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Home My WebLink About20 - Design Report - Arrowleaf Park & Perennial Park - Water, Sewer 234 E Babcock Street, Suite 3  Bozeman, MT 59715  (406) 586-0277 WATER & SEWER REPORT FOR ARROWLEAF PARK & PERENNIAL PARK Bozeman, Montana TD&H Engineering Project Number: B19-006 Prepared: May 4th, 2020 TD&H ENGINEERING 234 E. Babcock Street, Suite 3 Bozeman, MT 59715 5/4/2020 TABLE OF CONTENTS Project Description 1 Design Report Water 1 Design Report Sewer 4 APPENDICES: A. Plans and Profiles B. Design Calculations C. Water Modeling 1 PROJECT DESCRIPTION: The Arrowleaf Park & Perennial Park proposed project site is located within the Northwest ¼ of Section 1 of Township 2 South and Range 5 East P.M.M. The project located in Bozeman, Montana, is between Tschache Lane and East Baxter Lane and between Sacco Drive and Walton’s Stream/Ditch. The proposed site improvements cover the majority of the site with commercial buildings located on the south side of the property and apartment buildings scattered on the rest of the property. The proposed project also includes asphalt drives and parking lots, concrete sidewalks, utility services and landscaping. Design Report: Water: The proposed project site has three water stubs extending onto the property from Sacco Drive. The water stubs which extend onto the property consist of one twelve inch and two eight inch connections. Based on the layout of the proposed site, not all of the water stubs available are proposed to be used for this project site. All new water mains will be class 51, ductile iron pipe and installed per the Montana Public Works Standard Specifications (MPWSS) and the City of Bozeman Modifications to MPWSS. Hydrant leads will be 6-inch ductile iron pipe. Service sizes were determined based on the Uniform Plumbing Code. The proposed eight inch ductile iron water main that will run through the site shall connect to the most northerly water main stub, which is the twelve inch stub located off of Sacco Drive. After making a loop through the site, the proposed eight inch water main shall reconnect to existing water main in Tschache Lane. There is currently no water stub at on Tschache Lane at or near the point of connection. This connection will require digging into the street and installing a twelve by eight tapping tee. The water main shall be dedicated to the City of Bozeman and located in an easement as shown on the plans. The eight inch water stub immediately south of the twelve inch stub from Sacco Drive shall be used as a domestic service line to the proposed 96 Unit Senior Living building located directly east of Sacco Drive. The existing eight inch service shall be reduced by mean of a eight by four inch reducer after an eight inch valve is installed on the stub. The four inch domestic line shall then continue into the building. The fire service shall connect to the building from a six inch service line on the other side of the building. The domestic meter inside the building is proposed to be a 2 inch meter. The last and most southerly available eight inch water stub to the property shall be abandoned. The contractor shall dig into the street and remove the eight inch connection point at the water main and repair the water main with a sleeve or a link of pipe and couplers if necessary. Work 2 shall be done in accordance with the City of Bozeman design standards and specification policy section V.A.6.h. As per the local fire department it has been determined that the project shall include three fire hydrants onsite. Hydrants locations are shown in the attached plans. All proposed buildings shall have sprinkler systems. All of the commercial and residential buildings onsite shall have a fire and domestic service line from the eight inch water main. The estimated demands for the project are summarized in Table 1.0 and calculations are provided in the Appendix. These calculations will be verified by the mechanical designer. Table 1.0 Estimated Water Demands Building Use Average Day Demand (gpd) Max. Day Demand (gpd) Peak Hour Demand (gpm) Commercial Building A: Community Health Partners 9,375 21,561 20 Mixed Use Commercial Building