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Home My WebLink About009 Water Demand Report WATER USAGE DEMAND REPORT FOR: HIDDEN CREEK RESIDENTIAL DEVELOPMENT BOZEMAN, MT Prepared By: I NOW A PART OF MADISON � ENGINEERING ��1�,lWC - -� ENGINEF RING WWC Engineering/Madison 895 Technology Blvd, Suite 203 Bozeman, MT 59718 (406) 586-0262 August 2025 WATER USAGE DEMAND REPORT FOR: HIDDEN CREEK RESIDENTIAL DEVELOPMENT BOZEMAN, MT NTANq E N RI No. 8 �SS/0NAL WWC Engineering/Madison 895 Technology Blvd, Suite 203 Bozeman, MT 59718 (406) 586-0262 August 2025 Hidden Creep Residential Development Water System Design Report Summary This report outlines the water daily flow analysis calculations for the proposed Hidden Creek Residential Development. The development is located on a 5.35-acre lot located southwest of the intersection between Juniper Street and Oak Park Drive. The project is proposed to consist of five apartment buildings with supportive services and infrastructure creating 182 new residential units and the south extension of Oak Park Drive. The City will review the water demands calculated in this report and evaluate the adjacent system's capacity to accommodate the estimated demands. The following references were used in the preparation of this report: a. MDEQ Circular No. 1 and 4 b. City of Bozeman Design Standards and Specifications Oct. 2024 Existing System and Proposed Expansion The project will expand the City's existing infrastructure by installing approximately 923 LF of 8" ductile iron water main running south extending from the existing 8" ductile iron water main located under the intersection of Juniper Street and Oak Park Drive. The new water main will extend from this intersection and run south under the proposed Oak Park Drive extension until it reaches another existing 8" ductile iron water main located on the south adjacent property which extends from the main located under Durston Road. The existing system was modelled using hydrant flow data provided by the City of Bozeman. The hydrant used, Hydrant 2152, is located northeast of the project at the intersection of Juniper Street and Oak Park Drive. Proposed Project Demand Each of the five buildings will be served by separate water and fire service lines. Buildings 2 and 3 (as indicated on the Site Plan)will be served by 2" Type K copper water service lines and 4" ductile iron fire service lines. The service lines will branch from the existing 8" ductile iron water main located under Juniper Street. The services will range in length from 63' to 101' which is below the maximum allowed length of 150'. For Buildings 1, 4, and 5, the service lines will be installed off the proposed water main located under the proposed Oak Park Drive extension. Buildings 1 and 4 will have 2" Type K copper water services and 4" ductile iron fire services installed. Building 5 will have a 4" ductile iron water service and 6" ductile iron fire service. All the service lines for Buildings 1, 4, and 5 are designed to be less than 150'. A fire hydrant will be installed at the southern end of the Oak Park Drive extension to serve the Hidden Creek Residential Development Water System Design Report property and remain within the 100' radius of the Fire Department Connection (FDC) at Building 5. To facilitate future water and fire service connections to the County lot, a 4" ductile iron water service line stub and 4" ductile iron fire service line stub will extend into the lot. The CLT lot will have two 2" Type K copper water service line and two 2" Type K copper fire service line stubs extended into the property to allow for future connections. The water usage demand for the UHP lot was calculated using the values per City of Bozeman Design Standards which outlines an average daily usage of 135 gallons per capita per day at 2.17 people per dwelling unit with the proposed number of 182 residential units. gallons per capita people 1 135 * 2.17 * 182 dwelling units J = 53,317 gpd day dwelling unit The UHP lot is predicted to have an average daily flow of 53,317 gpd or 37.0 gpm. As the development plans of the County and CLT lots are not fully known, the average daily demand for these lots was estimated on a per acre basis using the duty factor for R-4 zoning of 3,180 gpad. The water demand of these lots will be further analyzed in subsequent separate site plan applications. Count C 3,180 average daily demand per day 1 * 0.18 acres) = 572 gpd acre The County lot is predicted to have an average daily flow of 572 gpd or 0.40 gpm. CLT Lot: (3,180 average daily demand per day * 0.43 acres J = 1,367 gpd acre The CLT lot is predicted to have an average daily flow of 1,367 gpd or 0.95 gpm. The total development is predicted to have an average daily flow of 55,257 gpd or 38.4 gpm. In addition to the average daily demand, the water main extension must account for peak periods of daily use. Peaking factors are applied to the demand and account for peak periods in daily use. The peaking factors