-333073308SD 3308_3318F-333083318SD3309_3317F-333093317SD 3310_3316F-333103316SD 3311_3310F-333113310SD18 3313_3314F-333133314SD15 3314_3315F-333143315SD183315_3320F-333153320SD30 3316_3315F-333163315SD18 3317_3320F-333173320SD15 3318_3321F-333183321SD15 3319_3318F-333193318SD153320_3321F-333203321SD 3321_3322F-333213322SD 3322_2811F-333222811SD30 1051_2768F-410512768SD 1052_2768F-410522768SD1136_1138F-411361138SD 1138_2801F-411382801SD37 1139_1138F-411391138SD 1141_1140F-411411140SD 1142_1143F-411421143SID 104SD1143_3146F-411433146SD 1144_2805F-411442805SD 1147_2803F-411472803SD 1148_2803F-411482803SD 1149_2803F-411492803SD1151_2804F-411512804SD 1154_2805F-411542805SD 1155_2805F-411552805SD 1156_2805F-411562805SD 1157_2805F-411572805SD1259_2845F-412592845SD 1260_2845F-412602845SD 1295_2866F-412952866 1296_2866F-412962866 1355_2890F-413552890SD1356_2890F-413562890SD 1357_2890F-413572890SD 1358_2890F-413582890SD 1359_2890F-413592890SD 1360_2890F-413602890SD1361_2891F-413612891SD 1362_2891F-413622891SD 1363_2241F-413632241SD 1364_2892F-413642892SD 1365_2892F-413652892SD1366_2892F-413662892SD 1367_2892F-413672892SD 1368_2892F-413682892SD 1369_2892F-413692892SD 1379_2895F-413792895SD1380_2895F-413802895SD 1381_2896F-413812896SD 1382_2896F-413822896SD 1383_2897F-413832897SD 1384_2897F-413842897SD1385_2898F-413852898SD 1386_2898F-413862898SD 1387_2899F-413872899SD 1388_2899F-413882899SD 2204_3130F-422043130SD2205_3130F-422053130SD 2206_3131F-422063131 2207_3131F-422073131 2208_3131F-422083131 2209_3131F-4220931312210_3131F-422103131 2211_3131F-422113131 2212_3131F-422123131 2213_3132F-422133132 2214_3132F-4221431322215_3133F-422153133SD 2216_3134F-422163134SD 2217_3134F-422173134SD 2218_3135F-422183135 2219_3135F-4221931352220_3135F-422203135 2221_3136F-422213136 2222_3136F-422223136 2223_3137F-422233137 2224_3138F-422243128SD2225_3138F-422253138SD 2226_3139F-422263139SD 2227_3139F-422273139SD 2228_3140F-422283140SD 2229_3141F-422293141SD2230_3142F-422303142SD 2231_3142F-422313142SD 2232_3143F-422323143SD 2233_3143F-422333143SD 2234_3144F-422343144SD2235_3144F-422353144SD 2238_3146F-422383146SD 2239_3150F-422393150SD 2240_3150F-422403150SD 2241_2891F-422412891SD2247_3152F-422473152SD 2248_2247F-422482247SD 2249_2248F-422492248SD 2250_2249F-422502249SD 2251_2250F-422512250SD2252_2251F-422522251SD 2253_2254F-422532254SD 2254_2256F-422542256SD 2255_2256F-422552256SD 2256_2257F-422562257SD2257_3253F-422573253SD 2258_3153F-422583153SD 2264_2263F-422642263SD 2265_2264F-422652264SD 2275_3157F-422753157SD2276_3157F-422763157SD 2768_3152F-427683152SD 2799_2800F-427992800SD 2801_2800F-428012800SD 2804_3150F-428043150SD122805_3147F-428053147SD 2867_3151F-428673151SD20 2890_3147F-428903147SD 2891_3150F-428913150SD 2892_3131F-428923131SD2895_2812F-428952812SD27 2896_2895F-428962895SD 2897_2896F-428972896SD27 2961_3153F-429613153SD 2963_2803F-429632803SD3128_3142F-431283142SD 3130_3144F-431303144SD 3132_3155F-431323155SID 408SD18 3133_3156F-431333156SD15 3134_2899F-431342899SD151S4663135_3136F-431353136SID 466DSDCRCP153600.333 3136_3137F-431363137 3137_3144F-431373144SD15 3139_2898F-431392898SD15 3140_2897F-431402897SD243141_3140F-431413140SD21 3142_3141F-431423141SD Page 3 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 3143_3141F-431433141SD15 3144_3142F-431443142SD153146_2799F-431462799SD36 3147_3146F-431473146SD33 3148_3147F-431483147SD30 3149_3148F-431493148SD 3150_3149F-431503149SD273151_3150F-431513150SD27 3152_2804F-431522804SD 3157_2900F-431572900SD 1051_2768F-510512768 1052_2768F-5105227681053_2769F-510532769 1054_2769F-510542769 1055_2774F-510552774 1056_2774F-510562774 1057_2774F-5105727741058_2774F-510582774 1059_2774F-510592774 1060_2774F-510602774 1061_2774F-510612774 1062_2774F-5106227741063_2775F-510632775 1064_2775F-510642775 1065_2775F-510652775 1066_2775F-510662775 1067_2775F-5106727751068_2775F-510682775 1069_2775F-510692775 1070_2775F-510702775 1071_2776F-510712776 1072_2776F-5107227761073_2776F-510732776 1074_2776F-510742776 1075_2776F-510752776 1076_2776F-510762776 1077_2776F-5107727761078_2776F-510782776 1079_2777F-510792777 1080_2777F-510802777 1081_2777F-510812777 1082_2778F-5108227781083_2778F-510832778 1084_2779F-510842779 1085_2779F-510852779 1537_2959F-515372959SD 1538_2959F-515382959SD1539_2959F-515392959SD 1540_2959F-515402959SD 1541_1542F-515411542SD 1543_2960F-515432960SID 104DSD 1544_2961F-515442961SD1545_2961F-515452961SD 1546_2961F-515462961SD 1547_2962F-515472962SD 1548_2962F-515482962SD 1549_2963F-5154929631550_2963F-515502963 1551_2963F-515512963 1552_2963F-515522963 1553_2963F-515532963 1554_2963F-5155429632088_3109F-520883109 2089_3109F-520893109 2090_2091F-520902091 2091_3109F-520913109 2092_3109F-5209231092093_3109F-520933109 2094_3109F-520943109 2095_3109F-520953109 2096_3110F-520963110SD 2097_2098F-520972098SD2098_3110F-520983110SD 2099_3110F-520993110SD 2100_3110F-521003110SD 2101_3111F-521013111SD 2101_2101F-521022101SD2103_2104F-521032104SD 2104_3111F-521043111SD 2105_3111F-521053111SD 2106_3111F-521063111SD 2107_2101F-521072101SD2108_2109F-521082109SD 2109_3112F-521093112SD 2110_3112F-521103112SD 2111_2110F-521112110SD 2112_3113F-521123113SD2113_2114F-521132114SD 2114_3113F-521143113SD 2115_2114F-521152114SD 2116_2117F-521162117SD 2117_3113F-521173113SD2118_3113F-521183113SD 2119_3114F-521193114SD 2120_2121F-521202121SD 2121_3114F-521213114SD 2122_2121F-521222121SD2123_2127F-521232127SD 2123_2124F-521232124SD 2124_3114F-521243114SD 2125_3114F-521253114SD 2127_3115F-521273115SD2128_2127F-521282127SD 2129_2130F-521292130SD 2130_3115F-521303115SD 2131_2130F-521312130SD 2132_2133F-521322133SD2133_3115F-521333115SD 2134_2135F-521342135SD 2135_3115F-521353115SD 2136_3116F-521363116SD 2137_3116F-521373116SD2138_2139F-521382139SD 2139_3116F-521393116SD 2140_2139F-521402139SD 2141_3116F-521413116SD 2142_3117F-521423117SD2143_3117F-521433117SD 2144_3117F-521443117SD 2145_2144F-521452144SD 2146_3117F-521463117SD 2147_3118F-521473118SD2148_3118F-521483118SD 2149_2150F-521492150SD 2150_3119F-521503119SD 2151_3119F-521513119SD 2152_3119F-521523119SD2153_2152F-521532152SD 2154_2155F-521542155SD 2155_3119F-521553119SD 2156_2155F-521562155SD 2157_2158F-521572158SID 104DSD2158_3120F-521583120SID 104DSD 2159_2158F-521592158SID 104DSD 2160_2161F-521602161SID 104DSD 2161_3120F-521613120SID 104DSD 2162_2161F-521622161SID 104DSD2163_2164F-521632164SID 104DSD 2164_3120F-521643120SID 104DSD 2165_3120F-521653120SID 104DSD 2166_2165F-521662165SD 2167_2168F-521672168SD2168_3121F-521683121SD 2169_3121F-521693121SD 2170_3121F-521703121SD 2171_2170F-521712170SDC 2770_2769F-5277027692771_2769F-527712769 2772_2769F-527722769 2773_2769F-527732769 11S552778_2777F-527782777SID 551912DSDCVCP8 4.33 2S992957_3058F-529573058SID 99DSDC84083.461S752958_3104F-529583104SID 751914DSDCVCP84072.51 2960_1143F-529601143SID 104DSDC123720.8 1S993038_2957F-530382957SID 99DSDC81402.2 3S993058_3060F-530583060SID 99DSDC9360 4S993060_3061F-530603061SID 99DSDC93605S993061_3064F-530613064SID 99DSDC10360 6S993064_3065F-530643065SID 99DSDC10360 7S993065_3069F-530653069SID 99DSDC12360 8S993069_3109F-530693109SID 99DSDC12314 2S753104_3105F-531043105SID 751914DSDCVCP93603.613S753105_3106F-531053106SID 751914DSDCVCP93591.05 4S753106_3107F-531063107SID 751914DSDCVCP103681.38 Page 4 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 5S753107_3108F-531073108SID 751914DSDCVCP103611.09 6S753108_3109F-531083109SID 751914DSDCVCP103591.217S753109_2963F-531092963SID 751914DSDCVCP183572.45 3110_2962F-531102962SD10 3111_3112F-531113112SD 3112_3113F-531123113SD9 3113_3114F-531133114SD93114_3115F-531143115SD9 3115_3110F-531153110SD10 3117_3116F-531173116SD10 3118_3117F-531183117SDC10 3119_3118F-531193118SD3120_2960F-531202960SID 104DSDC103560.8 8S75F-5SID 751914DSDCVCP183230.72 9S99F-5SID 99DSDC82503.9 25S552769_2768F-5/627692768SID 551912DSDCVCP123601.5 18S552774_2769F-5/627742769SID 551912DSDCVCP103601.2117S552775_2774F-5/627752774SID 551912DSDCVCP103600.71 16S552776_2775F-5/627762775SID 551912DSDCVCP103601.67 15S552777_2776F-5/627772776SID 551912DSDCVCP83602.55 7S552779_2778F-5/627792778SID 551912DSDCVCP84081.23 2S552780_2779F-5/627802779SID 551912DSDCVCP63901.432S55F-5/6SID 551912DSDCVCP12 1086_2780F-610862780 1087_2780F-610872780 1088_2780F-610882780 1089_1088F-6108910881090_1088F-610901088 1091_2780F-610912780 1092_1091F-610921091 20S3201093_2781F-610932781SID 3201938D 18S3201094_2781F-610942781SID 3201938D19S3201095_2781F-610952781SID 3201938D 14S3201096_2782F-610962782SID 3201938DSDC6 7S3201097_3542F-610973542SID 3201938DSDC6 8S3201098_2783F-610982783SID 3201938DSDC6 1099_2784F-610992784SD1100_2784F-611002784SD 1101_2784F-611012784SD 1102_2785F-611022785SD 1103_2785F-611032785SD 1104_2785F-611042785SD1531_2957F-615312957 1532_2957F-615322957 1791_3038F-617913038 1792_1791F-617921791 1793_3038F-6179330381794_3038F-617943038 1795_1794F-617951794 1796_3038F-617963038 2021_3090F-620213090SD 2022_3091F-620223091SD2023_3092F-620233092SD 2024_3092F-620243092SD 2025_3093F-620253093SD 2026_3093F-620263093SD 2027_2028F-620272028SD12S2272028_3094F-620283094SD 2029_3095F-620293095SD 2030_3095F-620303095SD 2047_3103F-620473103SD 2048_3103F-620483103SD2567_2021F-625672021SD 2781_3095F-627813095SD18 17S3202782_2781F-627822781SID 3201938DSDC20 11S3202783_2782F-627832782SID 3201938DSDC10 3S4282786_2787F-627862787SID 428DSDCRCP151781S4282787_3543F-627873543SID 428DSDCRCP15112 10S2273040_3094F-630403094SD18 3090_3091F-630903091SD10 3091_3092F-630913092SD 3092_3093F-630923093SD103093_3094F-630933094SD 5S4493097_3096F-630973096SID 449RDSDCRCP18181 6S4493098_3097F-630983097SID 449RDSDCRCP15300 4S4493099_3100F-630993100SID 449RDSDCRCP15260 3S4493100_3102F-631003102SID 449RDSDCRCP152601S4493101_3096F-631013096SID 449RDSDCRCP18158 2S4493102_3101F-631023101SID 449RDSDCRCP15402 3116_2961F-631162961SD 10S320F-6SID 3201938DSDC6 13S320F-6SID 3201938DSDC615S320F-6SID 3201938DSDC6 16S320F-6SID 3201938DSDC6 21S320F-6SID 3201938D 2S455F-6SID 455RDSDCRCP15361 7S449F-6SID 449RDSDCRCP211528S449F-6SID 449RDSDCWSP2046 9S320F-6SID 3201938DSDC6 9S449F-6SID 449RDSDCWSP2018 1108_2788F-711082788SD 1412_2912F-714122912SD1416_1417F-714161417SD 1419_1418F-714191418SD 2569_2568F-725692568SD 2570_3330F-725703330SD 2571_3331F-725713331SID 512DSD2572_3331F-725723331SID 512DSD 2573_3333F-725733333SD 2574_3333F-725743333SD 2575_3334F-725753334SID 512DSD 2576_3334F-725763334SID 512DSD2577_3335F-725773335SID 512DSD 2578_3335F-725783335SID 512DSD 2579_3336F-725793336SID 512DSD 2580_3336F-725803336SID 512DSD 2581_3337F-725813337SID 512DSD2582_3337F-725823337SID 512DSD 2583_3338F-725833338SD 2584_3338F-725843338SD 2585_2586F-725852586SD 2590_3340F-725903340SID 4631966SD 182591_3340F-725913340SID 4631966SD 25 2592_3342F-725923342SID 4631966SD 15 2593_3342F-725933342SID 4631966SD 25 2594_3343F-725943343SID 4631966SD 30 2595_3344F-725953334SID 4631966SD 422596_3344F-725963334SID 4631966SD 30 2912_2788F-729122788SD 2S4342914_2915F-729142915SID 434DSDCRCP1885 3330_3333F-733303333SD 3331_3334F-733313334SID 512DSD3332_3331F-733323331SD21 3333_3332F-733333332SD 3334_3335F-733343335SID 512DSD21 3344_3340F-733343340SID 4631966DSDCRCP15264 3335_3336F-733353336SID 512DSD243337_3335F-733373335SID 512DSD18 1S4343339_2914F-733392914SID 434DSDCRCP15193 3342_3341F-733423341SID 4631966DSD 110 3343_3342F-733433342SID 4631966DSD 134 3S434F-7SID 434D2S5311306_2870F-813062870SID 5311973SDCRCP1227 1S5311307_2870F-813072870SID 5311973SDCRCP1225 2600_2601F-826002601SD 3S5312870_3283F-828703283SID 5311973RDSDCRCP1561 4S531F-8SID 5311973RDSDCRCP15510.41245_2837F-912452837SDCRCP12 1246_2838F-912462838SDCRCP12 4WMP22674_2673F-926742673WMS, Ph 12002RD 30 2WMP2F-9WMS, Ph 12002RD 1159_1158G-011591158SD151160_1161G-011601161SD15 1163_1162G-111631162SD18 1166_2806G-111662806SD 1167_2806G-111672806SD 1170_1171G-111701171SD1171_2809G-111712809SD 2806_2807G-128062807SD15 1174_1173G-211741173SD3150 1191_2813G-211912813 1192_2813G-2119228131193_2816G-211932816SD 6WM1194_2818G-211942818WAL1993DSDCRCP12400.4 10WM1195_1196G-211951196WAL1993DSDCHDPE211450.4 9WM2819_1195G-228191195WAL1993DSDCHDPE211750.4 11WM1196_2820G-211962820WAL1993DSDCHDPE211070.415WM1199_1197G-211991197WAL1993DSDARCP13.5221620.5 1219_1220G-212191220SD 1226_2831G-212262831SID 535, 536DSDCRCP1265 5EAI2716_2715G-227162715EAI2002RDSDCRCP12380.55 7EAI2717_2718G-227172718EAI2002RDSDCRCP12380.552813_2815G-228132815SD 2814_2813G-228142813SD Page 5 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 2815_2821G-228152821SDARCP3151 2816_2814G-228162814SDARCP31512817_2816G-228172816SDARCP3151 7WM2818_2819G-228182819WAL1993DSDCRCP18760.4 2829_2830G-228292830SD 2831_2817G-228312817SDARCP3151 12WMG-2WAL1993DSDCRCP21881.2313WMG-2WAL1993DCGVCONC483300.5 14WMG-2WAL1993DCGVCONC725100.5 16WMG-2WAL1993DSDCRCP21374.49 17WMG-2WAL1993DSDCRCP24550.69 18WMG-2WAL1993DSDCPVC129019WMG-2WAL1993DSDCPVC1025 1EAIG-2EAI2002RDCULARCP3658.5132 2EAIG-2EAI2002RDCULCRCP2470 3EAIG-2EAI2002RD 4EAIG-2EAI2002RDSDCRCP12330.54WMG-2WAL1993DSDCPVC810 5WMG-2WAL1993DSDCHDPE81620.4 6EAIG-2EAI2002RDSDCRCP12270.5 8EAIG-2EAI2002RDSDCRCP18120 8WMG-2WAL1993DSDCHDPE15202830_2831G-2/328302831SID 536SD30 1203_2822G-312032822SID 535, 536SDCRCP1218 1204_2822G-312042822SID 535, 536SDCRCP1230 1205_2823G-312052823SID 535, 536SDCRCP1240 1206_2823G-312062823SID 535, 536SDCRCP12651207_2823G-312072823SID 535, 536SDCRCP1238 1210_2824G-312102824SD 1211_2824G-312112824SD 1213_2824G-312132824SD 1214_2824G-312142824SD1215_2826G-312152826SD 1216_2827G-312162827SD 1217_2827G-312172827SD 1218_2828G-312182828SD 1222_1221G-312221221CUL1389_2900G-313892900SD 1390_2900G-313902900SD 1391_2900G-313912900SD 1392_2901G-313922901SD 1393_2901G-313932901SD1394_2901G-313942901SD 1395_2901G-313952901SD 1396_2901G-313962901SD 1397_2902G-313972902SD 1398_2902G-313982902SD1399_2903G-313992903SD 2823_2822G-328232822SID 535SDC42 2824_1212G-328241212SD 2826_2827G-328262827SD12 2827_2828G-328272828SD122900_2901G-3/429002901SID 408SDC27 2901_2825G-3/429012825SID 408SDC30 2902_2901G-3/429022901SID 408SDC15 2903_2902G-3/429032902SID 408SDC15 1279_2856G-412792856SD1282_2856G-412822856SD 1283_2856G-412832856SD 1285_2859G-412852859SD 1286_2860G-412862860SD 1287_1286G-412871286SD1291_2864G-412912864SD 1292_2864G-412922864SD 1293_2865G-412932865SD 1294_2865G-412942865SD 1354_2889G-413542889SD1555_2964G-415552964SD 1556_2964G-415562964SD 1557_2964G-415572964SD 1574_2968G-415742968SD 1575_2968G-415752968SD1576_2969G-415762969SD 2271_3155G-422713155SD 2272_3155G-422723155SD 2273_3156G-422733156SD 2274_3156G-422743156SD2277_3158G-422773158SD 2278_3158G-422783158SD 2279_3159G-422793159SD 2280_3160G-422803160SD 2281_3161G-422813161SD2282_3161G-422823161SD 2283_3162G-422833162SD 2284_3162G-422843162SD 2285_3163G-422853163SD 2286_3164G-422863164SD2287_3164G-422873164SD 2288_3165G-422883165SID 433DSD 2289_3166G-422893166SD 2290_3167G-422903167SD 2291_3167G-422913167SD2292_3168G-422923168SD 2293_3169G-422933169SD 2294_3169G-422943169SD 2295_3170G-422953170SD 2296_3170G-422963170SD2297_3172G-422973172SID 427DSD 2298_3172G-422983172SID 427DSD 2300_3173G-423003173SID 433DSD 2301_3174G-423013174SID 427DSD 2302_3174G-423023174SID 427DSD2304_2303G-423042303SD 2305_3175G-423053175SD 2306_3175G-423063175SD 2307_3176G-423073176SD 2850_2851G-428502851SD152851_2856G-428512856SD 2853_2856G-428532856SD 2856_2865G-428562865SDRCP24 2859_2853G-428592853SDRCP12 2864_3176G-428643176SD2865_3169G-428653169SD 2964_2845G-429642845SD18 2968_2853G-429682853SDRCP18 2969_2859G-429692859SDRCP12 2971_2860G-429712860SD423155_3156G-431553156SDRCP18 3156_3157G-431563157SDRCP21 3157_2900G-431572900SDRCP21 3159_2901G-431592901SDRCP15 3160_3156G-431603156SDRCP153161_3160G-431613160SD 3162_3161G-431623161SDRCP15 3163_3162G-431633162SD 3164_2903G-431642903SD 1S4333165_3173G-431653173SID 433DSDCRCP151553166_3171G-431663171SDRCP15 3167_3166G-431673166SD 3168_3167G-431683167SD 3169_3170G-431693170SDRCP27 3170_3171G-431703171SD3171_3172G-431713172SDRCP30 2S4333172_3173G-431723173SID 433DSDCRCP12165 1S4273174_3172G-431743172SID 427DSDCRCP15333 3175_3171G-431753171SDRCP15 3176_3175G-431763175SDRCP158S981262_2846G-4/512622846SID 981915D 9S981263_2846G-4/512632846SID 981915D 13S981264_2846G-4/512642846SID 981915D 60S981265_2846G-4/512652846SID 981915D 51S3531267_2847G-4/512672847SID 353D52S3531268_2847G-4/512682847SID 353D 44S3531269_2848G-4/512692848SID 353D 45S3531270_1269G-4/512701269SID 353D 46S3531271_1269G-4/512711269SID 353D 48S3531272_2848G-4/512722848SID 353D47S3531273_1272G-4/512731272SID 353D 25S981277_2850G-4/512772850SID 981915D 24S981278_2850G-4/512782850SID 981915D 55S3531432_2921G-4/514322921SID 353D 56S3531433_1432G-4/514331432SID 353D58S3531434_1435G-4/514341435SID 353D 57S3531435_2921G-4/514352921SID 353D 59S3531436_1435G-4/514361435SID 353D 60S3531437_2921G-4/514372921SID 353D 61S3531438_2921G-4/514382921SID 353D62S3531439_2921G-4/514392921SID 353D 10S3531440_2922G-4/514402922SID 353D 11S3531441_2922G-4/514412922SID 353D 9S3531442_2922G-4/514422922SID 353D 4S3531443_2922G-4/514432922SID 353D5S3531444_1443G-4/514441443SID 353D 6S3531445_1446G-4/514451446SID 353D Page 6 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 7S3531446_2922G-4/514462922SID 353D 8S3531447_2922G-4/514472922SID 353D47S981448_2923G-4/514481449SID 981915D 50S981449_1448G-4/514491448SID 981915D 51S981450_1451G-4/514501451SID 981915D 52S981452_2923G-4/514522923SID 981915D 53S981453_2923G-4/514532923SID 981915D48S981455_2923G-4/514552923SID 981915D 35S981567_2967G-4/515672967SID 981915D 62S981568_2967G-4/515682967SID 981915D 40S981569_2967G-4/515692967SID 981915D 41S981570_2967G-4/515702967SID 981915D42S981571_1572G-4/515711572SID 981915D 37S981572_2967G-4/515722967SID 981915D 38S981573_2967G-4/515732967SID 981915D 19S3531994_3078G-4/519943078SID 353D 20S3531995_3078G-4/519953078SID 353D21S3531996_3078G-4/519963078SID 353D 30S3531997_3079G-4/519973079SID 353D 31S3531998_3079G-4/519983079SID 353D 32S3531999_3079G-4/519993079SID 353D 66S3532000_3079G-4/520003079SID 353D14S3532001_3080G-4/520013080SID 353D 15S3532002_3080G-4/520023080SID 353D 16S3532003_3080G-4/520033080SID 353D 17S3532004_3080G-4/520043080SID 353D 16S982847_2848G-4/528472848SID 981915DSDC8831.58443S3532848_2849G-4/528482849SID 353DC10 23S982849_2850G-4/528492850SID 981915DSDC10861.584 43S982921_2967G-4/529212967SID 981915DSDC103891.595 64S3532922_2921G-4/529222921SID 353DC10 45S982923_2922G-4/529232922SID 981915DSDC103601.44455S982924_2923G-4/529242923SID 981915DSDC103601.72 33S982967_2850G-4/529672850SID 981915DSDC12 33S3533079_2921G-4/530792921SID 353DC8 13S3533080_2922G-4/530802922SID 353DSDC15 10S98G-4/5SID 981915D11S98G-4/5SID 981915D 12S353G-4/5SID 353D 12S98G-4/5SID 981915D 14S98G-4/5SID 981915D 15S98G-4/5SID 981915DSDC86070.56517S98G-4/5SID 981915DSDC102491.584 18S353G-4/5SID 353D 18S98G-4/5SID 981915D 19S98G-4/5SID 981915D 20S98G-4/5SID 981915D21S98G-4/5SID 981915D 22S353G-4/5SID 353DSDC10 22S98G-4/5SID 981915D 26S98G-4/5SID 981915D 27S98G-4/5SID 981915D28S98G-4/5SID 981915D 29S98G-4/5SID 981915D 30S98G-4/5SID 981915DSDC15 0.8 34S353G-4/5SID 353DC10 34S98G-4/5SID 981915D35S353G-4/5SID 353D 36S353G-4/5SID 353D 36S98G-4/5SID 981915D 37S353G-4/5SID 353D 38S353G-4/5SID 353D39S353G-4/5SID 353D 40S353G-4/5SID 353D 41S353G-4/5SID 353D 42S353G-4/5SID 353D 44S98G-4/5SID 981915DSDC103580.75446S98G-4/5SID 981915D 49S353G-4/5SID 353D 49S98G-4/5SID 981915D 50S353G-4/5SID 353D 53S353G-4/5SID 353D54S981454_2923G-4/5SID 981915D 63S353G-4/5SID 353D 65S353G-4/5SID 353DSDC15 67S353G-4/5SID 353DC8 1469_2926G-514692926SD1470_1469G-514701469SD 1471_1472G-514711472SD 1472_2926G-514722926SD 1473_1472G-514731472SD 1474_2926G-514742926SD1475_2926G-514752926SD 1476_1475G-514761475SD 1477_1475G-514771475SD 1478_1479G-514781479SD 1479_2926G-514792926SD11S3051527_2956G-515272956SID 3051937DSDC8 8S3051529_2956G-515292956SID 3051937DSDC8 9S3051530_2956G-515302956SID 3051937DSDC8 1558_2965G-515582965SD 1559_2965G-515592965SD1561_2965G-515612965SD 1562_2965G-515622965SD 1562_2965G-515622965SD 8S2081563_2966G-515632966SID 2081920DSDC6 9S2081564_2966G-515642966SID 2081920DSDC61881_3059G-518813059SD 1882_3059G-518823059SD 1883_3059G-518833059SD 1884_3059G-518843059SD 1896_3062G-518963062SD1897_3062G-518973062SD 1898_3062G-518983062SD 1899_3062G-518993062SD 1900_1907G-519001907SD 1901_1902G-519011902SD1902_3063G-519023063SD 1903_1902G-519031902SD 1904_1905G-519041905SD 1905_3063G-519053063SD 1906_3063G-519063063SD1907_3063G-519073063SD 23S1451920_1921G-519201921SID 1451916DSDC6 19S1451921_3066G-519213066SID 1451916DSDC6 24S1451922_3066G-519223066SID 1451916DSDC6 20S1451923_3066G-519233066SID 1451916DSDC626S1451924_3066G-519243066SID 1451916DSDC10 27S1451925_3066G-519253066SID 1451916DSDC10 21S1451926_3066G-519263066SID 1451916DSDC6 28S1451927_1926G-519271926SID 1451916DSDC6 22S1451928_3066G-519283066SID 1451916DSDC629S1451929_1928G-519291928SID 1451916DSDC6 1932_3068G-519323068SD 1933_3068G-519333068SD 1934_3068G-519343068SD 1935_1936G-519351936SD1936_3068G-519363068SD 1937_3068G-519373068SD 1938_1937G-519381937SD 1939_3068G-519393068SD 1940_3068G-519403068SD1941_3068G-519413068SD 15S3051947_3070G-519473070SID 3051937DSDC6 16S3051948_3070G-519483070SID 3051937DSDC6 17S3051949_3070G-519493070SID 3051937DSDC6 18S3051950_3070G-519503070SID 3051937DSDC613S3051951_3070G-519513070SID 3051937DSDC8 32S1801952_3071G-519523071SID 1801919DSDC616 33S1801953_1952G-519531952SID 1801919DSDC622 35S1801954_1955G-519541955SID 1801919DSDC622 34S1801955_3071G-519553071SID 1801919DSDC62436S1801956_1955G-519561955SID 1801919DSDC622 37S1801957_3071G-519573071SID 1801919DSDC622 31S1801958_3071G-519583071SID 1801919DSDC616 24S1801959_1966G-519591966SID 1801919DSDC622 26S1801960_1961G-519601961SID 1801919DSDC62225S1801961_3072G-519613072SID 1801919DSDC624 27S1801962_1961G-519621961SID 1801919DSDC622 28S1801963_1964G-519631964SID 1801919DSDC622 29S1801964_3072G-519643072SID 1801919DSDC624 22S1801965_3072G-519653072SID 1801919DSDC61623S1801966_3072G-519663072SID 1801919DSDC616 30S3051967_3073G-519673073SID 3051937DSDC6 24S3051968_3073G-519683073SID 3051937DSDC8 20S3051969_3073G-519693073SID 3051937DSDC6 26S3051970_3074G-519703074SID 3051937D29S3051971_3074G-519713074SID 3051937D 28S3051972_3074G-519723074SID 3051937D 27S3051973_3074G-519733074SID 3051937D 6S1461977_3076G-519773076SID 1461917DSDC6 8S1461978_1979G-519781979SID 1461917DSDC69S1461979_3076G-519793076SID 1461917DSDC6 2S1461980_3076G-519803076SID 1461917DSDC6 Page 7 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 3S1461981_1980G-519811980SID 1461917DSDC6 7S1461982_3076G-519823076SID 1461917DSDC61S1461983_3076G-519833076SID 1461917DSDC6 8S1451984_3077G-519843077SID 1451916DSDC6 7S1451985_3077G-519853077SID 1451916DSDC6 11S1451986_1985G-519861985SID 1451916DSDC6 15S1451987_1988G-519871988SID 1451916DSDC610S1451988_3077G-519883077SID 1451916DSDC6 14S1451989_1988G-519891988SID 1451916DSDC6 31S1451990_1991G-519901991SID 1451916DSDC6 9S1451991_3077G-519913077SID 1451916DSDC6 13S1451992_1991G-519921991SID 1451916DSDC612S1451993_1984G-519931984SID 1451916DSDC6 2005_3081G-520053081SD 2006_3081G-520063081SD 2007_3082G-520073082SD 2008_3082G-520083082SD2009_3083G-520093083SD 2010_3083G-520103083SD 2011_3084G-520113084SD 2012_3085G-520123085SD 2013_3085G-520133085SD2014_3086G-520143086SD 2015_3086G-520153086SD 2016_3087G-520163087SD 2017_3087G-520173087SD 2018_3088G-520183088SD2019_3088G-520193088SD 2020_3089G-520203089SD 2926_2925G-529262925SDVCP8 2954_2926G-529542926SDVCP8 39S1802955_3071G-529553071SID 1801919DSDC10 112S3052956_3070G-529563070SID 3051937DSDC104122.428 2965_2964G-529652964SD18 3059_3073G-530593073SD 3062_3074G-530623074SD 3063_3064G-530633064SD30S1453066_3068G-530663068SID 1451916DSDC183490.5 3068_3065G-530683065SD 19S3053070_3073G-530703073SID 3051937DSDC123572.778 30S1803071_3072G-530713072SID 1801919DSDC10 2.5 21S1803072_3075G-530723075SID 1801919DSDC10 2.225S3053073_3074G-530733074SID 3051937DSDC123572.119 31S3053074_3076G-530743076SID 3051937DSDC15 16S1453077_3066G-530773066SID 1451916DSDC153960.5 3081_2968G-530812968SDRCP18 3082_3081G-530823081SDRCP153084_2882G-530842882SDRCP15 3085_2883G-530852883SDRCP15 3086_3087G-530863087SDRCP15 3087_3088G-530873088SD 3088_3089G-530883089SDRCP153089_3081G-530893081SDRCP15 10S146G-5SID 1461917DSDC15 0.574 10S208G-5SID 2081920DSDC6 10S305G-5SID 3051937DSDC8 11S208G-5SID 2081920DSDC612S208G-5SID 2081920DSDC6 13S180G-5SID 1801919DSDC616 13S208G-5SID 2081920DSDCVCP10 1 14S180G-5SID 1801919DSDC616 14S208G-5SID 2081920DSDC614S305G-5SID 3051937DSDC8 15S180G-5SID 1801919DSDC622 16S180G-5SID 1801919DSDC622 17S145G-5SID 1451916DSDC6 17S180G-5SID 1801919DSDC62218S145G-5SID 1451916DSDC6 18S180G-5SID 1801919DSDC624 19S180G-5SID 1801919DSDC622 20S180G-5SID 1801919DSDC624 21S305G-5SID 3051937DSDC622S305G-5SID 3051937DSDC6 23S305G-5SID 3051937DSDC8 25S145G-5SID 1451916DSDC10 38S180G-5SID 1801919DSDC624 40S180G-5SID 1801919DSDC61641S180G-5SID 1801919DSDC622 42S180G-5SID 1801919DSDC816 43S180G-5SID 1801919DSDC822 44S180G-5SID 1801919DSDC822 45S180G-5SID 1801919DSDC82446S180G-5SID 1801919DSDC822 47S180G-5SID 1801919DSDC822 48S180G-5SID 1801919DSDC822 49S180G-5SID 1801919DSDC824 4S145G-5SID 1451916DSDC64S146G-5SID 1461917DSDC6 50S180G-5SID 1801919DSDC15 0.6 5S145G-5SID 1451916DSDC6 6S145G-5SID 1451916DSDC101870.5 6S208G-5SID 2081920DSDC67S208G-5SID 2081920DSDC6 19S851456_2924G-5/614562924SID 851915DSDC645 23S851457_2924G-5/614572924SID 851915DSDC6 22S851458_2924G-5/614582924SID 851915DSDC6 21S851459_2924G-5/614592924SID 851915DSDC617S851460_2924G-5/614602924SID 851915DSDC625 20S851461_1460G-5/614611460SID 851915DSDC6 26S851462_2925G-5/614622925SID 851915DSDC621 27S851463_2925G-5/614632925SID 851915DSDC621 28S851464_1463G-5/614641463SID 851915DSDC629S851465_2925G-5/614652925SID 851915DSDC6 30S851466_2925G-5/614662925SID 851915DSDC6 32S851467_2925G-5/614672925SID 851915DSDC6 34S851468_2925G-5/614682925SID 851915DSDC645 41S851520_2954G-5/615202954SID 851915DSDC640S851521_2954G-5/615212954SID 851915DSDC6 39S851522_2954G-5/615222954SID 851915DSDC6 11S2931858_3055G-5/618583055SID 2931935D 10S2931859_3055G-5/618593055SID 2931935D 9S2931860_3055G-5/618603055SID 2931935D8S2931861_3055G-5/618613055SID 2931935D 6S2931862_3055G-5/618623055SID 2931935D 1S2931863_3056G-5/618633056SID 2931935D 2S2931864_3056G-5/618643056SID 2931935D 3S2931866_3056G-5/618663056SID 2931935D48S851867_3057G-5/618673057SID 851915DSDC6 50S851868_3057G-5/618683057SID 851915DSDC6 52S851869_3057G-5/618693057SID 851915DSDC6 47S851870_1871G-5/618701871SID 851915DSDC6 56S851871_3057G-5/618713057SID 851915DSDC62225S852925_2924G-5/629252924SID 851915DSDCVCP103602.72 12S2393055_2955G-5/630552955SID 2931935DSDC8 4.151 5S2933056_3055G-5/630563055SID 2931935DSDC8 0.738 45S853057_2954G-5/630572954SID 851915DSDC645 16S85G-5/6SID 851915DSDC62518S239G-5/6SID 2931935D 18S85G-5/6SID 851915DSDC645 23S239G-5/6SID 2931935D 24S239G-5/6SID 2931935D 24S85G-5/6SID 851915DSDC625S239G-5/6SID 2931935D 31S85G-5/6SID 851915DSDC645 33S85G-5/6SID 851915DSDC6 35S85G-5/6SID 851915DSDCVCP8 36S85G-5/6SID 851915DSDCVCP84162.6537S85G-5/6SID 851915DSDC620 38S85G-5/6SID 851915DSDC620 42S85G-5/6SID 851915DSDC6 43S85G-5/6SID 851915DSDC645 44S85G-5/6SID 851915DSDC646S85G-5/6SID 851915DSDCVCP83902.05 49S85G-5/6SID 851915DSDC6 4S239G-5/6SID 2931935D 51S85G-5/6SID 851915DSDC635 53S85G-5/6SID 851915DSDC654S85G-5/6SID 851915DSDC6 55S85G-5/6SID 851915DSDC645 7S239G-5/6SID 2931935D 1405_1404G-614051404SDC1234 21S2931523_2955G-615232955SID 2931935D20S2931524_2955G-615242955SID 2931935D 22S2931525_2955G-615252955SID 2931935D 19S2931526_2955G-615262955SID 2931935D 21S2281797_3039G-617973039SID 228D 20S2281798_3039G-617983039SID 228D23S2281799_1800G-617991800SID 228D 22S2281800_3039G-618003039SID 228D 13S2281801_3040G-618013040SID 228D 18S2281802_1801G-618021801SID 228D 12S2281803_3040G-618033040SID 228D15S2281804_1803G-618041803SID 228D 16S2281805_1806G-618051806SID 228D Page 8 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 14S2281806_3040G-618063040SID 228D 17S2281807_1806G-618071806SID 228D3S2281810_3042G-618103042SID 228D 1S2281811_3042G-618113042SID 228D 2S2281812_3042G-618123042SID 228D 4S2281813_3042G-618133042SID 228D 8S2281814_1813G-618141813SID 228D6S2281815_1813G-618151813SID 228D 5S2281816_1812G-618161812SID 228D 1817_3043G-618173043SID 371SD 1818_3043G-618183043 1819_3043G-6181930431820_3043G-618203043 1821_3044G-618213044SD 1822_3044G-618223044SD 1823_3044G-618233044SD 1824_3044G-618243044SD1825_3045G-618253045SD 1826_3045G-618263045SD 1827_3045G-618273045SD 1828_3045G-618283045SD 43S2391829_3046G-618293046SID 293D45S2391830_3046G-618303046SID 293D 49S2391831_30416G-618313046SID 293D 39S2391832_3047G-618323047SID 293D 40S2391833_3047G-618333047SID 293D 41S2393046_3047G-618333047SID 293D1834_3048G-618343048SD 1835_3048G-618353048SD 1836_3048G-618363048SD 1837_3048G-618373048SD 1838_3049G-618383049SD1839_3049G-618393049SD 1840_3049G-618403049SD 27S2391846_3050G-618463050SID 293D 28S2391847_3050G-618473050SID 293D 29S2391848_1847G-618481847SID 293D19S2391849_3051G-618493051SID 293D 21S2391850_3052G-618503052SID 293D 17S2391851_3052G-618513052SID 293D 1854_3054G-618543054SD 1855_3054G-618553054SD1856_3054G-618563054SD 1857_3054G-618573054SD 41S2931865_3056G-618653056SID 2931935DSDC103600.3972 19S2283039_3040G-630393040SID 228DSDC103680.5 10S2283042_3040G-630423040SID 228DSDC103601.473043_3042G-630433042SD10 3044_3043G-630443043SD 3045_3048G-630453048SD 35S2393047_3050G-630473050SID 239DSDC123600.3972 3048_3049G-630483049SD103049_3053G-630493053SD10 26S2393050_3051G-630503051SID 239DSDC122480.3972 22S2393051_3052G-630513052SID 239DSDC151120.3972 3053_3052G-630533052 3054_3058G-630543058SD11S228G-6SID 228D 16S239G-6SID 239D 18S239G-6SID 239D 20S239G-6SID 239D 23S239G-6SID 239D24S239G-6SID 239D 25S239G-6SID 239D 30S239G-6SID 239D 31S239G-6SID 239D 32S239G-6SID 239D33S239G-6SID 239D 34S239G-6SID 239D 36S239G-6SID 239D 37S239G-6SID 239D 38S239G-6SID 239D42S239G-6SID 239D 44S239G-6SID 239D 46S239G-6SID 239D 47S239G-6SID 239D 48S239G-6SID 239D9S228G-6SID 228D 2445_3275G-724453275SD 2446_3275G-724463275SD 2447_3278G-724473278SD 2449_3279G-724493279SD3275_3276G-732753276SD 3276_3277G-732763277SDRCP15 3277_3278G-732773278SD 1S447G-7SID 447RDSDCRCP15360 3S447G-7SID 447RDSDCRCP151554S447G-7SID 447RD 5S447G-7SID 447RD 6S447G-7SID 447RD 2450_3280G-824503280SD 2451_3280G-824513280SD 202452_3280G-824523280SD 36 2453_3281G-824533281SD 42 2454_3282G-824543282SD 2455_3282G-824553282SD 42 2456_3285G-824563285SD2457_3285G-824573285SD 2458_3285G-824583285SD 2459_3287G-824593287SD 2460_3287G-824603287SD 2461_3288G-824613288SD2462_2464G-824622464SD 2463_2462G-824632462SD12 3281_3280G-832813280SDRCP30 3282_3281G-832823281SD 3283_3282G-832833282SD3284_3283G-832843283SD 42 3285_3283G-832853283SD 3286_3287G-832863287SDRCP30 3287_3288G-832873288SD 3288_3285G-832883285SD1241_1242H-312411242SD12 1242_1244H-312421244SD 1243_2997H-312432997SD66 1244_1243H-312441243SD66 1692_2690H-316902991SD1690_2991H-316902991SD 1691_2994H-316912994SD 1693_1691H-316931691SD12 1694_2994H-316942994SD 1695_2996H-316952996SD121696_1695H-316961695SD 4BSD1697_2999H-316972999BSD1994RD 10 3BSD1698_2999H-316982999BSD1994RD 20 2615_2616H-326152616SD12 2616_2997H-326162997SD1BSD2835_1243H-328351243BSD1994RDSDCCMP182820.706 2836_1244H-328361244SD66 2991_2992H-329912992SD60 2992_2993H-329922993SD 2994_1692H-329941692SD2995_2994H-329952994SD66 2996_2995H-329962995SD66 2997_2996H-329972996SD66 2BSD2999_2835H-329992835BSD1994RDSDCRCP15247 3372_2836H-333722836SD55734S4442932_2998H-3/429322998SID 444RDSDCRCP15318 5S4442998_3000H-3/429983000SID 444RDSDCRCP15218 6S4443000_2999H-3/430002999SID 444RDSDCRCP15464 2S4443006_3007H-3/430063007SID 444RDSDCRCP12440 3S4443007_2932H-3/430072932SID 444RDSDCRCP124301S4443008_3006H-3/430083006SID 444RDSDCRCP12443 1288_2861H-412882861SD 1289_2861H-412892861SD 1290_2861H-412902861SD 1310_2871H-413102871SD1318_2874H-413182874SD 1482_1481H-414821481SD 1484_2930H-414842930SID 4691966DSDCRCP1230 1485_2930H-414852930SID 4691966DSDCRCP1230 1488_2931H-414882931SID 547DSD1489_2931H-414892931SID 547DSD 1700_3001H-417003001CCCMP15 1703_3002H-417033002SID 4691966DSDCRCP1218 1704_3002H-417043002SID 4691966DSDCRCP1536 1705_3002H-417053002SID 4691966DSDCRCP12401708_3008H-417083008SID 444DSD 2341_2972H-423412972SD 2930_2929H-429302929SID 4691966DSD 2931_2930H-429312930SID 547DSDC15 3002_3004H-430023004SID 4691966DSDCRCP213004_3005H-430043005SID 4691966DSDCRCP21 3005_2930H-430052930SID 4691966DSDCRCP21 Page 9 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 1338_1339H-513381339SD 1339_2879H-513392879SD1340_2882H-513402882SD 1341_2882H-513412882SD 1342_2883H-513422883SD 1343_2883H-513432883SD 1344_2884H-513442884SD1346_2885H-513462885SD 1347_2885H-513472885SD 1348_2886H-513482886SD 1349_2886H-513492886SD 1352_2888H-513522888SD1353_2888H-513532888SD 1577_2970H-515772970SD 1578_3192H-515783192SD 2309_3178H-523093178SD 2310_3179H-523103179SD2311_3179H-523113179SD 2312_3180H-523123180SD 2313_3180H-523133180SD 2314_3181H-523143181SD 2315_3181H-523153181SD2316_3182H-523163182SD 2317_3182H-523173182SD 2318_3183H-523183183SD 2319_3183H-523193183SD 2320_3184H-523203184SD2321_3184H-523213184SD 2322_3185H-523223185SD 2323_3185H-523233185SD 2324_3186H-523243286SD 2325_3186H-523253186SD2326_3187H-523263187SD 2327_3187H-523273187SD 2328_3187H-523283187SD 2329_3188H-523293188SD 2330_3188H-523303188SD2331_3188H-523313188SD 2332_3189H-523323189SD 2332_3189H-523323189SD 2334_3189H-523343189SD 2335_2336H-523352336SD2340_2341H-523402341SD 2342_3194H-523423194SD 2343_3194H-523433194SD 2344_3198H-523443198SD 2347_2346H-523472346SD2348_2349H-523482349SD 2350_2351H-523502351SD12 2879_2881H-528792881SD18 2880_2881H-528802881SD 2881_2882H-528812882SD362882_2883H-528822883SD 2886_2887H-528832887SDCRCP42 2883_2884H-528832884SD 2884_2885H-528842885SD 2885_2886H-528852886SD362887_2888H-528872888SDCRCP42 2888_2970H-528882970SDCRCP42 2970_2971H-529702971SDCRCP42 2973_1579H-529731579SD 2974_2973H-529742973SDC243177_2880H-531772880SD36 3178_2882H-531782882SD15 3179_3180H-531793180SD15 3180_3185H-531803185SD 3181_3182H-531813182SD3182_2883H-531822883SD15 3183_2884H-531832884SD15 