B: Early Learning Center and Promise Building 7,052 16,220 15 Senior Living Building - 96 Unit 35,415 81,454 74 Rowhouse A: 8 unit 2,952 6,788 7 Rowhouse B: 8 unit 2,952 6,788 7 12-Plex A 4,427 10,182 10 12-Plex B 4,427 10,182 10 24 -Plex A 8,854 20,364 19 24 -Plex B 8,854 20,364 19 24 -Plex C 8,854 20,364 19 24 -Plex D 8,854 20,364 19 Community Building 5,903 13,576 13 Total Demands: 107,919 248,207 232 3 Table 1.1 Water Services Line Sizes Building Use Domestic Water Service Size (inch) Fire Line Service Size (inch) Commercial Building A: Community Health Partners 2 4 Mixed Use Commercial Building B: Early Learning Center and Promise Building 2 4 Senior Living Building - 96 Unit 4 6 Rowhouse A: 8 unit 2 2 Rowhouse B: 8 unit 2 2 12-Plex A 1.5 2 12-Plex B 1.5 2 24 -Plex A 2 2 24 -Plex B 2 2 24 -Plex C 2 2 24 -Plex D 2 2 Community Building 0.75 2 The water distribution system was modeled using Bentley’s WaterCAD software. The model was calibrated by simulating Hydraulic Grade Line information and Maximum Day Demand Average Pressure information provided by the City of Bozeman. More than 3,500 gpm is available with a system minimum residual pressure of 20 psi at the new development, which is looped with existing 12” mains on either side of the development. Please see appendix C for modeling results. 4 Sanitary Sewer: The project shall connect to the eight inch sanitary sewer stub on the north end of the project as shown in the plan and profile drawings. The size, depth, and location of the existing sewer stub shall be field verified prior to ordering manholes for the site. The sanitary sewer main running through the site shall be eight inch SDR 35 PVC and installed per the Montana Public Works Standard Specifications (MPWSS) and per the City of Bozeman Modifications to MPWSS. The sanitary sewer main shall be dedicated to the City of Bozeman and located in an easement as shown on the plans. Six inch services shall extend to within five feet of each building where a cleanout shall be installed prior to continuing into the building. Six inch services where used at all locations to minimize grade. The senior living building will have a sewer service coming out of the north and south end of the building due to the length of the building. All sewer services shall be SDR 26 and installed per the Montana Public Works Standard Specifications (MPWSS) and per the City of Bozeman Modifications to MPWSS. The estimated demands for the project are summarized in Table 2.0 and calculations are provided in the Appendix. These calculations will be verified by the mechanical designer. Table 2.0 Estimated Sanitary Sewer Demands Building Use Average Day Demand (gpd) Peak Demand (gpd) Peak Demand (gpm) Commercial Building A: Community Health Partners 993 4,346 4 Mixed Use Commercial Building B: Early Learning Center and Promise Building 3,313 14,212 10 Senior Living Building - 96 Unit 13,841 57,323 40 Rowhouse A: 8 unit 1,279 5,611 4 Rowhouse B: 8 unit 1,279 5,611 4 12-Plex A 1,843 8,042 6 12-Plex B 1,843 8,042 6 24 -Plex A 3,536 15,241 11 24 -Plex B 3,536 15,241 11 24 -Plex C 3,536 15,241 11 24 -Plex D 3,536 15,241 11 Community Building 2,557 11,108 8 Total Demands: 41,092 175,259 126 APPENDIX A Plans and Profiles See Plan set dated May 4, 2020 for Arrowleaf Park and Perennial Park APPENDIX B DESIGN CALCULATIONS Project: Arrowleaf Park & Perennial Park Date: 4-28-20 Water Demand Calculations Commercial Building A: Community Health Partners Residential Units:24 units People:52.08 people 2.17 people /unit per COB Design Standards Commercial Space:19,000.00 sf Commercial Demand:520.55 gpd 10,000 gal/year/1,000 sf per CILWR calc Average Day Demand:9,374.15 gpd ((units)*(people/unit)*(170gpd/person)) + commercial demand Max. Day Demand:21,560.54 gpd 2.3:1 max day to avg day ratio Max. Hour Demand:19.53 gpm 3:1 max hour to avg day ratio Mixed Use Commercial Building B: Early Learning Center and Promise Building Residential Units:12 units People:26.04 people 2.17 people /unit per COB Design Standards Commercial Space:12,000.00 sf Max. Employees&Children:105 GPD/Employee&Child:25 per Table 3.1-1 of DEQ4 for a daycare Total Commercial Flow:2625 gpd Average Day