used are maximum daily use and peak hour use which are obtained from the City of Bozeman Design Standards. Table 1 shows the peaking factors and the resultant flows from those factors when applied to the average daily demand of 38.4 gpm. Hidden Creek Residential Development Water System Design Report TABLE 1 PEAKING FACTORS Flow Designation Peaking Factor Flow(gpm) Average Day Demand 1 38.4 Maximum Day Demand 2.3 88.3 Peak Hour Demand 3 115.2 The water usage demand of the development is calculated to have a maximum hour demand of 115.2 gpm. With the addition of a maximum fire suppression system now of 1,500 gpm, the maximum hour flow demand is 1,615.2 gpm. Design Capacity Based on the project water demand calculated above, a maximum hour flow of 1,615.2 gpm is required to serve the development. The flow analysis shows that the proposed 8"ductile iron water main has an available flow of 3,500 gpm,refer to Appendix B—WaterCAD Flow Analysis. Based on this analysis,the proposed water system design provides adequate service to meet the peak hour demand required by the proposed development. This project will require the approval of the City of Bozeman Engineer and MDEQ. Appendices Appendix A—Water Demand Calculations Appendix B—WaterCAD Flow Analysis Hidden Creek Residential Development Water System Design Report Appendix A — Water Demand Calculations Daily Water Usage Analysis Hidden Creek Residential Development Average Dail Hidden Creek Residences Number of Units 182 Residents/unit 2.17 Gallons per Capita/day 135 Average Daily Flow 53,317 gpd County Lot Zoning R-4 Acres 0.18 acres Average Day Demand 3,180 gpad Average Daily Flow 572 gpd CLT Lot Zoning R-4 Acres 0.43 acres Average Day Demand 3,180 gpad Average Daily Flow 1,367 gpd Peak Hour Water Usage Average Day Demand 55,257 gpd Maximum Day Demand 127,090 gpd Peak Hour Demand 165,770 gpd Peak Hour Demand 115.2 gpm Maximum Fire Flow 1500.0 gpm Maximum Hour Demand w/Fire Flow 1615.2 gpm Maximum Hour Demand w/Fire Flow 3.60 cfs Appendix B — WaterCAD Flow Analysis Base Fire Flow Report Base Fire Flow Fire Flow(Needed) 1,500 gpm Velocity(Upper Limit) 15.00 ft/s Fire Flow(Upper Limit) 3,500 gpm Pressure(System Lower Limit) (N/A) psi Pressure(Residual Lower Limit) 20 psi Pipe Velocity Greater Than 0.00 ft/s Pressure(Zone Lower Limit) 20 psi Node Pressure Less Than 0 psi Use Minimum System Pressure False Fire Constraint? Pipe Set Suppression - At Water Main Use Velocity Constraint? True Nodes To Exclude <None> Use Pipe Velocity Greater Than? False Fire Fire Flow Nodes Suppression - At Water Main Use Node Pressure Less Than? False Fire Flow Auxiliary Results Type None Adding to Auxiliary Output Selection Set <No Apply Fire Flows By Baseline Elements> Demand Fire Flow Auxiliary Results Type None 13: Base Fire Flow,Junction and Hydrant Alternative Report * ID Label Specify Local Velocity Fire Flow Fire Flow Pressure Pressure Pressure Fire Flow (Upper (Needed) (Upper (Residual (Zone (System Constraints? Limit) (gpm) Limit) Lower Lower Lower (ft/s) (gpm) Limit) Limit) Limit) (psi) (psi) (psi) True 32 3-2 False 15.00 1,500 3,500 20 20 (N/A) True 35 3-4 False 15.00 1,500 3,500 20 20 (N/A) True 38 3-6 False 15.00 1,500 3,500 20 20 (N/A) True 41 3-8 False 15.00 1,500 3,500 20 20 (N/A) True 44 3-10 False 15.00 1,500 3,500 20 20 (N/A) True 47 3-12 False 15.00 1,500 3,500 20 20 (N/A) True 50 3-14 False 15.00 1,500 3,500 20 20 (N/A) True 53 3-16 False 15.00 1,500 3,500 20 20 (N/A) Bentley Systems,Inc. Haestad Methods Solution WaterGEMS Water Main.wtg Center [24.00.00.271 7/30/2025 76 Watertown Road,Suite 2D Thomaston,CT Page 1 of 1 06787 USA +1-203-755-1666 Scenario: Automated Fire Flow Analysis 71?R-1 p PMP-1 4 �• `s Color Coding Legend Pipe: Diameter (in) <= 2.0 <= 4.0 <= 6.0 J-27 I-28 c <= 8.0 J-7 F,, J-8 Other r: 'l�«Cp0 r11'r J-2 1-SJCnunty 6 Ln J-31 J-17 r FS 4 = `a 4 - J-13 J-14 1 lydrjr,l 1 00 J-2, T Z J J-17 J-18 5.'U St,jti b' rq -J-22 r. F .:L Fs 5 _ J-16 J 15 J-1Fi r' Ilydrijul 1 l J-20 WaterGEMS Water Main.wtg Bentley Systems,Inc. Haestad Methods Solution Center [24.00.00.27] 7/30/2025 76 Watertown Road,Suite 2D Thomaston,CT 06787 USA +1-203- Page 1 of 1 755-1666 Fire Flow Node FlexTable: Fire Flow Results Table Label Fire Flow Fire Flow Fire Flow Pressure Velocity Pressure Junction Is Fire Flow Status (Needed) (Available) (Calculated (Upper (Residual w/ Run Balanced? (gpm) (gpm) Residual) Limit) Lower Minimum (psi) (ft/s) Limit) Pressure (psi) (Zone) 1-2 Passed 1,500 3,500 58 15.00 20 3-20 True J-4 Passed 1,500 3,500 66 15.00 20 3-20 True 3-6 Passed 1,500 3,500 80 15.00 20 3-20 True 3-8 Passed 1,500 3,500 86 15.00 20 3-20 True 3-10 Passed 1,500 3,500 52 15.00 20 3-20 True 3-12 Passed 1,500 3,500 76 15.00 20 3-20 True 3-14 Passed 1,500 3,500 74 15.00 20 3-20 True 1-16 Passed 1,500 3,500 51 15.00 20 3-20 True Bentley Systems,Inc. Haestad Methods Solution WaterGEMS Water Main.wtg Center [24.00.00.271 7/30/2025 76 Watertown Road,Suite 2D Thomaston,CT Page 1 of 1 06787 USA +1-203-755-1666