3184_3188H-531843188SD 3185_3187H-531853187SD 3186_3187H-531863187SD153187_3188H-531873188SD18 3188_3189H-531883189SDC21 3189_2885H-531892885SDC21 3190_3191H-531903191SD18 3191_2339H-531912339SD3192_2970H-531922970SD 3193_3194H-531933194SD 3194_3195H-531943195SD21 3195_3196H-531953196SD 3197_3198H-531973198SD3198_2974H-531982974SDC24 3198_3197H-531983197SD 3199_2351H-531992351SD15 1345_2884H-5134562884SD 1323_2876H-713232876SID 538DSDCRCP12421331_2875H-713312875SID 538DSDCRCP12 1333_2875H-713332875SID 538DSDCRCP1235 1334_1323H-713341323SID 538DSDCRCP1238 1335_2878H-713352878SD 1336_2877H-713362877SID 538DSDC121337_2878H-713372878SD 1400_2905H-714002905SDARCP1828 1402_2909H-714022909SDCRC1228 1403_2909H-714032909SDCRC1283 2875_2876H-728752876SID 538DSDCRCP242877_2875H-728772875SID 538DSDCRCP21 2904_2906H-729042906SDCRCP24 2905_2904H-729052904SDC 2906_2907H-729062907SD 2907_1401H-729071401SD242908_1401H-729081401SDCRCP21 2909_2908H-729092908SD 2491_2490I-324912490SD 7BP22493_2492I-324932492BS, Ph 21995RDSDCRCP12372 2S6492494_3295I-324943295AS, Ph 11985RDSDCRCP122813S6492495_3295I-324953295AS, Ph 11985RDSDCRCP12391 2496_3297I-324963297SID 6491985SD 2497_3297I-324973297SID 6491985SD 4S6493294_3295I-332943295AS, Ph 11985RDSDCRCP12231 5S6493295_3296I-332953296AS, Ph 11985RDSDCRCP212040.253296_3297I-332963297SID 6491985SDC21 3297_2498I-332972498SID 6491985SDC21 10BP2I-3BS, Ph 21995RDSDCRCP1215 11BP2I-3BS, Ph 21995RDSDCRCP12372 12BP2I-3BS, Ph 21995RDSDCRCP12151BP2I-3BS, Ph 21995RDCRCP24840.9 2BP2I-3BS, Ph 21995RDCULCCMP36 4CAP2I-3CA, Ph 22003RDSDCPVC24910.6 5CAP2I-3CA, Ph 22003RDSDCRCP24460.6 6CAP2I-3CA, Ph 22003RDSDCRCP18211.546S649I-3AS, Ph 11985RDSDCRCP211600.25 7CAP2I-3CA, Ph 22003RDSDCRCP15151.02 7S649I-3AS, Ph 11985RDSDCRCP21560.7 8BP2I-3BS, Ph 21995RDSDCRCP12121 8CAP2I-3CA, Ph 22003RDSDCRCP15287.259BP2I-3BS, Ph 21995RDSDCRCP12 2 9CAP2I-3CA, Ph 22003RDSDCRCP15130.83 1494_2936I-414942936SD 1495_2936I-414952936SID 520DSD 1496_2937I-414962937SID 520DSD1497_2937I-414972937SID 520DSD 2553_2552I-425532552SD 2554_2555I-425542555SD 2558_2557I-425582557SD 2559_2560I-4255925602562_3327I-425623327SID 520DSD 2563_3328I-425633328SID 520DSD 2564_3328I-425643328SID 520DSD 2565_3329I-425653329SID 520DSDCRCP126 2566_3329I-425663329SID 520DSDCRCP12652871_2872I-428712872SD 2873_3372I-428733372SD 3327_3328I-433273328SID 520DSD 1506_2943I-515062943SD1507_2943I-515072943SD 1508_2944I-515082944SD 1509_2944I-515092944SD 1510_2948I-515102948SD 1511_2948I-515112948SD1514_2950I-515142950SD 1580_2975I-515802975SID 562DSDCRCP47.8 1581_2975I-515812975SID 562DSDCRCP1255 1582_2976I-515822976SID 562DSDCRCP1217.5 1583_1582I-515831582SID 562DSDCRCP12351713_3013I-517133013SID 562DSDCRCP1253 1714_3013I-517143013SID 562DSDCRCP1240 1715_3015I-517153015SID 562DSDCRCP1228 1716_3016I-517163016SID 562DSDCRCP1223 1717_3016I-517173016SID 562DSDCRCP12121720_1724I-517201724SID 562DSDCRCP1250 1724_3019I-517243019SID 562DSDCRCP1210 Page 10 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 1726_3020I-517263020SD 1727_3020I-517273020SD1730_1731I-517301731SD 1731_1733I-517311733SD12 1732_1733I-517321733SD 1733_1737I-517331737SD15 1734_3021I-5173430211735_3021I-517353021 1736_1737I-517361737SD 1737_3022I-517373022SD 2943_2944I-529432944SDCRCP24 2944_2947I-529442947SD2947_2948I-529472948SD24 2948_2949I-529482949SD 2975_2976I-529752976SID 562DSD21 3009_3010I-530093010SD2236 3010_1723I-530101723SD27443012_3009I-530123009SD2236 3013_3014I-530133014SID 562DSD15 3014_3015I-530143015SID 562DSD15 3015_2975I-530152975SID 562DSD18 3016_3019I-530163019SID 562DSD183017_3012I-530173012SD24 3018_3547I-530183547SD 3019_1723I-530191723SD21 3020_2945I-530202945SD15 3021_3022I-5302130221111_1110I-611111110 23CCP12617_2619J-026172619CCS, Ph 12002RDSDARCP1828.5400.42 24CCP12618_2617J-026182617CCS, Ph 12002RDSDARCP13.522401.1 22CCP12619_2620J-026192620CCS, Ph 12002RDSDARCP22.536.252830.4 21CCP12620_2624J-026202624CCS, Ph 12002RDSDARCP22.536.252830.420CCP12621_2622J-026212622CCS, Ph 12002RDSDCRCP12350.4 19CCP12622_2623J-026222623CCS, Ph 12002RDSDCRCP15291.6 18CCP12623_2624J-026232624CCS, Ph 12002RDSDCRCP1870.6 9CCP12624_2627J-026242627CCS, Ph 12002RDSDARCP23.536.253200.4 10CCP12625_2624J-026252624CCS, Ph 12002RDSDCRCP122815CCP12626_3478J-026263478CCS, Ph 12002RDSDARCP22.536.25280.89 6CCP12627_2626J-026272626CCS, Ph 12002RDSDARCP23.536.25330.28 7CCP12628_2627J-026282627CCS, Ph 12002RDSDCRCP1872 26CCP12630_2629J-026302629CCS, Ph 12002RDSDARCP1828.52660.3 30CCP12631_2635J-026312635CCS, Ph 12002RDSDCRCP18401.0331CCP12632_2631J-026322631CCS, Ph 12002RDSDCRCP12351.4 32CCP12633_2635J-026332635CCS, Ph 12002RDSDCRCP18601.1 33CCP12634_2633J-026342633CCS, Ph 12002RDSDCRCP12391 28CCP12635_2630J-026352630CCS, Ph 12002RDSDCRCP181641.11 29CCP12636_2635J-026362635CCS, Ph 12002RDSDCRCP12401.2734CCP12637_3483J-026373483CCS, Ph 12002RDSDCRCP18251 35CCP12638_2637J-026382637CCS, Ph 12002RDSDCRCP18391 8CCP13479_2628J-034792628CCS, Ph 12002RDSDCRCP15563.55 25CCP13480_2629J-034802629CCS, Ph 12002RDSDARCP1828.52520.3 1CCP13482_3481J-034823481CCS, Ph 12002RDCARCP26.62543.751200.81CCP13485_3484J-034853484CCS, Ph 12002RDCARCP26.62543.751200.8 1CCP1J-0CCS, Ph 12002RDCULARCP26.62543.751200.8 3517_3516J-335173516CUL 5HCP12742_3509J-327423509HCS, Ph 11999RDSDCRCP1850 4HCP12841_2842J-328412842HCS, Ph 11999RDSDARCP13.522602843_3487J-328433487HCS, Ph 42001RDSDCRCP27990.495 2844_2843J-328442843HCS, Ph 42001RDSDCRCP27180.5 3486_2844J-334862844HCS, Ph 42001DSDCRCP27153.330.496 3487_3488J-334873488HCS, Ph 42001DSDCRCP2786.90.495 3488_3500J-334883500D3492_1255J-334921255HCS, Ph 22000RDSDC 3493_1258J-334931258HCS, Ph 22000RDSDC 3498_3497J-334983497C36 3500_3499J-335003499CA3152 3501_3488J-335013488D1HCP23502_3501J-335023501HCS, Ph 22000RDC 3503_3502J-335033502D 1HCP13504_3503J-335043503HCS, Ph 11999RDCULC 3505_3504J-335053504D 2HCP13506_3505J-335063505HCS, Ph 11999RD3HCP13508_2841J-335082841HCS, Ph 11999RDSDCRCP1860 3509_3510J-335093510D 2540_3323J-425403323SD 2541_3323J-425413323SD 2WS2543_2542J-425432542WS1996DSDARCP13.522362545_2546J-425452546SD24 2546_3513J-425463513SD 2548_3512J-425483512SD 2549_2548J-425492548SD 2550_2551J-425502551SD3325_3324J-433253324SD 3507_3506J-435073506CULCCMP18 3511_3325J-435113325SD 3515_3514J-435153514CULCCMP24 3WSJ-4WS1996DSDARCP13.522291500_2940J-515002940SD 1505_2942J-515012942SD 1501_2939J-515012939SD 1502_2939J-515022939SD 1503_2940J-515032940SD1504_2941J-515042941SD 1506_2943J-515062943SD 1507_2943J-515072943SD 1739_1740J-517391740SD 1740_1741J-517401741SD1741_1742J-517411742SD 1742_1743J-517421743SD 1743_1744J-517431744SD 1744_1745J-517441745SD 1745_1746J-517451746SD8BMP11748_1749J-517481749BMS1995RDSDCRCP12360.22 6BMP11750_1751J-517511750BMS1995RDSDCRCP12360.22 4BMP11752_1753J-517521753BMS1995RDSDCRCP12440.34 2939_2940J-529392940SD 2941_2942J-529412942SD2942_2943J-529422943SD 3026_3025J-530263025SD 11BMP1J-5BMS1995RDCULCCMP1564 13BMP1J-5BMS1995RDARCP2643 15BMP1J-5BMS1995RDSDCRCP12360.3816BMP1J-5BMS1995RDSDCRCP15220.48 19BMP1J-5BMS1995RDSDCRCP151101.09 1BI2J-5BIH, Ph 21997RDCULCRCP241160.73 1BMP1J-5BMS1995RDCULARCP2643 20BMP1J-5BMS1995RDSDCRCP12490.2221BMP1J-5BMS1995RDSDCRCP15150.21 2BI2J-5BIH, Ph 21997RDCULCCMP30600.5 2BMP1J-5BMS1995RDCULCCMP1574 3BI2J-5BIH, Ph 21997RDCULCCMP12341.5 4BI2J-5BIH, Ph 21997RDCGVCONC1.272370.45BMP1J-5BMS1995RDSDCRCP15270.5 7BMP1J-5BMS1995RDSDCRCP151180.22 9BMP1J-5BMS1995RDSDCRCP151230.2 2367_3208K-423673208SD 2368_3208K-423683208SD2369_3209K-423693209SD 2370_3209K-423703209SD 2371_3212K-423713212SD 2372_3212K-423723212SD 2375_3214K-423753214SD2376_3214K-423763214SD 2377_3216K-423773216SD 2378_3217K-423783217SD 2379_3217K-423793217SD 2380_3219K-423803219SD2381_3219K-423813219SD 2382_3220K-423823220SD 2383_3220K-423833220SD 2384_3221K-423843221 2385_3221K-4238532212386_3222K-423863222SD 2387_3222K-423873222SD 2410_3242K-424103242SD 2411_3242K-424113242SD 2412_3242K-424123242SD2417_3245K-424173245SD 2418_3246K-424183246SD 2419_3247K-424193247SD 2420_3247K-424203247SD 3207_3208K-432073208SD3208_3220K-432083220SD 3209_3210K-432093210SD 3210_3417K-432103417SD 3211_3210K-432113210SDRCP36 3212_3213K-432123213SD303213_3211K-432133211SDRCP30 20BPP23214_3426K-432143426BPE1990RDSDCRCP151370.6 3214_3215K-432143215SDRCP27 3215_3212K-432153212SD 3216_3214K-432163214SD153217_3212K-432173212SD15 3218_3383K-432183383SDRCP18 Page 11 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 3219_3209K-432193209SD18 3220_3221K-432203221SD3221_3407K-432213407 3222_3214K-432223214SDRCP24 3242_3245K-432423245SD 3245_3246K-432453246SDRCP15 3246_3247K-432463247SDRCP183247_3396K-432473396SD 3383_3382K-433833382SD 3408_3221K-434083221 3409_3207K-434093207SD 3410_3411K-434103411SD3412_3413K-434123413SD 3416_3409K-434163409D 3417_3416K-434173416SD 3418_3419K-434183419SD 3419_3218K-434193218SD3422_3416K-434223416D 3423_3422K-434233422CUL 3431_3423K-434313423D 3432_3431K-434323431CUL 3434_3432K-434343432D3435_3434K-434353434CUL 3436_3222K-434363222SDRCP18 10BPP2K-4BPE1990RDSDCRCP151300.2 10CP1-2K-4CS1992RDSDCRCP181300.2 11CP1-2K-4CS, Ph 1-21992RDSDCRCP12301.9712CP1-2K-4CS, Ph 1-21992RDSDCRCP12191.14 13BPP2K-4BPE1990RDCULAarch 14BPP2K-4BPE1990RDSDCRCP182541.94 15BPP2K-4BPE1990RDSDCRCP1237 16BPP2K-4BPE1990RDSDCRCP122217BPP2K-4BPE1990RDSDCRCP125 18BPP2K-4BPE1990RDSDCRCP125 19BPP2K-4BPE1990RDSDCRCP181300.2 1BPP2K-4BPE1990RDCULCCMP 1CP1-23203_3204K-432033204CS1992RDSDCRCP181000.221BPP23427_3426K-434273426BPE1990RDSDCRCP152651 22BPP23428_3433K-434283433BPE1990RDSDCRCP1223 23BPP2K-4BPE1990RDSDCRCP1228 23BPP23429_3427K-434293427BPE1990RDSDCRCP1213 2BPP23412_3413K-434123413BPE1990RDCULCCMP30202CP1-22359_3203K-423593203CS1992RDSDCRCP12222.35 31BPP23432_3431K-434323431BPE1990RDCULAArch 3BPP23206_3207K-432063207BPE1990RDSDCRCP183450.2 3CP1-22360_3203K-423603203CS1992RDSDCRCP12402.18 4BPP22365_3206K-423653206BPE1990RDSDCRCP1221ACTUALLY TIES INTO REACH NOT MH4CP1-23200_3203K-432003203CS1992RDSDCRCP153690.3 5BPP22366_3206K-423663206BPE1990RDSDCRCP1217.5 5CP1-22353_3200K-423533200CS1992RDSDCRCP1275.91 6BPP23201_3206K-432013206BPE1990RDSDCRCP151300.2 6CP1-22354_3200K-423543200CS1992RDSDCRCP12511.87BPP23205_3210K-432053210BPE1990RDSDCRCP182640.2 7CP1-23202_3205K-432023205CS1992RDSDCRCP15890.3 8BPP22363_3420K-423633420BPE1990RDSDCRCP1224 8CP1-22357_3202K-423573202CS1992RDSDCRCP1251.44 9BPP22364_3421K-423643421BPE1990RDSDCRCP1249CP1-22358_3202K-423583202CS1992RDSDCRCP12510.82 12PA2399_3233K-523993233NP1996RDSDCRCP121911.58 3221_3220K-532213220 38PA2390_3224K-523903224NP1996RDSDCRCP12615.17 37PA2391_3224K-523913224NP1996RDSDCRCP1228633PA2392_3226K-523923226NP1996RDSDCRCP12289.32 34PA2393_3226K-523933226NP1996RDSDCRCP12823.63 9PA2394_3228K-523943228NP1996RDSDCRCP12305.99 2395_3229K-523953229SD 6PA2396_3230K-523963230NP1996RDSDCRCP12492.973PA2397_3232K-523973232NP1996RDSDCRCP12274.98 4PA2398_3232K-523983232NP1996RDSDCRCP12616 12PA2399_3233K-523993233SD 36VCB2427_3250K-524273250VCBP1996RD 0.21 35VCB2428_3250K-524283250VCBP1996RD23VCB2429_3253K-524293253VCBP1996RDSDCRCP12 24VCB2430_3253K-524303253VCBP1996RDSDCRCP12 13VCB2431_3258K-524313258VCBP1996RDSDCRCP1252 12VCB2432_3258K-524323258VCBP1996RDSDCRCP1255 5VCB2433_2434K-524332434VCBP1996RDSDCRCP151340.64VCB2434_3263K-524343263VCBP1996RDSDCRCP15580.38 8USDA2435_3261K-524353261MU1994RDSDCRCP12 10USDA2436_3260K-524363260MU1994RDSDCRCP12 7USDA2437_3261K-524373261MU1994RD 2438_3265K-524383265SD4USDA2439_3266K-524393266MU1994RDSDC 3USDA2440_3266K-524403266MU1994RDSDC 16PA2441_3268K-524413268NP1996RDSDCRCP12104.5 15PA2442_3268K-524423268NP1996RDSDCRCP12266.73 36PA3223_3224K-532233224NP1996RDSDCRCP15236.1935PA3224_3225K-532243225NP1996RDSDCRCP153580.42 32PA3225_3226K-532253226NP1996RDSDCRCP15990.15 31PA3226_3227K-532263227NP1996RDSDCRCP15930.15 30PA3227_3228K-532273228NP1996RDSDCRCP152600.15 8PA3228_3229K-532283229NP1996RDSDCRCP151772.367PA3229_3230K-532293230NP1996RDSDCRCP151671.3 2PA3230_3231K-532303231NP1996RDSDCRCP151211.45 14VC13231_3239K-532313239VCS1995RDSDCRCP152521.27 5PA3232_3230K-532323230NP1996RDSDCRCP15180.38 10PA3233_3232K-532333232NP1996RDSDCRCP153880.3612VC13238_3237K-532383260VCS1995RDSDCRCP151071.33 13VC13239_3238K-532393238VCS1995RDSDCRCP152521.53 34VCB3250_3460K-532503460VCBP1996RDSDCRCP152080.4 37VCB3251_3250K-532513250VCBP1996RDSDCRCP151650.15 38VCB3252_3251K-532523251VCBP1996RDSDCRCP1513219VCB3253_3256K-532533256VCBP1996RDSDCRCP151020.65 20VCB3254_3253K-532543253VCBP1996RDSDCRCP15740.27 17VCB3255_3447K-532553447VCBP1996RDSDCRCP152720.19 18VCB3256_3255K-532563255VCBP1996RDSDCRCP151091.35 22VCB3257_3256K-532573256VCBP1996RDSDCRCP1288VCB3258_2433K-532582433VCBP1996RDSDCRCP15721 9VCB3259_3258K-532593258VCBP1996RDSDCRCP15670.33 9USDA3260_3261K-532603261MU1994RDSDCRCP15 3261_3265K-532613265SDC15216 2VCB3262_3264K-532623264VCBP1996RDSDCRCP15650.613VCB3263_3262K-532633262VCBP1996RDSDCRCP151630.61 1VCB3264_3266K-532643266VCBP1996RDSDCRCP15592.34 5USDA3265_3266K-532653266MU1994RD 3266_3267K-532663267SDRCP15 3267_3240K-532673240SDRCP1514PA3268_3227K-532683227NP1996RDSDCRCP15570.16 17PA3269_3268K-532693268NP1996RDSDCRCP151120.24 18PA3270_3269K-532703269NP1996RDSDCRCP15730.25 21PA3271_3270K-532713270NP1996RDSDCRCP15300.24 22PA3272_3271K-532723271NP1996RDSDCRCP15730.2423PA3273_3272K-532733272NP1996RDSDCRCP151340.2 24PA3274_3273K-532743273NP1996RDSDCRCP153340.73 39VCB3443_3251K-534433251VCBP1996RDSDCRCP1234 41VCB3444_3251K-534443251VCBP1996RDSDCRCP1216 40VCB3445_3252K-534453252VCBP1996RDSDCRCP123442VCB3446_3252K-534463252VCBP1996RDSDCRCP1216 21VCB3448_3256K-534483256VCBP1996RDSDCRCP128 3449_3265K-534493265SD 11USDA3450_3260K-534503260MU1994RDSDCRCP12 11PA3451_3233K-534513233NP1996RDSDCRCP12336.6713PA3452_3227K-534523227NP1996RDSDCRCP12160.22 41PA3453_3268K-534533268NP1996RDSDCRCP12480.22 19PA3454_3269K-534543269NP1996RDSDCRCP12210.22 20PA3455_3270K-534553270NP1996RDSDCRCP12420.22 25PA3456_3273K-534563273NP1996RDSDCRCP12390.2227PA3457_3274K-534573274NP1996RDSDCRCP12170.22 26PA3458_3274K-534583274NP1996RDSDCRCP12390.22 40PA3459_3223K-534593223NP1996RDSDCRCP12400.22 25VCB3462_3254K-534623254VCBP1996RDSDCRCP128 10VCB3463_3259K-534633259VCBP1996RDSDCRCP12811VCB3464_3259K-534643259VCBP1996RDSDCRCP128 3465_3467K-534653467D 3468_3466K-534683466D 3469_3468K-534693468C 3470_3469K-534703469D3471_3470K-534713470C 3472_3471K-534723471D 3473_3472K-534733472C 3474_3473K-534743473D 3475_3474K-534753474C3476_3475K-534763475D 39PA3477_3223K-534773223NP1996RDSDCRCP12160.22 10VC12403_3235K-524033235VCS1995RDSDCRCP18363.95 11VC12402_3235K-524023235VCS1995RDSDCRCP181311.02 14VCB2425_3441K-524253441VCBP1996RDSDCRCP1258315VC13466_3465K-534663465VCS1995RDCC 15VCB3249_2425K-532492425VCBP1996RDSDCRCP12179.38 16VCB3461_3249K-534613249VCBP1996RDSDCRCP12610.53 1VC13237_3240K-532373240VCS1995RDSDCRCP181090.51 28PA2443_3274K-524433274NP1996RDSDCRCP12220.4129PA2444_3274K-524443274NP1996RDSDCRCP12350.22 2VC12406_3207K-524063237VCS1995RDSDCRCP12398.67 Page 12 of 13 DescriptionSizeLength (ft) - see Note 1Slope (%) - see Note 1 Old GIS/MMILink1/4 SectionJunction NumberSubdivisionEstimated Year BuiltDepth orWidthSide SlopeFromCalc. FromFromCalc. FromNumberNumberMap No.UpstreamDownstreamor SID NameYearSourceTypeShapeMat'lDia. (in)(in)HorizontalVerticalPlansGPS PointsPlansGPS PointsComments LINK_NO MAP_NOJUNC_UPSJUNC_DNSSUB_SIDESTY_BLTESTY_SRCL_TYPEL_SHAPEL_MATLL_DEPDIAL_WIDTHL_SLPHL_SLPVL_L_PLL_L_GPSL_SL_PLL_SL_GPSCOMMENTS 3VC12405_3237K-524053237VCS1995RDSDCRCP12533.84 4VC12404_3237K-524043237VCS1995RDSDCRCP12470.595VC13236_3237K-532363237VCS1995RDSDCRCP151600.57 6USDA3261_3265K-532613265MU1994RDSDCU15216 6VC13234_3236K-532343236VCS1995RDSDCRCP15990.58 7VC12400_3234K-524003234VCS1995RDSDCRCP12591.75 8VC12401_3234K-524013234VCS1995RDSDCRCP18125.229VC13235_3234K-532353234VCS1995RDSDCRCP15700.65 10VWP13392_3393L-433923393VWS2002RDSDCPVC15 0.37 11VWP13327_3394L-433273394VWS2002RDSDCRCP151650.35 12VWP13394_3395L-433943395VWS2002RDSDCPVC153500.37 13VWP12664_2663L-426642663VWS2002RDSDCRCP1213VWP12663_3392L-426633392VWS2002RDSDCRCP12 14VWP12662_2661L-426622661VWS2002RDSDCRCP12 14VWP12661_3393L-426613393VWS2002RDSDCRCP12 19VWP13389_3384L-433893384VWS2002RDSDCPVC153050.29 1VWP13402_3403L-434023403VWS2002RDSDCHDPE15 2.4820VWP13384_3390L-433843390VWS2002RDSDCRCP15780.24 21VWP13390_3391L-433903391VWS2002RDSDCPVC153640.34 22VWP12668_2667L-426682667VWS2002RDSDCRCP12 22VWP12667_3389L-426673389VWS2002RDSDCRCP12 4VWP13404_3405L-434043405VWS2002RDSDCCMP363011.46VWP13405_3406L-434053406VWS2002RDSDARCP26.62543.75911 8VWP13401_3403L-434013403VWS2002RDSDARCP22.536.250.5 9VWP13403_3404L-434033404VWS2002RDSDARCP26.62543.75360.5 Page 13 of 13 Bozeman Storm Water Facilities Plan Appendix B: Storm Water System Analysis Data Appendix B:Storm Water System Analysis Data B.1 Introduction This appendix describes the creation and interpretation of a combined hydrologic and hydraulic storm water model of the City’s existing storm water system. The model is set up as a city-wide framework that can be improved upon as additional data on the storm drainage components becomes available. The purpose of the storm water model is to provide a tool for storm water management decisions, to identify and evaluate deficiencies in the existing system, and to provide information for evaluating proposed system improvements and future expansion or reconfiguration that will be needed to accommodate growth. Policy recommendations, potential solutions to known system deficiencies, and identification of system improvement projects are described in Chapter 6 (Recommended Plan). Chapter 2 (System Analysis) summarizes the general modeling process, results, and provides recommendations for gathering additional data. B.2 Hydrologic and Hydraulic Model Construction B.2.1 Model Selection and Overview The Storm Water Management Model (SWMM) is a computer model developed by the U.S. Environmental Protection Agency (USEPA) for analysis of urban storm water runoff. SWMM was chosen to model the City of Bozeman’s storm water system because of its ability to model various hydrologic processes and hydraulic situations for both single-event and extended periods of time on pervious and impervious land surfaces, streams, pipes, and through groundwater. Data requirements for hydrologic simulations include area, percent imperviousness, slope, roughness, width, depression storage, and infiltration parameters. Up to ten gages can be distributed spatially to develop precipitation and evaporation for runoff calculations. Simulation of snowmelt, subsurface drainage, and infiltration/inflow requires additional data. Some locations where overland flow is rare due to flat, sandy soils can be simulated using the subsurface drainage option in SWMM. B.2.2 Modeling Approach The hydrologic and hydraulic computer model has two purposes: 1.) to provide an overall, city-wide model that can be used immediately for large-scale planning purposes, and 2.) to provide for incremental refinement of the model over time as the completeness and accuracy of the storm drainage system inventory improves. The approach to meeting the above-stated goals was to set up a model that covers the entire study area in a general sense, and includes a more detailed “pilot basin” area that demonstrates an increased level of detail that can be applied elsewhere with further improvements to the storm drainage system inventory. The pilot basin can be used as a template for future refinement and expansion of the SWMM model, until the entire study area is covered in detail. The SWMM model can be expanded incrementally as the missing system inventory data is filled in. The City’s prioritization of the areas to be modeled in detail will depend on first completing the storm drain inventory for the areas of interest. B-1 Bozeman Storm Water Facilities Plan B.2.4 Data Requirements Due to the complicated nature of hydrologic and hydraulic modeling, data requirements are extensive. The following hydrologic information for each runoff catchment was required for the model: • Catchment size, in acres • Basin width • Average slope • Soil infiltration rates • Rainfall intensity • Percent impervious A critical hydrologic data set is the percent of impervious area under existing and future conditions. For existing conditions, the percent impervious area for each sub-catchment was calculated using the City’s 2004 land use inventory as shown in Figure 2.3-1 (Existing Land Use [2004]). For future conditions, the percent impervious area for each sub-catchment was calculated using the City’s 2020 Master Plan Map as shown in Figure 2.3-2 (2020 Future Land Use). The impervious percentages used for the SWMM model are tabulated in Appendix C (XP Tables). SWMM requires the following hydraulic information for modeling of both natural and manmade conveyance features: • Channel location • Channel cross-sections • Distance between cross-sections • Manning’s “n” (roughness) coefficient • Culvert invert elevations • Culvert size, shape, length, and material/roughness • Manhole locations, rim and invert elevations • Storm drain invert elevations • Storm drain size, shape, length, and material/roughness • Outfall locations Some of the above-described hydrologic and hydraulic data requirements are discussed in detail below. Percent Impervious The percent of impervious area within each sub-catchment can be calculated from maps identifying land use types and their limits throughout the study area, based on the percentage of each land use that exists within a particular sub-catchment. For existing conditions, the percent impervious area for each sub-catchment was calculated using the City’s 2004 land use inventory, and the assumed impervious percentages for each land use as shown in Table B.2-1. B-2 Table B.2-1 Percent Impervious under Existing Land Use Conditions Existing Land Use (2005) Code % Impervious Administrative/Professional AP 90% Commercial/Retail C 70% Commercial/Auto CA 90% Church CHURCH 70% Duplex/Triple Residential DTHR 50% Golf Course GOLF 5% Hotel/Motel HM 70% Light Manufacturing LM 70% Mobile Home/Mobile Park MHMP 45% Multi-Family Residential MHR 35% Mixed Use MIXED 65% Public Facility/Park PFP 10% Restaurant/Bar RB 70% Right of Way ROW 100% School/Educational Facility SEF 65% Single-Family Residential SHR 45% Vacant VACANT 5% For future conditions, the percent impervious area for each sub-catchment was calculated using the City’s 2020 Master Plan Map as shown in Table E-3 Future Land Use, 2020 and the assumed impervious percentages for each land use as shown in Table B.2-2. Table B.2-2 Percent Impervious under Future Land Use Conditions Future Conditions: Master Plan Land Use Zoning Classification Future % Impervious Future with LID1 % Impervious Business Park 90% 70% Community Commercial 70% 65% Golf Course 5% 5% Industrial 90% 80% Neighborhood Commercial 70% 65% Other Public Lands 35% 35% Parks, Open Space, and Recreational Lands 10% 10% B-3 Bozeman Storm Water Facilities Plan B-4 Table B.2-2 Percent Impervious under Future Land Use Conditions Future Conditions: Master Plan Land Use Zoning Classification Future % Impervious Future with LID1 % Impervious Public Institutions 65% 50% Regional Commercial and Services 70% 70% Residential Infill 55% 50% Residential Limited 35% 35% Suburban Residential 45% 40% 1 Low Impact Developmentigure Sub-Catchment Delineation Runoff from existing and future urbanized areas in the City of Bozeman will result in impacts to the local natural drainage network. To model these impacts as one large system, a downstream location was selected that would “feel” the impacts of the City’s current and potential future boundaries. The area draining to this point is referred to as a “sub-basin.” The overall sub-basin area was then subdivided into several smaller areas called “sub-catchments.” Each sub-catchment is defined by a single point within the sub-basin, and the area draining to that point. Initially, the study area sub-basin was subdivided into sub-catchments defined by major confluence points and other topographical features, in combination with major watersheds as mapped by the National Hydrography Dataset. The next step used ArcHydro, described below, to subdivide the major watersheds. The sub-catchments were then further subdivided based on the parcel and streets database, and on the photo-based topographic mapping at a 5-foot contour interval described in Chapter 1 (Existing System Inventory). Through this process, approximately 60 catchments were identified with an average size of 300 acres. The largest basin was 5,400 acres and the smallest was slightly less than 3 acres. ArcHydro is a geospatial and temporal data model for water resources that operates within ArcGIS. It has an associated set of tools, developed jointly by ESRI and the Center for Research in Water Resources at the University of Texas. ArcHydro provides the capability to automatically delineate a watershed given a raster digital elevation model (DEM) or a triangulated irregular network (TIN). The program tracks the flow of water across the landscape and identifies areas where flow accumulates (i.e. streams, ponds, and lakes), then defines catchment areas that contribute to them. The digital elevation model used in this study was the National Elevation Dataset. This dataset provides a grid of cells, 100 square meters (1,076 square feet) in size, with an elevation assigned to each. This level of horizontal resolution provides an ability to accurately generate 20 foot contours. As such, many of the streams and canals in and around the City of Bozeman are not large enough to effectively be represented. To address this, ArcHydro has the ability to “burn in” a stream network to aid in delineating areas with little topographical relief or with poor DEM or TIN resolution. This process involves automatically dropping the elevation of each cell that coincides with a stream network, to more accurately represent the actual terrain at stream locations. In this way, ArcHydro can compensate for poor resolution by forcing drainage to known stream locations. The sub-catchments in the pilot basin were defined with a higher degree of accuracy by using surveyed link and node data combined with photo-based topographic mapping, as provided or described in Chapter 1 (Existing System Inventory). Drainage Network After delineation of the overall model was completed by the above-described ArcHydro, but before insertion of the pilot basin sub-catchments, the ArcHydro software built a network of links and nodes to establish connectivity between the sub-catchment drainage outlets. This network, shown in Figure 2.3-3 (City of Bozeman Regional Drainage Network), was created from a combination of the basin delineation, drainage outlets, and the mapped stream network. After the network generated by ArcHydro was complete, the network was further refined by incorporating the pilot basin sub-catchments, shown in Figure 2.3-4 (Pilot Basin Drainage Network). The City’s storm water system can significantly alter the natural landscape and affect the storm water drainage pathways, thus altering the size and shape of the delineated sub-catchments. The existing storm water inventory described in Chapter 1 (Existing System Inventory) lacks the detail required to adequately track how water moves through the city’s constructed conveyance structures to outfall points along the natural drainage network. Therefore, additional data collection will be required to build an accurate hydraulic model. Basin Width The basin width is determined by one of two methods. If the predominant type of flow in the basin is overland, the basin width is equal to the square root of the basin area. Otherwise, the basin width is equal to the length of the flow path divided by the basin area. The length of the flow path is determined by measuring the distance from the upper reaches of the subbasin, through the overland and storm water conveyance path, to the tributary node of each subbasin. Average Slope Average slope for the sub-basins was calculated from the digital elevation model. Slopes were calculated for each cell of the model, and then averaged within each sub-basin. Soil Infiltration Rates Infiltration rates can be determined from the SSURGO dataset for the area, which identifies the types of soils and their limits throughout the study area. From this dataset, an average infiltration rate (or any other soil parameter) can be developed based on the percentage of each soil type that exists within a particular sub-catchment. B.2.5 Data Sources Hydrology • National Hydrography Dataset (NHD) – basin delineation, basin width • National Elevation Dataset (NED) – basin delineation, average slope • Soil Survey Geographic (SSURGO) Database – soil infiltration rates B-5 Bozeman Storm Water Facilities Plan B-6 • City of Bozeman GIS Database – land use data for percent impervious calculations Hydraulics • City of Bozeman storm water inventory database – manmade conveyance channel geometry, locations, and elevations, natural channel cross sections • National Elevation Dataset (NED) – node invert and spillway elevations • National Hydrography Dataset (NHD) – natural conveyance channel locations B.3 Hydrologic and Hydraulic Model Construction B.3.1 Model Selection and Overview The Storm Water Management Model (SWMM) is a computer model developed by the U.S. Environmental Protection Agency (USEPA) for analysis of urban storm water runoff. SWMM was chosen to model the City of Bozeman’s storm water system because of its ability to model various hydrologic processes and hydraulic situations for both single-event and extended periods of time on pervious and impervious land surfaces, streams, pipes, and through groundwater. Data requirements for hydrologic simulations include area, percent imperviousness, slope, roughness, width, depression storage, and infiltration parameters. Up to ten gages can be distributed spatially to develop precipitation and evaporation for runoff calculations. Simulation of snowmelt, subsurface drainage, and infiltration/inflow requires additional data. Some locations where overland flow is rare due to flat, sandy soils can be simulated using the subsurface drainage option in SWMM. B.3.2 Modeling Approach The hydrologic and hydraulic computer model has two purposes: 1.) to provide an overall, city-wide model that can be used immediately for large-scale planning purposes, and 2.) to provide for incremental refinement of the model over time as the completeness and accuracy of the storm drainage system inventory improves. The approach to meeting the above-stated goals was to set up a model that covers the entire study area in a general sense, and includes a more detailed “pilot basin” area that demonstrates an increased level of detail that can be applied elsewhere with further improvements to the storm drainage system inventory. The pilot basin can be used as a template for future refinement and expansion of the SWMM model, until the entire study area is covered in detail. The SWMM model can be expanded incrementally as the missing system inventory data is filled in. The City’s prioritization of the areas to be modeled in detail will depend on first completing the storm drain inventory for the areas of interest. Bozeman Storm Water Facilities Plan Appendix C: XP Tables Appendix C-1 – Nodes, Input Data Appendix C-2 – Nodes, Output Data Appendix C-3 – Links, Input Data Appendix C-4 – Links, Output Data Bozeman Storm Water Facilities Plan Appendix C-1: Nodes, Input Data XP SWMM - NODES, INPUT DATA SubcatchmentPercentSlopeWidthInfiltrationRainfallInvertGround Elev.Ponding NameArea (ac)Impervious(ft/ft)(ft)ReferenceReferenceElevation(Spill Crest) Type EG7S 904.06551.40.01381746.94LSL24 hr4602.4944622.494Allowed EG7L 895.5148.30.01092425.49LSL24 hr4469.2274489.227Allowed EG7K 973.2853.30.0132196.03SLL24 hr4618.1914638.191Allowed EG7F 1245.4718.20.00982577.784LSL24 hr4469.2274489.227Allowed H16 00004469.2274489.227Allowed EG5Q 1811.36948.50.01533979.404L24 hr4840.9834860.983Allowed EG5P 684.634630.0132012.407LSL24 hr4653.2984673.298Allowed EG6B 266.83668.80.01221406.398SLL24 hr4645.6124665.612Allowed EG5E 47.20871.70.01661016.427L24 hr4624.0454644.045Allowed EG4B 455.267.90.02022423.827L24 hr4713.0984733.098Allowed BC2F 81540.70.06262235.537L24 hr4849.644869.64Allowed BC1A 1157.11924.10.07534593.152L24 hr5000.2015020.201Allowed BC2C 201.291350.01392690.07L24 hr5061.3145081.314Allowed BC2A 663.85756.80.01772208.743SL24 hr4888.1724908.172Allowed BC2E 667.41344.10.0232274.95L24 hr4887.1874907.187Allowed H14 00004878.1364898.136Allowed BC2B 230.755.80.01781975.651SL24 hr4847.8784867.878Allowed H8 00004848.0664868.066Allowed BC3B 54.256.40.012600SL24 hr47674787Allowed 351925.3580.03450SL24 hr4866.394876.81Allowed 351800004865.054874.15Allowed 305600004852.34857.32Allowed 305500004849.294856.74Allowed 295500004834.064840.21Allowed 307100004829.784836.18Allowed 307200004820.974827.33Allowed 307500004812.274818.44Allowed 306200004813.094818.09Allowed 295627.26580.029550SL24 hr4837.794843.04Allowed 307000004827.354833.22Allowed 305900004818.074823.78Allowed 307300004817.744823.14Allowed 307400004810.044817.2Allowed 307612.21580.009500SL24 hr4808.574813.74Allowed 307800004806.764811.66Allowed 352000004806.264811.4Allowed 307700004805.644811.09Allowed 306700004804.754810.55Allowed 306600004803.634810.23Allowed 306821.21650.011600SL24 hr4801.954807.5Allowed 296500004798.794804.99Allowed 296400004797.114803.51Allowed 284500004790.524795.02Allowed 352700004788.724808.72Allowed 286700004785.794792.04Allowed 305410.66580.027400SL24 hr4854.84860.82Allowed 303800004853.844858.7Allowed 352900004850.784855.45Allowed 295700004840.834845.07Allowed 305800004827.684832.68Allowed 306000004819.364824.8Allowed 306115.79580.011400SL24 hr4813.684819.37Allowed 306300004809.464812.49Allowed 306400004808.054813.74Allowed 306500004805.854811.33Allowed 306900004802.934809.83Allowed 295814.9580.022550SL24 hr4838.564843.91Allowed Page 1 of 3 SubcatchmentPercentSlopeWidthInfiltrationRainfallInvertGround Elev.Ponding NameArea (ac)Impervious(ft/ft)(ft)ReferenceReferenceElevation(Spill Crest) Type 310400004828.494834.21Allowed 