Demand:7,051.80 gpd ((units)*(people/unit)*(170gpd/person)) + commercial demand Max. Day Demand:16,219.14 gpd 2.3:1 max day to avg day ratio Max. Hour Demand:14.69 gpm 3:1 max hour to avg day ratio Project: Arrowleaf Park & Perennial Park Date: 4-28-20 Water Demand Calculations Residential Units: 12-Plex Residential Units:12 units People:26.04 people 2.17 people /unit per COB Design Standards Average Day Demand:4,426.80 gpd ((units)*(people/unit)*(170gpd/person)) Max. Day Demand:10,181.64 gpd 2.3:1 max day to avg day ratio Max. Hour Demand:9.22 gpm 3:1 max hour to avg day ratio There are 2 proposed 12 plexes Residential Units: 24-Plex Residential Units:24 units People:52.08 people 2.17 people /unit per COB Design Standards Average Day Demand:8,853.60 gpd ((units)*(people/unit)*(170gpd/person)) Max. Day Demand:20,363.28 gpd 2.3:1 max day to avg day ratio Max. Hour Demand:18.45 gpm 3:1 max hour to avg day ratio There are 4 proposed 24 plexes Residential Units: Rowhouse Residential Units:8 units People:17.36 people 2.17 people /unit per COB Design Standards Average Day Demand:2,951.20 gpd ((units)*(people/unit)*(170gpd/person)) Max. Day Demand:6,787.76 gpd 2.3:1 max day to avg day ratio Max. Hour Demand:6.15 gpm 3:1 max hour to avg day ratio There are 2 proposed sets of Townhomes Residential Units: Senior Living Residential Units:96 units People:208.32 people 2.17 people /unit per COB Design Standards Average Day Demand:35,414.40 gpd ((units)*(people/unit)*(170gpd/person)) Max. Day Demand:81,453.12 gpd 2.3:1 max day to avg day ratio Max. Hour Demand:73.78 gpm 3:1 max hour to avg day ratio Residential Units: Community Building Residential Units:16 units People:34.72 people 2.17 people /unit per COB Design Standards Average Day Demand:5,902.40 gpd ((units)*(people/unit)*(170gpd/person)) Max. Day Demand:13,575.52 gpd 2.3:1 max day to avg day ratio Max. Hour Demand:12.30 gpm 3:1 max hour to avg day ratio Project: Arrowleaf Park & Perennial Park Date: 4-28-20 Sewer Demand Calculations Commercial Building A: Comm. Health Partners Residential Units:0 units People:0 people 2.17 people /unit per COB Design Standards Thousands of People:0 thousands of people Property Size:2.5 acres Total Residential Flow:0 gpd (units)*(people/unit)*(65gpd/person) Commercial Space:9500 sf Single Family Equivalent:9.5 units 1,000 sf per SFE People:20.62 people 2.17 people/unit per COB Design Standards Thousands of People 0.0206 thousands of people Total Commercial Flow:617.5 gpd (units)*(people/unit)*(65gpd/person) Total Flow Rate:617.5 gpd residential + commercial Infiltration Rate:375 gpd (area) *(150 gpd/acre) Avg. Day Demand:992.5 gpd flow rate + infiltration rate Peaking Factor:4.3787214 Peak Demand:4345.881 gpd (avg. day demand)*(peaking factor) Peak Demand:3.02 gpm (peak demand)/(24hr/day)/(60min/hr) Commercial Building B: Family Promise Building Residential Units:12 units People:26.04 people 2.17 people /unit per COB Design Standards Thousands of People:0.02604 thousands of people Property Size:3 acres Total Residential Flow:1692.6 gpd (units)*(people/unit)*(65gpd/person) Commercial Space:18000 sf Single Family Equivalent:18 units 1,000 sf per SFE People:39.06 people 2.17 people/unit per COB Design Standards Thousands of People 0.0391 thousands of people Total Commercial Flow:1170 gpd (units)*(people/unit)*(65gpd/person) Total Flow Rate:2862.6 gpd residential + commercial Infiltration Rate:450 gpd (area) *(150 gpd/acre) Avg. Day Demand:3312.6 gpd flow rate + infiltration rate Peaking Factor:4.2901331 Peak Demand:14211.495 gpd (avg. day demand)*(peaking factor) Peak Demand:9.87 gpm (peak demand)/(24hr/day)/(60min/hr) Project: Arrowleaf Park & Perennial Park Date: 4-28-20 Sewer Demand Calculations Residential Units: 12-Plex Residential Units:12 units People:26.04 people 2.17 people /unit per COB Design Standards Thousands of People:0.02604 thousands of people Property Size:1 acres Total Flow Rate:1692.6 gpd (units)*(people/unit)*(65gpd/person) Infiltration Rate:150 gpd (area) *(150 gpd/acre) Avg. Day Demand:1842.6 gpd flow rate + infiltration rate Peaking Factor:4.3643 Peak Demand:8041.62 gpd (avg. day demand)*(peaking factor) Peak Demand:5.58 gpm (peak