310511.93580.016400SL24 hr4815.564820.86Allowed 310600004811.564816.66Allowed 310700004806.74812.5Allowed 310800004802.774808.77Allowed 310900004798.174803.42Allowed 29637.99800.025400SL24 hr4789.534795.43Allowed 280300004787.154791.55Allowed 352800004785.624805.62Allowed 315100004782.544788.69Allowed 278013.68580.026550SL24 hr4845.314851.5Allowed 277900004839.724845.72Allowed 277800004834.694840.24Allowed 277700004819.244824.92Allowed 27766.74580.018400SL24 hr4810.364816.06Allowed 277500004803.854809.5Allowed 277400004801.384806.97Allowed 276910.95800.016400SL24 hr4797.034802.55Allowed 276800004791.744796.84Allowed 315200004789.934794.4Allowed 280400004788.524792.72Allowed 289100004782.334786.83Allowed 315000004781.494789.85Allowed 314900004780.264791.11Allowed 311117.11580.027600SL24 hr4818.974824.15Allowed 311200004809.874815.13Allowed 311300004806.774812.24Allowed 311400004801.884806.41Allowed 311516.39800.012400SL24 hr4798.924804.14Allowed 311000004794.984800.08Allowed 296200004791.634796.91Allowed 352100004789.354793.31Allowed 314800004779.814790.63Allowed 311926580.021600SL24 hr4809.544814.8Allowed 311800004803.734809.46Allowed 311717.73750.011400SL24 hr4798.34804.57Allowed 311600004794.544798.98Allowed 296100004789.524794.82Allowed 315300004788.524793.02Allowed 352200004788.024792.4Allowed 280500004787.644792.08Allowed 289000004781.34786.35Allowed 314700004778.994789.09Allowed 312026.42650.012500SL24 hr4794.214799.23Allowed 296000004790.764795.77Allowed 114300004788.254792.25Allowed 314600004776.624789.43Allowed 279900004775.744788.89Allowed 35269.99480.012500SL24 hr4805.854814.11Allowed 329200004799.744807.97Allowed 329100004793.774802.37Allowed 329021.58750.011450SL24 hr4791.014796.78Allowed 328900004787.74794.87Allowed 352500004787.634794.33Allowed 352400004787.174792.57Allowed 352300004786.744790.49Allowed 279800004783.454788.43Allowed 113800004787.214791.36Allowed 280100004779.124788.26Allowed 280000004775.534788.26Allowed Page 2 of 3 SubcatchmentPercentSlopeWidthInfiltrationRainfallInvertGround Elev.Ponding NameArea (ac)Impervious(ft/ft)(ft)ReferenceReferenceElevation(Spill Crest) Type 345900004772.644779.12Allowed 289400004769.694789.69Allowed 353000004769.234789.23Allowed 2488000047664786Allowed BC3A 306.867.50.01853699.801SL24 hr47434763Allowed EG1D 4399.4518.60.11317602.682LSL24 hr4813.2634833.263Allowed EG1C 426.80334.90.19822915.751L24 hr4783.1644803.164Allowed EG1G 175.61956.80.04231576.65SL24 hr4804.3434824.343Allowed EG1B 1524.27226.80.0893824.608L24 hr4956.5184976.518Allowed EG1A 484.68255.50.07753122.427SL24 hr4825.954845.95Allowed EG1F 537.342.90.04782082.074SL24 hr4793.9364813.936Allowed H9 00004795.0314815.031Allowed EG1E 111.36828.80.05751670.547L24 hr4800.8684820.868Allowed H12 00004786.7274806.727Allowed H10 00004783.0184803.018Allowed EG2B 98.84470.80.01481943.558L24 hr4759.3154779.315Allowed H18 00004759.1674779.167Allowed H11 00004719.754739.75Allowed EG2D 1791.43245.40.15524341.869L24 hr4694.2454714.245Allowed EG2A 1525.6295.40.43453126.365SL24 hr4804.4364824.436Allowed H19 00004875.1854895.185Allowed EG2C 703.89115.80.18273789.998L24 hr4794.1114814.111Allowed EG2E 513.93935.40.08072430.6LSL24 hr4693.9414713.941Allowed H6 00004691.8934711.893Allowed H7 00004662.6514682.651Allowed EG3A 186.33835.50.0108853.495L24 hr4659.0144679.014Allowed EG5B 1352.262.90.01593465.362SLL24 hr4730.144750.14Allowed EG4A 358.2487.40.01852612.877SL24 hr4674.54694.5Allowed EG4C 273.35945.20.02081270.725L24 hr4659.5894679.589Allowed EG5G 388.95141.80.01372811.005CLL24 hr4622.5544642.554Allowed H4 00004623.4354643.435Allowed H3 00004607.2954627.295Allowed H13 00005432.2425452.242Allowed EGT1A 1667.90323.70.12432853.385SLL24 hr4624.6444644.644Allowed EGT1B 30.4349.60.01041344.746SCLL24 hr4619.5064639.506Allowed EGT2A 1473.36214.50.14753264.978SLL24 hr4624.0844644.084Allowed H1 00004607.1554627.155Allowed H2 00004584.1884604.188Allowed EG6A 6130.3636.40.19645567.686SLL24 hr4509.0734529.073Allowed EG7H 4147.79433.50.01775560.598LSL24 hr4481.4024501.402Allowed EG7B 2404.31612.30.01566686.37LCL24 hr4839.3824859.382Allowed EG7G 2372.65428.70.01565163.546L24 hr4848.5954868.595Allowed EG7C 4261.11410.30.0175697.127SLL24 hr4479.1954499.195Allowed H17 00004479.0794499.079Allowed H15 00004413.8924433.892Allowed Page 3 of 3 Bozeman Storm Water Facilities Plan Appendix C-2: Nodes, Output Data XP SWMM - NODES, OUTPUT DATA NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) EG7S Existing2-yr, 24-hr1759056.74622.4944603.163043.50219.33 10-yr, 24-hr3761510.534622.4944603.6220100.87318.87 25-yr, 24-hr4166113.144622.4944603.6990112.03518.79 50-yr, 24-hr5540896.294622.4944603.9430150.19518.55 100-yr, 24-hr6354355.144622.4944604.0780172.75918.42 Future2-yr, 24-hr1759420.674612.4944603.163043.50219.33 10-yr, 24-hr3761830.344612.4944603.6220100.87318.87 25-yr, 24-hr4166327.484612.4944603.6990112.03518.8 50-yr, 24-hr5543249.084612.4944603.9430150.19518.55 100-yr, 24-hr6352819.344612.4944604.0780172.75918.42 Pre-Development2-yr, 24-hr371773.4354612.4944602.782011.00819.71 10-yr, 24-hr1866676.164612.4944603.151042.28819.34 25-yr, 24-hr2226709.984612.4944603.217049.41319.28 50-yr, 24-hr3483607.874612.4944603.432075.14419.06 100-yr, 24-hr4240985.464612.4944603.553091.34818.94 EG7L Existing2-yr, 24-hr497718.7464489.2274471.254015.37217.97 10-yr, 24-hr2046495.744489.2274472.327053.14816.9 25-yr, 24-hr2412985.584489.2274472.528061.49116.7 50-yr, 24-hr3681024.384489.2274473.197091.14816.03 100-yr, 24-hr4444249.054489.2274473.5830109.52515.64 Future2-yr, 24-hr497808.1334480.2274471.253015.37217.97 10-yr, 24-hr2046658.314480.2274472.326053.14816.9 25-yr, 24-hr2413161.654480.2274472.527061.49116.7 50-yr, 24-hr3682407.374480.2274473.196091.14816.03 100-yr, 24-hr4443419.954480.2274473.5830109.52515.64 Pre-Development2-yr, 24-hr396007.4954489.2274470.763012.29318.46 10-yr, 24-hr1909277.734489.2274471.634048.41517.59 25-yr, 24-hr2271456.734489.2274471.807056.51917.42 50-yr, 24-hr3533230.834489.2274472.397085.47916.83 100-yr, 24-hr4291298.114489.2274472.7480103.51216.48 EG7K Existing2-yr, 24-hr2075355.394638.1914618.983052.60319.21 10-yr, 24-hr4496841.334638.1914619.5140119.55318.68 25-yr, 24-hr4948704.664638.1914619.60132.12118.59 50-yr, 24-hr6461959.014638.1914619.8730174.60418.32 100-yr, 24-hr7350241.744638.1914620.0330201.67318.16 Future2-yr, 24-hr2075795.834628.1914618.983052.60319.21 10-yr, 24-hr4497237.664628.1914619.5130119.55318.68 25-yr, 24-hr4948907.44628.1914619.60132.12118.59 50-yr, 24-hr6464734.634628.1914619.8730174.60418.32 100-yr, 24-hr7348393.934628.1914620.0330201.67318.16 Pre-Development2-yr, 24-hr614734.7734638.1914618.558015.08919.63 10-yr, 24-hr2732631.634638.1914619.004055.00219.19 25-yr, 24-hr3152358.194638.1914619.081063.57919.11 50-yr, 24-hr4579706.314638.1914619.328094.0918.86 100-yr, 24-hr5424967.674638.1914619.4660113.0518.72 EG7F Existing2-yr, 24-hr632777.984489.2274471.432018.79317.8 10-yr, 24-hr2719914.174489.2274472.54061.21416.69 25-yr, 24-hr3218140.474489.2274472.742070.7816.48 50-yr, 24-hr4948521.564489.2274473.4120105.24315.82 100-yr, 24-hr5993858.254489.2274473.7970126.91915.43 Future2-yr, 24-hr632881.3934480.2274471.431018.79317.8 10-yr, 24-hr2720091.084480.2274472.539061.21416.69 25-yr, 24-hr3218316.854480.2274472.741070.7816.49 50-yr, 24-hr4950169.864480.2274473.4110105.24315.82 100-yr, 24-hr5993008.674480.2274473.7970126.91915.43 Pre-Development2-yr, 24-hr494663.0764489.2274470.894014.38818.33 10-yr, 24-hr2528844.454489.2274471.84054.42617.39 25-yr, 24-hr3020635.034489.2274472.019063.59817.21 50-yr, 24-hr4740189.244489.2274472.621096.85616.61 Page 1 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 100-yr, 24-hr5778052.094489.2274472.9750117.89616.25 H16 Existing2-yr, 24-hr04489.2274470.703018.52 10-yr, 24-hr04489.2274471.944017.28 25-yr, 24-hr04489.2274472.163017.06 50-yr, 24-hr04489.2274472.876016.35 100-yr, 24-hr04489.2274473.28015.95 Future2-yr, 24-hr04479.2274470.703018.52 10-yr, 24-hr04479.2274471.943017.28 25-yr, 24-hr04479.2274472.162017.07 50-yr, 24-hr04479.2274472.875016.35 100-yr, 24-hr04479.2274473.279015.95 Pre-Development2-yr, 24-hr04489.2274470.06019.17 10-yr, 24-hr04489.2274471.166018.06 25-yr, 24-hr04489.2274471.367017.86 50-yr, 24-hr04489.2274472.026017.2 100-yr, 24-hr04489.2274472.406016.82 EG5Q Existing2-yr, 24-hr3254611.64860.9834841.927086.68619.06 10-yr, 24-hr7042619.454860.9834842.6090206.03318.37 25-yr, 24-hr7820127.894860.9834842.7220228.86518.26 50-yr, 24-hr1.05E+074860.9834843.0880308.38417.9 100-yr, 24-hr1.21E+074860.9834843.3140361.42717.67 Future2-yr, 24-hr3255237.124850.9834841.927086.68619.06 10-yr, 24-hr7043338.224850.9834842.570206.03318.41 25-yr, 24-hr7820461.254850.9834842.6830228.86518.3 50-yr, 24-hr1.05E+074850.9834844.6480308.38416.33 100-yr, 24-hr1.21E+074850.9834874.49733.2361.427-13.51 Pre-Development2-yr, 24-hr575180.8714860.9834841.351018.86319.63 10-yr, 24-hr3252211.434860.9834841.943089.20419.04 25-yr, 24-hr3935360.374860.9834842.0440104.84118.94 50-yr, 24-hr6392831.694860.9834842.3740161.28418.61 100-yr, 24-hr7893275.734860.9834842.5610196.69618.42 EG5P Existing2-yr, 24-hr1611311.584673.2984654.658043.23718.64 10-yr, 24-hr3217156.414673.2984655.635094.22417.66 25-yr, 24-hr3532303.634673.2984655.7730104.58417.53 50-yr, 24-hr4597040.794673.2984656.260142.86817.04 100-yr, 24-hr5223773.914673.2984656.5580165.75916.74 Future2-yr, 24-hr1611637.434663.2984654.658043.23718.64 10-yr, 24-hr3217503.14663.2984754.122394.594.224-80.82 25-yr, 24-hr3532397.014663.2984765.932448.1104.584-92.63 50-yr, 24-hr4599143.624663.2984823.028557.9142.868-149.73 100-yr, 24-hr5222195.574663.2984869.993994.4165.759-196.7 Pre-Development2-yr, 24-hr319463.6844673.2984653.826010.37119.47 10-yr, 24-hr1491842.414673.2984654.758041.30418.54 25-yr, 24-hr1771295.394673.2984654.913048.14118.38 50-yr, 24-hr2744699.454673.2984655.32072.3417.98 100-yr, 24-hr3328482.014673.2984655.549087.25917.75 EG6B Existing2-yr, 24-hr710431.3874665.6124646.853022.05418.76 10-yr, 24-hr1398480.54665.6124647.679050.06617.93 25-yr, 24-hr1525123.614665.6124647.871055.22117.74 50-yr, 24-hr1946841.424665.6124648.527072.517.08 100-yr, 24-hr2193683.544665.6124648.919082.5516.69 Future2-yr, 24-hr710556.0054655.6124646.853022.05418.76 10-yr, 24-hr1398683.814655.6124748.382429.350.066-82.77 25-yr, 24-hr1525079.894655.6124760.68549155.221-95.07 50-yr, 24-hr1947774.064655.6124822.466641.372.5-156.85 100-yr, 24-hr2192857.814655.6124869.5571067.882.55-203.94 Pre-Development2-yr, 24-hr206599.9374665.6124646.11806.95519.49 10-yr, 24-hr810313.3214665.6124646.746024.64918.87 25-yr, 24-hr929520.0794665.6124646.846028.1218.77 50-yr, 24-hr1332124.124665.6124647.285039.87218.33 100-yr, 24-hr1568717.464665.6124647.606046.81418.01 EG5E Existing2-yr, 24-hr127131.0834644.0454630.45106.01213.59 Page 2 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 10-yr, 24-hr242518.164644.0454646.921552.412.173-2.88 25-yr, 24-hr264547.5464644.0454647.121654.713.142-3.08 50-yr, 24-hr338370.0534644.0454647.627944.516.294-3.58 100-yr, 24-hr381678.2364644.0454647.842117018.109-3.8 Future2-yr, 24-hr127118.884634.0454630.4506.01213.59 10-yr, 24-hr242577.3024634.0454763.654511.912.173-119.61 25-yr, 24-hr264519.8154634.0454775.78593.913.142-131.73 50-yr, 24-hr338537.5124634.0454850.7081196.416.294-206.66 100-yr, 24-hr381518.9524634.0454875.2511609.418.109-231.21 Pre-Development2-yr, 24-hr24799.7974644.0454627.80501.81116.24 10-yr, 24-hr108423.0784644.0454645.644280.57.874-1.6 25-yr, 24-hr128090.2354644.0454646.158404.29.023-2.11 50-yr, 24-hr196690.0334644.0454647.051755.712.659-3.01 100-yr, 24-hr237285.9094644.0454647.368908.814.678-3.32 EG4B Existing2-yr, 24-hr1144871.364733.0984713.63039.04719.47 10-yr, 24-hr2231345.814733.0984713.953090.23219.15 25-yr, 24-hr2439742.884733.0984713.975099.55519.12 50-yr, 24-hr3143115.324733.0984714.0250130.39819.07 100-yr, 24-hr3557295.824733.0984714.0270148.16719.07 Future2-yr, 24-hr1145009.74723.0984713.63039.04719.47 10-yr, 24-hr2231728.264723.0984784.489335.790.232-51.39 25-yr, 24-hr2439606.244723.0984794.597409.299.555-61.5 50-yr, 24-hr3144657.964723.0984847.084514.2130.398-113.99 100-yr, 24-hr3555842.74723.0984890.568892.7148.167-157.47 Pre-Development2-yr, 24-hr190671.6844733.0984713.30608.42119.79 10-yr, 24-hr934271.3374733.0984713.647040.92419.45 25-yr, 24-hr1103008.754733.0984713.681047.21819.42 50-yr, 24-hr1741332.744733.0984713.835068.33319.26 100-yr, 24-hr2134564.294733.0984713.876081.07819.22 BC2F Existing2-yr, 24-hr1321033.314869.644850.24048.99919.4 10-yr, 24-hr3008697.074869.644850.9270125.60518.71 25-yr, 24-hr3353571.914869.644851.0750140.82818.57 50-yr, 24-hr4546132.334869.644851.5980192.69518.04 100-yr, 24-hr5269723.244869.644851.9160223.40317.72 Future2-yr, 24-hr1321165.764859.644850.24048.99919.4 10-yr, 24-hr3009222.244859.644850.920125.60518.72 25-yr, 24-hr3353484.714859.644850.9660140.82818.67 50-yr, 24-hr4548453.994859.644851.5180192.69518.12 100-yr, 24-hr5267513.744859.644853.1550223.40316.48 Pre-Development2-yr, 24-hr333350.2744869.644849.916014.19819.72 10-yr, 24-hr1650752.54869.644850.444069.82419.2 25-yr, 24-hr1949241.954869.644850.546080.79219.09 50-yr, 24-hr3100255.334869.644850.8950117.88918.74 100-yr, 24-hr3801954.514869.644851.1070139.67818.53 BC1A Existing2-yr, 24-hr1273907.185020.2015000.915053.39719.29 10-yr, 24-hr3485875.575020.2015001.670169.17318.53 25-yr, 24-hr3964837.825020.2015001.7950192.32218.41 50-yr, 24-hr5631475.525020.2015002.1840270.37318.02 100-yr, 24-hr6631946.125020.2015002.3940316.08417.81 Future2-yr, 24-hr1274001.625010.2015000.915053.39719.29 10-yr, 24-hr3486592.195010.2015001.6690169.17318.53 25-yr, 24-hr3964740.965010.2015001.7940192.32218.41 50-yr, 24-hr5634506.75010.2015002.1830270.37318.02 100-yr, 24-hr6628929.875010.2015002.3940316.08417.81 Pre-Development2-yr, 24-hr525532.8185020.2015000.668026.77219.53 10-yr, 24-hr2477020.385020.2015001.3970121.40718.8 25-yr, 24-hr2923915.15020.2015001.50138.4218.7 50-yr, 24-hr4526421.515020.2015001.8790208.64318.32 100-yr, 24-hr5518817.85020.2015002.0950251.85118.11 BC2C Existing2-yr, 24-hr299218.7335081.3145061.586013.39519.73 10-yr, 24-hr713284.9125081.3145061.833038.33519.48 25-yr, 24-hr800888.3975081.3145061.871042.85719.44 Page 3 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 50-yr, 24-hr1100373.685081.3145061.981057.51519.33 100-yr, 24-hr1278353.525081.3145062.039065.83119.27 Future2-yr, 24-hr299225.4655071.3145061.586013.39519.73 10-yr, 24-hr713456.7335071.3145061.833038.33519.48 25-yr, 24-hr800818.5755071.3145061.87042.85719.44 50-yr, 24-hr1100956.65071.3145061.981057.51519.33 100-yr, 24-hr1277741.685071.3145062.039065.83119.27 Pre-Development2-yr, 24-hr97877.6355081.3145061.47805.78919.84 10-yr, 24-hr445410.0765081.3145061.714025.15919.6 25-yr, 24-hr525935.4565081.3145061.754029.42719.56 50-yr, 24-hr811281.1255081.3145061.876043.68419.44 100-yr, 24-hr981840.235081.3145061.94051.94419.37 BC2A Existing2-yr, 24-hr1581498.74908.1724888.968046.68719.2 10-yr, 24-hr3315152.294908.1724889.5730105.71318.6 25-yr, 24-hr3628529.164908.1724889.6710117.44418.5 50-yr, 24-hr4671933.274908.1724889.9810157.51318.19 100-yr, 24-hr5283122.244908.1724890.1490181.22818.02 Future2-yr, 24-hr1581814.674898.1724888.968046.68719.2 10-yr, 24-hr3315562.844898.1724889.5720105.71318.6 25-yr, 24-hr3628524.84898.1724889.6710117.44418.5 50-yr, 24-hr4674127.014898.1724889.9760157.51318.2 100-yr, 24-hr5281324.264898.1724890.1490181.22818.02 Pre-Development2-yr, 24-hr620668.7274908.1724888.604015.94519.57 10-yr, 24-hr2224655.34908.1724889.135055.06719.04 25-yr, 24-hr2523597.734908.1724889.216062.9118.96 50-yr, 24-hr3529488.754908.1724889.466089.8918.71 100-yr, 24-hr4119802.364908.1724889.6020106.09518.57 BC2E Existing2-yr, 24-hr1141891.274907.1874887.832038.09519.36 10-yr, 24-hr2536668.974907.1874888.327095.45118.86 25-yr, 24-hr2817583.284907.1874888.4110106.97918.78 50-yr, 24-hr3800818.184907.1874888.6820146.73818.51 100-yr, 24-hr4399776.034907.1874888.8310170.52118.36 Future2-yr, 24-hr1142048.294897.1874887.832038.09519.36 10-yr, 24-hr2537055.364897.1874888.326095.45118.86 25-yr, 24-hr28175694897.1874888.4110106.97918.78 50-yr, 24-hr3802706.714897.1874888.6810146.73818.51 100-yr, 24-hr4398082.014897.1874888.8310170.52118.36 Pre-Development2-yr, 24-hr253710.2364907.1874887.46709.80519.72 10-yr, 24-hr1302069.234907.1874887.941049.05319.25 25-yr, 24-hr1558427.144907.1874888.017057.16119.17 50-yr, 24-hr2492613.244907.1874888.251085.22318.94 100-yr, 24-hr3061269.124907.1874888.3790102.0818.81 H14 Existing2-yr, 24-hr04898.1364879.119019.02 10-yr, 24-hr04898.1364879.882018.25 25-yr, 24-hr04898.1364880.01018.13 50-yr, 24-hr04898.1364880.415017.72 100-yr, 24-hr04898.1364880.637017.5 Future2-yr, 24-hr04888.1364879.119019.02 10-yr, 24-hr04888.1364879.881018.26 25-yr, 24-hr04888.1364880.008018.13 50-yr, 24-hr04888.1364880.411017.72 100-yr, 24-hr04888.1364880.637017.5 Pre-Development2-yr, 24-hr04898.1364878.625019.51 10-yr, 24-hr04898.1364879.314018.82 25-yr, 24-hr04898.1364879.422018.71 50-yr, 24-hr04898.1364879.759018.38 100-yr, 24-hr04898.1364879.942018.19 BC2B Existing2-yr, 24-hr557878.8044867.8784850.958023.12316.92 10-yr, 24-hr1166174.084867.8784851.989051.19515.89 25-yr, 24-hr1275620.144867.8784852.169056.0815.71 50-yr, 24-hr1638725.464867.8784852.746072.0315.13 100-yr, 24-hr1851467.64867.8784853.069081.1814.81 Page 4 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) Future2-yr, 24-hr557934.5144859.8784850.958023.12316.92 10-yr, 24-hr1166400.484859.8784851.963051.19515.92 25-yr, 24-hr1275516.784859.8784852.085056.0815.79 50-yr, 24-hr1639536.264859.8784852.697072.0315.18 100-yr, 24-hr1850647.614859.8784853.347081.1814.53 Pre-Development2-yr, 24-hr241144.4844867.8784850.4709.99617.41 10-yr, 24-hr819286.0974867.8784851.382029.33816.5 25-yr, 24-hr925535.584867.8784851.526033.67116.35 50-yr, 24-hr1281315.584867.8784851.976048.3415.9 100-yr, 24-hr1488832.544867.8784852.264057.0115.61 H8 Existing2-yr, 24-hr04868.0664849.436018.63 10-yr, 24-hr04868.0664850.636017.43 25-yr, 24-hr04868.0664850.839017.23 50-yr, 24-hr04868.0664851.482016.58 100-yr, 24-hr04868.0664851.836016.23 Future2-yr, 24-hr04858.0664849.436018.63 10-yr, 24-hr04858.0664850.595017.47 25-yr, 24-hr04858.0664850.654017.41 50-yr, 24-hr04858.0664851.364016.7 100-yr, 24-hr04858.0664852.792015.27 Pre-Development2-yr, 24-hr04868.0664848.804019.26 10-yr, 24-hr04868.0664849.918018.15 25-yr, 24-hr04868.0664850.088017.98 50-yr, 24-hr04868.0664850.611017.45 100-yr, 24-hr04868.0664850.924017.14 BC3B Existing2-yr, 24-hr132061.59347874768.58505.57318.42 10-yr, 24-hr275123.58147874770.179012.23816.82 25-yr, 24-hr300846.71647874770.46013.38916.54 50-yr, 24-hr386179.12447874771.366017.13915.63 100-yr, 24-hr436172.21947874771.948019.28815.05 Future2-yr, 24-hr132073.56747774768.58505.57318.42 10-yr, 24-hr275178.09147774813.767420.812.238-26.77 25-yr, 24-hr300821.21347774794.055521.513.389-7.05 50-yr, 24-hr386370.34347774841.8291235.917.139-54.83 100-yr, 24-hr435978.00147774855.2471952.119.288-68.25 Pre-Development2-yr, 24-hr56926.88147874767.802.42619.2 10-yr, 24-hr192995.7447874769.20507.13617.79 25-yr, 24-hr217981.68847874769.43208.17917.57 50-yr, 24-hr301627.99847874770.14011.69216.86 100-yr, 24-hr350401.48247874770.58013.7616.42 3519Existing2-yr, 24-hr63471.144876.814877.664382.13.349-0.85 10-yr, 24-hr130740.9334876.814878.66984.16.576-1.85 25-yr, 24-hr142769.8384876.814878.7791236.17.097-1.97 50-yr, 24-hr182648.2334876.814879.1451917.38.791-2.33 100-yr, 24-hr205996.1424876.814879.3362137.59.766-2.53 Future2-yr, 24-hr63467.9974876.814877.668383.83.349-0.86 10-yr, 24-hr130772.7424876.814878.659980.16.576-1.85 25-yr, 24-hr142756.1334876.814878.7731221.77.097-1.96 50-yr, 24-hr182740.2194876.814879.1531920.88.791-2.34 100-yr, 24-hr205906.074876.814879.3212124.59.766-2.51 Pre-Development2-yr, 24-hr27966.334876.814876.9211091.65-0.11 10-yr, 24-hr92964.5264876.814878.357655.128-1.54 25-yr, 24-hr104737.6494876.814878.5178495.71-1.71 50-yr, 24-hr144053.8874876.814878.9221523.87.561-2.11 100-yr, 24-hr166900.8674876.814879.1231801.88.601-2.31 3518Existing2-yr, 24-hr04874.154874.21303.8-0.06 10-yr, 24-hr04874.154874.813974.8-0.66 25-yr, 24-hr04874.154874.9011069.6-0.75 50-yr, 24-hr04874.154875.1471936.8-1 100-yr, 24-hr04874.154875.3132194-1.16 Future2-yr, 24-hr04874.154874.211306.8-0.06 10-yr, 24-hr04874.154874.814969.4-0.66 Page 5 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 25-yr, 24-hr04874.154874.8991064.1-0.75 50-yr, 24-hr04874.154875.1551949.4-1 100-yr, 24-hr04874.154875.3022179-1.15 Pre-Development2-yr, 24-hr04874.154873.70800.44 10-yr, 24-hr04874.154874.598749.5-0.45 25-yr, 24-hr04874.154874.707849.5-0.56 50-yr, 24-hr04874.154874.9911372.5-0.84 100-yr, 24-hr04874.154875.1221812-0.97 3056Existing2-yr, 24-hr04857.324854.40802.91 10-yr, 24-hr04857.324854.55102.77 25-yr, 24-hr04857.324854.56802.75 50-yr, 24-hr04857.324854.63302.69 100-yr, 24-hr04857.324854.67402.65 Future2-yr, 24-hr04857.324854.40802.91 10-yr, 24-hr04857.324854.5502.77 25-yr, 24-hr04857.324854.57202.75 50-yr, 24-hr04857.324854.63302.69 100-yr, 24-hr04857.324854.66802.65 Pre-Development2-yr, 24-hr04857.324854.28303.04 10-yr, 24-hr04857.324854.50402.82 25-yr, 24-hr04857.324854.52802.79 50-yr, 24-hr04857.324854.59302.73 100-yr, 24-hr04857.324854.62702.69 3055Existing2-yr, 24-hr04856.744849.66407.08 10-yr, 24-hr04856.744849.66807.07 25-yr, 24-hr04856.744849.66907.07 50-yr, 24-hr04856.744849.6707.07 100-yr, 24-hr04856.744849.67207.07 Future2-yr, 24-hr04856.744849.66407.08 10-yr, 24-hr04856.744849.66807.07 25-yr, 24-hr04856.744849.66907.07 50-yr, 24-hr04856.744849.6707.07 100-yr, 24-hr04856.744849.67107.07 Pre-Development2-yr, 24-hr04856.744849.66107.08 10-yr, 24-hr04856.744849.66707.07 25-yr, 24-hr04856.744849.66807.07 50-yr, 24-hr04856.744849.66907.07 100-yr, 24-hr04856.744849.6707.07 2955Existing2-yr, 24-hr04840.214834.56105.65 10-yr, 24-hr04840.214834.56705.64 25-yr, 24-hr04840.214834.56805.64 50-yr, 24-hr04840.214834.5705.64 100-yr, 24-hr04840.214834.57205.64 Future2-yr, 24-hr04840.214834.56105.65 10-yr, 24-hr04840.214834.56705.64 25-yr, 24-hr04840.214834.56805.64 50-yr, 24-hr04840.214834.5705.64 100-yr, 24-hr04840.214834.57205.64 Pre-Development2-yr, 24-hr04840.214834.55605.65 10-yr, 24-hr04840.214834.56505.64 25-yr, 24-hr04840.214834.56605.64 50-yr, 24-hr04840.214834.56905.64 100-yr, 24-hr04840.214834.5705.64 3071Existing2-yr, 24-hr04836.184830.15906.02 10-yr, 24-hr04836.184830.16306.02 25-yr, 24-hr04836.184830.16306.02 50-yr, 24-hr04836.184830.16506.02 100-yr, 24-hr04836.184830.16606.01 Future2-yr, 24-hr04836.184830.15906.02 10-yr, 24-hr04836.184830.16306.02 25-yr, 24-hr04836.184830.16306.02 50-yr, 24-hr04836.184830.16506.02 Page 6 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 100-yr, 24-hr04836.184830.16606.01 Pre-Development2-yr, 24-hr04836.184830.15606.02 10-yr, 24-hr04836.184830.16106.02 25-yr, 24-hr04836.184830.16306.02 50-yr, 24-hr04836.184830.16406.02 100-yr, 24-hr04836.184830.16506.02 3072Existing2-yr, 24-hr04827.334821.35505.98 10-yr, 24-hr04827.334821.43505.89 25-yr, 24-hr04827.334821.4405.89 50-yr, 24-hr04827.334821.45705.87 100-yr, 24-hr04827.334821.46805.86 Future2-yr, 24-hr04827.334821.35505.98 10-yr, 24-hr04827.334821.43505.9 25-yr, 24-hr04827.334821.43905.89 50-yr, 24-hr04827.334821.45705.87 100-yr, 24-hr04827.334821.46605.86 Pre-Development2-yr, 24-hr04827.334821.35205.98 10-yr, 24-hr04827.334821.4205.91 25-yr, 24-hr04827.334821.42905.9 50-yr, 24-hr04827.334821.44605.88 100-yr, 24-hr04827.334821.45605.87 3075Existing2-yr, 24-hr04818.444813.8104.63 10-yr, 24-hr04818.444817.50200.94 25-yr, 24-hr04818.444817.59400.85 50-yr, 24-hr04818.444817.93200.51 100-yr, 24-hr04818.444818.12300.32 Future2-yr, 24-hr04818.444813.82404.62 10-yr, 24-hr04818.444817.49500.94 25-yr, 24-hr04818.444817.59100.85 50-yr, 24-hr04818.444817.92800.51 100-yr, 24-hr04818.444818.09600.34 Pre-Development2-yr, 24-hr04818.444812.72705.71 10-yr, 24-hr04818.444817.14601.29 25-yr, 24-hr04818.444817.3801.06 50-yr, 24-hr04818.444817.73100.71 100-yr, 24-hr04818.444817.92700.51 3062Existing2-yr, 24-hr04818.094813.6704.42 10-yr, 24-hr04818.094817.32800.76 25-yr, 24-hr04818.094817.42300.67 50-yr, 24-hr04818.094817.75800.33 100-yr, 24-hr04818.094817.95200.14 Future2-yr, 24-hr04818.094813.6804.41 10-yr, 24-hr04818.094817.32300.77 25-yr, 24-hr04818.094817.41700.67 50-yr, 24-hr04818.094817.75300.34 100-yr, 24-hr04818.094817.91900.17 Pre-Development2-yr, 24-hr04818.094813.0905 10-yr, 24-hr04818.094816.97401.12 25-yr, 24-hr04818.094817.21200.88 50-yr, 24-hr04818.094817.56200.53 100-yr, 24-hr04818.094817.75200.34 2956Existing2-yr, 24-hr68459.3614843.044838.53503.6824.5 10-yr, 24-hr140971.3744843.044844.002197.87.135-0.96 25-yr, 24-hr153932.6584843.044844.121225.57.692-1.08 50-yr, 24-hr196903.2614843.044844.609357.79.51-1.57 100-yr, 24-hr222059.1264843.044844.84644810.557-1.81 Future2-yr, 24-hr68454.9464843.044838.53403.6824.51 10-yr, 24-hr141006.1184843.044843.994196.87.135-0.95 25-yr, 24-hr153918.3554843.044844.135226.77.692-1.1 50-yr, 24-hr197002.6594843.044844.598354.59.51-1.56 100-yr, 24-hr221963.0164843.044844.825444.410.557-1.79 Pre-Development2-yr, 24-hr30242.964843.044838.2201.8244.82 Page 7 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 10-yr, 24-hr100430.624843.044843.469125.35.72-0.43 25-yr, 24-hr113123.84843.044843.734165.16.346-0.69 50-yr, 24-hr155505.1414843.044844.347286.78.331-1.31 100-yr, 24-hr180126.864843.044844.604358.39.445-1.56 3070Existing2-yr, 24-hr04833.224827.92505.3 10-yr, 24-hr04833.224828.1405.08 25-yr, 24-hr04833.224828.15405.07 50-yr, 24-hr04833.224828.22405 100-yr, 24-hr04833.224828.44204.78 Future2-yr, 24-hr04833.224827.92505.3 10-yr, 24-hr04833.224828.13905.08 25-yr, 24-hr04833.224828.15505.07 50-yr, 24-hr04833.224828.2205 100-yr, 24-hr04833.224828.2704.95 Pre-Development2-yr, 24-hr04833.224827.73505.49 10-yr, 24-hr04833.224828.08405.14 25-yr, 24-hr04833.224828.11705.1 50-yr, 24-hr04833.224828.18205.04 100-yr, 24-hr04833.224828.22205 3059Existing2-yr, 24-hr04823.784818.43605.34 10-yr, 24-hr04823.784822.3201.46 25-yr, 24-hr04823.784822.43101.35 50-yr, 24-hr04823.784822.86600.91 100-yr, 24-hr04823.784823.15500.62 Future2-yr, 24-hr04823.784818.43705.34 10-yr, 24-hr04823.784822.31101.47 25-yr, 24-hr04823.784822.43601.34 50-yr, 24-hr04823.784822.85500.92 100-yr, 24-hr04823.784823.07600.7 Pre-Development2-yr, 24-hr04823.784818.16405.62 10-yr, 24-hr04823.784821.82401.96 25-yr, 24-hr04823.784822.14801.63 50-yr, 24-hr04823.784822.61301.17 100-yr, 24-hr04823.784822.86800.91 3073Existing2-yr, 24-hr04823.144818.4304.71 10-yr, 24-hr04823.144822.3200.82 25-yr, 24-hr04823.144822.43300.71 50-yr, 24-hr04823.144822.86600.27 100-yr, 24-hr04823.144823.145113.5-0.01 Future2-yr, 24-hr04823.144818.4304.71 10-yr, 24-hr04823.144822.31200.83 25-yr, 24-hr04823.144822.43600.7 50-yr, 24-hr04823.144822.85600.28 100-yr, 24-hr04823.144823.07600.06 Pre-Development2-yr, 24-hr04823.144818.16404.98 10-yr, 24-hr04823.144821.8201.32 25-yr, 24-hr04823.144822.14800.99 50-yr, 24-hr04823.144822.61500.52 100-yr, 24-hr04823.144822.86800.27 3074Existing2-yr, 24-hr04817.24813.63403.57 10-yr, 24-hr04817.24817.326150-0.13 25-yr, 24-hr04817.24817.418186.5-0.22 50-yr, 24-hr04817.24817.755333-0.55 100-yr, 24-hr04817.24817.945432.5-0.74 Future2-yr, 24-hr04817.24813.64603.55 10-yr, 24-hr04817.24817.319148-0.12 25-yr, 24-hr04817.24817.415187.8-0.21 50-yr, 24-hr04817.24817.751333.6-0.55 100-yr, 24-hr04817.24817.918431.1-0.72 Pre-Development2-yr, 24-hr04817.24810.90506.29 10-yr, 24-hr04817.24816.97100.23 25-yr, 24-hr04817.24817.20543.70 Page 8 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 50-yr, 24-hr04817.24817.555253.9-0.35 100-yr, 24-hr04817.24817.75340.7-0.55 3076Existing2-yr, 24-hr30696.4184813.744811.70201.6842.04 10-yr, 24-hr63189.6074813.744814.714237.63.216-0.97 25-yr, 24-hr68995.2454813.744814.831273.43.464-1.09 50-yr, 24-hr88243.6314813.744815.1634344.274-1.42 100-yr, 24-hr99510.7364813.744815.3045434.742-1.56 Future2-yr, 24-hr30693.9364813.744811.71101.6842.03 10-yr, 24-hr63205.3764813.744814.708236.33.216-0.97 25-yr, 24-hr68989.1214813.744814.827274.33.464-1.09 50-yr, 24-hr88288.2914813.744815.164434.74.274-1.42 100-yr, 24-hr99468.2034813.744815.297541.24.742-1.56 Pre-Development2-yr, 24-hr13595.9654813.744809.34300.8714.4 10-yr, 24-hr45107.7214813.744814.324149.52.652-0.58 25-yr, 24-hr50796.7744813.744814.533196.82.931-0.79 50-yr, 24-hr69788.6144813.744814.965339.93.813-1.23 100-yr, 24-hr80819.1494813.744815.148431.54.309-1.41 3078Existing2-yr, 24-hr04811.664808.35903.3 10-yr, 24-hr04811.664811.10200.56 25-yr, 24-hr04811.664811.14300.52 50-yr, 24-hr04811.664811.42600.23 100-yr, 24-hr04811.664811.53600.12 Future2-yr, 24-hr04811.664808.36503.3 10-yr, 24-hr04811.664811.09900.56 25-yr, 24-hr04811.664811.14500.52 50-yr, 24-hr04811.664811.4800.18 100-yr, 24-hr04811.664811.58100.08 Pre-Development2-yr, 24-hr04811.664806.7604.9 10-yr, 24-hr04811.664810.33401.33 25-yr, 24-hr04811.664810.61901.04 50-yr, 24-hr04811.664811.16500.5 100-yr, 24-hr04811.664811.34800.31 3520Existing2-yr, 24-hr04811.44808.35803.04 10-yr, 24-hr04811.44811.09800.3 25-yr, 24-hr04811.44811.14200.26 50-yr, 24-hr04811.44811.42449.3-0.02 100-yr, 24-hr04811.44811.535127.6-0.13 Future2-yr, 24-hr04811.44808.36403.04 10-yr, 24-hr04811.44811.09700.3 25-yr, 24-hr04811.44811.14300.26 50-yr, 24-hr04811.44811.43980.4-0.04 100-yr, 24-hr04811.44811.577139.1-0.18 Pre-Development2-yr, 24-hr04811.44806.61404.79 10-yr, 24-hr04811.44810.33401.07 25-yr, 24-hr04811.44810.61600.78 50-yr, 24-hr04811.44811.16400.24 100-yr, 24-hr04811.44811.34700.05 3077Existing2-yr, 24-hr04811.094808.35702.73 10-yr, 24-hr04811.094811.09411.80 25-yr, 24-hr04811.094811.1446.6-0.05 50-yr, 24-hr04811.094811.423154.1-0.33 100-yr, 24-hr04811.094811.552214-0.46 Future2-yr, 24-hr04811.094808.36202.73 10-yr, 24-hr04811.094811.09410.80 25-yr, 24-hr04811.094811.13947.1-0.05 50-yr, 24-hr04811.094811.448163-0.36 100-yr, 24-hr04811.094811.599226.7-0.51 Pre-Development2-yr, 24-hr04811.094806.61404.48 10-yr, 24-hr04811.094810.33100.76 25-yr, 24-hr04811.094810.61100.48 50-yr, 24-hr04811.094811.16288.5-0.07 100-yr, 24-hr04811.094811.345146.9-0.26 Page 9 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 3067Existing2-yr, 24-hr04810.554806.57203.98 10-yr, 24-hr04810.554809.34601.2 25-yr, 24-hr04810.554809.48601.06 50-yr, 24-hr04810.554809.99800.55 100-yr, 24-hr04810.554810.11900.43 Future2-yr, 24-hr04810.554806.57503.98 10-yr, 24-hr04810.554809.34301.21 25-yr, 24-hr04810.554809.47901.07 50-yr, 24-hr04810.554810.01900.53 100-yr, 24-hr04810.554810.15800.39 Pre-Development2-yr, 24-hr04810.554805.66204.89 10-yr, 24-hr04810.554808.37902.17 25-yr, 24-hr04810.554808.73101.82 50-yr, 24-hr04810.554809.54601 100-yr, 24-hr04810.554809.8500.7 3066Existing2-yr, 24-hr04810.234804.72705.5 10-yr, 24-hr04810.234807.49702.73 25-yr, 24-hr04810.234807.75202.48 50-yr, 24-hr04810.234808.51601.71 100-yr, 24-hr04810.234808.6801.55 Future2-yr, 24-hr04810.234804.72805.5 10-yr, 24-hr04810.234807.49602.73 25-yr, 24-hr04810.234807.74102.49 50-yr, 24-hr04810.234808.54501.68 100-yr, 24-hr04810.234808.74301.49 Pre-Development2-yr, 24-hr04810.234804.4605.77 10-yr, 24-hr04810.234806.32703.9 25-yr, 24-hr04810.234806.74903.48 50-yr, 24-hr04810.234807.88402.35 100-yr, 24-hr04810.234808.40201.83 3068Existing2-yr, 24-hr57056.9594807.54803.12702.9334.37 10-yr, 24-hr113644.6124807.54806.26505.5691.23 25-yr, 24-hr123743.8714807.54806.583060.92 50-yr, 24-hr157251.3054807.54807.52720.87.411-0.03 100-yr, 24-hr176860.0274807.54807.7261.58.226-0.22 Future2-yr, 24-hr57053.2934807.54803.12802.9334.37 10-yr, 24-hr113671.6184807.54806.25505.5691.24 25-yr, 24-hr123731.9254807.54806.574060.93 50-yr, 24-hr157329.6774807.54807.56532.97.411-0.07 100-yr, 24-hr176784.1034807.54807.80275.18.226-0.3 Pre-Development2-yr, 24-hr23413.7184807.54802.76301.374.74 10-yr, 24-hr77861.7494807.54804.94904.2452.55 25-yr, 24-hr87729.3434807.54805.41804.7332.08 50-yr, 24-hr120684.2174807.54806.77106.2860.73 100-yr, 24-hr139836.424807.54807.43307.1590.07 2965Existing2-yr, 24-hr04804.994800.16604.82 10-yr, 24-hr04804.994801.45203.54 25-yr, 24-hr04804.994801.57103.42 50-yr, 24-hr04804.994801.96703.02 100-yr, 24-hr04804.994802.0302.96 Future2-yr, 24-hr04804.994800.16504.82 10-yr, 24-hr04804.994801.44403.55 25-yr, 24-hr04804.994801.57103.42 50-yr, 24-hr04804.994802.3602.63 100-yr, 24-hr04804.994802.60202.39 Pre-Development2-yr, 24-hr04804.994799.7805.21 10-yr, 24-hr04804.994800.9104.08 25-yr, 24-hr04804.994801.10303.89 50-yr, 24-hr04804.994801.64903.34 100-yr, 24-hr04804.994801.91203.08 2964Existing2-yr, 24-hr04803.514797.96205.55 10-yr, 24-hr04803.514798.13805.37 Page 10 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 25-yr, 24-hr04803.514798.15505.35 50-yr, 24-hr04803.514798.31105.2 100-yr, 24-hr04803.514798.38605.12 Future2-yr, 24-hr04803.514797.96205.55 10-yr, 24-hr04803.514798.17105.34 25-yr, 24-hr04803.514798.33405.18 50-yr, 24-hr04803.514799.15804.35 100-yr, 24-hr04803.514799.40204.11 Pre-Development2-yr, 24-hr04803.514797.74505.77 10-yr, 24-hr04803.514798.07205.44 25-yr, 24-hr04803.514798.09605.41 50-yr, 24-hr04803.514798.16305.35 100-yr, 24-hr04803.514798.26305.25 2845Existing2-yr, 24-hr04795.024791.45903.56 10-yr, 24-hr04795.024791.68103.34 25-yr, 24-hr04795.024791.71203.31 50-yr, 24-hr04795.024792.79502.23 100-yr, 24-hr04795.024793.14801.87 Future2-yr, 24-hr04795.024791.45903.56 10-yr, 24-hr04795.024792.92502.09 25-yr, 24-hr04795.024793.55601.46 50-yr, 24-hr04795.024794.4800.54 100-yr, 24-hr04795.024794.74700.27 Pre-Development2-yr, 24-hr04795.024791.2103.81 10-yr, 24-hr04795.024791.59303.43 25-yr, 24-hr04795.024791.62403.4 50-yr, 24-hr04795.024791.74603.27 100-yr, 24-hr04795.024792.55602.46 3527Existing2-yr, 24-hr04808.724789.661019.06 10-yr, 24-hr04808.724789.883018.84 25-yr, 24-hr04808.724789.942018.78 50-yr, 24-hr04808.724790.929017.79 100-yr, 24-hr04808.724791.247017.47 Future2-yr, 24-hr04808.724789.661019.06 10-yr, 24-hr04808.724791.492017.23 25-yr, 24-hr04808.724791.914016.81 50-yr, 24-hr04808.724792.784015.94 100-yr, 24-hr04808.724793.065015.65 Pre-Development2-yr, 24-hr04808.724789.411019.31 10-yr, 24-hr04808.724789.796018.92 25-yr, 24-hr04808.724789.827018.89 50-yr, 24-hr04808.724790.063018.66 100-yr, 24-hr04808.724790.738017.98 2867Existing2-yr, 24-hr04792.044786.82805.21 10-yr, 24-hr04792.044788.67903.36 25-yr, 24-hr04792.044788.92903.11 50-yr, 24-hr04792.044789.8102.23 100-yr, 24-hr04792.044790.10101.94 Future2-yr, 24-hr04792.044786.82905.21 10-yr, 24-hr04792.044790.76701.27 25-yr, 24-hr04792.044791.07200.97 50-yr, 24-hr04792.044791.76500.28 100-yr, 24-hr04792.044792.06643.7-0.03 Pre-Development2-yr, 24-hr04792.044786.55405.49 10-yr, 24-hr04792.044787.54504.5 25-yr, 24-hr04792.044788.05503.99 50-yr, 24-hr04792.044789.11502.93 100-yr, 24-hr04792.044789.64202.4 Pre-Development2-yr, 24-hr04803.0184784.769018.25 10-yr, 24-hr04803.0184787.198015.82 25-yr, 24-hr04803.0184787.594015.42 50-yr, 24-hr04803.0184788.857014.16 Page 11 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 100-yr, 24-hr04803.0184789.681013.34 Pre-Development2-yr, 24-hr04739.754722.747017 10-yr, 24-hr04739.754733.58406.17 25-yr, 24-hr04739.754739.784.4-0.03 50-yr, 24-hr04739.754745.697269.7-5.95 100-yr, 24-hr04739.754746.478403.8-6.73 Pre-Development2-yr, 24-hr04895.1854875.185020 10-yr, 24-hr04895.1854875.185020 25-yr, 24-hr04895.1854875.185020 50-yr, 24-hr04895.1854875.185020 100-yr, 24-hr04895.1854875.185020 Pre-Development2-yr, 24-hr04711.8934696.202015.69 10-yr, 24-hr04711.8934717.5265.2-5.61 25-yr, 24-hr04711.8934718.244384.5-6.35 50-yr, 24-hr04711.8934719.452729.2-7.56 100-yr, 24-hr04711.8934719.822879.2-7.93 Future2-yr, 24-hr3299947.424740.144731.163087.23218.98 10-yr, 24-hr6738085.444740.144783.674155.7189.1-33.53 25-yr, 24-hr7373652.524740.144794.016196.4207.89-43.88 50-yr, 24-hr9502917.894740.144846.375313.3282.73-96.23 100-yr, 24-hr1.07E+074740.144891.222414.4327.448-141.08 Pre-Development2-yr, 24-hr907785.9694750.144730.602024.11619.54 10-yr, 24-hr3897983.924750.144731.172088.59418.97 25-yr, 24-hr4487895.494750.144731.2690102.18418.87 50-yr, 24-hr6489265.434750.144731.5770149.9718.56 100-yr, 24-hr7671653.84750.144731.7490179.318.39 Future2-yr, 24-hr759810.4684635.554632.303028.93210.25 10-yr, 24-hr1741155.684635.554761.867512.970.31-119.31 25-yr, 24-hr1923275.934635.554771.496595.678.103-128.94 50-yr, 24-hr2531123.194635.554831.0271267.6104.097-188.47 100-yr, 24-hr2884652.54635.554876.1081719.2119.254-233.55 Pre-Development2-yr, 24-hr340765.9024642.5544629.587013.03812.97 10-yr, 24-hr1267526.894642.5544647.188301.942.944-4.63 25-yr, 24-hr1444412.44642.5544647.706426.948.477-5.15 50-yr, 24-hr2038860.734642.5544648.607768.567.571-6.05 100-yr, 24-hr2386765.094642.5544648.927919.780.837-6.37 Pre-Development2-yr, 24-hr04643.4354627.805015.63 10-yr, 24-hr04643.4354645.643290.9-2.21 25-yr, 24-hr04643.4354646.158412.3-2.72 50-yr, 24-hr04643.4354647.051761.9-3.62 100-yr, 24-hr04643.4354647.368913.5-3.93 Future2-yr, 24-hr05442.2425432.242020 10-yr, 24-hr05442.2425432.242020 25-yr, 24-hr05442.2425432.242020 50-yr, 24-hr05442.2425432.242020 100-yr, 24-hr05442.2425432.242020 Pre-Development2-yr, 24-hr05452.2425432.242020 10-yr, 24-hr05452.2425432.242020 25-yr, 24-hr05452.2425432.242020 50-yr, 24-hr05452.2425432.242020 100-yr, 24-hr05452.2425432.242020 Pre-Development2-yr, 24-hr1301347.74644.6444625.483044.48219.16 10-yr, 24-hr5078022.154644.6444626.4870156.90618.16 25-yr, 24-hr5824038.034644.6444626.6450178.84118 50-yr, 24-hr8342986.634644.6444627.140252.93117.5 100-yr, 24-hr9822842.654644.6444627.4080296.58417.24 Future2-yr, 24-hr41057.1274629.5064620.52402.73318.98 10-yr, 24-hr121000.414629.5064718.585427.17.104-79.08 25-yr, 24-hr135307.5174629.5064732.853482.17.774-93.35 50-yr, 24-hr182709.5554629.5064796.8786269.909-157.37 100-yr, 24-hr210280.7524629.5064844.8951056.511.117-205.39 Future2-yr, 24-hr1653489.734634.0844624.902061.19519.18 Page 12 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 10-yr, 24-hr5080979.534634.0844718.62415.8184.297-74.54 25-yr, 24-hr5755853.054634.0844733.55458.2210.023-89.47 50-yr, 24-hr8012394.54634.0844796.881567.6298.195-152.8 100-yr, 24-hr9332440.764634.0844844.8261008.5350.896-200.74 Pre-Development2-yr, 24-hr1227563.254644.0844624.795048.84519.29 10-yr, 24-hr4586891.324644.0844625.5930162.36418.49 25-yr, 24-hr5253040.064644.0844625.7140183.3118.37 50-yr, 24-hr7496706.64644.0844626.10256.91517.98 100-yr, 24-hr8811203.44644.0844626.3480307.22617.74 Pre-Development2-yr, 24-hr04627.1554608.311018.84 10-yr, 24-hr04627.1554611.449015.71 25-yr, 24-hr04627.1554611.937015.22 50-yr, 24-hr04627.1554613.243013.91 100-yr, 24-hr04627.1554613.875013.28 H2 Existing2-yr, 24-hr04604.1884592.814011.37 10-yr, 24-hr04604.1884610.88725.7-6.69 25-yr, 24-hr04604.1884611.06821.9-6.87 50-yr, 24-hr04604.1884611.4991126-7.31 100-yr, 24-hr04604.1884611.7251753.3-7.54 Future2-yr, 24-hr04594.1884591.701012.49 10-yr, 24-hr04594.1884717.581528.8-113.39 25-yr, 24-hr04594.1884731.618610.4-127.43 50-yr, 24-hr04594.1884794.4871225.7-190.3 100-yr, 24-hr04594.1884841.6311552.3-237.44 Future2-yr, 24-hr4628178.344519.0734517.0440134.11512.03 10-yr, 24-hr1.84E+074519.0734598.647532.4472.14-69.57 25-yr, 24-hr2.11E+074519.0734610.859613.4541.452-81.79 50-yr, 24-hr3.03E+074519.0734655.0771194.7781.661-126 100-yr, 24-hr3.56E+074519.0734693.1611436.3926.902-164.09 Pre-Development2-yr, 24-hr4351289.444529.0734513.9860125.75615.09 10-yr, 24-hr1.81E+074529.0734535.171499.8460.163-6.1 25-yr, 24-hr2.08E+074529.0734535.551625.3529.03-6.48 50-yr, 24-hr2.99E+074529.0734536.343962.3768.082-7.27 100-yr, 24-hr3.53E+074529.0734536.651142912.842-7.58 EG7H Existing2-yr, 24-hr5554107.074501.4024482.6110143.44718.79 10-yr, 24-hr1.38E+074501.4024485.5990346.86415.8 25-yr, 24-hr1.56E+074501.4024486.2830388.25415.12 50-yr, 24-hr2.16E+074501.4024490.1870532.69811.21 100-yr, 24-hr2.52E+074501.4024503.452202.6620.313-2.05 Pre-Development2-yr, 24-hr1570711.414501.4024481.914044.77919.49 10-yr, 24-hr8215668.924501.4024483.3860165.32918.02 25-yr, 24-hr9832435.174501.4024483.8510193.1117.55 50-yr, 24-hr1.55E+074501.4024485.4660294.34315.94 100-yr, 24-hr1.89E+074501.4024486.8310358.7414.57 EG7B Existing2-yr, 24-hr2347926.814859.3824840.149063.57619.23 10-yr, 24-hr7971576.074859.3824840.9150192.16218.47 25-yr, 24-hr9048087.154859.3824841.0450218.43118.34 50-yr, 24-hr1.27E+074859.3824841.4610309.55717.92 100-yr, 24-hr1.48E+074859.3824841.6320364.77817.75 Future2-yr, 24-hr2348353.894849.3824840.149063.57619.23 10-yr, 24-hr7972199.094849.3824840.9140192.16218.47 25-yr, 24-hr9048527.174849.3824841.0450218.43118.34 50-yr, 24-hr1.27E+074849.3824841.4610309.55717.92 100-yr, 24-hr1.48E+074849.3824841.6740364.77817.71 EG7G Existing2-yr, 24-hr2695225.034868.5954849.478080.5519.12 10-yr, 24-hr7017153.344868.5954850.2020209.37618.39 25-yr, 24-hr7984065.334868.5954850.3260235.26818.27 50-yr, 24-hr1.14E+074868.5954850.7370328.59117.86 100-yr, 24-hr1.34E+074868.5954850.9790387.83317.62 Future2-yr, 24-hr2695665.824858.5954849.478080.5519.12 10-yr, 24-hr7017927.214858.5954850.2010209.37618.39 25-yr, 24-hr7984397.344858.5954850.3250235.26818.27 Page 13 of 14 NodeMax. CrownMax. WaterDuration ofMax. FlowFreeboard NameScenario Storm Inflow (ft3) ElevationElevationFlooding (min.) Rate (cfs)(ft) 50-yr, 24-hr1.14E+074858.5954850.7360328.59117.86 100-yr, 24-hr1.34E+074858.5954850.9790387.83317.62 Pre-Development2-yr, 24-hr753469.6594868.5954849.02024.71119.57 10-yr, 24-hr4260151.874868.5954849.7060116.86618.89 25-yr, 24-hr5154999.614868.5954849.8250137.35218.77 50-yr, 24-hr8374012.734868.5954850.210211.29718.38 100-yr, 24-hr1.03E+074868.5954850.4280257.68818.17 EG7C Existing2-yr, 24-hr3150156.744499.1954482.3076.90516.89 10-yr, 24-hr1.23E+074499.1954485.8270224.94813.37 25-yr, 24-hr1.41E+074499.1954486.4980256.54712.7 50-yr, 24-hr2.03E+074499.1954490.3980369.4328.8 100-yr, 24-hr2.39E+074499.1954503.651217.7440.031-4.46 Future2-yr, 24-hr3150671.344489.1954482.3076.90516.9 10-yr, 24-hr1.23E+074489.1954485.2010224.94813.99 25-yr, 24-hr1.41E+074489.1954485.730256.54713.46 50-yr, 24-hr2.03E+074489.1954487.4950369.43211.7 100-yr, 24-hr2.39E+074489.1954509.59728.7440.031-10.4 Pre-Development2-yr, 24-hr2403091.854499.1954481.172053.00518.02 10-yr, 24-hr1.13E+074499.1954483.7530190.10215.44 25-yr, 24-hr1.31E+074499.1954484.2280218.66614.97 50-yr, 24-hr1.92E+074499.1954485.8290320.18213.37 100-yr, 24-hr2.29E+074499.1954487.1380386.72412.06 H17 Existing2-yr, 24-hr04499.0794482.083017 10-yr, 24-hr04499.0794485.645013.43 25-yr, 24-hr04499.0794486.319012.76 50-yr, 24-hr04499.0794490.19308.89 100-yr, 24-hr04499.0794503.388217.8-4.31 Future2-yr, 24-hr04489.0794482.083017 10-yr, 24-hr04489.0794484.947014.13 25-yr, 24-hr04489.0794485.473013.61 50-yr, 24-hr04489.0794487.229011.85 100-yr, 24-hr04489.0794509.2327.7-10.15 Pre-Development2-yr, 24-hr04499.0794480.882018.2 10-yr, 24-hr04499.0794483.425015.65 25-yr, 24-hr04499.0794483.899015.18 50-yr, 24-hr04499.0794485.5013.58 100-yr, 24-hr04499.0794486.857012.22 H15 Existing2-yr, 24-hr04433.8924418.267015.63 10-yr, 24-hr04433.8924418.301015.59 25-yr, 24-hr04433.8924418.417015.47 50-yr, 24-hr04433.8924419.486014.41 100-yr, 24-hr04433.8924419.621014.27 Future2-yr, 24-hr04423.8924419.464014.43 10-yr, 24-hr04423.8924421.786012.11 25-yr, 24-hr04423.8924422.008011.88 50-yr, 24-hr04423.8924422.77011.12 100-yr, 24-hr0.0014423.8924423.274010.62 Pre-Development2-yr, 24-hr04433.8924417.419016.47 10-yr, 24-hr04433.8924420.266013.63 25-yr, 24-hr04433.8924420.277013.61 50-yr, 24-hr04433.8924420.299013.59 100-yr, 24-hr0.0014433.8924420.307013.59 Page 14 of 14 Bozeman Storm Water Facilities Plan Appendix C-3: Links, Input Data XP SWMM - LINKS, INPUT DATA Length Diameter/BottomConduitManning's nUpstreamDownstream Name(ft)Height (ft) Shape Width (ft) Slope (%) (Roughness) Invert Elev. Invert Elev. L-EG7S-7L 16688.610.00Rectangular200.800.0304602.4944469.227 L-EG7L-H16 195.6210.00Rectangular200.510.0304470.2274469.227 L-EG7K-7F 22054.110.00Rectangular200.680.0304618.1914469.227 L-EG7F-H16 259.22710.00Rectangular200.390.0304470.2274469.227 L-H16-H15 9944.20310.00Rectangular200.560.0304469.2274413.892 L-EG5Q-5P 17969.710.00Rectangular201.040.0304840.9834653.298 L-EG5P-6B 964.81410.00Rectangular200.800.0304653.2984645.612 L-EG6B-H3 2903.02710.00Rectangular201.320.0304645.6124607.295 L-EG5E-H4 52.10210.00Rectangular201.170.0304624.0454623.435 L-EG4B-H7 3749.77210.00Rectangular201.350.0304713.0984662.651 L-BC2F-H8 102.07510.00Rectangular201.540.0304849.644848.066 L-BC1A-2B 15903.110.00Rectangular200.960.0305000.2014847.878 L-BC2C-2A 12401.310.00Rectangular201.400.0305061.3144888.172 L-BC2A-H14 1252.27210.00Rectangular200.800.0304888.1724878.136 L-BC2E-H14 1322.85310.00Rectangular200.680.0304887.1874878.136 L-H14-BC2B 2761.82310.00Rectangular201.100.0304878.1364847.878 L-BC2B-H8 66.00310.00Rectangular202.750.0304849.8784848.066 H8_BC3B 416110.00Rectangular201.950.0304848.0664767 BC3B_2488 49.610.00Rectangular202.020.03047674766 3519_3518 610.50Circular02.130.0134866.394865.09 3518_3056 3450.50Circular03.680.0134865.054852.37 3056_3055 329.950.67Circular00.900.0134852.34849.33 3055_2955 387.170.67Circular03.930.0134849.294834.06 2955_3071 418.340.83Circular00.980.0134834.064829.96 3071_3072 351.090.83Circular02.480.0134829.784821.08 3072_3075 362.60.83Circular02.350.0134820.974812.46 3075_3074 357.941.25Circular00.610.0134812.274810.1 3062_3074 410.230.67Circular00.700.0134813.094810.2 2956_3070 4120.83Circular02.510.0134837.794827.44 3070_3073 3571.00Circular02.660.0134827.354817.85 3059_3073 397.040.67Circular00.060.0134818.074817.84 3073_3074 3531.00Circular01.870.0134817.744811.15 3074_3076 3561.25Circular00.400.0134810.044808.6 3076_3077 359.31.25Circular00.820.0134808.574805.64 3078_3520 1700.83Circular00.290.0134806.764806.26 3520_3077 1840.83Circular00.300.0134806.264805.71 3077_3067 190.51.25Circular00.490.0134805.684804.75 3067_3066 2001.25Circular00.530.0134804.754803.69 3066_3068 3521.50Circular00.460.0134803.634802.02 3068_2965 383.881.50Circular00.820.0134801.954798.79 2965_2964 233.771.50Circular00.740.0134798.944797.21 2964_2845 341.271.50Circular01.930.0134797.114790.52 2845_3527 1251.50Circular01.440.0134790.524788.72 3527_2867 751.50Circular01.440.0134788.724787.64 2867_3151 302.51.67Circular00.830.0134785.794783.29 3054_3038 176.580.67Circular00.450.0134854.84854 3038_3529 1400.67Circular02.190.0134853.844850.78 3529_2957 247.160.67Circular03.940.0134850.784841.03 2957_3058 4130.67Circular03.150.0134840.834827.83 3058_3060 3600.75Circular02.280.0134827.684819.46 3060_3061 3600.75Circular01.450.0134819.364814.13 3061_3064 3600.83Circular01.510.0134813.684808.24 3063_3064 201.810.83Circular00.550.0134809.464808.35 3064_3065 3600.83Circular00.590.0134808.054805.93 3065_3069 3601.00Circular00.630.0134805.854803.58 Page 1 of 3 Length Diameter/BottomConduitManning's nUpstreamDownstream Name(ft)Height (ft) Shape Width (ft) Slope (%) (Roughness) Invert Elev. Invert Elev. 3069_3109 3321.00Circular01.210.0134802.934798.9 2958_3104 4070.67Circular02.470.0134838.564828.49 3104_3105 3600.75Circular03.570.0134828.494815.62 3105_3106 3590.75Circular01.110.0134815.564811.56 3106_3107 3590.83Circular01.360.0134811.64806.7 3107_3108 3610.83Circular01.100.0134806.744802.77 3108_3109 3590.83Circular01.220.0134802.874798.49 3109_2963 3671.50Circular02.350.0134798.174789.56 2963_2803 3231.50Circular00.710.0134789.534787.24 2803_3528 1001.50Circular01.530.0134787.154785.62 3528_3151 1451.50Circular01.540.0134785.624783.39 3151_3150 361.92.25Circular00.290.0134782.544781.49 2780_2779 3900.50Circular01.410.0134845.314839.82 2779_2778 4080.67Circular01.230.0134839.724834.69 2778_2777 356.040.67Circular04.330.0134834.694819.27 2777_2776 3600.67Circular02.460.0134819.244810.39 2776_2775 3600.83Circular01.750.0134810.364804.07 2775_2774 3740.83Circular00.650.0134803.854801.42 2774_2769 3530.83Circular01.180.0134801.384797.2 2769_2768 3681.00Circular01.440.0134797.034791.74 2768_3152 165.711.00Circular01.040.0134791.744790.01 3152_2804 141.11.00Circular00.960.0134789.934788.57 2804_3150 247.721.00Circular02.810.0134788.524781.57 2891_3150 1670.67Circular00.290.0134782.334781.85 3150_3149 335.92.25Circular00.380.0134781.574780.28 3149_3148 48.62.25Circular00.800.0134780.264779.87 3111_3112 224.770.75Circular04.000.0134818.974809.97 3112_3113 132.890.75Circular02.200.0134809.874806.95 3113_3114 362.610.75Circular01.340.0134806.774801.91 3114_3115 362.620.75Circular00.780.0134801.884799.04 3115_3110 357.630.83Circular01.100.0134798.924794.98 3110_2962 374.040.83Circular00.900.0134794.984791.63 2962_3521 313.281.00Circular00.690.0134791.674789.5 3521_3148 258.071.00Circular01.580.0134789.354785.28 3148_3147 3452.50Circular00.140.0134779.814779.34 3119_3118 4290.83Circular01.350.0134809.544803.75 3118_3117 4280.83Circular01.020.0134803.734799.36 3117_3116 3620.83Circular01.040.0134798.34794.55 3116_2961 359.310.83Circular01.360.0134794.544789.67 2961_3153 185.611.00Circular00.430.0134789.524788.72 3153_3522 1001.00Circular00.500.0134788.524788.02 3522_2805 57.671.00Circular00.500.0134788.024787.73 2805_3147 232.961.00Circular01.300.0134787.644784.61 2890_3147 183.760.83Circular00.880.0134781.34779.69 3147_3146 359.72.75Circular00.550.0134778.994777 3120_2960 3560.83Circular00.930.0134794.214790.9 2960_1143 3231.00Circular00.780.0134790.764788.25 1143_3146 254.281.00Circular01.160.0134788.314785.35 3146_2799 564.23.00Circular00.150.0134776.624775.79 2799_2800 27.853.25Circular00.470.0134775.744775.61 3526_3292 4400.67Circular01.380.0134805.854799.77 3292_3291 4440.67Circular01.330.0134799.744793.82 3291_3290 3511.00Circular00.790.0134793.774791.01 3290_3289 3711.00Circular00.870.0134791.014787.77 3289_3524 1781.00Circular00.250.0134787.74787.25 3525_3524 2001.00Circular00.140.0134787.634787.34 3524_3523 1311.00Circular00.330.0134787.174786.74 3523_2798 2601.00Circular01.000.0134786.744784.13 Page 2 of 3 Length Diameter/BottomConduitManning's nUpstreamDownstream Name(ft)Height (ft) Shape Width (ft) Slope (%) (Roughness) Invert Elev. Invert Elev. 2798_2801 4151.00Circular00.960.0134783.454779.48 1138_2801 259.21.00Circular01.150.0134787.214784.23 2801_2800 33.21.25Circular01.600.0134779.124778.59 2800_3459 562.353.25Circular00.510.0134775.534772.68 3459_2894 2033.25Circular01.450.0134772.644769.69 2894_3530 502.50Circular00.920.0134769.694769.23 3530_2488 3262.50Circular00.850.0134769.234766.45 2488_BC3A 3433.310.00Rectangular200.670.03047664743 L-BC3A-H11 3572.65510.00Rectangular200.650.03047434719.75 L-EG1D-1C 4719.82710.00Rectangular200.640.0304813.2634783.164 L-EG1C-H10 372.19510.00Rectangular200.040.0304783.1644783.018 L-EG1G-H12 3178.22610.00Rectangular200.550.0304804.3434786.727 L-EG1B-1A 6521.02110.00Rectangular202.000.0304956.5184825.95 L-EG1A-H9 3369.38810.00Rectangular200.920.0304825.954795.031 L-EG1F-H9 236.59910.00Rectangular200.810.0304796.9364795.031 L-H9-EG1E 1310.06510.00Rectangular200.010.0304801.0314800.868 L-EG1E-H12 315.1510.00Rectangular204.490.0304800.8684786.727 L-H12-H10 568.97910.00Rectangular200.650.0304786.7274783.018 L-H10-H18 3324.09110.00Rectangular200.720.0304783.0184759.167 L-EG2B-H18 258.97810.00Rectangular200.060.0304759.3154759.167 L-H18-H11 5757.83210.00Rectangular200.680.0304759.1674719.75 L-H11-EG2D 6205.29510.00Rectangular200.410.0304719.754694.245 L-EG2D-H6 183.03710.00Rectangular201.290.0304694.2454691.893 L-EG2A-2C 136.49410.00Rectangular207.560.0304804.4364794.111 L-H19-EG2C 6493.9210.00Rectangular201.250.0304875.1854794.111 L-EG2C-2E 9988.80710.00Rectangular201.000.0304794.1114693.941 L-EG2E-H6 179.49310.00Rectangular201.140.0304693.9414691.893 L-H6-H7 11418.910.00Rectangular200.260.0304691.8934662.651 L-H7-EG3A 1301.69110.00Rectangular200.280.0304662.6514659.014 L-EG3A-4C 774.210.00Rectangular200.050.0304660.0144659.589 L-EG5B-4A 6830.92910.00Rectangular200.810.0304730.144674.5 L-EG4A-4C 1508.01510.00Rectangular200.990.0304674.54659.589 L-EG4C-5G 7259.81810.00Rectangular200.510.0304659.5894622.554 L-EG5G-H4 400.910.00Rectangular200.000.0304625.554624.05 L-H4-H3 337210.00Rectangular200.000.0304624.054607.3 L-H3-H2 5327.14610.00Rectangular200.430.0304607.2954584.188 L-H13-GT1A 2329410.00Rectangular203.470.0305432.2424624.644 L-EGT1A-1B 1117.54910.00Rectangular200.460.0304624.6444619.506 L-EGT1B-H1 1823.86910.00Rectangular200.680.0304619.5064607.155 L-EGT2A-H1 2061.97810.00Rectangular200.820.0304624.0844607.155 L-H1-H2 3629.25410.00Rectangular200.630.0304607.1554584.188 L-H2-EG6A 15296.810.00Rectangular200.490.0304584.1884509.073 L-EG6A-H15 14638.310.00Rectangular50.650.0304509.0734413.892 L-EG7H-H17 114.76510.00Rectangular202.020.0304481.4024479.079 L-EG7B-7C 3300010.00Rectangular201.060.0304839.3824479.195 L-EG7G-7C 3300010.00Rectangular201.000.0304848.5954479.195 L-EG7C-H17 123.52910.00Rectangular200.090.0304479.1954479.079 L-H17-H15 13446.810.00Rectangular200.480.0304479.0794413.892 Page 3 of 3 Bozeman Storm Water Facilities Plan Appendix C-4: Links, Output Data XP SWMM - LINKS, OUTPUT DATA Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) L-EG7S-7L Existing2-yr, 24-hr43.382.7 10-yr, 24-hr100.743.8 25-yr, 24-hr111.923.96 50-yr, 24-hr150.14.41 100-yr, 24-hr172.694.64 Future2-yr, 24-hr43.382.7 10-yr, 24-hr100.723.8 25-yr, 24-hr111.883.96 50-yr, 24-hr150.074.41 100-yr, 24-hr172.684.64 Pre-Development2-yr, 24-hr10.891.32 10-yr, 24-hr42.082.53 25-yr, 24-hr49.192.71 50-yr, 24-hr74.893.23 100-yr, 24-hr91.073.49 L-EG7L-H16 Existing2-yr, 24-hr58.442.73 10-yr, 24-hr153.343.55 25-yr, 24-hr172.843.66 50-yr, 24-hr240.583.96 100-yr, 24-hr281.574.11 Future2-yr, 24-hr58.412.73 10-yr, 24-hr153.283.55 25-yr, 24-hr172.753.66 50-yr, 24-hr240.583.96 100-yr, 24-hr281.544.11 Pre-Development2-yr, 24-hr22.92.02 10-yr, 24-hr89.773.08 25-yr, 24-hr104.943.21 50-yr, 24-hr159.283.57 100-yr, 24-hr193.323.74 L-EG7K-7F Existing2-yr, 24-hr52.472.81 10-yr, 24-hr119.433.92 25-yr, 24-hr132.024.08 50-yr, 24-hr174.564.53 100-yr, 24-hr201.364.79 Future2-yr, 24-hr52.462.81 10-yr, 24-hr119.393.92 25-yr, 24-hr131.984.08 50-yr, 24-hr174.554.53 100-yr, 24-hr201.344.79 Pre-Development2-yr, 24-hr14.951.51 10-yr, 24-hr54.762.76 25-yr, 24-hr63.322.93 50-yr, 24-hr93.793.44 100-yr, 24-hr112.733.7 L-EG7F-H16 Existing2-yr, 24-hr70.762.87 10-yr, 24-hr180.13.83 25-yr, 24-hr202.233.95 50-yr, 24-hr279.144.32 100-yr, 24-hr325.764.5 Future2-yr, 24-hr70.732.87 10-yr, 24-hr180.033.83 25-yr, 24-hr202.143.95 50-yr, 24-hr279.124.32 100-yr, 24-hr325.734.5 Pre-Development2-yr, 24-hr28.972.12 10-yr, 24-hr108.483.3 25-yr, 24-hr126.173.45 50-yr, 24-hr189.673.9 100-yr, 24-hr229.484.11 L-H16-H15 Existing2-yr, 24-hr129.043.66 10-yr, 24-hr333.115.78 25-yr, 24-hr374.726.05 50-yr, 24-hr519.366.78 100-yr, 24-hr606.97.19 Future2-yr, 24-hr128.973.42 10-yr, 24-hr332.915.15 25-yr, 24-hr374.495.42 50-yr, 24-hr519.226.23 100-yr, 24-hr606.766.63 Pre-Development2-yr, 24-hr51.692.51 10-yr, 24-hr197.984.16 Page 1 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr230.794.51 50-yr, 24-hr348.535.52 100-yr, 24-hr422.546.04 L-EG5Q-5P Existing2-yr, 24-hr86.574.39 10-yr, 24-hr205.896.07 25-yr, 24-hr228.776.31 50-yr, 24-hr308.027.03 100-yr, 24-hr360.737.44 Future2-yr, 24-hr86.564.39 10-yr, 24-hr266.466.04 25-yr, 24-hr312.786.5 50-yr, 24-hr332.546.67 100-yr, 24-hr395.997.01 Pre-Development2-yr, 24-hr18.692.43 10-yr, 24-hr88.94.4 25-yr, 24-hr104.514.68 50-yr, 24-hr160.935.53 100-yr, 24-hr196.295.97 L-EG5P-6B Existing2-yr, 24-hr129.444.8 10-yr, 24-hr299.916.49 25-yr, 24-hr332.166.77 50-yr, 24-hr450.827.63 100-yr, 24-hr524.958.04 Future2-yr, 24-hr129.464.8 10-yr, 24-hr357.816.26 25-yr, 24-hr477.766.32 50-yr, 24-hr536.576.47 100-yr, 24-hr545.446.46 Pre-Development2-yr, 24-hr28.732.73 10-yr, 24-hr129.794.59 25-yr, 24-hr152.154.87 50-yr, 24-hr232.75.86 100-yr, 24-hr282.946.36 L-EG6B-H3 Existing2-yr, 24-hr150.914.11 10-yr, 24-hr342.296.27 25-yr, 24-hr379.766.34 50-yr, 24-hr520.747.17 100-yr, 24-hr604.497.59 Future2-yr, 24-hr150.964.11 10-yr, 24-hr636.446.42 25-yr, 24-hr447.076.38 50-yr, 24-hr825.756.53 100-yr, 24-hr613.236.44 Pre-Development2-yr, 24-hr35.392.41 10-yr, 24-hr196.925 25-yr, 24-hr219.625.25 50-yr, 24-hr271.525.64 100-yr, 24-hr328.635.86 L-EG5E-H4 Existing2-yr, 24-hr-22.430.57 10-yr, 24-hr-308.611.21 25-yr, 24-hr187.70.93 50-yr, 24-hr178.910.92 100-yr, 24-hr-1081.764.29 Future2-yr, 24-hr-22.430.57 10-yr, 24-hr1210.285.79 25-yr, 24-hr974.894.75 50-yr, 24-hr1378.616.51 100-yr, 24-hr1603.537.72 Pre-Development2-yr, 24-hr-7.290.36 10-yr, 24-hr570.672.84 25-yr, 24-hr475.752.37 50-yr, 24-hr-311.261.42 100-yr, 24-hr144.850.72 L-EG4B-H7 Existing2-yr, 24-hr38.821.63 10-yr, 24-hr144.724.38 25-yr, 24-hr158.484.57 50-yr, 24-hr154.94.54 100-yr, 24-hr167.464.7 Future2-yr, 24-hr38.821.63 10-yr, 24-hr-185.024.4 25-yr, 24-hr-243.974.43 50-yr, 24-hr-285.334.51 100-yr, 24-hr-367.574.43 Pre-Development2-yr, 24-hr8.290.74 10-yr, 24-hr103.443.67 Page 2 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr108.913.78 50-yr, 24-hr126.574.08 100-yr, 24-hr128.14.13 L-BC2F-H8 Existing2-yr, 24-hr48.943.63 10-yr, 24-hr125.364.43 25-yr, 24-hr140.624.49 50-yr, 24-hr192.324.58 100-yr, 24-hr222.834.62 Future2-yr, 24-hr48.933.63 10-yr, 24-hr129.134.81 25-yr, 24-hr140.524.89 50-yr, 24-hr192.114.95 100-yr, 24-hr305.255.47 Pre-Development2-yr, 24-hr14.192.2 10-yr, 24-hr69.783.84 25-yr, 24-hr80.783.97 50-yr, 24-hr117.964.26 100-yr, 24-hr139.684.36 L-BC1A-2B Existing2-yr, 24-hr52.782.78 10-yr, 24-hr167.974.85 25-yr, 24-hr191.195.13 50-yr, 24-hr269.15.93 100-yr, 24-hr314.616.31 Future2-yr, 24-hr52.782.78 10-yr, 24-hr167.874.86 25-yr, 24-hr190.995.15 50-yr, 24-hr268.915.94 100-yr, 24-hr314.546.27 Pre-Development2-yr, 24-hr26.481.95 10-yr, 24-hr121.244.25 25-yr, 24-hr138.314.51 50-yr, 24-hr207.235.41 100-yr, 24-hr250.375.85 L-BC2C-2A Existing2-yr, 24-hr13.172.03 10-yr, 24-hr37.973.13 25-yr, 24-hr42.533.27 50-yr, 24-hr57.193.66 100-yr, 24-hr65.493.85 Future2-yr, 24-hr13.172.03 10-yr, 24-hr37.953.13 25-yr, 24-hr42.483.27 50-yr, 24-hr57.153.66 100-yr, 24-hr65.473.85 Pre-Development2-yr, 24-hr5.691.49 10-yr, 24-hr24.82.76 25-yr, 24-hr29.012.94 50-yr, 24-hr43.213.42 100-yr, 24-hr51.483.65 L-BC2A-H14 Existing2-yr, 24-hr57.63.54 10-yr, 24-hr142.414.96 25-yr, 24-hr158.595.16 50-yr, 24-hr2135.74 100-yr, 24-hr244.616.08 Future2-yr, 24-hr57.63.54 10-yr, 24-hr142.314.96 25-yr, 24-hr158.435.16 50-yr, 24-hr212.785.82 100-yr, 24-hr244.646.03 Pre-Development2-yr, 24-hr21.272.43 10-yr, 24-hr78.263.98 25-yr, 24-hr89.14.17 50-yr, 24-hr125.624.73 100-yr, 24-hr147.145.01 L-BC2E-H14 Existing2-yr, 24-hr37.812.79 10-yr, 24-hr94.843.96 25-yr, 24-hr106.334.13 50-yr, 24-hr145.94.64 100-yr, 24-hr169.564.91 Future2-yr, 24-hr37.812.79 10-yr, 24-hr94.783.96 25-yr, 24-hr106.254.13 50-yr, 24-hr145.814.64 100-yr, 24-hr169.524.91 Pre-Development2-yr, 24-hr9.641.61 10-yr, 24-hr48.813.06 Page 3 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr56.923.25 50-yr, 24-hr85.023.79 100-yr, 24-hr101.874.06 L-H14-BC2B Existing2-yr, 24-hr94.513.97 10-yr, 24-hr235.595.94 25-yr, 24-hr263.116.22 50-yr, 24-hr356.647.03 100-yr, 24-hr411.487.43 Future2-yr, 24-hr94.513.97 10-yr, 24-hr235.385.97 25-yr, 24-hr262.786.24 50-yr, 24-hr355.667.03 100-yr, 24-hr411.397.39 Pre-Development2-yr, 24-hr30.472.18 10-yr, 24-hr126.424.48 25-yr, 24-hr145.384.78 50-yr, 24-hr209.985.62 100-yr, 24-hr248.476.03 L-BC2B-H8 Existing2-yr, 24-hr166.837.52 10-yr, 24-hr449.2410.41 25-yr, 24-hr504.7810.79 50-yr, 24-hr691.711.83 100-yr, 24-hr800.9112.33 Future2-yr, 24-hr166.837.52 10-yr, 24-hr461.5411.07 25-yr, 24-hr503.6911.27 50-yr, 24-hr689.8612.03 100-yr, 24-hr885.1812.88 Pre-Development2-yr, 24-hr65.875.43 10-yr, 24-hr275.668.96 25-yr, 24-hr315.249.35 50-yr, 24-hr446.4310.45 100-yr, 24-hr538.2511.06 H8_BC3B Existing2-yr, 24-hr214.477.71 10-yr, 24-hr572.3210.88 25-yr, 24-hr642.8611.31 50-yr, 24-hr880.8712.55 100-yr, 24-hr1020.3513.13 Future2-yr, 24-hr214.467.71 10-yr, 24-hr640.9210.46 25-yr, 24-hr662.1210.57 50-yr, 24-hr878.7811.05 100-yr, 24-hr1192.412.79 Pre-Development2-yr, 24-hr79.55.34 10-yr, 24-hr344.859.14 25-yr, 24-hr395.539.58 50-yr, 24-hr563.9310.83 100-yr, 24-hr672.9611.49 BC3B_2488 Existing2-yr, 24-hr219.616.7 10-yr, 24-hr583.568.99 25-yr, 24-hr655.059.28 50-yr, 24-hr896.0510.09 100-yr, 24-hr1035.4410.35 Future2-yr, 24-hr219.66.7 10-yr, 24-hr9560.3547.35 25-yr, 24-hr872.818.73 50-yr, 24-hr16150.4464.59 100-yr, 24-hr17780.568.54 Pre-Development2-yr, 24-hr81.754.87 10-yr, 24-hr351.587.76 25-yr, 24-hr403.128.08 50-yr, 24-hr574.058.95 100-yr, 24-hr685.529.4 3519_3518 Existing2-yr, 24-hr1.577.12 10-yr, 24-hr1.677.44 25-yr, 24-hr1.697.51 50-yr, 24-hr1.747.7 100-yr, 24-hr1.767.79 Future2-yr, 24-hr1.577.13 10-yr, 24-hr1.677.44 25-yr, 24-hr1.697.5 50-yr, 24-hr1.747.71 100-yr, 24-hr1.767.79 Pre-Development2-yr, 24-hr1.476.78 10-yr, 24-hr1.687.64 Page 4 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr1.727.8 50-yr, 24-hr1.717.57 100-yr, 24-hr1.737.67 3518_3056 Existing2-yr, 24-hr1.457.27 10-yr, 24-hr1.486.8 25-yr, 24-hr1.486.81 50-yr, 24-hr1.497.01 100-yr, 24-hr1.56.86 Future2-yr, 24-hr1.457.27 10-yr, 24-hr1.486.8 25-yr, 24-hr1.486.81 50-yr, 24-hr1.497.01 100-yr, 24-hr1.56.86 Pre-Development2-yr, 24-hr1.437.27 10-yr, 24-hr1.476.77 25-yr, 24-hr1.476.78 50-yr, 24-hr1.497.01 100-yr, 24-hr1.496.83 3056_3055 Existing2-yr, 24-hr1.464.12 10-yr, 24-hr1.484.18 25-yr, 24-hr1.484.19 50-yr, 24-hr1.494.22 100-yr, 24-hr1.54.23 Future2-yr, 24-hr1.464.12 10-yr, 24-hr1.484.18 25-yr, 24-hr1.484.19 50-yr, 24-hr1.494.22 100-yr, 24-hr1.54.23 Pre-Development2-yr, 24-hr1.434.06 10-yr, 24-hr1.474.16 25-yr, 24-hr1.484.17 50-yr, 24-hr1.494.2 100-yr, 24-hr1.494.21 3055_2955 Existing2-yr, 24-hr1.466.93 10-yr, 24-hr1.486.95 25-yr, 24-hr1.486.96 50-yr, 24-hr1.56.97 100-yr, 24-hr1.56.98 Future2-yr, 24-hr1.466.92 10-yr, 24-hr1.486.95 25-yr, 24-hr1.496.95 50-yr, 24-hr1.56.97 100-yr, 24-hr1.56.97 Pre-Development2-yr, 24-hr1.436.9 10-yr, 24-hr1.4713.05 25-yr, 24-hr1.486.95 50-yr, 24-hr1.496.96 100-yr, 24-hr1.496.97 2955_3071 Existing2-yr, 24-hr1.454.26 10-yr, 24-hr1.484.28 25-yr, 24-hr1.484.28 50-yr, 24-hr1.494.28 100-yr, 24-hr1.54.29 Future2-yr, 24-hr1.454.26 10-yr, 24-hr1.484.28 25-yr, 24-hr1.484.28 50-yr, 24-hr1.494.28 100-yr, 24-hr1.54.29 Pre-Development2-yr, 24-hr1.434.25 10-yr, 24-hr1.474.27 25-yr, 24-hr1.484.27 50-yr, 24-hr1.494.28 100-yr, 24-hr1.494.28 3071_3072 Existing2-yr, 24-hr1.466.05 10-yr, 24-hr1.486.08 25-yr, 24-hr1.496.08 50-yr, 24-hr1.496.1 100-yr, 24-hr1.56.1 Future2-yr, 24-hr1.466.05 10-yr, 24-hr1.486.08 25-yr, 24-hr1.486.08 50-yr, 24-hr1.56.1 100-yr, 24-hr1.56.1 Pre-Development2-yr, 24-hr1.436.03 10-yr, 24-hr1.476.07 Page 5 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr1.486.08 50-yr, 24-hr1.496.09 100-yr, 24-hr1.496.09 3072_3075 Existing2-yr, 24-hr1.535.93 10-yr, 24-hr1.555.96 25-yr, 24-hr1.525.97 50-yr, 24-hr1.545.98 100-yr, 24-hr1.565.98 Future2-yr, 24-hr1.535.93 10-yr, 24-hr1.555.96 25-yr, 24-hr1.535.96 50-yr, 24-hr1.565.98 100-yr, 24-hr1.565.98 Pre-Development2-yr, 24-hr1.435.91 10-yr, 24-hr1.515.95 25-yr, 24-hr1.55.96 50-yr, 24-hr1.545.97 100-yr, 24-hr1.545.97 3075_3074 Existing2-yr, 24-hr1.733.39 10-yr, 24-hr2.473.56 25-yr, 24-hr2.473.55 50-yr, 24-hr2.443.55 100-yr, 24-hr2.613.57 Future2-yr, 24-hr1.733.39 10-yr, 24-hr2.413.54 25-yr, 24-hr2.453.55 50-yr, 24-hr2.43.56 100-yr, 24-hr2.593.57 Pre-Development2-yr, 24-hr1.433.31 10-yr, 24-hr2.193.53 25-yr, 24-hr2.213.56 50-yr, 24-hr2.453.56 100-yr, 24-hr2.423.56 3062_3074 Existing2-yr, 24-hr-0.130.56 10-yr, 24-hr-0.531.47 25-yr, 24-hr-0.471.58 50-yr, 24-hr0.41.51 100-yr, 24-hr0.441.7 Future2-yr, 24-hr-0.130.56 10-yr, 24-hr-0.531.57 25-yr, 24-hr-0.471.6 50-yr, 24-hr0.421.55 100-yr, 24-hr0.471.75 Pre-Development2-yr, 24-hr00 10-yr, 24-hr-0.451.35 25-yr, 24-hr-0.481.41 50-yr, 24-hr-0.541.49 100-yr, 24-hr-0.531.53 2956_3070 Existing2-yr, 24-hr3.657.25 10-yr, 24-hr4.367.77 25-yr, 24-hr4.387.79 50-yr, 24-hr4.467.91 100-yr, 24-hr4.537.99 Future2-yr, 24-hr3.657.25 10-yr, 24-hr4.367.76 25-yr, 24-hr4.387.8 50-yr, 24-hr4.457.91 100-yr, 24-hr4.497.96 Pre-Development2-yr, 24-hr1.826.44 10-yr, 24-hr4.277.64 25-yr, 24-hr4.317.7 50-yr, 24-hr4.417.85 100-yr, 24-hr4.457.91 3070_3073 Existing2-yr, 24-hr3.657.81 10-yr, 24-hr4.378.05 25-yr, 24-hr4.388.02 50-yr, 24-hr4.467.98 100-yr, 24-hr4.528.04 Future2-yr, 24-hr3.657.81 10-yr, 24-hr4.368.05 25-yr, 24-hr4.388.03 50-yr, 24-hr4.467.97 100-yr, 24-hr4.498.04 Pre-Development2-yr, 24-hr1.826.54 10-yr, 24-hr4.278.03 Page 6 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr4.328.05 50-yr, 24-hr4.428.05 100-yr, 24-hr4.468.05 3059_3073 Existing2-yr, 24-hr0.030.15 10-yr, 24-hr0.280.79 25-yr, 24-hr0.280.78 50-yr, 24-hr0.310.87 100-yr, 24-hr0.30.84 Future2-yr, 24-hr-0.030.16 10-yr, 24-hr0.310.86 25-yr, 24-hr0.290.81 50-yr, 24-hr0.340.94 100-yr, 24-hr0.320.89 Pre-Development2-yr, 24-hr-0.010.12 10-yr, 24-hr0.240.66 25-yr, 24-hr0.260.74 50-yr, 24-hr0.330.93 100-yr, 24-hr0.30.83 3073_3074 Existing2-yr, 24-hr3.66.64 10-yr, 24-hr4.366.68 25-yr, 24-hr4.386.64 50-yr, 24-hr4.456.71 100-yr, 24-hr4.56.75 Future2-yr, 24-hr3.66.64 10-yr, 24-hr4.366.68 25-yr, 24-hr4.386.64 50-yr, 24-hr4.456.71 100-yr, 24-hr4.496.75 Pre-Development2-yr, 24-hr1.825.75 10-yr, 24-hr4.276.74 25-yr, 24-hr4.326.76 50-yr, 24-hr4.416.76 100-yr, 24-hr4.466.67 3074_3076 Existing2-yr, 24-hr4.833.89 10-yr, 24-hr5.865.73 25-yr, 24-hr5.875.74 50-yr, 24-hr5.954.7 100-yr, 24-hr6.014.74 Future2-yr, 24-hr4.833.89 10-yr, 24-hr5.865.73 25-yr, 24-hr5.875.74 50-yr, 24-hr5.954.7 100-yr, 24-hr5.994.72 Pre-Development2-yr, 24-hr3.253.65 10-yr, 24-hr5.725.74 25-yr, 24-hr5.785.74 50-yr, 24-hr5.914.67 100-yr, 24-hr5.965.7 3076_3077 Existing2-yr, 24-hr6.295.15 10-yr, 24-hr7.475.94 25-yr, 24-hr7.55.97 50-yr, 24-hr7.66.04 100-yr, 24-hr7.676.09 Future2-yr, 24-hr6.35.15 10-yr, 24-hr7.475.94 25-yr, 24-hr7.55.97 50-yr, 24-hr7.616.04 100-yr, 24-hr7.676.09 Pre-Development2-yr, 24-hr4.094.99 10-yr, 24-hr7.345.85 25-yr, 24-hr7.415.9 50-yr, 24-hr7.545.99 100-yr, 24-hr7.66.04 3078_3520 Existing2-yr, 24-hr-0.10.43 10-yr, 24-hr0.340.81 25-yr, 24-hr0.340.81 50-yr, 24-hr0.360.73 100-yr, 24-hr0.40.91 Future2-yr, 24-hr-0.110.43 10-yr, 24-hr0.310.8 25-yr, 24-hr0.380.81 50-yr, 24-hr0.370.73 100-yr, 24-hr0.440.91 Pre-Development2-yr, 24-hr00 10-yr, 24-hr0.310.65 Page 7 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr0.30.71 50-yr, 24-hr0.370.8 100-yr, 24-hr0.380.77 3520_3077 Existing2-yr, 24-hr-0.210.28 10-yr, 24-hr0.611.12 25-yr, 24-hr0.661.2 50-yr, 24-hr0.631.15 100-yr, 24-hr0.71.29 Future2-yr, 24-hr-0.210.28 10-yr, 24-hr0.661.21 25-yr, 24-hr0.61.09 50-yr, 24-hr0.671.23 100-yr, 24-hr0.731.33 Pre-Development2-yr, 24-hr-0.040.14 10-yr, 24-hr0.561.01 25-yr, 24-hr0.571.04 50-yr, 24-hr0.651.18 100-yr, 24-hr0.631.14 3077_3067 Existing2-yr, 24-hr6.285.08 10-yr, 24-hr7.486 25-yr, 24-hr7.516.03 50-yr, 24-hr7.646.1 100-yr, 24-hr7.676.15 Future2-yr, 24-hr6.295.09 10-yr, 24-hr7.476 25-yr, 24-hr7.516.02 50-yr, 24-hr7.666.12 100-yr, 24-hr7.696.15 Pre-Development2-yr, 24-hr4.084.17 10-yr, 24-hr7.349.09 25-yr, 24-hr7.415.95 50-yr, 24-hr7.556.05 100-yr, 24-hr7.616.1 3067_3066 Existing2-yr, 24-hr6.285.16 10-yr, 24-hr7.486.05 25-yr, 24-hr7.526.07 50-yr, 24-hr7.646.15 100-yr, 24-hr7.676.19 Future2-yr, 24-hr6.285.17 10-yr, 24-hr7.476.05 25-yr, 24-hr7.516.07 50-yr, 24-hr7.666.17 100-yr, 24-hr7.696.2 Pre-Development2-yr, 24-hr4.084.31 10-yr, 24-hr7.345.94 25-yr, 24-hr7.426 50-yr, 24-hr7.556.1 100-yr, 24-hr7.616.15 3066_3068 Existing2-yr, 24-hr6.284.54 10-yr, 24-hr7.734.63 25-yr, 24-hr7.764.63 50-yr, 24-hr7.824.63 100-yr, 24-hr7.874.63 Future2-yr, 24-hr6.284.54 10-yr, 24-hr7.764.63 25-yr, 24-hr7.794.63 50-yr, 24-hr7.854.63 100-yr, 24-hr7.874.63 Pre-Development2-yr, 24-hr4.084.11 10-yr, 24-hr7.524.62 25-yr, 24-hr7.654.63 50-yr, 24-hr7.764.63 100-yr, 24-hr7.824.63 3068_2965 Existing2-yr, 24-hr8.995.97 10-yr, 24-hr11.876.64 25-yr, 24-hr12.126.78 50-yr, 24-hr12.837.15 100-yr, 24-hr12.977.22 Future2-yr, 24-hr95.96 10-yr, 24-hr11.876.64 25-yr, 24-hr12.116.77 50-yr, 24-hr12.717.08 100-yr, 24-hr12.817.14 Pre-Development2-yr, 24-hr5.455.43 10-yr, 24-hr10.836.09 Page 8 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr11.216.3 50-yr, 24-hr12.266.85 100-yr, 24-hr12.767.1 2965_2964 Existing2-yr, 24-hr8.995.85 10-yr, 24-hr11.886.74 25-yr, 24-hr12.136.88 50-yr, 24-hr12.837.26 100-yr, 24-hr12.987.34 Future2-yr, 24-hr8.995.85 10-yr, 24-hr11.876.74 25-yr, 24-hr12.116.87 50-yr, 24-hr12.77.19 100-yr, 24-hr12.817.25 Pre-Development2-yr, 24-hr5.455.35 10-yr, 24-hr10.826.18 25-yr, 24-hr11.216.39 50-yr, 24-hr12.266.95 100-yr, 24-hr12.767.22 2964_2845 Existing2-yr, 24-hr98.58 10-yr, 24-hr11.889.09 25-yr, 24-hr12.149.14 50-yr, 24-hr12.849.16 100-yr, 24-hr12.989.16 Future2-yr, 24-hr8.998.58 10-yr, 24-hr11.879.11 25-yr, 24-hr12.119.14 50-yr, 24-hr12.639.16 100-yr, 24-hr12.89.16 Pre-Development2-yr, 24-hr5.457.57 10-yr, 24-hr10.828.92 25-yr, 24-hr11.218.99 50-yr, 24-hr12.269.13 100-yr, 24-hr12.7212.51 2845_3527 Existing2-yr, 24-hr8.997.73 10-yr, 24-hr11.868.09 25-yr, 24-hr12.138.1 50-yr, 24-hr12.888.09 100-yr, 24-hr12.998.09 Future2-yr, 24-hr8.997.73 10-yr, 24-hr11.878.09 25-yr, 24-hr12.18.09 50-yr, 24-hr12.628.09 100-yr, 24-hr12.658.09 Pre-Development2-yr, 24-hr5.456.86 10-yr, 24-hr10.828 25-yr, 24-hr11.28.04 50-yr, 24-hr12.228.09 100-yr, 24-hr12.678.09 3527_2867 Existing2-yr, 24-hr8.997.72 10-yr, 24-hr11.868.08 25-yr, 24-hr12.128.08 50-yr, 24-hr12.868.07 100-yr, 24-hr138.1 Future2-yr, 24-hr8.997.72 10-yr, 24-hr11.868.07 25-yr, 24-hr12.18.08 50-yr, 24-hr12.618.06 100-yr, 24-hr12.638.06 Pre-Development2-yr, 24-hr5.456.85 10-yr, 24-hr10.827.98 25-yr, 24-hr11.28.02 50-yr, 24-hr12.198.08 100-yr, 24-hr12.678.08 2867_3151 Existing2-yr, 24-hr8.996.28 10-yr, 24-hr11.876.39 25-yr, 24-hr12.226.37 50-yr, 24-hr12.876.4 100-yr, 24-hr13.016.37 Future2-yr, 24-hr96.28 10-yr, 24-hr11.866.27 25-yr, 24-hr12.16.27 50-yr, 24-hr12.66.26 100-yr, 24-hr12.626.26 Pre-Development2-yr, 24-hr5.455.58 10-yr, 24-hr10.896.42 Page 9 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr11.26.43 50-yr, 24-hr12.266.39 100-yr, 24-hr12.676.39 3054_3038 Existing2-yr, 24-hr1.564.39 10-yr, 24-hr2.215.97 25-yr, 24-hr2.225.99 50-yr, 24-hr2.236.01 100-yr, 24-hr2.236.01 Future2-yr, 24-hr1.564.39 10-yr, 24-hr2.215.96 25-yr, 24-hr2.215.98 50-yr, 24-hr2.236 100-yr, 24-hr2.236.01 Pre-Development2-yr, 24-hr0.952.67 10-yr, 24-hr2.185.91 25-yr, 24-hr2.25.94 50-yr, 24-hr2.226.01 100-yr, 24-hr2.236.01 3038_3529 Existing2-yr, 24-hr1.568.33 10-yr, 24-hr2.216.24 25-yr, 24-hr2.226.24 50-yr, 24-hr2.239.78 100-yr, 24-hr2.237.74 Future2-yr, 24-hr1.568.33 10-yr, 24-hr2.26.24 25-yr, 24-hr2.216.24 50-yr, 24-hr2.239.78 100-yr, 24-hr2.237.74 Pre-Development2-yr, 24-hr0.958.31 10-yr, 24-hr2.186.23 25-yr, 24-hr2.26.24 50-yr, 24-hr2.229.72 100-yr, 24-hr2.237.38 3529_2957 Existing2-yr, 24-hr1.567.31 10-yr, 24-hr2.217.79 25-yr, 24-hr2.217.79 50-yr, 24-hr2.247.79 100-yr, 24-hr2.247.78 Future2-yr, 24-hr1.567.31 10-yr, 24-hr2.27.79 25-yr, 24-hr2.217.79 50-yr, 24-hr2.247.79 100-yr, 24-hr2.237.78 Pre-Development2-yr, 24-hr0.956.47 10-yr, 24-hr2.187.79 25-yr, 24-hr2.27.8 50-yr, 24-hr2.237.8 100-yr, 24-hr2.247.79 2957_3058 Existing2-yr, 24-hr1.556.69 10-yr, 24-hr2.26.99 25-yr, 24-hr2.216.99 50-yr, 24-hr2.226.93 100-yr, 24-hr2.226.96 Future2-yr, 24-hr1.556.69 10-yr, 24-hr2.26.99 25-yr, 24-hr2.216.99 50-yr, 24-hr2.226.93 100-yr, 24-hr2.226.96 Pre-Development2-yr, 24-hr0.955.95 10-yr, 24-hr2.186.97 25-yr, 24-hr2.26.98 50-yr, 24-hr2.226.99 100-yr, 24-hr2.227 3058_3060 Existing2-yr, 24-hr1.555.68 10-yr, 24-hr2.25.64 25-yr, 24-hr2.215.69 50-yr, 24-hr2.225.77 100-yr, 24-hr2.225.85 Future2-yr, 24-hr1.555.67 10-yr, 24-hr2.25.63 25-yr, 24-hr2.215.69 50-yr, 24-hr2.225.78 100-yr, 24-hr2.225.85 Pre-Development2-yr, 24-hr0.955.26 10-yr, 24-hr2.186.55 Page 10 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr2.25.98 50-yr, 24-hr2.225.82 100-yr, 24-hr2.225.87 3060_3061 Existing2-yr, 24-hr1.554.6 10-yr, 24-hr2.064.57 25-yr, 24-hr2.064.58 50-yr, 24-hr2.044.65 100-yr, 24-hr2.064.68 Future2-yr, 24-hr1.554.6 10-yr, 24-hr2.074.57 25-yr, 24-hr2.064.59 50-yr, 24-hr2.044.65 100-yr, 24-hr2.064.68 Pre-Development2-yr, 24-hr0.944.45 10-yr, 24-hr2.074.83 25-yr, 24-hr2.084.83 50-yr, 24-hr2.074.77 100-yr, 24-hr2.074.79 3061_3064 Existing2-yr, 24-hr3.15.53 10-yr, 24-hr3.295.82 25-yr, 24-hr3.315.84 50-yr, 24-hr3.365.92 100-yr, 24-hr3.385.96 Future2-yr, 24-hr3.15.52 10-yr, 24-hr3.295.82 25-yr, 24-hr3.315.85 50-yr, 24-hr3.365.92 100-yr, 24-hr3.385.96 Pre-Development2-yr, 24-hr1.825.23 10-yr, 24-hr3.235.73 25-yr, 24-hr3.265.77 50-yr, 24-hr3.325.87 100-yr, 24-hr3.355.91 3063_3064 Existing2-yr, 24-hr0.571.03 10-yr, 24-hr1.352.45 25-yr, 24-hr1.362.46 50-yr, 24-hr1.693.05 100-yr, 24-hr2.083.78 Future2-yr, 24-hr0.540.98 10-yr, 24-hr1.352.44 25-yr, 24-hr1.362.46 50-yr, 24-hr1.683.04 100-yr, 24-hr2.083.78 Pre-Development2-yr, 24-hr00 10-yr, 24-hr1.342.43 25-yr, 24-hr1.372.48 50-yr, 24-hr1.612.93 100-yr, 24-hr1.733.12 3064_3065 Existing2-yr, 24-hr2.875.18 10-yr, 24-hr2.975.32 25-yr, 24-hr2.985.34 50-yr, 24-hr3.045.42 100-yr, 24-hr3.065.45 Future2-yr, 24-hr2.875.18 10-yr, 24-hr2.965.32 25-yr, 24-hr2.975.34 50-yr, 24-hr3.035.41 100-yr, 24-hr3.065.45 Pre-Development2-yr, 24-hr1.773.43 10-yr, 24-hr2.945.29 25-yr, 24-hr2.965.31 50-yr, 24-hr3.015.39 100-yr, 24-hr3.035.41 3065_3069 Existing2-yr, 24-hr2.874.05 10-yr, 24-hr2.964.05 25-yr, 24-hr2.984.05 50-yr, 24-hr3.044.04 100-yr, 24-hr3.064.04 Future2-yr, 24-hr2.874.05 10-yr, 24-hr2.964.06 25-yr, 24-hr2.974.06 50-yr, 24-hr3.034.05 100-yr, 24-hr3.064.04 Pre-Development2-yr, 24-hr1.773.78 10-yr, 24-hr2.944.05 Page 11 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr2.964.05 50-yr, 24-hr3.014.04 100-yr, 24-hr3.034.05 3069_3109 Existing2-yr, 24-hr2.875.45 10-yr, 24-hr2.975.49 25-yr, 24-hr2.985.5 50-yr, 24-hr3.045.52 100-yr, 24-hr3.065.52 Future2-yr, 24-hr2.875.45 10-yr, 24-hr2.965.49 25-yr, 24-hr2.985.49 50-yr, 24-hr3.035.52 100-yr, 24-hr3.065.52 Pre-Development2-yr, 24-hr1.774.87 10-yr, 24-hr2.955.48 25-yr, 24-hr2.965.49 50-yr, 24-hr3.015.51 100-yr, 24-hr3.035.51 2958_3104 Existing2-yr, 24-hr2.146.13 10-yr, 24-hr2.486.71 25-yr, 24-hr2.496.72 50-yr, 24-hr2.4912.65 100-yr, 24-hr2.4911.16 Future2-yr, 24-hr2.136.15 10-yr, 24-hr2.486.71 25-yr, 24-hr2.496.72 50-yr, 24-hr2.4912.65 100-yr, 24-hr2.4911.16 Pre-Development2-yr, 24-hr1.275.44 10-yr, 24-hr2.466.71 25-yr, 24-hr2.476.72 50-yr, 24-hr2.4912.58 100-yr, 24-hr2.511.17 3104_3105 Existing2-yr, 24-hr2.138.72 10-yr, 24-hr2.466.34 25-yr, 24-hr2.476.33 50-yr, 24-hr2.468.08 100-yr, 24-hr2.4610.36 Future2-yr, 24-hr2.138.72 10-yr, 24-hr2.466.34 25-yr, 24-hr2.476.33 50-yr, 24-hr2.468.08 100-yr, 24-hr2.4610.36 Pre-Development2-yr, 24-hr1.378.71 10-yr, 24-hr2.466.46 25-yr, 24-hr2.466.55 50-yr, 24-hr2.478.06 100-yr, 24-hr2.4710.37 3105_3106 Existing2-yr, 24-hr2.655.78 10-yr, 24-hr2.655.77 25-yr, 24-hr2.655.77 50-yr, 24-hr2.655.79 100-yr, 24-hr2.655.81 Future2-yr, 24-hr2.655.77 10-yr, 24-hr2.655.77 25-yr, 24-hr2.655.76 50-yr, 24-hr2.655.79 100-yr, 24-hr2.655.81 Pre-Development2-yr, 24-hr2.124.79 10-yr, 24-hr2.655.81 25-yr, 24-hr2.665.82 50-yr, 24-hr2.655.78 100-yr, 24-hr2.645.76 3106_3107 Existing2-yr, 24-hr2.65.25 10-yr, 24-hr2.595.25 25-yr, 24-hr2.65.25 50-yr, 24-hr2.625.26 100-yr, 24-hr2.645.27 Future2-yr, 24-hr2.595.26 10-yr, 24-hr2.595.25 25-yr, 24-hr2.65.25 50-yr, 24-hr2.625.26 100-yr, 24-hr2.645.27 Pre-Development2-yr, 24-hr2.115.16 10-yr, 24-hr2.65.27 Page 12 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr2.65.27 50-yr, 24-hr2.615.26 100-yr, 24-hr2.625.26 3107_3108 Existing2-yr, 24-hr2.544.75 10-yr, 24-hr2.594.75 25-yr, 24-hr2.64.75 50-yr, 24-hr2.624.78 100-yr, 24-hr2.644.81 Future2-yr, 24-hr2.544.75 10-yr, 24-hr2.594.75 25-yr, 24-hr2.64.75 50-yr, 24-hr2.624.78 100-yr, 24-hr2.644.8 Pre-Development2-yr, 24-hr2.14.73 10-yr, 24-hr2.594.74 25-yr, 24-hr2.594.74 50-yr, 24-hr2.614.77 100-yr, 24-hr2.624.78 3108_3109 Existing2-yr, 24-hr2.545.05 10-yr, 24-hr2.595.08 25-yr, 24-hr2.65.08 50-yr, 24-hr2.625.06 100-yr, 24-hr2.645.12 Future2-yr, 24-hr2.545.07 10-yr, 24-hr2.595.04 25-yr, 24-hr2.65.08 50-yr, 24-hr2.625.06 100-yr, 24-hr2.645.06 Pre-Development2-yr, 24-hr2.094.98 10-yr, 24-hr2.585.04 25-yr, 24-hr2.586.69 50-yr, 24-hr2.615.05 100-yr, 24-hr2.625.05 3109_2963 Existing2-yr, 24-hr5.417.7 10-yr, 24-hr5.557.79 25-yr, 24-hr5.577.8 50-yr, 24-hr5.658.93 100-yr, 24-hr5.697.86 Future2-yr, 24-hr5.47.7 10-yr, 24-hr5.557.74 25-yr, 24-hr5.567.69 50-yr, 24-hr5.88.93 100-yr, 24-hr5.697.67 Pre-Development2-yr, 24-hr3.837.05 10-yr, 24-hr5.517.79 25-yr, 24-hr5.547.8 50-yr, 24-hr5.618.93 100-yr, 24-hr5.657.85 2963_2803 Existing2-yr, 24-hr6.645.49 10-yr, 24-hr7.645.63 25-yr, 24-hr7.815.64 50-yr, 24-hr8.315.68 100-yr, 24-hr8.625.69 Future2-yr, 24-hr6.645.49 10-yr, 24-hr7.645.63 25-yr, 24-hr7.795.64 50-yr, 24-hr8.335.69 100-yr, 24-hr8.655.69 Pre-Development2-yr, 24-hr4.545.04 10-yr, 24-hr7.385.6 25-yr, 24-hr7.565.62 50-yr, 24-hr8.135.67 100-yr, 24-hr8.415.69 2803_3528 Existing2-yr, 24-hr6.647.38 10-yr, 24-hr7.657.53 25-yr, 24-hr7.837.53 50-yr, 24-hr8.297.45 100-yr, 24-hr8.627.48 Future2-yr, 24-hr6.647.38 10-yr, 24-hr7.637.53 25-yr, 24-hr7.797.53 50-yr, 24-hr8.327.45 100-yr, 24-hr8.647.48 Pre-Development2-yr, 24-hr4.546.69 10-yr, 24-hr7.387.51 Page 13 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr7.557.53 50-yr, 24-hr8.137.57 100-yr, 24-hr8.347.58 3528_3151 Existing2-yr, 24-hr6.647.27 10-yr, 24-hr7.667.3 25-yr, 24-hr7.847.27 50-yr, 24-hr8.297.3 100-yr, 24-hr8.627.31 Future2-yr, 24-hr6.647.27 10-yr, 24-hr7.627.3 25-yr, 24-hr7.797.27 50-yr, 24-hr8.327.3 100-yr, 24-hr8.647.31 Pre-Development2-yr, 24-hr4.546.69 10-yr, 24-hr7.377.37 25-yr, 24-hr7.527.37 50-yr, 24-hr8.127.37 100-yr, 24-hr8.337.34 3151_3150 Existing2-yr, 24-hr15.514.54 10-yr, 24-hr19.54.88 25-yr, 24-hr19.944.99 50-yr, 24-hr21.125.28 100-yr, 24-hr21.65.39 Future2-yr, 24-hr15.514.54 10-yr, 24-hr19.484.88 25-yr, 24-hr19.84.95 50-yr, 24-hr20.565.14 100-yr, 24-hr20.755.19 Pre-Development2-yr, 24-hr9.694.22 10-yr, 24-hr18.114.63 25-yr, 24-hr18.714.69 50-yr, 24-hr20.275.07 100-yr, 24-hr20.935.23 2780_2779 Existing2-yr, 24-hr1.044.98 10-yr, 24-hr1.095.15 25-yr, 24-hr1.095.17 50-yr, 24-hr1.115.19 100-yr, 24-hr1.115.2 Future2-yr, 24-hr1.044.98 10-yr, 24-hr1.095.15 25-yr, 24-hr1.095.17 50-yr, 24-hr1.115.19 100-yr, 24-hr1.115.2 Pre-Development2-yr, 24-hr1.024.91 10-yr, 24-hr1.085.11 25-yr, 24-hr1.095.14 50-yr, 24-hr1.15.19 100-yr, 24-hr1.115.19 2779_2778 Existing2-yr, 24-hr1.043.97 10-yr, 24-hr1.093.81 25-yr, 24-hr1.13.82 50-yr, 24-hr1.113.82 100-yr, 24-hr1.113.82 Future2-yr, 24-hr1.043.97 10-yr, 24-hr1.093.81 25-yr, 24-hr1.13.81 50-yr, 24-hr1.113.82 100-yr, 24-hr1.113.82 Pre-Development2-yr, 24-hr1.023.97 10-yr, 24-hr1.083.81 25-yr, 24-hr1.093.81 50-yr, 24-hr1.13.82 100-yr, 24-hr1.113.82 2778_2777 Existing2-yr, 24-hr1.046.8 10-yr, 24-hr1.096.88 25-yr, 24-hr1.16.89 50-yr, 24-hr1.116.9 100-yr, 24-hr1.118.71 Future2-yr, 24-hr1.046.8 10-yr, 24-hr1.096.89 25-yr, 24-hr1.16.9 50-yr, 24-hr1.116.91 100-yr, 24-hr1.118.71 Pre-Development2-yr, 24-hr1.026.77 10-yr, 24-hr1.087.28 Page 14 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr1.096.87 50-yr, 24-hr1.16.9 100-yr, 24-hr1.118.59 2777_2776 Existing2-yr, 24-hr1.045.52 10-yr, 24-hr1.115.59 25-yr, 24-hr1.145.6 50-yr, 24-hr1.195.62 100-yr, 24-hr1.275.63 Future2-yr, 24-hr1.045.52 10-yr, 24-hr1.15.59 25-yr, 24-hr1.145.6 50-yr, 24-hr1.195.63 100-yr, 24-hr1.275.64 Pre-Development2-yr, 24-hr1.025.65 10-yr, 24-hr1.15.56 25-yr, 24-hr1.125.58 50-yr, 24-hr1.195.62 100-yr, 24-hr1.235.62 2776_2775 Existing2-yr, 24-hr2.045.58 10-yr, 24-hr2.875.61 25-yr, 24-hr2.985.58 50-yr, 24-hr3.025.63 100-yr, 24-hr3.035.67 Future2-yr, 24-hr2.045.58 10-yr, 24-hr2.875.61 25-yr, 24-hr2.985.58 50-yr, 24-hr3.025.63 100-yr, 24-hr3.025.67 Pre-Development2-yr, 24-hr1.75.52 10-yr, 24-hr2.715.67 25-yr, 24-hr2.855.67 50-yr, 24-hr35.59 100-yr, 24-hr3.025.62 2775_2774 Existing2-yr, 24-hr2.013.77 10-yr, 24-hr2.774.95 25-yr, 24-hr2.815.01 50-yr, 24-hr2.855.08 100-yr, 24-hr2.845.05 Future2-yr, 24-hr2.013.77 10-yr, 24-hr2.694.81 25-yr, 24-hr2.714.85 50-yr, 24-hr2.694.8 100-yr, 24-hr2.64.63 Pre-Development2-yr, 24-hr1.693.6 10-yr, 24-hr2.594.62 25-yr, 24-hr2.634.69 50-yr, 24-hr2.845.06 100-yr, 24-hr2.855.07 2774_2769 Existing2-yr, 24-hr2.014.89 10-yr, 24-hr2.785.06 25-yr, 24-hr2.825.18 50-yr, 24-hr2.855.24 100-yr, 24-hr2.845.22 Future2-yr, 24-hr2.014.89 10-yr, 24-hr2.75.01 25-yr, 24-hr2.724.96 50-yr, 24-hr2.694.95 100-yr, 24-hr2.64.94 Pre-Development2-yr, 24-hr1.694.74 10-yr, 24-hr2.594.97 25-yr, 24-hr2.634.96 50-yr, 24-hr2.845.22 100-yr, 24-hr2.855.24 2769_2768 Existing2-yr, 24-hr3.696.03 10-yr, 24-hr5.066.27 25-yr, 24-hr5.076.28 50-yr, 24-hr5.16.6 100-yr, 24-hr5.146.59 Future2-yr, 24-hr3.696.03 10-yr, 24-hr5.066.27 25-yr, 24-hr5.076.28 50-yr, 24-hr5.086.6 100-yr, 24-hr5.086.59 Pre-Development2-yr, 24-hr2.515.59 10-yr, 24-hr4.826.09 Page 15 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr4.986.18 50-yr, 24-hr5.078.62 100-yr, 24-hr5.098.61 2768_3152 Existing2-yr, 24-hr3.675.31 10-yr, 24-hr5.056.33 25-yr, 24-hr5.076.34 50-yr, 24-hr5.16.38 100-yr, 24-hr5.146.42 Future2-yr, 24-hr3.685.31 10-yr, 24-hr5.056.33 25-yr, 24-hr5.076.35 50-yr, 24-hr5.076.35 100-yr, 24-hr5.076.34 Pre-Development2-yr, 24-hr2.515.01 10-yr, 24-hr4.826.06 25-yr, 24-hr4.986.24 50-yr, 24-hr5.076.35 100-yr, 24-hr5.096.37 3152_2804 Existing2-yr, 24-hr3.675.12 10-yr, 24-hr5.056.4 25-yr, 24-hr5.076.42 50-yr, 24-hr5.126.46 100-yr, 24-hr5.156.51 Future2-yr, 24-hr3.675.12 10-yr, 24-hr5.056.4 25-yr, 24-hr5.076.43 50-yr, 24-hr5.076.43 100-yr, 24-hr5.076.42 Pre-Development2-yr, 24-hr2.514.85 10-yr, 24-hr4.826.13 25-yr, 24-hr4.986.32 50-yr, 24-hr5.096.43 100-yr, 24-hr5.126.46 2804_3150 Existing2-yr, 24-hr3.677.24 10-yr, 24-hr5.069 25-yr, 24-hr5.168.95 50-yr, 24-hr5.227.37 100-yr, 24-hr5.267.44 Future2-yr, 24-hr3.677.24 10-yr, 24-hr5.039 25-yr, 24-hr5.048.95 50-yr, 24-hr5.047.37 100-yr, 24-hr5.047.44 Pre-Development2-yr, 24-hr2.516.45 10-yr, 24-hr4.827.46 25-yr, 24-hr4.978.99 50-yr, 24-hr5.167.53 100-yr, 24-hr5.217.53 2891_3150 Existing2-yr, 24-hr-0.030.12 10-yr, 24-hr-0.050.18 25-yr, 24-hr0.070.2 50-yr, 24-hr-0.070.28 100-yr, 24-hr0.050.2 Future2-yr, 24-hr-0.030.12 10-yr, 24-hr-0.992.56 25-yr, 24-hr-1.062.6 50-yr, 24-hr1.293.49 100-yr, 24-hr1.333.59 Pre-Development2-yr, 24-hr-0.050.09 10-yr, 24-hr-0.050.15 25-yr, 24-hr-0.050.14 50-yr, 24-hr-0.060.19 100-yr, 24-hr0.070.25 3150_3149 Existing2-yr, 24-hr19.115.4 10-yr, 24-hr24.546.13 25-yr, 24-hr25.086.26 50-yr, 24-hr26.156.55 100-yr, 24-hr26.576.65 Future2-yr, 24-hr19.115.4 10-yr, 24-hr24.56.12 25-yr, 24-hr24.786.2 50-yr, 24-hr25.516.39 100-yr, 24-hr25.686.43 Pre-Development2-yr, 24-hr12.055.08 10-yr, 24-hr22.885.72 Page 16 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr23.675.91 50-yr, 24-hr25.256.32 100-yr, 24-hr25.896.48 3149_3148 Existing2-yr, 24-hr19.095.14 10-yr, 24-hr24.616.08 25-yr, 24-hr25.076.29 50-yr, 24-hr26.266.59 100-yr, 24-hr26.576.67 Future2-yr, 24-hr19.095.13 10-yr, 24-hr24.56.03 25-yr, 24-hr24.786.17 50-yr, 24-hr25.56.4 100-yr, 24-hr25.686.45 Pre-Development2-yr, 24-hr12.044.81 10-yr, 24-hr22.895.51 25-yr, 24-hr23.685.7 50-yr, 24-hr25.286.35 100-yr, 24-hr25.986.52 3111_3112 Existing2-yr, 24-hr2.487.46 10-yr, 24-hr3.447.48 25-yr, 24-hr3.477.53 50-yr, 24-hr3.527.7 100-yr, 24-hr3.5416.16 Future2-yr, 24-hr2.487.45 10-yr, 24-hr3.457.5 25-yr, 24-hr3.477.53 50-yr, 24-hr3.527.7 100-yr, 24-hr3.5416.16 Pre-Development2-yr, 24-hr1.517.32 10-yr, 24-hr3.427.93 25-yr, 24-hr3.437.99 50-yr, 24-hr3.497.77 100-yr, 24-hr3.5316.14 3112_3113 Existing2-yr, 24-hr2.485.8 10-yr, 24-hr2.645.76 25-yr, 24-hr2.655.82 50-yr, 24-hr2.675.95 100-yr, 24-hr2.686.01 Future2-yr, 24-hr2.475.8 10-yr, 24-hr2.645.77 25-yr, 24-hr2.655.81 50-yr, 24-hr2.665.95 100-yr, 24-hr2.686.01 Pre-Development2-yr, 24-hr1.515.84 10-yr, 24-hr2.616.13 25-yr, 24-hr2.636.15 50-yr, 24-hr2.666.07 100-yr, 24-hr2.676.08 3113_3114 Existing2-yr, 24-hr2.164.7 10-yr, 24-hr2.164.7 25-yr, 24-hr2.154.69 50-yr, 24-hr2.174.72 100-yr, 24-hr2.174.75 Future2-yr, 24-hr2.164.71 10-yr, 24-hr2.164.7 25-yr, 24-hr2.154.69 50-yr, 24-hr2.174.73 100-yr, 24-hr2.174.75 Pre-Development2-yr, 24-hr1.54.71 10-yr, 24-hr2.164.83 25-yr, 24-hr2.174.85 50-yr, 24-hr2.164.78 100-yr, 24-hr2.184.8 3114_3115 Existing2-yr, 24-hr1.773.89 10-yr, 24-hr1.974.32 25-yr, 24-hr1.974.33 50-yr, 24-hr2.264.95 100-yr, 24-hr2.35.01 Future2-yr, 24-hr1.733.8 10-yr, 24-hr1.974.32 25-yr, 24-hr1.974.33 50-yr, 24-hr2.274.95 100-yr, 24-hr2.35.02 Pre-Development2-yr, 24-hr1.493.77 10-yr, 24-hr1.914.17 Page 17 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr1.994.36 50-yr, 24-hr2.184.78 100-yr, 24-hr2.35.02 3115_3110 Existing2-yr, 24-hr2.855.09 10-yr, 24-hr2.965.26 25-yr, 24-hr2.985.28 50-yr, 24-hr3.027.08 100-yr, 24-hr3.045.37 Future2-yr, 24-hr2.865.1 10-yr, 24-hr2.965.26 25-yr, 24-hr2.985.28 50-yr, 24-hr3.027.08 100-yr, 24-hr3.045.37 Pre-Development2-yr, 24-hr2.334.73 10-yr, 24-hr2.915.18 25-yr, 24-hr2.935.21 50-yr, 24-hr2.987.06 100-yr, 24-hr3.015.33 3110_2962 Existing2-yr, 24-hr2.855.23 10-yr, 24-hr2.965.34 25-yr, 24-hr2.985.36 50-yr, 24-hr3.025.43 100-yr, 24-hr3.045.62 Future2-yr, 24-hr2.855.23 10-yr, 24-hr2.965.34 25-yr, 24-hr2.985.36 50-yr, 24-hr3.025.42 100-yr, 24-hr3.045.62 Pre-Development2-yr, 24-hr2.275.23 10-yr, 24-hr2.915.26 25-yr, 24-hr2.935.29 50-yr, 24-hr2.985.37 100-yr, 24-hr3.015.6 2962_3521 Existing2-yr, 24-hr2.854.25 10-yr, 24-hr2.964.26 25-yr, 24-hr2.984.26 50-yr, 24-hr3.024.26 100-yr, 24-hr3.044.26 Future2-yr, 24-hr2.854.25 10-yr, 24-hr2.964.26 25-yr, 24-hr2.984.25 50-yr, 24-hr3.024.26 100-yr, 24-hr3.044.26 Pre-Development2-yr, 24-hr2.274.14 10-yr, 24-hr2.914.25 25-yr, 24-hr2.934.25 50-yr, 24-hr2.984.26 100-yr, 24-hr3.014.26 3521_3148 Existing2-yr, 24-hr2.856.04 10-yr, 24-hr2.966.09 25-yr, 24-hr2.986.1 50-yr, 24-hr3.026.11 100-yr, 24-hr3.046.12 Future2-yr, 24-hr2.856.04 10-yr, 24-hr2.986.07 25-yr, 24-hr2.986.07 50-yr, 24-hr3.026.07 100-yr, 24-hr3.046.07 Pre-Development2-yr, 24-hr2.275.72 10-yr, 24-hr2.916.06 25-yr, 24-hr2.936.07 50-yr, 24-hr2.986.1 100-yr, 24-hr3.016.11 3148_3147 Existing2-yr, 24-hr21.924.79 10-yr, 24-hr27.465.49 25-yr, 24-hr27.835.57 50-yr, 24-hr29.356.1 100-yr, 24-hr29.646.15 Future2-yr, 24-hr21.934.79 10-yr, 24-hr27.45.48 25-yr, 24-hr27.685.54 50-yr, 24-hr28.395.74 100-yr, 24-hr28.525.79 Pre-Development2-yr, 24-hr14.324.09 10-yr, 24-hr25.725.19 Page 18 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr26.525.32 50-yr, 24-hr28.135.65 100-yr, 24-hr28.885.96 3119_3118 Existing2-yr, 24-hr2.544.99 10-yr, 24-hr2.744.99 25-yr, 24-hr2.765.01 50-yr, 24-hr2.825.1 100-yr, 24-hr2.855.14 Future2-yr, 24-hr2.544.99 10-yr, 24-hr2.744.98 25-yr, 24-hr2.765.01 50-yr, 24-hr2.825.1 100-yr, 24-hr2.845.14 Pre-Development2-yr, 24-hr1.734.97 10-yr, 24-hr2.685.21 25-yr, 24-hr2.715.23 50-yr, 24-hr2.795.15 100-yr, 24-hr2.825.16 3118_3117 Existing2-yr, 24-hr2.364.35 10-yr, 24-hr2.354.36 25-yr, 24-hr2.384.36 50-yr, 24-hr2.384.35 100-yr, 24-hr2.374.33 Future2-yr, 24-hr2.364.34 10-yr, 24-hr2.384.36 25-yr, 24-hr2.384.36 50-yr, 24-hr2.384.35 100-yr, 24-hr2.374.33 Pre-Development2-yr, 24-hr1.74.45 10-yr, 24-hr2.44.48 25-yr, 24-hr2.394.48 50-yr, 24-hr2.394.47 100-yr, 24-hr2.44.48 3117_3116 Existing2-yr, 24-hr3.155.57 10-yr, 24-hr3.235.68 25-yr, 24-hr3.245.69 50-yr, 24-hr3.295.77 100-yr, 24-hr3.325.81 Future2-yr, 24-hr3.155.57 10-yr, 24-hr3.235.68 25-yr, 24-hr3.245.69 50-yr, 24-hr3.295.76 100-yr, 24-hr3.315.79 Pre-Development2-yr, 24-hr2.754.98 10-yr, 24-hr3.25.64 25-yr, 24-hr3.215.65 50-yr, 24-hr3.255.71 100-yr, 24-hr3.285.75 3116_2961 Existing2-yr, 24-hr3.155.7 10-yr, 24-hr3.235.83 25-yr, 24-hr3.245.84 50-yr, 24-hr3.275.88 100-yr, 24-hr3.285.91 Future2-yr, 24-hr3.155.7 10-yr, 24-hr3.235.83 25-yr, 24-hr3.245.85 50-yr, 24-hr3.285.9 100-yr, 24-hr3.315.94 Pre-Development2-yr, 24-hr2.755.29 10-yr, 24-hr3.25.77 25-yr, 24-hr3.215.79 50-yr, 24-hr3.255.85 100-yr, 24-hr3.265.87 2961_3153 Existing2-yr, 24-hr3.154.01 10-yr, 24-hr3.244.1 25-yr, 24-hr3.254.11 50-yr, 24-hr3.274.13 100-yr, 24-hr3.294.15 Future2-yr, 24-hr3.154.01 10-yr, 24-hr3.244.1 25-yr, 24-hr3.254.11 50-yr, 24-hr3.284.14 100-yr, 24-hr3.314.17 Pre-Development2-yr, 24-hr2.753.52 10-yr, 24-hr3.24.06 Page 19 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr3.214.08 50-yr, 24-hr3.254.11 100-yr, 24-hr3.264.12 3153_3522 Existing2-yr, 24-hr3.153.86 10-yr, 24-hr3.244.06 25-yr, 24-hr3.254.13 50-yr, 24-hr3.274.17 100-yr, 24-hr3.294.18 Future2-yr, 24-hr3.153.86 10-yr, 24-hr3.244.05 25-yr, 24-hr3.254.14 50-yr, 24-hr3.294.17 100-yr, 24-hr3.324.21 Pre-Development2-yr, 24-hr2.753.76 10-yr, 24-hr3.23.94 25-yr, 24-hr3.213.97 50-yr, 24-hr3.254.14 100-yr, 24-hr3.274.16 3522_2805 Existing2-yr, 24-hr3.154.22 10-yr, 24-hr3.244.27 25-yr, 24-hr3.254.27 50-yr, 24-hr3.274.28 100-yr, 24-hr3.284.28 Future2-yr, 24-hr3.154.22 10-yr, 24-hr3.244.26 25-yr, 24-hr3.274.28 50-yr, 24-hr3.314.28 100-yr, 24-hr3.344.27 Pre-Development2-yr, 24-hr2.744.02 10-yr, 24-hr3.24.25 25-yr, 24-hr3.214.25 50-yr, 24-hr3.254.27 100-yr, 24-hr3.264.28 2805_3147 Existing2-yr, 24-hr3.155.71 10-yr, 24-hr3.245.75 25-yr, 24-hr3.255.75 50-yr, 24-hr3.275.76 100-yr, 24-hr3.295.76 Future2-yr, 24-hr3.155.71 10-yr, 24-hr3.265.74 25-yr, 24-hr3.275.73 50-yr, 24-hr3.365.73 100-yr, 24-hr3.45.73 Pre-Development2-yr, 24-hr2.745.55 10-yr, 24-hr3.25.73 25-yr, 24-hr3.215.74 50-yr, 24-hr3.255.75 100-yr, 24-hr3.265.75 2890_3147 Existing2-yr, 24-hr00 10-yr, 24-hr00 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr00 Future2-yr, 24-hr00 10-yr, 24-hr-21.11 25-yr, 24-hr-1.641.61 50-yr, 24-hr-1.642.29 100-yr, 24-hr-1.72.4 Pre-Development2-yr, 24-hr00 10-yr, 24-hr00 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr00 3147_3146 Existing2-yr, 24-hr25.036.62 10-yr, 24-hr30.636.77 25-yr, 24-hr30.996.78 50-yr, 24-hr32.486.78 100-yr, 24-hr32.776.78 Future2-yr, 24-hr25.046.62 10-yr, 24-hr30.546.77 25-yr, 24-hr30.826.77 50-yr, 24-hr31.486.78 100-yr, 24-hr31.656.78 Pre-Development2-yr, 24-hr16.996.2 10-yr, 24-hr28.846.75 Page 20 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr29.646.75 50-yr, 24-hr31.276.78 100-yr, 24-hr32.026.79 3120_2960 Existing2-yr, 24-hr3.285.92 10-yr, 24-hr3.486.19 25-yr, 24-hr3.496.21 50-yr, 24-hr3.526.25 100-yr, 24-hr3.566.31 Future2-yr, 24-hr3.295.93 10-yr, 24-hr3.486.18 25-yr, 24-hr3.496.21 50-yr, 24-hr3.526.25 100-yr, 24-hr3.566.3 Pre-Development2-yr, 24-hr1.514.21 10-yr, 24-hr3.386.05 25-yr, 24-hr3.416.07 50-yr, 24-hr3.496.21 100-yr, 24-hr3.56.22 2960_1143 Existing2-yr, 24-hr3.294.56 10-yr, 24-hr3.484.6 25-yr, 24-hr3.494.57 50-yr, 24-hr3.534.61 100-yr, 24-hr3.564.62 Future2-yr, 24-hr3.294.57 10-yr, 24-hr3.484.63 25-yr, 24-hr3.494.59 50-yr, 24-hr3.524.54 100-yr, 24-hr3.564.57 Pre-Development2-yr, 24-hr1.514.02 10-yr, 24-hr3.384.57 25-yr, 24-hr3.414.58 50-yr, 24-hr3.494.6 100-yr, 24-hr3.54.61 1143_3146 Existing2-yr, 24-hr3.295.5 10-yr, 24-hr3.485.54 25-yr, 24-hr3.495.54 50-yr, 24-hr3.535.55 100-yr, 24-hr3.565.56 Future2-yr, 24-hr3.295.5 10-yr, 24-hr3.485.54 25-yr, 24-hr3.495.54 50-yr, 24-hr3.525.55 100-yr, 24-hr3.565.56 Pre-Development2-yr, 24-hr1.514.6 10-yr, 24-hr3.385.52 25-yr, 24-hr3.415.52 50-yr, 24-hr3.495.54 100-yr, 24-hr3.55.55 3146_2799 Existing2-yr, 24-hr28.296.87 10-yr, 24-hr34.035.14 25-yr, 24-hr34.45.16 50-yr, 24-hr35.815.19 100-yr, 24-hr36.245.23 Future2-yr, 24-hr28.36.87 10-yr, 24-hr33.875.13 25-yr, 24-hr34.165.14 50-yr, 24-hr34.765.17 100-yr, 24-hr34.855.18 Pre-Development2-yr, 24-hr18.484.19 10-yr, 24-hr32.145.04 25-yr, 24-hr32.945.08 50-yr, 24-hr34.645.17 100-yr, 24-hr35.245.2 2799_2800 Existing2-yr, 24-hr28.296.75 10-yr, 24-hr34.047.06 25-yr, 24-hr34.427.08 50-yr, 24-hr35.827.14 100-yr, 24-hr36.27.15 Future2-yr, 24-hr28.36.75 10-yr, 24-hr34.877.04 25-yr, 24-hr39.217.06 50-yr, 24-hr34.637.09 100-yr, 24-hr34.667.08 Pre-Development2-yr, 24-hr18.486.05 10-yr, 24-hr32.156.97 Page 21 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr32.947.01 50-yr, 24-hr34.647.09 100-yr, 24-hr35.237.12 3526_3292 Existing2-yr, 24-hr1.334.59 10-yr, 24-hr1.814.81 25-yr, 24-hr1.834.84 50-yr, 24-hr1.784.72 100-yr, 24-hr1.784.73 Future2-yr, 24-hr1.324.59 10-yr, 24-hr1.814.81 25-yr, 24-hr1.834.84 50-yr, 24-hr1.784.72 100-yr, 24-hr1.784.73 Pre-Development2-yr, 24-hr0.854.25 10-yr, 24-hr1.824.83 25-yr, 24-hr1.844.88 50-yr, 24-hr1.884.98 100-yr, 24-hr1.854.93 3292_3291 Existing2-yr, 24-hr1.274.4 10-yr, 24-hr1.764.75 25-yr, 24-hr1.764.75 50-yr, 24-hr1.764.73 100-yr, 24-hr1.764.74 Future2-yr, 24-hr1.284.4 10-yr, 24-hr1.764.75 25-yr, 24-hr1.764.75 50-yr, 24-hr1.764.73 100-yr, 24-hr1.764.74 Pre-Development2-yr, 24-hr0.844.37 10-yr, 24-hr1.774.76 25-yr, 24-hr1.774.76 50-yr, 24-hr1.774.77 100-yr, 24-hr1.774.77 3291_3290 Existing2-yr, 24-hr1.282.99 10-yr, 24-hr1.763.26 25-yr, 24-hr1.763.21 50-yr, 24-hr1.753.3 100-yr, 24-hr1.793.37 Future2-yr, 24-hr1.282.99 10-yr, 24-hr1.762.98 25-yr, 24-hr1.763 50-yr, 24-hr1.753.08 100-yr, 24-hr1.763.13 Pre-Development2-yr, 24-hr0.843.16 10-yr, 24-hr1.773.49 25-yr, 24-hr1.773.5 50-yr, 24-hr1.773.47 100-yr, 24-hr1.773.48 3290_3289 Existing2-yr, 24-hr4.135.11 10-yr, 24-hr4.225.22 25-yr, 24-hr4.25.19 50-yr, 24-hr4.225.18 100-yr, 24-hr4.255.21 Future2-yr, 24-hr4.145.12 10-yr, 24-hr4.225.22 25-yr, 24-hr4.195.19 50-yr, 24-hr4.195.18 100-yr, 24-hr4.215.21 Pre-Development2-yr, 24-hr1.984.22 10-yr, 24-hr4.225.22 25-yr, 24-hr4.225.22 50-yr, 24-hr4.245.25 100-yr, 24-hr4.235.23 3289_3524 Existing2-yr, 24-hr4.15.12 10-yr, 24-hr4.195.78 25-yr, 24-hr4.175.72 50-yr, 24-hr4.225.22 100-yr, 24-hr4.255.24 Future2-yr, 24-hr4.125.14 10-yr, 24-hr4.195.78 25-yr, 24-hr4.165.72 50-yr, 24-hr4.165.19 100-yr, 24-hr4.175.21 Pre-Development2-yr, 24-hr1.982.81 10-yr, 24-hr4.175.77 Page 22 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr4.185.71 50-yr, 24-hr4.195.24 100-yr, 24-hr4.215.24 3525_3524 Existing2-yr, 24-hr-0.080.11 10-yr, 24-hr0.190.34 25-yr, 24-hr0.170.29 50-yr, 24-hr0.220.37 100-yr, 24-hr0.230.39 Future2-yr, 24-hr-0.090.11 10-yr, 24-hr0.370.47 25-yr, 24-hr0.370.45 50-yr, 24-hr0.60.98 100-yr, 24-hr0.541.09 Pre-Development2-yr, 24-hr-0.020.07 10-yr, 24-hr0.160.2 25-yr, 24-hr-0.180.27 50-yr, 24-hr-0.210.33 100-yr, 24-hr0.220.39 3524_3523 Existing2-yr, 24-hr4.035.08 10-yr, 24-hr4.155.2 25-yr, 24-hr4.175.22 50-yr, 24-hr4.225.28 100-yr, 24-hr4.255.3 Future2-yr, 24-hr4.055.11 10-yr, 24-hr4.135.19 25-yr, 24-hr4.115.18 50-yr, 24-hr4.15.17 100-yr, 24-hr4.125.18 Pre-Development2-yr, 24-hr1.983.16 10-yr, 24-hr4.115.17 25-yr, 24-hr4.115.17 50-yr, 24-hr4.185.22 100-yr, 24-hr4.215.26 3523_2798 Existing2-yr, 24-hr3.985.2 10-yr, 24-hr4.155.24 25-yr, 24-hr4.175.26 50-yr, 24-hr4.225.32 100-yr, 24-hr4.255.35 Future2-yr, 24-hr3.985.19 10-yr, 24-hr4.095.19 25-yr, 24-hr4.095.17 50-yr, 24-hr4.095.18 100-yr, 24-hr4.15.19 Pre-Development2-yr, 24-hr1.974.66 10-yr, 24-hr4.085.17 25-yr, 24-hr4.115.19 50-yr, 24-hr4.185.27 100-yr, 24-hr4.215.3 2798_2801 Existing2-yr, 24-hr3.985.09 10-yr, 24-hr4.155.29 25-yr, 24-hr4.175.31 50-yr, 24-hr4.225.37 100-yr, 24-hr4.255.4 Future2-yr, 24-hr3.985.09 10-yr, 24-hr4.235.38 25-yr, 24-hr4.135.23 50-yr, 24-hr4.25.28 100-yr, 24-hr4.095.22 Pre-Development2-yr, 24-hr1.974.57 10-yr, 24-hr4.085.21 25-yr, 24-hr4.115.24 50-yr, 24-hr4.185.32 100-yr, 24-hr4.215.35 1138_2801 Existing2-yr, 24-hr00 10-yr, 24-hr00 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr00 Future2-yr, 24-hr00 10-yr, 24-hr00 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr00 Pre-Development2-yr, 24-hr00 10-yr, 24-hr00 Page 23 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr00 2801_2800 Existing2-yr, 24-hr3.986.61 10-yr, 24-hr4.166.68 25-yr, 24-hr4.176.69 50-yr, 24-hr4.236.71 100-yr, 24-hr4.256.72 Future2-yr, 24-hr3.986.61 10-yr, 24-hr4.336.65 25-yr, 24-hr76.65 50-yr, 24-hr6.836.65 100-yr, 24-hr7.296.65 Pre-Development2-yr, 24-hr1.975.47 10-yr, 24-hr4.086.65 25-yr, 24-hr4.116.66 50-yr, 24-hr4.186.69 100-yr, 24-hr4.216.7 2800_3459 Existing2-yr, 24-hr32.277.25 10-yr, 24-hr38.137.54 25-yr, 24-hr38.537.55 50-yr, 24-hr39.997.59 100-yr, 24-hr40.317.6 Future2-yr, 24-hr32.287.25 10-yr, 24-hr49.227.76 25-yr, 24-hr51.777.53 50-yr, 24-hr48.547.65 100-yr, 24-hr38.567.54 Pre-Development2-yr, 24-hr20.456.45 10-yr, 24-hr36.167.45 25-yr, 24-hr36.977.48 50-yr, 24-hr38.717.56 100-yr, 24-hr39.347.59 3459_2894 Existing2-yr, 24-hr32.2710.04 10-yr, 24-hr38.4110.07 25-yr, 24-hr38.810.05 50-yr, 24-hr40.510.08 100-yr, 24-hr40.810.1 Future2-yr, 24-hr32.2810.04 10-yr, 24-hr81.4810.07 25-yr, 24-hr82.2510.05 50-yr, 24-hr84.5210.08 100-yr, 24-hr86.1610.17 Pre-Development2-yr, 24-hr20.459.05 10-yr, 24-hr36.1710.17 25-yr, 24-hr36.9610.17 50-yr, 24-hr39.0210.14 100-yr, 24-hr39.4610.12 2894_3530 Existing2-yr, 24-hr32.278.76 10-yr, 24-hr38.918.7 25-yr, 24-hr39.148.73 50-yr, 24-hr40.618.77 100-yr, 24-hr40.778.76 Future2-yr, 24-hr32.288.77 10-yr, 24-hr81.2116.1 25-yr, 24-hr81.7716.2 50-yr, 24-hr84.1616.65 100-yr, 24-hr85.6216.93 Pre-Development2-yr, 24-hr20.457.98 10-yr, 24-hr36.158.81 25-yr, 24-hr36.878.81 50-yr, 24-hr39.558.8 100-yr, 24-hr39.738.77 3530_2488 Existing2-yr, 24-hr32.278.66 10-yr, 24-hr38.048.58 25-yr, 24-hr38.758.61 50-yr, 24-hr40.338.65 100-yr, 24-hr40.788.62 Future2-yr, 24-hr32.288.66 10-yr, 24-hr81.216.19 25-yr, 24-hr81.7916.3 50-yr, 24-hr84.0216.71 100-yr, 24-hr85.3516.97 Pre-Development2-yr, 24-hr20.457.86 10-yr, 24-hr36.148.7 Page 24 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr36.848.7 50-yr, 24-hr38.78.66 100-yr, 24-hr39.548.63 2488_BC3A Existing2-yr, 24-hr251.485.84 10-yr, 24-hr620.937.59 25-yr, 24-hr692.827.82 50-yr, 24-hr934.838.48 100-yr, 24-hr1071.448.57 Future2-yr, 24-hr251.495.84 10-yr, 24-hr832.557.36 25-yr, 24-hr-978.97.42 50-yr, 24-hr-2095.817.55 100-yr, 24-hr-2701.758.27 Pre-Development2-yr, 24-hr102.094.21 10-yr, 24-hr385.356.79 25-yr, 24-hr437.986.93 50-yr, 24-hr610.857.49 100-yr, 24-hr724.567.89 L-BC3A-H11 Existing2-yr, 24-hr286.235.54 10-yr, 24-hr681.756.6 25-yr, 24-hr760.856.64 50-yr, 24-hr1014.746.75 100-yr, 24-hr1162.56.69 Future2-yr, 24-hr286.225.54 10-yr, 24-hr877.16.6 25-yr, 24-hr989.676.64 50-yr, 24-hr-20087.41 100-yr, 24-hr-2601.777.76 Pre-Development2-yr, 24-hr116.83.93 10-yr, 24-hr425.916.01 25-yr, 24-hr478.496.09 50-yr, 24-hr668.946.26 100-yr, 24-hr798.746.33 L-EG1D-EG1C Existing2-yr, 24-hr159.834.53 10-yr, 24-hr459.296.62 25-yr, 24-hr524.496.93 50-yr, 24-hr753.397.81 100-yr, 24-hr892.648.01 Future2-yr, 24-hr159.814.53 10-yr, 24-hr616.986.49 25-yr, 24-hr528.656.58 50-yr, 24-hr843.786.82 100-yr, 24-hr931.096.94 Pre-Development2-yr, 24-hr93.163.71 10-yr, 24-hr367.026.18 25-yr, 24-hr423.576.49 50-yr, 24-hr616.617.38 100-yr, 24-hr730.797.81 L-EG1C-H10 Existing2-yr, 24-hr189.063.12 10-yr, 24-hr546.844.76 25-yr, 24-hr621.765 50-yr, 24-hr876.845.61 100-yr, 24-hr990.75.67 Future2-yr, 24-hr189.153.12 10-yr, 24-hr673.454.64 25-yr, 24-hr621.174.71 50-yr, 24-hr967.24.93 100-yr, 24-hr1082.515.31 Pre-Development2-yr, 24-hr108.892.55 10-yr, 24-hr420.264.44 25-yr, 24-hr482.734.69 50-yr, 24-hr693.325.37 100-yr, 24-hr817.895.7 L-EG1G-H12 Existing2-yr, 24-hr20.171.69 10-yr, 24-hr42.752.09 25-yr, 24-hr46.512.14 50-yr, 24-hr58.62.25 100-yr, 24-hr65.492.31 Future2-yr, 24-hr20.171.69 10-yr, 24-hr-467.312.09 25-yr, 24-hr-198.482.13 50-yr, 24-hr-387.542.23 100-yr, 24-hr-476.922.27 Pre-Development2-yr, 24-hr9.531.28 10-yr, 24-hr28.431.87 Page 25 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr314.8110.53 50-yr, 24-hr460.4611.96 100-yr, 24-hr551.5712.67 L-H12-H10 Existing2-yr, 24-hr187.374.94 10-yr, 24-hr471.846.26 25-yr, 24-hr525.946.39 50-yr, 24-hr705.56.61 100-yr, 24-hr738.476.66 Future2-yr, 24-hr187.344.94 10-yr, 24-hr834.156.14 25-yr, 24-hr501.516.18 50-yr, 24-hr691.726.26 100-yr, 24-hr797.316.25 Pre-Development2-yr, 24-hr84.53.69 10-yr, 24-hr301.85.48 25-yr, 24-hr341.535.69 50-yr, 24-hr502.586.15 100-yr, 24-hr600.786.33 L-H10-H18 Existing2-yr, 24-hr372.196.9 10-yr, 24-hr1012.189.42 25-yr, 24-hr1140.29.73 50-yr, 24-hr1568.0410.45 100-yr, 24-hr1659.6710.5 Future2-yr, 24-hr372.126.9 10-yr, 24-hr1121.118.95 25-yr, 24-hr1181.489.04 50-yr, 24-hr1564.949.22 100-yr, 24-hr1830.479.2 Pre-Development2-yr, 24-hr191.675.46 10-yr, 24-hr721.18.6 25-yr, 24-hr823.298.91 50-yr, 24-hr1169.299.88 100-yr, 24-hr1408.5610.29 L-EG2B-H18 Existing2-yr, 24-hr11.170.3 10-yr, 24-hr22.830.37 25-yr, 24-hr25.310.38 50-yr, 24-hr47.20.39 100-yr, 24-hr202.111.01 Future2-yr, 24-hr11.060.3 10-yr, 24-hr-597.621.9 25-yr, 24-hr669.743.3 50-yr, 24-hr-626.582.37 100-yr, 24-hr-735.382.51 Pre-Development2-yr, 24-hr3.20.19 10-yr, 24-hr14.090.2 25-yr, 24-hr16.210.21 50-yr, 24-hr22.950.22 100-yr, 24-hr26.850.23 L-H18-H11 Existing2-yr, 24-hr382.276.42 10-yr, 24-hr1027.978.07 25-yr, 24-hr1158.688.16 50-yr, 24-hr1554.458.33 100-yr, 24-hr1688.028.4 Future2-yr, 24-hr382.216.42 10-yr, 24-hr1181.797.9 25-yr, 24-hr1054.617.97 50-yr, 24-hr1590.828.05 100-yr, 24-hr1857.668.68 Pre-Development2-yr, 24-hr194.325.08 10-yr, 24-hr731.987.79 25-yr, 24-hr831.957.92 50-yr, 24-hr1187.128.35 100-yr, 24-hr1427.058.43 L-H11-EG2D Existing2-yr, 24-hr666.146.92 10-yr, 24-hr1430.177.69 25-yr, 24-hr1443.337.7 50-yr, 24-hr1463.647.57 100-yr, 24-hr1469.877.58 Future2-yr, 24-hr666.056.92 10-yr, 24-hr1240.027.69 25-yr, 24-hr1359.637.7 50-yr, 24-hr1568.057.69 100-yr, 24-hr1600.737.88 Pre-Development2-yr, 24-hr309.635.24 10-yr, 24-hr1125.87.43 Page 27 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr1307.567.45 50-yr, 24-hr1446.127.53 100-yr, 24-hr1457.977.57 L-EG2D-H6 Existing2-yr, 24-hr783.887.57 10-yr, 24-hr1564.17.77 25-yr, 24-hr1589.517.89 50-yr, 24-hr1652.858.2 100-yr, 24-hr1689.138.38 Future2-yr, 24-hr783.897.57 10-yr, 24-hr1358.167.76 25-yr, 24-hr1681.728.17 50-yr, 24-hr206510.14 100-yr, 24-hr2411.2211.63 Pre-Development2-yr, 24-hr344.426.25 10-yr, 24-hr1244.137.08 25-yr, 24-hr1400.967 50-yr, 24-hr1549.117.69 100-yr, 24-hr1577.077.83 L-EG2A-2C Existing2-yr, 24-hr72.76.97 10-yr, 24-hr214.7410.88 25-yr, 24-hr245.5711.36 50-yr, 24-hr347.2512.73 100-yr, 24-hr407.0113.42 Future2-yr, 24-hr72.646.97 10-yr, 24-hr214.6610.05 25-yr, 24-hr245.2310.14 50-yr, 24-hr476.0110.45 100-yr, 24-hr545.2710.55 Pre-Development2-yr, 24-hr72.257.01 10-yr, 24-hr213.5910.83 25-yr, 24-hr243.9511.37 50-yr, 24-hr345.812.79 100-yr, 24-hr405.7813.47 L-H19-EG2C Existing2-yr, 24-hr00 10-yr, 24-hr00 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr00 Future2-yr, 24-hr00 10-yr, 24-hr00 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr-355.580.82 Pre-Development2-yr, 24-hr00 10-yr, 24-hr00 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr00 L-EG2C-2E Existing2-yr, 24-hr102.833.6 10-yr, 24-hr335.926.43 25-yr, 24-hr383.536.77 50-yr, 24-hr538.557.76 100-yr, 24-hr626.868.22 Future2-yr, 24-hr102.743.6 10-yr, 24-hr321.516.36 25-yr, 24-hr371.696.44 50-yr, 24-hr526.86.76 100-yr, 24-hr612.746.54 Pre-Development2-yr, 24-hr96.534.22 10-yr, 24-hr4057.03 25-yr, 24-hr443.117.33 50-yr, 24-hr521.587.69 100-yr, 24-hr610.968.16 L-EG2E-H6 Existing2-yr, 24-hr133.892.14 10-yr, 24-hr339.742.05 25-yr, 24-hr385.922.11 50-yr, 24-hr551.692.75 100-yr, 24-hr623.213.09 Future2-yr, 24-hr134.442.14 10-yr, 24-hr641.113.11 25-yr, 24-hr-811.163.5 50-yr, 24-hr845.773.97 100-yr, 24-hr-1046.095 Pre-Development2-yr, 24-hr111.853.27 10-yr, 24-hr443.913.62 Page 28 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr32.211.93 50-yr, 24-hr44.692.1 100-yr, 24-hr51.882.17 L-EG1B-1A Existing2-yr, 24-hr69.314.76 10-yr, 24-hr199.257.17 25-yr, 24-hr226.37.53 50-yr, 24-hr318.928.56 100-yr, 24-hr374.219.07 Future2-yr, 24-hr69.34.76 10-yr, 24-hr199.257.17 25-yr, 24-hr226.127.53 50-yr, 24-hr380.738.34 100-yr, 24-hr418.578.72 Pre-Development2-yr, 24-hr27.783.32 10-yr, 24-hr136.056.26 25-yr, 24-hr157.096.61 50-yr, 24-hr227.837.61 100-yr, 24-hr268.988.1 L-EG1A-H9 Existing2-yr, 24-hr123.123.06 10-yr, 24-hr313.975.09 25-yr, 24-hr351.25.41 50-yr, 24-hr476.866.52 100-yr, 24-hr550.97.08 Future2-yr, 24-hr123.123.06 10-yr, 24-hr319.145.16 25-yr, 24-hr350.815.5 50-yr, 24-hr478.356.42 100-yr, 24-hr539.936.51 Pre-Development2-yr, 24-hr53.341.83 10-yr, 24-hr203.44.04 25-yr, 24-hr231.344.33 50-yr, 24-hr339.595.31 100-yr, 24-hr408.175.89 L-EG1F-H9 Existing2-yr, 24-hr41.030.54 10-yr, 24-hr99.650.54 25-yr, 24-hr109.780.57 50-yr, 24-hr146.170.71 100-yr, 24-hr166.950.78 Future2-yr, 24-hr41.50.54 10-yr, 24-hr4359.821.57 25-yr, 24-hr474.122.34 50-yr, 24-hr256.781.25 100-yr, 24-hr210.871.05 Pre-Development2-yr, 24-hr24.780.41 10-yr, 24-hr61.490.37 25-yr, 24-hr69.30.4 50-yr, 24-hr95.430.51 100-yr, 24-hr113.590.57 L-H9-EG1E Existing2-yr, 24-hr161.342.78 10-yr, 24-hr408.894.32 25-yr, 24-hr456.84.55 50-yr, 24-hr619.075.23 100-yr, 24-hr714.385.59 Future2-yr, 24-hr161.312.78 10-yr, 24-hr1237.326.09 25-yr, 24-hr584.554.5 50-yr, 24-hr676.114.75 100-yr, 24-hr755.544.84 Pre-Development2-yr, 24-hr71.261.87 10-yr, 24-hr263.733.52 25-yr, 24-hr299.483.73 50-yr, 24-hr431.194.42 100-yr, 24-hr517.834.82 L-EG1E-H12 Existing2-yr, 24-hr168.318.44 10-yr, 24-hr431.4311.77 25-yr, 24-hr481.9912.2 50-yr, 24-hr652.4513.41 100-yr, 24-hr751.8613.7 Future2-yr, 24-hr168.288.44 10-yr, 24-hr1139.6411.57 25-yr, 24-hr611.5711.73 50-yr, 24-hr680.5112.11 100-yr, 24-hr744.612.23 Pre-Development2-yr, 24-hr75.466.23 10-yr, 24-hr277.5610.08 Page 26 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr476.643.55 50-yr, 24-hr518.383.33 100-yr, 24-hr622.623.44 L-H6-H7 Existing2-yr, 24-hr898.486.37 10-yr, 24-hr1324.326.92 25-yr, 24-hr1326.136.92 50-yr, 24-hr1325.216.84 100-yr, 24-hr1321.766.87 Future2-yr, 24-hr898.576.37 10-yr, 24-hr1609.187.85 25-yr, 24-hr1635.047.98 50-yr, 24-hr1666.198.1 100-yr, 24-hr1671.658.12 Pre-Development2-yr, 24-hr450.345.18 10-yr, 24-hr1331.756.96 25-yr, 24-hr1336.666.98 50-yr, 24-hr1339.627.04 100-yr, 24-hr1341.147.05 L-H7-EG3A Existing2-yr, 24-hr932.715.95 10-yr, 24-hr1328.766.62 25-yr, 24-hr1336.216.65 50-yr, 24-hr1330.146.63 100-yr, 24-hr1324.396.61 Future2-yr, 24-hr932.635.95 10-yr, 24-hr1682.98.31 25-yr, 24-hr1708.248.45 50-yr, 24-hr1748.238.65 100-yr, 24-hr1751.088.65 Pre-Development2-yr, 24-hr456.684.71 10-yr, 24-hr1348.136.62 25-yr, 24-hr1349.26.68 50-yr, 24-hr1361.716.75 100-yr, 24-hr13646.76 L-EG3A-4C Existing2-yr, 24-hr940.316.09 10-yr, 24-hr1314.876.54 25-yr, 24-hr1317.036.54 50-yr, 24-hr1323.466.58 100-yr, 24-hr1335.076.64 Future2-yr, 24-hr940.266.09 10-yr, 24-hr17008.42 25-yr, 24-hr1725.88.55 50-yr, 24-hr1773.198.79 100-yr, 24-hr1768.328.76 Pre-Development2-yr, 24-hr458.644.64 10-yr, 24-hr1349.066.68 25-yr, 24-hr1351.736.68 50-yr, 24-hr1359.376.69 100-yr, 24-hr1360.856.68 L-EG5B-4A Existing2-yr, 24-hr87.14.19 10-yr, 24-hr189.055.27 25-yr, 24-hr207.795.34 50-yr, 24-hr282.15.47 100-yr, 24-hr326.535.69 Future2-yr, 24-hr87.084.19 10-yr, 24-hr293.875.21 25-yr, 24-hr279.075.26 50-yr, 24-hr422.75.39 100-yr, 24-hr376.345.39 Pre-Development2-yr, 24-hr23.922.53 10-yr, 24-hr88.294.09 25-yr, 24-hr101.864.21 50-yr, 24-hr149.624.75 100-yr, 24-hr178.924.85 L-EG4A-4C Existing2-yr, 24-hr121.823.64 10-yr, 24-hr251.444.5 25-yr, 24-hr280.484.56 50-yr, 24-hr379.824.67 100-yr, 24-hr438.944.6 Future2-yr, 24-hr121.813.64 10-yr, 24-hr-510.984.51 25-yr, 24-hr-532.624.57 50-yr, 24-hr-574.124.7 100-yr, 24-hr-545.054.62 Pre-Development2-yr, 24-hr37.812.24 10-yr, 24-hr130.823.24 Page 29 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr142.613.47 50-yr, 24-hr208.93.83 100-yr, 24-hr249.584.01 L-EG4C-5G Existing2-yr, 24-hr1074.728.19 10-yr, 24-hr1490.38.86 25-yr, 24-hr1498.268.86 50-yr, 24-hr1517.378.85 100-yr, 24-hr1525.618.85 Future2-yr, 24-hr1074.618.19 10-yr, 24-hr1804.168.87 25-yr, 24-hr1821.518.87 50-yr, 24-hr1850.348.97 100-yr, 24-hr1850.858.97 Pre-Development2-yr, 24-hr498.976.25 10-yr, 24-hr1452.348.87 25-yr, 24-hr1483.218.87 50-yr, 24-hr1493.38.88 100-yr, 24-hr1497.528.88 L-EG5G-H4 Existing2-yr, 24-hr1101.018.19 10-yr, 24-hr1619.28.8 25-yr, 24-hr1460.018.8 50-yr, 24-hr1519.268.78 100-yr, 24-hr1959.519.77 Future2-yr, 24-hr1100.748.19 10-yr, 24-hr2120.1410.3 25-yr, 24-hr2311.9911.03 50-yr, 24-hr2169.510.47 100-yr, 24-hr2289.0710.93 Pre-Development2-yr, 24-hr510.896.37 10-yr, 24-hr1696.028.81 25-yr, 24-hr1831.439.13 50-yr, 24-hr1576.278.9 100-yr, 24-hr1512.848.91 L-H4-H3 Existing2-yr, 24-hr1105.198.51 10-yr, 24-hr1430.188.96 25-yr, 24-hr1402.658.97 50-yr, 24-hr1431.428.95 100-yr, 24-hr1421.248.95 Future2-yr, 24-hr1105.028.51 10-yr, 24-hr1882.19.2 25-yr, 24-hr2399.6211.31 50-yr, 24-hr1939.929.47 100-yr, 24-hr1994.349.75 Pre-Development2-yr, 24-hr512.096.76 10-yr, 24-hr1464.849.01 25-yr, 24-hr1424.519.02 50-yr, 24-hr1447.179.05 100-yr, 24-hr1446.799.05 L-H3-H2 Existing2-yr, 24-hr1248.58.38 10-yr, 24-hr1473.958.55 25-yr, 24-hr1474.238.55 50-yr, 24-hr1470.358.53 100-yr, 24-hr1468.48.55 Future2-yr, 24-hr1247.838.51 10-yr, 24-hr1798.548.96 25-yr, 24-hr1983.389.43 50-yr, 24-hr1831.048.95 100-yr, 24-hr1860.169.04 Pre-Development2-yr, 24-hr545.086.61 10-yr, 24-hr1451.428.73 25-yr, 24-hr1454.858.74 50-yr, 24-hr1460.378.74 100-yr, 24-hr1464.768.74 L-H13-GT1A Existing2-yr, 24-hr00 10-yr, 24-hr00 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr00 Future2-yr, 24-hr00 10-yr, 24-hr00 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr00 Pre-Development2-yr, 24-hr00 10-yr, 24-hr00 Page 30 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr00 50-yr, 24-hr00 100-yr, 24-hr00 L-EGT1A-1B Existing2-yr, 24-hr76.913.29 10-yr, 24-hr208.864.79 25-yr, 24-hr235.795.01 50-yr, 24-hr328.45.64 100-yr, 24-hr384.275.96 Future2-yr, 24-hr76.943.29 10-yr, 24-hr224.024.86 25-yr, 24-hr254.564.94 50-yr, 24-hr339.175.13 100-yr, 24-hr386.415.18 Pre-Development2-yr, 24-hr44.172.67 10-yr, 24-hr156.464.31 25-yr, 24-hr178.394.52 50-yr, 24-hr252.595.13 100-yr, 24-hr296.325.44 L-EGT1B-H1 Existing2-yr, 24-hr78.753.71 10-yr, 24-hr214.214.89 25-yr, 24-hr241.735.08 50-yr, 24-hr336.175.67 100-yr, 24-hr392.615.98 Future2-yr, 24-hr78.753.71 10-yr, 24-hr-262.554.9 25-yr, 24-hr-289.074.97 50-yr, 24-hr348.485.07 100-yr, 24-hr395.685.02 Pre-Development2-yr, 24-hr45.92.98 10-yr, 24-hr160.294.52 25-yr, 24-hr182.554.76 50-yr, 24-hr257.985.09 100-yr, 24-hr302.535.39 L-EGT2A-H1 Existing2-yr, 24-hr60.933.45 10-yr, 24-hr183.034.77 25-yr, 24-hr208.764.97 50-yr, 24-hr296.665.6 100-yr, 24-hr349.085.93 Future2-yr, 24-hr60.923.45 10-yr, 24-hr194.914.79 25-yr, 24-hr206.644.88 50-yr, 24-hr294.275.05 100-yr, 24-hr496.195.04 Pre-Development2-yr, 24-hr48.533.22 10-yr, 24-hr162.114.91 25-yr, 24-hr183.095.18 50-yr, 24-hr255.395.52 100-yr, 24-hr305.725.81 L-H1-H2 Existing2-yr, 24-hr136.923.27 10-yr, 24-hr383.424.27 25-yr, 24-hr437.254.34 50-yr, 24-hr620.224.46 100-yr, 24-hr727.414.78 Future2-yr, 24-hr136.923.36 10-yr, 24-hr442.334.62 25-yr, 24-hr438.634.71 50-yr, 24-hr613.884.76 100-yr, 24-hr713.664.59 Pre-Development2-yr, 24-hr93.213.19 10-yr, 24-hr314.84.68 25-yr, 24-hr359.514.9 50-yr, 24-hr505.85.15 100-yr, 24-hr590.655.27 L-H2-EG6A Existing2-yr, 24-hr1376.337.85 10-yr, 24-hr1540.387.91 25-yr, 24-hr1541.777.91 50-yr, 24-hr1545.127.91 100-yr, 24-hr1546.357.92 Future2-yr, 24-hr1377.539.11 10-yr, 24-hr2062.859.73 25-yr, 24-hr2096.839.85 50-yr, 24-hr2303.3510.5 100-yr, 24-hr2423.8510.82 Pre-Development2-yr, 24-hr634.047.19 10-yr, 24-hr1602.359.24 Page 31 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr1603.289.21 50-yr, 24-hr1597.759.17 100-yr, 24-hr1588.829.16 L-EG6A-H15 Existing2-yr, 24-hr257.795.42 10-yr, 24-hr259.725.45 25-yr, 24-hr259.925.46 50-yr, 24-hr273.575.68 100-yr, 24-hr275.975.72 Future2-yr, 24-hr1492.889.65 10-yr, 24-hr2517.4412.4 25-yr, 24-hr2624.5312.83 50-yr, 24-hr3002.1714.3 100-yr, 24-hr3261.9615.21 Pre-Development2-yr, 24-hr752.257.88 10-yr, 24-hr1826.3610.09 25-yr, 24-hr1830.9410.1 50-yr, 24-hr1840.2910.07 100-yr, 24-hr1843.7510.05 L-EG7H-H17 Existing2-yr, 24-hr143.485.17 10-yr, 24-hr346.535.15 25-yr, 24-hr388.095.18 50-yr, 24-hr533.995.26 100-yr, 24-hr697.225.22 Future2-yr, 24-hr143.355.17 10-yr, 24-hr346.535.15 25-yr, 24-hr387.935.18 50-yr, 24-hr532.555.26 100-yr, 24-hr802.815.21 Pre-Development2-yr, 24-hr44.793.51 10-yr, 24-hr164.94.3 25-yr, 24-hr192.864.32 50-yr, 24-hr293.84.42 100-yr, 24-hr357.694.47 L-EG7B-7C Existing2-yr, 24-hr63.383.17 10-yr, 24-hr191.854.7 25-yr, 24-hr218.144.9 50-yr, 24-hr309.125.45 100-yr, 24-hr453.437.8 Future2-yr, 24-hr63.353.17 10-yr, 24-hr191.744.84 25-yr, 24-hr2185.07 50-yr, 24-hr309.085.72 100-yr, 24-hr463.47.87 Pre-Development2-yr, 24-hr45.33.01 10-yr, 24-hr1654.83 25-yr, 24-hr190.085.07 50-yr, 24-hr278.125.77 100-yr, 24-hr331.816.03 L-EG7G-7C Existing2-yr, 24-hr80.483.69 10-yr, 24-hr209.25.07 25-yr, 24-hr235.125.24 50-yr, 24-hr327.795.84 100-yr, 24-hr472.757.99 Future2-yr, 24-hr80.473.69 10-yr, 24-hr209.155.16 25-yr, 24-hr235.045.38 50-yr, 24-hr327.656.04 100-yr, 24-hr477.528.03 Pre-Development2-yr, 24-hr24.522.13 10-yr, 24-hr116.514 25-yr, 24-hr136.964.26 50-yr, 24-hr210.884.99 100-yr, 24-hr257.225.27 L-EG7C-H17 Existing2-yr, 24-hr219.563.56 10-yr, 24-hr622.844.71 25-yr, 24-hr707.434.85 50-yr, 24-hr984.555.32 100-yr, 24-hr1093.95.44 Future2-yr, 24-hr219.483.56 10-yr, 24-hr623.565.2 25-yr, 24-hr707.355.42 50-yr, 24-hr1001.146.04 100-yr, 24-hr1182.656.21 Pre-Development2-yr, 24-hr121.333.1 10-yr, 24-hr464.355.12 Page 32 of 33 Max. FlowMax. NameScenario Storm Rate (cfs)Velocity (ft/s) 25-yr, 24-hr538.915.38 50-yr, 24-hr803.866.09 100-yr, 24-hr968.216.13 L-H17-H15 Existing2-yr, 24-hr362.15.77 10-yr, 24-hr966.677.62 25-yr, 24-hr1093.177.84 50-yr, 24-hr1501.78.55 100-yr, 24-hr1556.748.54 Future2-yr, 24-hr362.085.55 10-yr, 24-hr968.037.97 25-yr, 24-hr1092.868.32 50-yr, 24-hr1530.329.31 100-yr, 24-hr1801.699.56 Pre-Development2-yr, 24-hr165.024.27 10-yr, 24-hr627.76.91 25-yr, 24-hr729.897.34 50-yr, 24-hr1095.078.54 100-yr, 24-hr1323.398.66 Page 33 of 33 Bozeman Storm Water Facilities Plan Appendix D-1: Low Impact Development Appendix D-1: Low Impact Development D-1-1. Introduction Low impact development is a new approach to storm water management that focuses on managing rainfall and runoff at the source using a large number of runoff reduction and water quality BMPs. Related to low impact development is the LEED (Leadership in Energy and Environmental Design) rating system for “green” building development. The LEED rating system encourages low impact development practices by awarding “points” toward LEED certification. Although many low impact development BMPs rely on infiltration using, for example, porous pavement, many others can be effective in Bozeman’s climate. Refer to additional discussion below, including a more detailed description of the LEED certification program. D-1-2. Low Impact Development Low Impact Development (LID) is an innovative storm water management approach with a basic principle that is modeled after nature: Manage rainfall at the source using uniformly distributed decentralized micro-scale controls. LID's goal is to mimic a site's predevelopment hydrology by using design techniques that infiltrate, filter, store, evaporate, and detain runoff near its source. Techniques are based on the premise that storm water management should not be seen as storm water disposal. Instead of conveying and managing/treating storm water in large, costly end-of-pipe facilities located at the bottom of drainage areas, LID addresses storm water through small, cost-effective landscape features located at the lot level. These landscape features, known as Integrated Management Practices (IMPs), are the building blocks of LID. Almost all components of the urban environment have the potential to serve as an IMP. This includes not only open space, but also rooftops, streetscapes, parking lots, sidewalks, and medians. LID is a versatile approach that can be applied equally to new development, urban retrofits, and redevelopment/revitalization projects. In some cases, adoption of LID standards could lead to necessary revision of street standards. In all cases, LID should be designed carefully so not to introduce pest management issues, such as mosquito abatement, or other problems. If LID is adopted in Bozeman, the City should provide the Public Works Department with the flexibility to reject LID designs during project reviews. The term Low Impact Development (LID) has recently been used in conjunction with storm water management and is used in this report to refer to a set of tools and design guidelines that may reduce storm water runoff and assist with maintaining the natural hydrologic cycle. Research has shown that LID practices alone will not provide sufficient flood and erosion control. However, LID has been shown to decrease runoff when compared to conventional storm water management solutions and improve storm water quality. Those design techniques which may be beneficial to the City of Bozeman are described below. Site Design. New development and re-development can be designed to minimize storm water runoff and provide treatment on site by making relatively inexpensive design changes. These changes would be based on the LID concept of treating storm water as close to the source as practical, using discrete, simple facilities and minimizing large-scale storm water collection and conveyance. Examples of these changes include: • Trees planted in a park strip could be placed in existing low spots with curb cuts, and not in planters. D-1-1 Bozeman Storm Water Facilities Plan Typical Bioretention Area • Green spaces or open spaces adjacent to parking lots could be constructed to collect storm water runoff, not isolated by a curb, and placed at a lower elevation than the pavement. • Bioretention is a soil and plant based infiltration area, graded to receive runoff. Bioretention increases retention time and evapotranspiration, and thus helps control storm water. In areas of high groundwater, an underdrain should also be routed to a storm water collection system. Bioretention areas should be incorporated in new development whenever feasible. Tree Retention. Trees are beneficial to storm water management by attenuating runoff, providing added infiltration capabilities, soil stabilization, shade, and habitat. Tree retention could be accomplished through any of several methods used in other jurisdictions, including number of trees per acre for new development (for example, 220 trees per acre requirement in the Olympia, WA municipal code) or a certain percentage of tree cover in an area (for example, 60% tree cover is required in Issaquah, WA, a fast developing suburban area of Seattle near Issaquah Creek, which is critical to the Chinook Salmon population). The City of Lacey, WA adopted a Zero Impact Development (ZID) ordinance, in which a project adheres to the 60/0 development standard meaning 60% forest cover preserved and zero effective impervious surface. Another method of managing storm water through the use of trees is installation of ‘tree boxes’ (see the figure above). These should be designed with an underdrain system to infiltrate or convey excess runoff to another location. These can be an effective measure to hold, evaporate, and infiltrate storm water. Grass Swales. Grass swales can be used in place of curb and gutter in some areas. This allows runoff to infiltrate locally, where soils are permeable, and high volume flows should be channeled away. Soil Amendments. Normally, conventional site development earthwork practices remove the topsoil layer and landscape soils are not adequately prepared (LID, 2005). This activity removes critical organic material from the upper ground surface layers and reduces the tendency for storm water to infiltrate. Since the upper soil layers are critical to infiltrating and storing storm water runoff, the City of Bozeman could enact an ordinance to require organic soil amendments to encourage retention of the hydrologic benefits of native top soils. For D-1-2 Appendix D-1: Low Impact Development example, the soils at a recent low impact development design project were high in clay and standing water had been a constant problem. Approximately $200 of worms was added to the soils to enhance soil permeability. Storage was increased in the topsoil and infiltration was increased resulting in less ponding. This is a very low cost, organic, zero maintenance solution. Alternately, specifications can be developed to insure imported top soils used for landscaping are blended such that they support vegetation and provide an adequate grain size distribution for storm water infiltration. Rainwater Harvesting. Urbanized development that simulates a pre-development hydrologic condition is not possible for single-family housing without reducing the contribution of storm water runoff from rooftops. One effective way of reducing rooftop runoff is to collect and reuse this water. Harvested storm water runoff is commonly used for onsite landscape irrigation and building interior sewage conveyance (toilet flushing). The Banner Bank Building in Boise, Idaho, for example, is designed to use harvested storm water runoff for flushing toilets and urinals on all floors of this 11-story building and 100% of irrigation water needed for the site’s landscaping. Healthy Soil Structure (LID, 2005) D-1-3 Bozeman Storm Water Facilities Plan Storm Water Flows at Banner Bank Building (Gibney, 2005) Minimal Excavation Foundation Systems. Heavy equipment used for earthwork operations causes soil compaction and limits the natural capacity of an area to retain and absorb storm water runoff. Minimizing the use of heavy equipment during construction can improve the soils’ retention capacity by minimizing soil compaction and disturbance of the native soils. Native soils in some areas of Bozeman function better for storm water infiltration and retention prior to disturbance. One method of reducing the amount of heavy equipment necessary for building construction is through the construction of alternative foundation systems, such as Pin Foundations™. These systems provide structural bearing capacity with minimal disturbance to the native upper soil layers which infiltrate and store storm water while providing native soils for developing vegetation (LID, 2005). Another method is to limit construction disturbance to a portion of a site. Permeable Pavers. Alternative paving materials can be used to locally infiltrate rainwater and reduce the runoff leaving a site. Roads, sidewalks, and parking lots can be constructed using porous concrete and paving blocks. Permeable pavers could be problematic in areas with cold, snowy climates, such as Bozeman, due to snow removal and repetitive freeze-thaw cycles. However, this type of LID system has been used successfully in areas such as these when properly designed and when sand and gravel roadway maintenance operations are not conducted over this type of surface. Vegetated Roofs. Conventional urbanization consists of removal of natural, vegetated ground surface, and replaces this surface with an artificial, impervious paving or roofing. This change in surface condition increases the overall volume of storm water runoff as the collected precipitation does not infiltrate or evapo-transpire nearly as effectively as the natural setting. As a means of mitigating the effect of increased storm water runoff, some developments are constructing roof systems with vegetated cover to mimic the storm water storage and flow attenuation characteristics of an undeveloped condition. Vegetated roofs also reduce individual rooftop contribution to urban heat island effects. Low Impact Development Special Considerations. This chapter includes several specific LID techniques (BMP’s) that could be implemented in the City of Bozeman. However, it should be noted that these are not the only BMP’s available, nor will all those presented be appropriate to implement in all areas of the City. The City of Bozeman has numerous challenges to storm water management including high ground water, clay soils, cold weather, rain-on-snow storm events, and rapid population growth and development. For example, snow melt runoff should not be directed towards infiltration trenches or basins if groundwater contamination from chlorides or other sources is a concern. Low Impact Development design and implementation should be completed by a design professional with relevant, climate specific experience in LID, and care should be taken for proper implementation and function of those elements described above. D-1-3. LEED Certification Leadership in Energy and Environmental Design (LEED) Green Building Rating System was created by the United State Green Building Council (USGBC) as a means to weigh the levels of environmental sustainability of a particular building and site design. LEED projects may be awarded rating system points for environmental sustainability in the following categories: D-1-4 Appendix D-1: Low Impact Development • Sustainable Sites • Water Efficiency • Energy and Atmosphere • Materials and Resources • Indoor Environmental Quality • Innovation and Design Process LEED certification is often sought after by developers who seek to market their facilities to customers who are environmentally conscious. However, many developers have found that LEED practices produce tangible economic benefits. For example, reduced power consumption, particularly in a deregulated energy market, can lead to significant cost-savings for building owners and tenants. The use of indigenous materials supports the local economy, particularly in areas with abundant building resources. Storm water runoff treatment and control is accounted for mostly in the LEED Sustainable Sites Credit 6, Storm Water Management. A prerequisite to obtaining any credits in the Sustainable Sites category is Erosion and Sedimentation Control. Water efficient landscaping, innovative wastewater technologies, and water use reduction are also credits in the Water Efficiency Category that can be related to onsite storm water management. The City may consider encouraging LEED designs to be submitted within the City. This is consistent with the type of high-end development that is occurring and is expected to continue in Bozeman. Other communities, such as the City of Boise, Idaho and King County, Washington, have gone as far as to adopt a resolution for new City/County-owned buildings to be built “green” by requiring LEED certification. Projects which undergo LEED certification will almost assuredly be designed with best management practices from low impact development techniques. This results in minimal disruption to natural hydrologic cycle, improves runoff conditions as re-development occurs, and contributes to the overall quality of life in Bozeman. For more information on LEED and sustainable design, visit the USGBC website at http://www.usgbc.org/. Cold Weather Best Management Practices. The best management practices authorized under the City’s current Standards for Design and Construction are based upon common design practices by many storm water management jurisdictions at the time the standards were prepared. In the past few years several jurisdictions have dedicated time and resources to preparing storm water management tools, guidelines, and manuals. The Washington State Department of Ecology developed a storm water design manual for use by communities managing storm water in the semi-arid, continental climates found in Eastern Washington. Also, Storm water BMP Design Supplement for Cold Climates describes how to design storm water management best management practices to be more effective for cold climates. This manual reviews the applicability of specific water quantity and water quality BMP’s and compares the BMP’s most recommended by experts for application in cold climates. The graph below summarizes these recommendations as reported in Storm water BMP Design D-1-5 Bozeman Storm Water Facilities Plan Supplement for Cold Climates. BMP's Recommended in Cold Climates (Caraco and Claytor, 1997) D-1-4. Low Impact Development Recommendations Current Policy. The City currently does not have a policy with regard to low impact development. Recommended Policy Encourage developers to plant trees in existing low spots, and provide curb cuts for overflow during high runoff events. Encourage green spaces or open spaces to be constructed at a lower elevation than adjacent pavement, to collect storm water runoff, and convey it through un-paved areas. Curb cuts or flush curbs could be used between paved and un-paved areas. Promote sheet flow across grass or landscaped areas. This would provide a treatment benefit, as well as extended retention time and increased evapotranspiration. Require a fixed minimum percentage of tree cover in all landscaped areas, based on mature tree canopy size and taking into account overlap for closely planted trees. Encourage or allow the use of grass swales in addition to curb and gutter in some areas. This allows runoff to infiltrate locally, where soils are permeable, and high volume flows should be channeled away. Require organic soil amendments to encourage retention of the hydrologic benefits of native topsoils and enhance soil permeability. Develop D-1-6 Appendix D-1: Low Impact Development D-1-7 specifications ensure imported top soils used for landscaping are blended such that they support vegetation and provide an adequate grain size distribution for storm water infiltration. Normally, conventional site development earthwork practices remove the topsoil layer and landscape soils are not adequately prepared (LID, 2005). This activity removes critical organic material from the upper ground surface layers and reduces the tendency for storm water to infiltrate. Encourage LEED-certified construction. The Leadership in Energy and Environmental Design (LEED) Green Building Rating System awards points for storm water runoff treatment and control. Projects which undergo LEED certification will almost assuredly be designed with best management practices from low impact development techniques. Bozeman Storm Water Facilities Plan Appendix D: Storm Water Policy Bozeman Storm Water Facilities Plan Appendix D-2: Storm Water Management Best Management Practices Bozeman Storm Water Facilities Plan Appendix E: Infrastructure Rating System Alternatives Appendix E: Infrastructure Rating System Alternatives E.1 Introduction Whenever a noticeable defect in the pipe condition is identified during the TV inspection, a code should be assigned indicating the type and severity of the defect. For consistency in inspection and rating, specific storm water utility personnel should be assigned to develop, test and refine a rating system that can be carried through as staff turnover occurs. We recommend that you use a numerical condition rating system as described in E2, however a decision tree method is simpler and is described in E3. E.2 Example Condition Rating System Table E.2-1 presents an example table of impairment code, defect type, and the corresponding points assigned. The rating system should include pipe inlets, outlets & junctions. Table E.2-1 Existing City Standard Defect Codes and Point Values in Maintenance Software Co d e De f e c t Po i n t s Co d e De f e c t Po i n t s Broken Joint (BJ) Longitudinal Crack (LC) BJ-A Broken Joint (Light) 3 LC-D Long Crack – 1-2 Inches 3 BJ-B Broken Joint (Medium) 5 LC-E Long Crack – 3-5 Inches 7 BJ-C Broken Joint (Heavy) 7 LC-F Long Crack – >5 Inches 9 Structural Deterioration (SD) Misaligned Joint (MJ) DS-A Broken Pipe Light 3 MJ-D Wide Joint 1-2 Inches 3 DS-B Broken Pipe Medium 5 MJ-E Wide Joint 3-5 Inches 7 DS-C Broken Pipe Heavy 9 MJ-F Wide Joint >5 Inches 9 DS-D Light Deterioration Pipe 3 MJ-G Rolled Gasket 5 DS-E Medium Deterioration Pipe 5 Root Intrusion (R) DS-F Heavy Deterioration Pipe 9 R-A Light 3 DS-EG Egg Shaped Pipe 7 R-B Medium 5 DS-G Camera ¼ Under 3 R-C Heavy 7 DS-H Camera ¼ Out 3 Radial Crack (RC) DS-I Camera ½ Under 5 RC-A Radial Crack 1-2 Inches 3 DS-J Camera ½ Out 5 RC-B Radial Crack 3-5 Inches 7 DS-K Camera Under 7 RC-C Radial Crack >5 Inches 9 DS-L Camera Out 7 Inflow/Infiltration (I) E-1 Bozeman Storm Water Facilities Plan E-2 Table E.2-1 Existing City Standard Defect Codes and Point Values in Maintenance Software Co d e De f e c t Po i n t s Co d e De f e c t Po i n t s DS-MB Bottom Missing 9 I-A Through Joint 7 DS-SM Side Wall Missing 9 I-B Through Tap 7 The City is considering investing in a maintenance management system with a scoring system to assess system condition. One example software uses structural, root and infiltration and inflow (I/I) scores to develop an overall score. I/I is used as part of the overall score even in the storm drain system because I/I can take up system pipe capacity needed during major storm events. The scores are calculated using the following formulae: [][] MainLength MainLengthDSSumLSumBJSumMJSumLCSumRCSumScoreStructural*)(4)()()()()(300+++++= [] MainLength ISumIScoreI)(300&= [] MainLength RSumRootScore)(300= )136( )(1)&(3)(6 ++ ++=RootScoreIScoreIScoreStructuralreOverallSco The City might consider adding the categories and point values shown in Table E.2-2 to their system to have a more complete assessment of the existing pipe condition. These values would be added to the structural score equation listed above. Appendix E: Infrastructure Rating System Alternatives Table E.2-2 Potential Additional Defect Codes and Point Values Co d e De f e c t Po i n t s Co d e De f e c t Po i n t s Mineral Deposits (MD) Corrosion (C) MD-A Mineral Deposits (Light) 1 C-A Corrosion (Light) 1 MD-B Mineral Deposits (Medium) 3 C-B Corrosion (Medium) 3 MD-C Mineral Deposits (Heavy) 5 C-C Corrosion (Heavy) 5 Debris (D) D-A Debris (Light) 1 D-B Debris (Medium) 3 D-C Debris (Heavy) 5 It is recommended that the City develop a system condition map with three categories of facility condition: • Satisfactory • Repair • Replace As closed circuit television inspections are completed, the system map should be updated in GIS. Pipes could be classified the based on overall condition score. This approach would take advantage of the scoring system in the maintenance software. For example, pipes with a small number of defects, say 0 - 5, could be considered “Satisfactory,” pipes with an overall score of 5 - 15 could be classified as “Repair,” and pipes with a score of 16 or more could be scheduled for replacement. E.3 Alternative Condition Rating System Another way to classify storm water pipe condition would be to use a decision tree method. An example of a decision tree is shown in Table E.3-1, using the same defect categories as Table E.2-1. This approach allows the City to more appropriately classify storm drains by applying critical criteria to determine what type of action is needed. Using the decision tree method, there are six classifications for pipe condition: • Satisfactory • Point Repair • Rehab • Evaluate for Rehab or Replace • Point Repair and Rehab • Replace E-3 Bozeman Storm Water Facilities Plan E-4 Defect types would be classified as shown in Table E.3-1 to use in the decision tree. Table E.3-1 Decision Tree Defect Types for Improved Condition Rating System Co d e De f e c t Ty p e * Co d e De f e c t Ty p e * Broken Joint Longitudinal Crack BJ-A Broken Joint (Light) -- LC-D Long Crack – 1-2 Inches -- BJ-B Broken Joint (Medium) P,M LC-E Long Crack – 3-5 Inches -- BJ-C Broken Joint (Heavy) P,M,BK LC-F Long Crack – >5 Inches -- Structural Deterioration Misaligned Joint DS-A Broken Pipe Light -- MJ-D Wide Joint 1-2 Inches -- DS-B Broken Pipe Medium P, M MJ-E Wide Joint 3-5 Inches -- DS-C Broken Pipe Heavy P,M,BK MJ-F Wide Joint >5 Inches P, BK DS-D Light Deterioration Pipe -- MJ-G Rolled Gasket -- DS-E Medium Deterioration Pipe P Root Intrusion DS-F Heavy Deterioration Pipe P,M, R-A Light -- DS-EG Egg Shaped Pipe P,M R-B Medium -- DS-G Camera ¼ Under -- R-C Heavy M DS-H Camera ¼ Out -- Radial Crack DS-I Camera ½ Under B RC-A Radial Crack 1-2 Inches -- DS-J Camera ½ Out B RC-B Radial Crack 3-5 Inches -- DS-K Camera Under B RC-C Radial Crack >5 Inches -- DS-L Camera Out B Inflow/Infiltration DS-MB Bottom Missing M,P I-A Through Joint -- DS-SM Side Wall Missing M,P I-B Through Tap -- * NOTE: P=Point; M=Major; B=Bend, BK=Break Additional database development is needed to match the existing data in the inspection log to the data stored in the base pipe and manhole table. Prioritization and costs of projects arising from the above-described condition rating system are discussed in Chapter 6 (Recommended Plan). Bozeman Storm Water Facilities Plan Appendix F: NPDES Materials Model Illicit Discharge and ConnectionStormwater Ordinance ORDINANCE NO. ______ SECTION 1. PURPOSE/INTENT. The purpose of this ordinance is to provide for the health, safety, and general welfare of the citizens of ( ) through the regulation of non-storm water discharges to the storm drainage system to the maximum extent practicable as required by federal and state law. This ordinance establishes methods for controlling the introduction of pollutants into the municipal separate storm sewer system (MS4) in order to comply with requirements of the National Pollutant Discharge Elimination System (NPDES) permit process. The objectives of this ordinance are: (1) To regulate the contribution of pollutants to the municipal separate storm sewer system (MS4) by stormwater discharges by any user (2) To prohibit Illicit Connections and Discharges to the municipal separate storm sewer system (3) To establish legal authority to carry out all inspection, surveillance and monitoring procedures necessary to ensure compliance with this ordinance SECTION 2. DEFINITIONS. For the purposes of this ordinance, the following shall mean: Authorized Enforcement Agency: employees or designees of the director of the municipal agency designated to enforce this ordinance. Best Management Practices (BMPs): schedules of activities, prohibitions of practices, general good house keeping practices, pollution prevention and educational practices, maintenance procedures, and other management practices to prevent or reduce the discharge of pollutants directly or indirectly to stormwater, receiving waters, or stormwater conveyance systems. BMPs also include treatment practices, operating procedures, and practices to control site runoff, spillage or leaks, sludge or water disposal, or drainage from raw materials storage. Clean Water Act. The federal Water Pollution Control Act (33 U.S.C. § 1251 et seq.), and any subsequent amendments thereto. Construction Activity. Activities subject to NPDES Construction Permits. Currently these include construction projects resulting in land disturbance of 5 acres or more. Beginning in March 2003, NPDES Storm Water Phase II permits will be required for construction projects resulting in land disturbance of 1 acre or more. Such activities include but are not limited to clearing and grubbing, grading, excavating, and demolition. Hazardous Materials. Any material, including any substance, waste, or combination thereof, which because of its quantity, concentration, or physical, chemical, or infectious characteristics may cause, or significantly contribute to, a substantial present or potential hazard to human health, safety, property, or the environment when improperly treated, stored, transported, disposed of, or otherwise managed. Illegal Discharge. Any direct or indirect non-storm water discharge to the storm drain system, except as exempted in Section X of this ordinance. Illicit Connections. An illicit connection is defined as either of the following: Any drain or conveyance, whether on the surface or subsurface, which allows an illegal discharge to enter the storm drain system including but not limited to any conveyances which allow any non- storm water discharge including sewage, process wastewater, and wash water to enter the storm drain system and any connections to the storm drain system from indoor drains and sinks, regardless of whether said drain or connection had been previously allowed, permitted, or approved by an authorized enforcement agency or, Any drain or conveyance connected from a commercial or industrial land use to the storm drain system which has not been documented in plans, maps, or equivalent records and approved by an authorized enforcement agency. Industrial Activity. Activities subject to NPDES Industrial Permits as defined in 40 CFR, Section 122.26 (b)(14). National Pollutant Discharge Elimination System (NPDES) Storm Water Discharge Permit. means a permit issued by EPA (or by a State under authority delegated pursuant to 33 USC § 1342(b)) that authorizes the discharge of pollutants to waters of the United States, whether the permit is applicable on an individual, group, or general area-wide basis. Non-Storm Water Discharge. Any discharge to the storm drain system that is not composed entirely of storm water. Person. means any individual, association, organization, partnership, firm, corporation or other entity recognized by law and acting as either the owner or as the owner's agent. Pollutant. Anything which causes or contributes to pollution. Pollutants may include, but are not limited to: paints, varnishes, and solvents; oil and other automotive fluids; non-hazardous liquid and solid wastes and yard wastes; refuse, rubbish, garbage, litter, or other discarded or abandoned objects, ordinances, and accumulations, so that same may cause or contribute to pollution; floatables; pesticides, herbicides, and fertilizers; hazardous substances and wastes; sewage, fecal coliform and pathogens; dissolved and particulate metals; animal wastes; wastes and residues that result from constructing a building or structure; and noxious or offensive matter of any kind. Premises. Any building, lot, parcel of land, or portion of land whether improved or unimproved including adjacent sidewalks and parking strips. Storm Drainage System. Publicly-owned facilities by which storm water is collected and/or conveyed, including but not limited to any roads with drainage systems, municipal streets, gutters, curbs, inlets, piped storm drains, pumping facilities, retention and detention basins, natural and human-made or altered drainage channels, reservoirs, and other drainage structures. Storm Water. Any surface flow, runoff, and drainage consisting entirely of water from any form of natural precipitation, and resulting from such precipitation. Stormwater Pollution Prevention Plan. A document which describes the Best Management Practices and activities to be implemented by a person or business to identify sources of pollution or contamination at a site and the actions to eliminate or reduce pollutant discharges to Stormwater, Stormwater Conveyance Systems, and/or Receiving Waters to the Maximum Extent Practicable. Wastewater means any water or other liquid, other than uncontaminated storm water, discharged from a facility. SECTION 3. APPLICABILITY. This ordinance shall apply to all water entering the storm drain system generated on any developed and undeveloped lands unless explicitly exempted by an authorized enforcement agency. SECTION4. RESPONSIBILITY FOR ADMINISTRATION. The [authorized enforcement agency] shall administer, implement, and enforce the provisions of this ordinance. Any powers granted or duties imposed upon the authorized enforcement agency may be delegated in writing by the Director of the authorized enforcement agency to persons or entities acting in the beneficial interest of or in the employ of the agency. SECTION 5. SEVERABILITY. The provisions of this ordinance are hereby declared to be severable. If any provision, clause, sentence, or paragraph of this Ordinance or the application thereof to any person, establishment, or circumstances shall be held invalid, such invalidity shall not affect the other provisions or application of this Ordinance. SECTION 6. ULTIMATE RESPONSIBILITY. The standards set forth herein and promulgated pursuant to this ordinance are minimum standards; therefore this ordinance does not intend nor imply that compliance by any person will ensure that there will be no contamination, pollution, nor unauthorized discharge of pollutants. SECTION 7. DISCHARGE PROHIBITIONS. Prohibition of Illegal Discharges. No person shall discharge or cause to be discharged into the municipal storm drain system or watercourses any materials, including but not limited to pollutants or waters containing any pollutants that cause or contribute to a violation of applicable water quality standards, other than storm water. The commencement, conduct or continuance of any illegal discharge to the storm drain system is prohibited except as described as follows: (a) The following discharges are exempt from discharge prohibitions established by this ordinance: water line flushing or other potable water sources, landscape irrigation or lawn watering, diverted stream flows, rising ground water, ground water infiltration to storm drains, uncontaminated pumped ground water, foundation or footing drains (not including active groundwater dewatering systems), crawl space pumps, air conditioning condensation, springs, non-commercial washing of vehicles, natural riparian habitat or wet-land flows, swimming pools (if dechlorinated - typically less than one PPM chlorine), fire fighting activities, and any other water source not containing Pollutants. (b) Discharges specified in writing by the authorized enforcement agency as being necessary to protect public health and safety. (c) Dye testing is an allowable discharge, but requires a verbal notification to the authorized enforcement agency prior to the time of the test. (d) The prohibition shall not apply to any non-storm water discharge permitted under an NPDES permit, waiver, or waste discharge order issued to the discharger and administered under the authority of the Federal Environmental Protection Agency, provided that the discharger is in full compliance with all requirements of the permit, waiver, or order and other applicable laws and regulations, and provided that written approval has been granted for any discharge to the storm drain system. Prohibition of Illicit Connections. (a) The construction, use, maintenance or continued existence of illicit connections to the storm drain system is prohibited. (b) This prohibition expressly includes, without limitation, illicit connections made in the past, regardless of whether the connection was permissible under law or practices applicable or prevailing at the time of connection. (c) A person is considered to be in violation of this ordinance if the person connects a line conveying sewage to the MS4, or allows such a connection to continue. SECTION 8. SUSPENSION OF MS4 ACCESS. Suspension due to Illicit Discharges in Emergency Situations The [authorized enforcement agency] may, without prior notice, suspend MS4 discharge access to a person when such suspension is necessary to stop an actual or threatened discharge which presents or may present imminent and substantial danger to the environment, or to the health or welfare of persons, or to the MS4 or Waters of the United States. If the violator fails to comply with a suspension order issued in an emergency, the authorized enforcement agency may take such steps as deemed necessary to prevent or minimize damage to the MS4 or Waters of the United States, or to minimize danger to persons. Suspension due to the Detection of Illicit Discharge Any person discharging to the MS4 in violation of this ordinance may have their MS4 access terminated if such termination would abate or reduce an illicit discharge. The authorized enforcement agency will notify a violator of the proposed termination of its MS4 access. The violator may petition the authorized enforcement agency for a reconsideration and hearing. A person commits an offense if the person reinstates MS4 access to premises terminated pursuant to this Section, without the prior approval of the authorized enforcement agency. SECTION 9. INDUSTRIAL OR CONSTRUCTION ACTIVITY DISCHARGES. Any person subject to an industrial or construction activity NPDES storm water discharge permit shall comply with all provisions of such permit. Proof of compliance with said permit may be required in a form acceptable to the [authorized enforcement agency] prior to the allowing of discharges to the MS4. SECTION 10. MONITORING OF DISCHARGES. A. Applicability. This section applies to all facilities that have storm water discharges associated with industrial activity, including construction activity. B. Access to Facilities. (a) The [authorized enforcement agency] shall be permitted to enter and inspect facilities subject to regulation under this ordinance as often as may be necessary to determine compliance with this ordinance. If a discharger has security measures in force which require proper identification and clearance before entry into its premises, the discharger shall make the necessary arrangements to allow access to representatives of the authorized enforcement agency. (b) Facility operators shall allow the [authorized enforcement agency] ready access to all parts of the premises for the purposes of inspection, sampling, examination and copying of records that must be kept under the conditions of an NPDES permit to discharge storm water, and the performance of any additional duties as defined by state and federal law. (c) The [authorized enforcement agency] shall have the right to set up on any permitted facility such devices as are necessary in the opinion of the authorized enforcement agency to conduct monitoring and/or sampling of the facility's storm water discharge. (d) The [authorized enforcement agency] has the right to require the discharger to install monitoring equipment as necessary. The facility's sampling and monitoring equipment shall be maintained at all times in a safe and proper operating condition by the discharger at its own expense. All devices used to measure stormwater flow and quality shall be calibrated to ensure their accuracy. (e) Any temporary or permanent obstruction to safe and easy access to the facility to be inspected and/or sampled shall be promptly removed by the operator at the written or oral request of the [authorized enforcement agency] and shall not be replaced. The costs of clearing such access shall be borne by the operator. (f) Unreasonable delays in allowing the [authorized enforcement agency] access to a permitted facility is a violation of a storm water discharge permit and of this ordinance. A person who is the operator of a facility with a NPDES permit to discharge storm water associated with industrial activity commits an offense if the person denies the authorized enforcement agency reasonable access to the permitted facility for the purpose of conducting any activity authorized or required by this ordinance. (g) If the [authorized enforcement agency] has been refused access to any part of the premises from which stormwater is discharged, and he/she is able to demonstrate probable cause to believe that there may be a violation of this ordinance, or that there is a need to inspect and/or sample as part of a routine inspection and sampling program designed to verify compliance with this ordinance or any order issued hereunder, or to protect the overall public health, safety, and welfare of the community, then the authorized enforcement agency may seek issuance of a search warrant from any court of competent jurisdiction. SECTION 11. REQUIREMENT TO PREVENT, CONTROL, AND REDUCE STORM WATER POLLUTANTS BY THE USE OF BEST MANAGEMENT PRACTICES. [Authorized enforcement agency] will adopt requirements identifying Best Management Practices for any activity, operation, or facility which may cause or contribute to pollution or contamination of storm water, the storm drain system, or waters of the U.S. The owner or operator of a commercial or industrial establishment shall provide, at their own expense, reasonable protection from accidental discharge of prohibited materials or other wastes into the municipal storm drain system or watercourses through the use of these structural and non-structural BMPs. Further, any person responsible for a property or premise, which is, or may be, the source of an illicit discharge, may be required to implement, at said person's expense, additional structural and non-structural BMPs to prevent the further discharge of pollutants to the municipal separate storm sewer system. Compliance with all terms and conditions of a valid NPDES permit authorizing the discharge of storm water associated with industrial activity, to the extent practicable, shall be deemed compliance with the provisions of this section. These BMPs shall be part of a stormwater pollution prevention plan (SWPP) as necessary for compliance with requirements of the NPDES permit. SECTION12. WATERCOURSE PROTECTION. Every person owning property through which a watercourse passes, or such person's lessee, shall keep and maintain that part of the watercourse within the property free of trash, debris, excessive vegetation, and other obstacles that would pollute, contaminate, or significantly retard the flow of water through the watercourse. In addition, the owner or lessee shall maintain existing privately owned structures within or adjacent to a watercourse, so that such structures will not become a hazard to the use, function, or physical integrity of the watercourse. SECTION 13. NOTIFICATION OF SPILLS. Notwithstanding other requirements of law, as soon as any person responsible for a facility or operation, or responsible for emergency response for a facility or operation has information of any known or suspected release of materials which are resulting or may result in illegal discharges or pollutants discharging into storm water, the storm drain system, or water of the U.S. said person shall take all necessary steps to ensure the discovery, containment, and cleanup of such release. In the event of such a release of hazardous materials said person shall immediately notify emergency response agencies of the occurrence via emergency dispatch services. In the event of a release of non-hazardous materials, said person shall notify the authorized enforcement agency in person or by phone or facsimile no later than the next business day. Notifications in person or by phone shall be confirmed by written notice addressed and mailed to the [authorized enforcement agency] within three business days of the phone notice. If the discharge of prohibited materials emanates from a commercial or industrial establishment, the owner or operator of such establishment shall also retain an on-site written record of the discharge and the actions taken to prevent its recurrence. Such records shall be retained for at least three years. SECTION 14. ENFORCEMENT. A. Notice of Violation. Whenever the [authorized enforcement agency] finds that a person has violated a prohibition or failed to meet a requirement of this Ordinance, the authorized enforcement agency may order compliance by written notice of violation to the responsible person. Such notice may require without limitation: (a) The performance of monitoring, analyses, and reporting; (b) The elimination of illicit connections or discharges; (c) That violating discharges, practices, or operations shall cease and desist; (d) The abatement or remediation of storm water pollution or contamination hazards and the restoration of any affected property; and (e) Payment of a fine to cover administrative and remediation costs; and (f) The implementation of source control or treatment BMPs. If abatement of a violation and/or restoration of affected property is required, the notice shall set forth a deadline within which such remediation or restoration must be completed. Said notice shall further advise that, should the violator fail to remediate or restore within the established deadline, the work will be done by a designated governmental agency or a contractor and the expense thereof shall be charged to the violator. SECTION 15. APPEAL OF NOTICE OF VIOLATION. Any person receiving a Notice of Violation may appeal the determination of the authorized enforcement agency. The notice of appeal must be received within days from the date of the Notice of Violation. Hearing on the appeal before the appropriate authority or his/her designee shall take place within 15 days from the date of receipt of the notice of appeal. The decision of the municipal authority or their designee shall be final. SECTION 16. ENFORCEMENT MEASURES AFTER APPEAL. If the violation has not been corrected pursuant to the requirements set forth in the Notice of Violation, or , in the event of an appeal, within days of the decision of the municipal authority upholding the decision of the authorized enforcement agency, then representatives of the authorized enforcement agency shall enter upon the subject private property and are authorized to take any and all measures necessary to abate the violation and/or restore the property. It shall be unlawful for any person, owner, agent or person in possession of any premises to refuse to allow the government agency or designated contractor to enter upon the premises for the purposes set forth above. SECTION 17. COST OF ABATEMENT OF THE VIOLATION. Within days after abatement of the violation, the owner of the property will be notified of the cost of abatement, including administrative costs. The property owner may file a written protest objecting to the amount of the assessment within days. If the amount due is not paid within a timely manner as determined by the decision of the municipal authority or by the expiration of the time in which to file an appeal, the charges shall become a special assessment against the property and shall constitute a lien on the property for the amount of the assessment. Any person violating any of the provisions of this article shall become liable to the city by reason of such violation. The liability shall be paid in not more than 12 equal payments. Interest at the rate of percent per annum shall be assessed on the balance beginning on the st day following discovery of the violation. SECTION 18. INJUNCTIVE RELIEF. It shall be unlawful for any person to violate any provision or fail to comply with any of the requirements of this Ordinance. If a person has violated or continues to violate the provisions of this ordinance, the authorized enforcement agency may petition for a preliminary or permanent injunction restraining the person from activities which would create further violations or compelling the person to perform abatement or remediation of the violation. SECTION 19. COMPENSATORY ACTION. In lieu of enforcement proceedings, penalties, and remedies authorized by this Ordinance, the authorized enforcement agency may impose upon a violator alternative compensatory actions, such as storm drain stenciling, attendance at compliance workshops, creek cleanup, etc. SECTION 20. VIOLATIONS DEEMED A PUBLIC NUISANCE. In addition to the enforcement processes and penalties provided, any condition caused or permitted to exist in violation of any of the provisions of this Ordinance is a threat to public health, safety, and welfare, and is declared and deemed a nuisance, and may be summarily abated or restored at the violator's expense, and/or a civil action to abate, enjoin, or otherwise compel the cessation of such nuisance may be taken. SECTION 21. CRIMINAL PROSECUTION. Any person that has violated or continues to violate this ordinance shall be liable to criminal prosecution to the fullest extent of the law, and shall be subject to a criminal penalty of ______ dollars per violation per day and/or imprisonment for a period of time not to exceed ____ days. The authorized enforcement agency may recover all attorney’s fees court costs and other expenses associated with enforcement of this ordinance, including sampling and monitoring expenses. SECTION 22. REMEDIES NOT EXCLUSIVE. The remedies listed in this ordinance are not exclusive of any other remedies available under any applicable federal, state or local law and it is within the discretion of the authorized enforcement agency to seek cumulative remedies. SECTION 23. ADOPTION OF ORDINANCE. This ordinance shall be in full force and effect __ days after its final passage and adoption. All prior ordinances and parts of ordinances in conflict with this ordinance are hereby repealed. PASSED AND ADOPTED this ____ day of ___________, 19__, by the following vote: Municipality/Organization: EPA NPDES Permit Number: MaDEP Transmittal Number: W- Annual Report Number & Reporting Period: NPDES PII Small MS4 General Permit Annual Report Part I. General Information Contact Person: Title: Telephone #: Email: Certification: I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. Signature: Printed Name: Title: Date: 2 Pa r t I I . S e l f - A s s e s s m e n t 3 Pa r t I I I . S u m m a r y o f M i n i m u m C o n t r o l M e a s u r e s 1. P u b l i c E d u c a t i o n a n d O u t r e a c h BM P ID # BM P D e s c r i p t i o n Re s p o n s i b l e De p t . / P e r s o n Na m e Me a s u r a b l e G o a l ( s ) Pr o g r e s s o n G o a l ( s ) – Pe r m i t Y e a r 1 (R e l i a n c e o n n o n - m u n i c i p a l p a r t n e r s in d i c a t e d , i f a n y ) Pl a n n e d A c t i v i t i e s – Pe r m i t Y e a r 2 Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d 1a . A d d i t i o n s 4 2. P u b l i c I n v o l v e m e n t a n d P a r t i c i p a t i o n BM P ID # BM P D e s c r i p t i o n Re s p o n s i b l e De p t . / P e r s o n Na m e Me a s u r a b l e G o a l ( s ) Pr o g r e s s o n G o a l ( s ) – Pe r m i t Y e a r 1 (R e l i a n c e o n n o n - m u n i c i p a l p a r t n e r s in d i c a t e d , i f a n y ) Pl a n n e d A c t i v i t i e s – Pe r m i t Y e a r 2 Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d 2a . A d d i t i o n s 5 3. I l l i c i t D i s c h a r g e D e t e c t i o n a n d E l i m i n a t i o n BM P ID # BM P D e s c r i p t i o n Re s p o n s i b l e De p t . / P e r s o n Na m e Me a s u r a b l e G o a l ( s ) Pr o g r e s s o n G o a l ( s ) – Pe r m i t Y e a r 1 (R e l i a n c e o n n o n - m u n i c i p a l p a r t n e r s in d i c a t e d , i f a n y ) Pl a n n e d A c t i v i t i e s – Pe r m i t Y e a r 2 Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d 3a . A d d i t i o n s 6 4. C o n s t r u c t i o n S i t e S t o r m w a t e r R u n o f f C o n t r o l BM P ID # BM P D e s c r i p t i o n Re s p o n s i b l e De p t . / P e r s o n Na m e Me a s u r a b l e G o a l ( s ) Pr o g r e s s o n G o a l ( s ) – Pe r m i t Y e a r 1 (R e l i a n c e o n n o n - m u n i c i p a l p a r t n e r s in d i c a t e d , i f a n y ) Pl a n n e d A c t i v i t i e s – Pe r m i t Y e a r 2 Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d 4a . A d d i t i o n s 7 5. P o s t - C o n s t r u c t i o n S t o r m w a t e r M a n a g e m e n t i n N e w D e v e l o p m e n t a n d R e d e v e l o p m e n t BM P ID # BM P D e s c r i p t i o n Re s p o n s i b l e De p t . / P e r s o n Na m e Me a s u r a b l e G o a l ( s ) Pr o g r e s s o n G o a l ( s ) – Pe r m i t Y e a r 1 (R e l i a n c e o n n o n - m u n i c i p a l p a r t n e r s in d i c a t e d , i f a n y ) Pl a n n e d A c t i v i t i e s – Pe r m i t Y e a r 2 Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d 5a . A d d i t i o n s 8 6. P o l l u t i o n P r e v e n t i o n a n d G o o d Ho u s e k e e p i n g i n M u n i c i p a l O p e r a t i o n s BM P ID # BM P D e s c r i p t i o n Re s p o n s i b l e De p t . / P e r s o n Na m e Me a s u r a b l e G o a l ( s ) Pr o g r e s s o n G o a l ( s ) – Pe r m i t Y e a r 1 (R e l i a n c e o n n o n - m u n i c i p a l p a r t n e r s in d i c a t e d , i f a n y ) Pl a n n e d A c t i v i t i e s – Pe r m i t Y e a r 2 Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d 6a . A d d i t i o n s 9 7. B M P s f o r M e e t i n g T o t a l M a x i m u m D a i l y L oa d ( T M D L ) W a s t e L o a d A l l o c a t i o n s ( W L A ) << i f a p p l i c a b l e > > BM P ID # BM P D e s c r i p t i o n Re s p o n s i b l e De p t . / P e r s o n Na m e Me a s u r a b l e G o a l ( s ) Pr o g r e s s o n G o a l ( s ) – Pe r m i t Y e a r 1 (R e l i a n c e o n n o n - m u n i c i p a l p a r t n e r s in d i c a t e d , i f a n y ) Pl a n n e d A c t i v i t i e s – Pe r m i t Y e a r 2 Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d Re v i s e d 7a . A d d i t i o n s 7b . W L A A s s e s s m e n t 10 Pa r t I V . S u m m a r y o f I n f o r m a t i o n C o l l e c t e d a n d A n a l y z e d Pa r t V . P r o g r a m O u t p u t s & A c c o m p l i s h m e n t s ( O P T I O N A L ) Pr o g r a m m a t i c St o r m w a t e r m a n a g e m e n t p o s i t i o n c r e a t e d / s t a f f e d (y / n ) An n u a l p r o g r a m b u d g e t / e x p e n d i t u r e s ($ ) Ed u c a t i o n , I n v o l v e m e n t , a n d T r a i n i n g Es t i m a t e d n u m b e r o f r e s i d e n t s r e a c h e d b y e d u c a t i o n p r o g r a m ( s ) (# o r % ) St o r m w a t e r m a n a g e m e n t c o m m i t t e e e s t a b l i s h e d (y / n ) St r e a m t e a m s e s t a b l i s h e d o r s u p p o r t e d (# o r y / n ) Sh o r e l i n e c l e a n - u p p a r t i c i p a t i o n o r q u a n t i t y o f s h o r e l i n e m i l e s c l e a n e d (y / n o r m i . ) Ho u s e h o l d H a z a r d o u s W a s t e C o l l e c t i o n D a y s da y s s p o n s o r e d (# ) co m m u n i t y p a r t i c i p a t i o n (% ) ma t e r i a l c o l l e c t e d (t o n s o r g a l ) Sc h o o l c u r r i c u l a i m p l e m e n t e d (y / n ) 11 Legal/Re g u l a t o r y In P l a c e Pr i o r t o U n d e r Ph a s e I I R e v i e w D r a f t e d A d o p t e d Re g u l a t o r y M e c h a n i s m S t a t u s ( i n d i c a t e w i t h “ X”) Il l i c i t D i s c h a r g e D e t e c t i o n & E l i m i n a t i o n Er o s i o n & S e d i m e n t C o n t r o l Po s t - D e v e l o p m e n t St o r m w a t e r Ma n a g e m e n t Ac c o m p a n y i n g R e g u l a t i o n S t a t u s ( i n d i c a t e w i t h “ X”) Il l i c i t D i s c h a r g e D e t e c t i o n & E l i m i n a t i o n Er o s i o n & S e d i m e n t C o n t r o l Po s t - D e v e l o p m e n t St o r m w a t e r Ma n a g e m e n t Ma p p i n g a n d I l l i c i t D i s c h a r g e s Ou t f a l l m a p p i n g c o m p l e t e (% ) Es t i m a t e d o r a c t u a l n u m b e r o f o u t f a l l s (# ) Sy s t e m - W i d e m a p p i n g c o m p l e t e (% ) Ma p p i n g m e t h o d ( s ) Pa p e r / M y l a r (% ) CA D D (% ) GI S (% ) Ou t f a l l s i n s p e c t e d / s c r e e n e d (# o r % ) Il l i c i t d i s c h a r g e s i d e n t i f i e d (# ) Il l i c i t c o n n e c t i o n s r e m o v e d (# ) (e s t . g p d ) % o f p o p u l a t i o n o n s e w e r (% ) % o f p o p u l a t i o n o n s e p t i c s y s t e m s (% ) 12 Co n s t r u c t i o n Nu m b e r o f c o n s t r u c t i o n s t a r t s ( > 1 - a c r e ) (# ) Es t i m a t e d p e r c e n t a g e o f c o n s t r u c t i o n s t a r t s a d e q u a t e l y r e g u l a t e d f o r e r o s i o n a n d s e d i m e n t c o n t r o l (% ) Si t e i n s p e c t i o n s c o m p l e t e d (# o r % ) Ti c k e t s / S t o p w o r k o r d e r s i s s u e d (# o r % ) Fi n e s c o l l e c t e d (# a n d $ ) Co m p l a i n t s / c o n c e r n s r e c e i v e d f r o m p u b l i c (# ) Po s t - D e v e l o p m e n t S t o r m w a t e r M a n a g e m e n t Es t i m a t e d p e r c e n t a g e o f d e v e l o p m e n t / r e d e v e l o p m e n t p r o j e c t s a d e q u a t e l y r e g u l a t e d f o r p o s t - co n s t r u c t i o n s t o r m w a t e r c o n t r o l (% ) Si t e i n s p e c t i o n s c o m p l e t e d (# o r % ) Es t i m a t e d v o l u m e o f s t o r m w a t e r r e c h a r g e d (g p y ) Op e r a t i o n s a n d M a i n t e n a n c e Av e r a g e f r e q u e n c y o f c a t c h b a s i n c l e a n i n g ( n o n - co m m e r c i a l / n o n - a r t e r i a l s t r e e t s ) (t i m e s / y r ) Av e r a g e f r e q u e n c y o f c a t c h b a s i n c l e a n i n g ( c o m m e r c i a l / a r t e r i a l o r o t h e r c r i t i c a l s t r e e t s ) (t i m e s / y r ) To t a l n u m b e r o f s t r u c t u r e s c l e a n e d (# ) St o r m d r a i n c l e a n e d (L F o r m i . ) Qt y . o f s c r e e n i n g s / d e b r i s r e m o v e d f r o m s t or m s e w e r i n f r a s t r u c t u r e (l b s . o r t o n s ) Di s p o s a l o r u s e o f s w e e p i n g s ( l a n d f i l l , P O T W , c o m po s t , r e c y c l e f o r s a n d , b e n e f i c i a l u s e , e t c . ) Co s t o f s c r e e n i n g s d i s p o s a l ($ ) Av e r a g e f r e q u e n c y o f s t r e e t s w e e p i n g ( n o n - c o mm e r c i a l / n o n - a r t e r i a l s t r e e t s ) (t i m e s / y r ) Av e r a g e f r e q u e n c y o f s t r e e t s w e e p i n g ( c o m m e r c i a l / a r t e r i a l o r o t h e r c r i t i c a l s t r e e t s ) (t i m e s / y r ) 13 Qt y . o f s a n d / d e b r i s c o l l e c t e d b y s w e e p i n g (l b s . o r t o n s ) Di s p o s a l o f s w e e p i n g s ( l a n d f i l l , P O T W , c o m p o s t , b e n e f i c i a l u s e , e t c . ) (l o c a t i o n ) Co s t o f s w e e p i n g s d i s p o s a l ($ ) Va c u u m s t r e e t s w e e p e r s p u r c h a s e d / l e a s e d (# ) Va c u u m s t r e e t s w e e p e r s s p e c i f i e d i n c o n t r a c t s (y / n ) Re d u c t i o n i n a p p l i c a t i o n o n p u b l i c l a n d o f : ( “ N / A ” = n e v e r u s e d ; “ 1 0 0 % ” = e l i m i n a t i o n ) Fe r t i l i z e r s (l b s . o r % ) He r b i c i d e s (l b s . o r % ) Pe s t i c i d e s (l b s . o r % ) An t i - / D e - I c i n g p r o d u c t s a n d r a t i o s % N a C l % C a C l 2 % M g C l 2 % C M A % K a c % K C l % S a n d Pr e - w e t t i n g t e c h n i q u e s u t i l i z e d (y / n ) Ma n u a l c o n t r o l s p r e a d e r s u s e d (y / n ) Au t o m a t i c o r Z e r o - v e l o c i t y s p r e a d e r s u s e d (y / n ) Es t i m a t e d n e t r e d u c t i o n i n t y p i c a l y e a r s a l t a p p l i c a t i o n (l b s . o r % ) Sa l t p i l e ( s ) c o v e r e d i n s t o r a g e s h e d ( s ) (y / n ) St o r a g e s h e d ( s ) i n d e s i g n o r u n d e r c o n s t r u c t i o n (y / n ) Bozeman Storm Water Facilities Plan Appendix G: Storm Water Design Report - Submittal Guidelines Appendix G – Storm Water Design Report – Submittal Guidelines Computer-generated reports and calculation summaries shall be attached behind a summary report generally following the organizational format presented below. All applicable and required information (identified below and/or in the current Design Standards and Specifications Policy) shall be submitted. Report text and summary shall precede software printout data. G.1 Input Summary - Flow Routing: Describe, for historic (pre-development) and developed (post- development) conditions, how runoff is routed through or around the project. - Hydrologic Soil Group: Identify distribution of hydrologic group A, B, C and D soils within the study area, in the text or on an attached NRCS soil survey map showing all drainage basins used in the calculations. - Runoff Coefficients: List the value and description of all runoff coefficients that were used to calculate the composite (sub-basin) coefficients used in the pre- and post-development runoff calculations. Runoff coefficients shall be determined based on the standard City coefficient tables. The description should include hydrologic soil group, and ground surface/vegetation type and condition. - Time of Concentration: Describe calculation method used, list input parameters (e.g., roughness coefficients), and include applicable tables and graphs. Assess the effect of irregular distribution of impervious areas on peak runoff rate, and make the necessary adjustments so the runoff calculations do not underestimate overall peak runoff from the site. For example, a drainage sub-basin that is primarily impervious may generate a higher peak runoff rate than an expanded basin that includes a larger percentage of pervious areas, due to the difference in time of concentration. - Basin Input Summary: For each basin, provide a summary of input values used in the calculations. The text may refer to a computer-generated report for this information. - Constructed Storm Drain Facilities: Describe existing and proposed constructed facilities with respect to dimensions, sizes, elevations and roughness coefficients used in the hydraulic calculations. Include existing and proposed culverts, storm drain pipe, natural swales, constructed ditches, and detention/retention facility structures such as orifices, risers, weirs, manholes, vaults and pipes. Also include stage-storage information for proposed surface and underground detention/retention/infiltration facilities. The written summary description may reference attached topographic maps or computer-generated reports for this information. G-1 Bozeman Storm Water Facilities Plan G-2 G.2 Output Summary - Basin Runoff Summary: For each historic (pre-development) and developed (post- development) basin, provide peak runoff (cfs), time to peak (hrs), and runoff volume (cu. ft. or acre-feet). The text may refer to a computer-generated report for this information. - Detention/Retention Facilities: For each facility, provide a summary of pond routing results for the 10 and 100-year storm events. Results shall include maximum stored volume (cu. ft.), maximum water depth (ft.), and calculated water surface elevation (WSEL). Verify that the 100-year WSEL is a minimum of one foot below the finished floor elevation of proposed and existing buildings. - Hydraulic Conveyance Summary: Describe flow conveyance and routing through and around the project site. Summarize headwater depths and hydraulic grade lines for all culverts and pipes for a 25-year storm event, and compare to overtopping/maximum headwater depth to verify full conveyance of 25-year peak runoff in closed conduits. Provide flow depth and velocity calculations for all open channels. Demonstrate that the 25-year flood limits are below proposed and existing pavement, sidewalks and trails. The written summary description may reference detailed information in an attached computer-generated report. - 100-year Flood Conveyance: Describe flow routing in the 100-year storm. Demonstrate that the 100-year flood limits are a minimum of one foot below the finished floor elevation of proposed and existing buildings. - Overall Change in 10- and 25-year Peak Runoff Rate: State the overall change in peak runoff from historic (pre-development) to developed (post-development) conditions for the 10-year and 25-year storm events. In both cases, the overall post-development peak runoff rate from the site shall not exceed the pre-development rate. G.3 Drainage Maps - Provide historic (pre-development) and developed (post-development) drainage maps. The map for developed conditions shall show general flow routing and finished floor elevations of all buildings. - Drainage maps shall include topography, drainage basin boundaries, flow directions, natural and constructed channels, detention facilities, culverts, and other drainage features. Minimum elevation contour interval shall be one foot where average ground slope is 2 percent or less, and 5 feet for all other areas. Bozeman Storm Water Facilities Plan Appendix I: Storm Drain Map Bozeman Storm Water Facilities Plan Appendix J: Screening Guidance Kalispell Storm Water Management Permit Stormwater Management (SWM) Permit FEE: $10 Less Than an Acre $45 Greater than an Acre Stormwater Management is increasingly important for the purpose of maintaining clean water and preserving waterbodies such as streams, rivers, and lakes. The City of Kalispell’s Stormwater Management Ordinance 1600 went into effect May 2, 2007, as mandated under the Federal Clean Water Act (CWA) and the Montana Pollution Discharge Elimination (MPDES) regulation. These regulations are designed to protect water quality in waterbodies by reducing the amount of pollutants that stormwater collects and carries into storm conveyance systems and then onto streams, rivers, and lakes. City Stormwater Management Permits are required for all land disturbances within the City of Kalispell. This permit is issued and administered by the Public Works Department. The requirements for the permit are established by land disturbance size: (1) LESS than one acre, and (2) GREATER than and equal to one acre. The documents outlining the permit requirements and the permit forms are listed by permit requirement below. The following activities are exempt from the requirement to obtain a City Stormwater Management Permit: 1. Emergencies posing an immediate danger to life or property, or substantial flood or fire hazards. 2. Any activity where the total volume of material disturbed, stored, disposed of or used as fill does not exceed five (5) cubic yards or the area disturbed does not exceed one thousand (1000) square feet provided it does not obstruct a watercourse, and is not located in a floodplain. LESS than an acre GREATER than and equal to an acre 1. SWM Permit Application Form 2. SWM Permit Transfer Form 3. Less Permit Cover Notice 4. Less Checklist 5. Less Map 6. Example Residential SWM Map 1. SWM Permit Application 2. SWM Permit Transfer Form 3. Greater Permit Cover Notice 4. Greater Checklist SWM Permit Application Page 1 of 2 Note: This permit is separate from any permits required by the Montana Department of Environmental Quality. A State Stormwater Construction Permit is required for all land disturbance activities equal to or greater than one (1) acre or for land disturbance activities less than one (1) acre that are part of a larger common plan of development or sale that would disturb one (1) acre or more. **No land disturbance is permitted on any project site without an approved City of Kalispell Stormwater Management Permit** (1) Contact Information: (a) Project Owner Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: (b) Contractor Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: (c) Engineer Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: (2) Project Information Project Address : Lot Number: Subdivision (if applicable): Project Size: (Land Disturbance) LESS than one acre $10.00 GREATER or equal to one acre $45.00 (3) Nature of Construction Check the appropriate box(es) or provide a brief description that indicates the general nature of the construction activities. Single Family Residential Multi-Family Residential Utility Commercial/Industrial Highway / Road Other (describe): Description of proposed work: City of Kalispell, Montana Stormwater Management Permit Application Permit Number _________________ Date Submitted_________________ Final Stabilization Date __________ Public Works Department 306 1st Ave East Kalispell, Montana 59901 (406) 758‐7720 SWM Permit Application Page 2 of 2 City of Kalispell, Montana Stormwater Management Permit Application Permit Number ________________ Date Submitted________________ Final Stabilization Date _________ (4) Project Schedule Start Date: Completion Date: Final Stabilization Date: (5) Waterbodies and Storm Conveyance Systems (a) List Waterbodies within 200’ of project Streams: Lakes: Wetlands: Rivers: Sloughs: Other: (b) List Storm Conveyance Systems within 100’ of project Ditches: Swales: Detention Facilities: Storm Drain Inlets: Pipe Inlets/Outlets: Gutter: (6) Acknowledgement Certificate: I certify that I am the Owner or Owner’s authorized agent. If acting as an authorized agent, I further certify that I am authorized to act as the Owners agent regarding the property at the above-referenced address for the purpose of filing applications for decisions, permits or review under the City of Kalispell Ordinance 1600 and have full power and authority to perform on behalf of the Owner all acts required to enable the City to process and review such applications I certify that the information on this application is true and correct and understand that I shall not start this project until this application is approved. I shall comply with the laws of the State of Montana and the ordinances of the City of Kalispell. ______________________________________________________ _______________ Signature of Legally Responsible Person (Submission must include original signature) Date Signed ________________________________________________________________________ _____________________ Name (printed) Title **For Official Use Only** LESS than one acre Received City By Date SMP Checklist Yes NoField Visit SMP Plan Yes NoApproval SMP Map Yes NoComments: Payment-$10.00 Yes No GREATER or equal to one acre Received MT Stormwater Discharge Permit (NOI) Yes No SWPPP Yes No Site Map showing BMPs Yes No MT Stormwater Discharge Permit (NOT) Yes No SMP Checklist Yes No SMP Plan Yes No SMP Map Yes No Payment-$45.00 Yes No New construction subject to impact fees Yes No SWM Permit Transfer Page 1 of 1 Note: This permit is separate from any permits required by the Montana Department of Environmental Quality. A State Stormwater Construction Permit is required for all land disturbance activities equal to or greater than one (1) acre or for land disturbance activities less than one (1) acre that are part of a larger common plan of development or sale that would disturb one (1) acre or more. (1) New Contact Information: (a) Project Owner Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: (b) Contractor Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: (c) Engineer Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: City of Kalispell, Montana Stormwater Management Permit Transfer Permit Number _______________________ Public Works Department 306 1st Ave East Kalispell, Montana 59901 (406) 758‐7720 (3) Acknowledgement Certificate: I certify that I am the Owner or Owner’s authorized agent. If acting as an authorized agent, I further certify that I am authorized to act as the Owners agent regarding the property at the above-referenced address for the purpose of filing applications for decisions, permits or review under the City of Kalispell Ordinance 1600 and have full power and authority to perform on behalf of the Owner all acts required to enable the City to process and review such applications I certify that the information on this application is true and correct and I shall comply with the laws of the State of Montana and the ordinances of the City of Kalispell. ______________________________________________________ _______________ Signature of Legally Responsible Person (Submission must include original signature) Date Signed ________________________________________________________________________ _____________________ Name (printed) Title (2) Project Information Project Size: (Land Disturbance) LESS than one acre GREATER or equal to one acre Stormwater Management Regulations For Land Disturbance Sites LESS Than One Acre Less Permit Cover Notice Page 1 of 2 Stormwater Management is increasingly important for the purpose of maintaining clean water and preserving waterbodies such as streams, rivers, and lakes. The City of Kalispell’s Stormwater Management Ordinance 1600 went into effect May 2, 2007, as mandated under the Federal Clean Water Act (CWA) and the Montana Pollution Discharge Elimination (MPDES) regulation. These regulations are designed to improve water quality in waterbodies by reducing the amount of pollutants that stormwater collects and carries into storm conveyance systems. Permit and Fee Owners/operators of construction sites less than one (1) acre are required to apply for a City of Kalispell Stormwater Management Permit (SMP). The SMP requires submittals of an application form and a Stormwater Management Plan in compliance with the City of Kalispell’s Stormwater Management Ordinance 1600. The Stormwater Management Plan shall contain the following items; 1. A completed Stormwater Management Plan checklist which outlines the project site’s Best Management Practices (BMPs) 2. A short narrative explaining how the permittee(s) will implement BMPs described on the checklist 3. A map of the construction site showing the locations of the BMPs The Stormwater Management Permit application must be submitted to the City of Kalispell Public Works Department a minimum of five days before construction begins. A fee of $10 for sites less than one (1) acre shall be paid at the time the permit application is submitted. Inspection and Review Site plan review and inspection programs aid in compliance and enforcement, and provide an opportunity for guidance and education. The City will perform a site plan review of potential water quality impacts at the time the Stormwater Management Permit is submitted and will conduct regular inspections of the construction site. The permittee(s) will be required to perform site inspections every 14 days and after major storm events to ensure all BMPs have been constructed and are functioning properly. The purpose of such inspections will be to determine the overall effectiveness of the control plan and the possible need for BMPs. All inspections shall be documented in written form, kept on the project site, and made available for review by the City. Violation and Enforcement If any violation is found, a notice will be issued to the Responsible Party. The notice will state the nature of the alleged violation(s), the action required to fix the violation(s), and a time limit to fix the violation(s). The City has the authority to issue a stop work order, clean the public way and bill the owner directly for the actual cost of cleanup plus a $200 administrative fee, and issuing a civil citations. Any person, firm or corporation violating any of the provisions or terms of Ordinance #1600 of the City of Kalispell may be subject to penalties as a municipal infraction City of Kalispell, Montana Public Works Department Stormwater Erosion/Sediment/Pollution Prevention Regulation For Land Disturbance Sites Less Than One Acre Less Permit Cover Notice Page 2 of 2 pursuant of Chapter 1, Article II of the Kalispell City Code. Each day of continued violation shall constitute a separate, additional offence. Permit Transfer When authorization of a Stormwater Management Permit is no longer accurate because the property was sold or there is a position or contact change from the original permit application a new authorization must be submitted to the City Public Works Office. The authorization change must be submitted and signed within 15 calendar days of the change. A copy of the permit transfer document is included in this packet. If you have any questions contact the Public Works Department at 306 1st Ave. E., (Phone) 406- 758-7720. City of Kalispell, Montana Public Works Department LessChecklist 1 Required Best Management Practice (BMPs) Stormwater Management Plan Descriptive Narrative *Show on Map Initial Here 1 Prevent silt, dirt, topsoil, etc. from washing into the streets, alleys, drainage easements, drainage conveyance systems, and storm drains. 2 Implement and maintain erosion control BMPs to prevent the erosion and transport of sediment by water/rain runoff. 3 Include spoil areas and staging areas as part of the project/construction site. X 4 Establish permanent erosion control for all disturbed land areas related to the project activity before final occupancy of structures located thereon. 5 Identify all erosion and sediment control BMPs to be installed and maintained throughout the duration of the project. X 6 Use clearing techniques that retain natural vegetation and retain natural drainage patterns. (where feasible) 7 Stabilize soil within fourteen (14) days of clearing or inactivity in construction. 8 Stabilize or cover soil stockpiles at the end of EACH workday. 9 Employ wind erosion techniques to prevent the blowing of dust or sediment from the site. 10 Employ techniques that divert upland runoff past disturbed slopes. (where necessary) X 11 Provide sediment controls in the form of settling basins, sediment traps or tanks, and perimeter controls. (where necessary) X City of Kalispell, Montana Stormwater Management Checklist LESS Than One Acre Permit Number ________________ Date Submitted________________ Site Name/Address:_____________________________________________________________ _____________________________________________________________________________ LessChecklist 2 Required Best Management Practice (BMPs) Stormwater Management Plan Descriptive Narrative *Show on Map Initial Here 12 Protect adjacent properties by the use of a vegetated buffer strip, silt fence, fiber rolls or other BMP perimeter controls. X 13 Install and maintain a vehicle tracking approach per City of Kalispell Standards for Design and Construction. X 14 Keep solid waste materials in either a container or an enclosed waste collection area on site. X 15 Store chemicals, paint, petroleum, fertilizer and pesticides in a covered enclosure. X 17 Dispose of empty/unused chemical and hazardous waste containers in accordance with label instruction. 18 Segregate potentially hazardous waste from non-hazardous waste. 19 Perform daily cleanup of construction site to ensure that all litter is contained in an appropriate enclosure or container. X 20 Recycle waste materials where feasible. 21 Contain concrete truck washout water on site in a designated washout pit, and remove and properly dispose of concrete residue at conclusion of construction. X 22 Ensure exposed aggregate waste wash water does not leave the construction site and or get into the curb and gutters, catch basins or any other storm conveyance systems. 23 Locate sanitary waste facilities a minimum of 15 feet from storm drain inlets and receiving waterbodies. X 24 Delineate and stake the Flood Plain and install perimeter BMPs. X 25 List waterbodies within 200’ of project. (stream, lake, river, wetland, slough, other) X 26 List stormwater conveyance systems within 100’ of project. (ditch, swale, detention facility, storm drain inlet, drywell, gutter, pipe inlet/outlet) X *Show on Map: X requires BMP item to be shown on Stormwater Management Map. Less Map 1 Draw Map on back of this paper. The Map should include the following items and symbols: ⎯ North arrow ⎯ Street name ⎯ Construction site location or address ⎯ Location of stormwater conveyance system(s) within 100’of project 1. Ditch: d→d→d 2. Culvert: c→ 3. Catch basin inlet: ⊕ 4. Detention facility: ⎯ Location and name of waterbodies within 200’of project (stream, lake, wetland, river, slough) ⎯ Tracking approach: ⎯ Perimeter control 1. Silt Fence: SF SF 2. Fiber Roll: FR FR ⎯ Catch basin inlet protection: ⊕IP ⎯ Concrete washout area: © ⎯ Erosion control blanket: ⎯ Flow direction → ⎯ Covered trash container: ⎯ Stock pile Area: SP ⎯ Other Relevant Items City of Kalispell, Montana Stormwater Management Permit Application MAP Permit Number ________________ Date Submitted________________ Site Name/Address:____________________________________________________________ ____________________________________________________________________________ DF T SWM Permit Application Page 1 of 2 Note: This permit is separate from any permits required by the Montana Department of Environmental Quality. A State Stormwater Construction Permit is required for all land disturbance activities equal to or greater than one (1) acre or for land disturbance activities less than one (1) acre that are part of a larger common plan of development or sale that would disturb one (1) acre or more. **No land disturbance is permitted on any project site without an approved City of Kalispell Stormwater Management Permit** (1) Contact Information: (a) Project Owner Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: (b) Contractor Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: (c) Engineer Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: (2) Project Information Project Address : Lot Number: Subdivision (if applicable): Project Size: (Land Disturbance) LESS than one acre $10.00 GREATER or equal to one acre $45.00 (3) Nature of Construction Check the appropriate box(es) or provide a brief description that indicates the general nature of the construction activities. Single Family Residential Multi-Family Residential Utility Commercial/Industrial Highway / Road Other (describe): Description of proposed work: City of Kalispell, Montana Stormwater Management Permit Application Permit Number _________________ Date Submitted_________________ Final Stabilization Date __________ Public Works Department 306 1st Ave East Kalispell, Montana 59901 (406) 758‐7720 SWM Permit Application Page 2 of 2 City of Kalispell, Montana Stormwater Management Permit Application Permit Number ________________ Date Submitted________________ Final Stabilization Date _________ (4) Project Schedule Start Date: Completion Date: Final Stabilization Date: (5) Waterbodies and Storm Conveyance Systems (a) List Waterbodies within 200’ of project Streams: Lakes: Wetlands: Rivers: Sloughs: Other: (b) List Storm Conveyance Systems within 100’ of project Ditches: Swales: Detention Facilities: Storm Drain Inlets: Pipe Inlets/Outlets: Gutter: (6) Acknowledgement Certificate: I certify that I am the Owner or Owner’s authorized agent. If acting as an authorized agent, I further certify that I am authorized to act as the Owners agent regarding the property at the above-referenced address for the purpose of filing applications for decisions, permits or review under the City of Kalispell Ordinance 1600 and have full power and authority to perform on behalf of the Owner all acts required to enable the City to process and review such applications I certify that the information on this application is true and correct and understand that I shall not start this project until this application is approved. I shall comply with the laws of the State of Montana and the ordinances of the City of Kalispell. ______________________________________________________ _______________ Signature of Legally Responsible Person (Submission must include original signature) Date Signed ________________________________________________________________________ _____________________ Name (printed) Title **For Official Use Only** LESS than one acre Received City By Date SMP Checklist Yes NoField Visit SMP Plan Yes NoApproval SMP Map Yes NoComments: Payment-$10.00 Yes No GREATER or equal to one acre Received MT Stormwater Discharge Permit (NOI) Yes No SWPPP Yes No Site Map showing BMPs Yes No MT Stormwater Discharge Permit (NOT) Yes No SMP Checklist Yes No SMP Plan Yes No SMP Map Yes No Payment-$45.00 Yes No New construction subject to impact fees Yes No SWM Permit Transfer Page 1 of 1 Note: This permit is separate from any permits required by the Montana Department of Environmental Quality. A State Stormwater Construction Permit is required for all land disturbance activities equal to or greater than one (1) acre or for land disturbance activities less than one (1) acre that are part of a larger common plan of development or sale that would disturb one (1) acre or more. (1) New Contact Information: (a) Project Owner Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: (b) Contractor Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: (c) Engineer Contact Person: Company: Mail Address: State: Zip: Phone: Email: Fax: Mobile: Other: City of Kalispell, Montana Stormwater Management Permit Transfer Permit Number _______________________ Public Works Department 306 1st Ave East Kalispell, Montana 59901 (406) 758‐7720 (3) Acknowledgement Certificate: I certify that I am the Owner or Owner’s authorized agent. If acting as an authorized agent, I further certify that I am authorized to act as the Owners agent regarding the property at the above-referenced address for the purpose of filing applications for decisions, permits or review under the City of Kalispell Ordinance 1600 and have full power and authority to perform on behalf of the Owner all acts required to enable the City to process and review such applications I certify that the information on this application is true and correct and I shall comply with the laws of the State of Montana and the ordinances of the City of Kalispell. ______________________________________________________ _______________ Signature of Legally Responsible Person (Submission must include original signature) Date Signed ________________________________________________________________________ _____________________ Name (printed) Title (2) Project Information Project Size: (Land Disturbance) LESS than one acre GREATER or equal to one acre Stormwater Management Regulations For Land Disturbance Sites GREATER or equal to One Acre Greater Permit Cover Notice Page 1 of 2 Stormwater Management is increasingly important for the purpose of maintaining clean water and preserving waterbodies such as streams, rivers, and lakes. The City of Kalispell’s Stormwater Management Ordinance 1600 went into effect May 2, 2007, as mandated under the Federal Clean Water Act (CWA) and the Montana Pollution Discharge Elimination (MPDES) regulation. These regulations are designed to improve water quality in waterbodies by reducing the amount of pollutants that stormwater collects and carries into storm conveyance systems. In order for a construction project to begin follow the steps below regarding stormwater permits and requirements. There are two sets of guidelines one from the Montana Department of Environmental Quality (MDEQ) and a second from the City of Kalispell. MDEQ Requirements for the General Permit for Stormwater Discharges Associated with Construction Activity (Permit MTR100000) 1. Develop a Stormwater Pollution Prevention Plan (SWPPP) • The SWPPP is a document that is developed to direct and assist operators in identifying sources of potential pollutants at the construction activity site and Best Management Practices (BMPs) to be used to help ensure pollutants do not impact receiving surface water through stormwater runoff. • The SWPPP must contain a narrative description of the project and a drawing of the site with proposed improvements and BMPs. • The plan is to be kept on site and available for inspection by MDEQ and the City of Kalispell. 2. Review and submit a Notice of Intent (NOI) • To obtain the forms necessary to complete the NOI refer to the MPDES General Permit for Stormwater Discharges Associated with Construction Activity, which can be downloaded from www.deq.state.mt.us. 3. Provide a copy of the NOI, SWPPP, and approval letter to the City of Kalispell Public Works Department a minimum of 5 days prior to starting land disturbance activities. 4. Post a copy of the complete NOI and SWPPP at the construction site until completion of construction activity. 5. Implement SWPPP prior to beginning land disturbance activity. 6. Inspect and maintain BMPs outlined in Permit MTR100000 7. At the completion of the project submit a Notice of Termination (NOT) following permit requirements. A copy of the NOT must be submitted to the City of Kalispell Public Works Department. City of Kalispell, Montana Public Works Department Stormwater Erosion/Sediment/Pollution Prevention Regulation For Land Disturbance Sites GREATER or Equal to One Acre Greater Permit Cover Notice Page 2 of 2 City of Kalispell Stormwater Management Permit Requirements 1. Submit a complete Stormwater Management Permit Application to the City of Kalispell Public Works Department a minimum of five (5) days prior to land disturbance. • The permit application must have the following complete forms 1. Stormwater Management Permit Application Form 2. Stormwater Management GREATER Checklist (included in application packet) 3. NOI, SWPPP, Site Map and approval letter from DEQ • The permit fee of $45 for sites greater than or equal to one (1) acre is to be paid at the time the permit application is submitted. 2. Inspect and Maintain BMPs • The permittee(s) will be required to perform a site inspection every 14 days and after major storm events to ensure all BMPs have been constructed and are functioning properly. • All inspections shall be documented in written form, kept on the project site, and made available for review by the City. 3. All changes and notifications submitted to DEQ for the General Permit must also be submitted to the City. This includes notification of facility contact changes and changes to authorization. 4. At the completion of the project, submit a copy of the Notice of Termination (NOT) to the City of Kalispell Public Works Office. City Inspection and Review Site plan review and inspection programs aid in compliance and enforcement, and provide an opportunity for guidance and education. The City will perform a site plan review for potential water quality impacts at the time the Stormwater Management Permit is submitted and will conduct regular inspections of the construction sites. Violation and Enforcement If any violation is found, a notice will be issued to the Responsible Party. The notice will state the nature of the alleged violation(s), the action required to fix the violation(s), and a time limit to fix the violation(s). The City has the authority to issue a stop work order, clean the public way and bill the owner directly for the actual cost of cleanup plus a $200 administrative fee, and issuing a civil citations. Any person, firm, or corporation violating any of the provisions or terms of Ordinance #1600 of the City of Kalispell may be subject to penalties as a municipal infraction pursuant of Chapter 1, Article II of the Kalispell City Code. Each day of continued violation shall constitute a separate, additional offence. If you have any questions contact the Public Works Department at 306 1st Ave. E., (Phone) 406- 758-7720. GreaterChecklist 1 Required Best Management Practice (BMPs) 1Described in SWPPP On Page (__) In Section (___) 2Shown on Site Map Initial Here 1 Prevent silt, dirt, topsoil, etc. from washing into the streets, alleys, drainage easements, drainage conveyance systems, and storm drains. 2 Identify all erosion and sediment control BMPs to be installed and maintained throughout the duration of the project. 3 Identify Spoil area, storage area, and staging area locations as part of the project/construction site. 4 Establish permanent erosion control for all disturbed land areas related to the project activity before final occupancy of structures located thereon. 5 Identify staff to do required site inspections and record keeping. 6 Identify clearing techniques that retain natural vegetation and retain natural drainage patterns. 7 Stabilize soil within fourteen (14) days of clearing or inactivity in construction. 8 Stabilize or cover soil stockpiles at the end of EACH workday. 9 Identify wind erosion techniques to prevent the blowing of dust or sediment from the site. 10 Identify techniques that divert upland runoff past disturbed slopes. (where necessary) 11 Provide sediment controls in the form of settling basins, sediment traps or tanks, and perimeter controls. (where necessary) 12 Protect adjacent properties by the use of a vegetated buffer strip, or in combination with perimeter controls. 13 Provide stabilization adequate to prevent erosion at the outlets of all pipes and channels. 14 Install and maintain a vehicle tracking approach per City of Kalispell Standards for Design and Construction. City of Kalispell, Montana Stormwater Management Checklist GREATER or Equal to One Acre Permit Number ________________ Date Submitted________________ Site Name/Address:____________________________________________________________ ____________________________________________________________________________ GreaterChecklist 2 Required Best Management Practice (BMPs) 1Described in SWPPP On Page (__) In Section (___) 2Shown on Site Map Initial Here 15 Keep solid waste materials in either a container or an enclosed waste collection area on site. Identify trash container. 16 Store chemicals, paint, petroleum, fertilizer, and pesticides in a covered enclosure. 17 Dispose of empty/unused chemical and hazardous waste containers in accordance with label instruction. 18 Perform daily cleanup of construction site to ensure that all litter is contained in an appropriate enclosure or container. 20 Identify on site staff to perform item 19. 20 Contain concrete truck washout water on site in a designated washout pit and remove and properly dispose of concrete residue at conclusion of construction. 21 Ensure exposed aggregate waste wash water does not leave the construction site and/or get into the curb and gutter, catch basins, or any other storm conveyance systems. 22 Locate sanitary waste facilities a minimum of 15 feet from storm drain inlets and receiving waterbodies. 23 Other: 24 Delineate and stake the Flood Plain and install perimeter BMPs. 25 List receiving waters within 200’ of project. (stream, lake, river, wetland, slough, other) 26 List stormwater conveyance systems within 100’ of project. (ditch, swale, detention facility, storm drain inlet, drywell, gutter, pipe inlet/outlet) 1. If a BMP is not described on the attached SWPPP provide a brief narrative on how that BMP will be implemented. 2. Mark with X to indicate the BMP is shown on the attached SWPPP Site Map.