demand)/(24hr/day)/(60min/hr) There are 2 proposed 12 plexes Residential Units: 24-Plex Residential Units:24 units People:52.08 people 2.17 people /unit per COB Design Standards Thousands of People:0.05208 thousands of people Property Size:1 acres Total Flow Rate:3385.2 gpd (units)*(people/unit)*(65gpd/person) Infiltration Rate:150 gpd (area) *(150 gpd/acre) Avg. Day Demand:3535.2 gpd flow rate + infiltration rate Peaking Factor:4.3111 Peak Demand:15240.58 gpd (avg. day demand)*(peaking factor) Peak Demand:10.58 gpm (peak demand)/(24hr/day)/(60min/hr) There are 4 proposed 24 plexes Residential Units: Rowhouse Residential Units:8 units People:17.36 people 2.17 people /unit per COB Design Standards Thousands of People:0.01736 thousands of people Property Size:1 acres Total Flow Rate:1128.4 gpd (units)*(people/unit)*(65gpd/person) Infiltration Rate:150 gpd (area) *(150 gpd/acre) Avg. Day Demand:1278.4 gpd flow rate + infiltration rate Peaking Factor:4.3884 Peak Demand:5610.12 gpd (avg. day demand)*(peaking factor) Peak Demand:3.90 gpm (peak demand)/(24hr/day)/(60min/hr) There are 2 proposed sets of Rowhouses Project: Arrowleaf Park & Perennial Park Date: 4-28-20 Sewer Demand Calculations Residential Units: Senior Living Residential Units:96 units People:208.32 people 2.17 people /unit per COB Design Standards Thousands of People:0.20832 thousands of people Property Size:2 acres Total Flow Rate:13540.8 gpd (units)*(people/unit)*(65gpd/person) Infiltration Rate:300 gpd (area) *(150 gpd/acre) Avg. Day Demand:13840.8 gpd flow rate + infiltration rate Peaking Factor:4.1415 Peak Demand:57322.15 gpd (avg. day demand)*(peaking factor) Peak Demand:39.81 gpm (peak demand)/(24hr/day)/(60min/hr) Residential Units: Community Building Residential Units:16 units People:34.72 people 2.17 people /unit per COB Design Standards Thousands of People:0.03472 thousands of people Property Size:2 acres Total Flow Rate:2256.8 gpd (units)*(people/unit)*(65gpd/person) Infiltration Rate:300 gpd (area) *(150 gpd/acre) Avg. Day Demand:2556.8 gpd flow rate + infiltration rate Peaking Factor:4.3442 Peak Demand:11107.29 gpd (avg. day demand)*(peaking factor) Peak Demand:7.71 gpm (peak demand)/(24hr/day)/(60min/hr) TD&H Sewer Calculations Project: Arrowleaf Park & Perennial Park Pipe Sizing Check - Services Input Values d =6 Inches =0.5 ft y =3 Inches =0.25 ft Calculated Values (Equations from Fluid Mechanics by Chow) Theta (Ø)3.141593 rad 2*arccos(1-y/(d/2)) Area (A)0.10 ft2 (1/8)*(Ø-sinØ)d2 Wetted Perimeter (P)0.79 ft 0.5Ød Hydraulic Radius (R )0.13 ft (.25)*(1-(sinØ)/Ø)d Top Width (T)0.50 ft (sin 0.5Ø)d Mannings Equation (Equation from Fundamentals of Mechanics by Munson) n =0.013 (For PVC per COB Design Standards) S0 =0.02 ft/ft Q = 0.40 cfs Q = 1.49/n*A*R2/3*S0 0.5 Q = 178.55 gpm Q gpm = (Q cfs) (7.48 gal/ft3)(60 sec/min) V = 4.05 ft/s V= Q/A Results A 6" diameter sewer service at a minimum 2 % flowing half has capacity for 178 gpm. A 6" diameter sewer service at a minimum 2 % flowing full has capacity for 357 gpm. TD&H Sewer Calculations Project: Arrowleaf Park & Perennial Park Pipe Sizing Check - Mains Input Values d =8 Inches =0.666667 ft y =4 Inches =0.333333 ft Calculated Values (Equations from Fluid Mechanics by Chow) Theta (Ø)3.141593 rad 2*arccos(1-y/(d/2)) Area (A)0.17 ft2 (1/8)*(Ø-sinØ)d2 Wetted Perimeter (P)1.05 ft 0.5Ød Hydraulic Radius (R )0.17 ft (.25)*(1-(sinØ)/Ø)d Top Width (T)0.67 ft (sin 0.5Ø)d Mannings Equation (Equation from Fundamentals of Mechanics by Munson) n =0.013 (For PVC per COB Design Standards) S0 =0.004 ft/ft Q = 0.38 cfs Q = 1.49/n*A*R2/3*S0 0.5 Q = 171.96 gpm Q gpm = (Q cfs) (7.48 gal/ft3)(60 sec/min) V = 2.20 ft/s V= Q/A Results An 8" diameter sewer service at a minimum 0.4 % flowing half has capacity for approximately 171 gpm. An 8" diameter sewer service at a minimum 0.4 % flowing full has capacity for approximately 344 gpm. APPENDIX C WATER MODELING Scenario: Arrowleaf Park & Perennial Park Maximum Day, Bozeman, MT Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/30/2020 WaterCAD [10.02.03.06] Bentley Systems, Inc. Haestad Methods Solution CenterGNB North.wtg Scenario: Arrowleaf Park & Perennial Park Maximum Day, Bozeman, MT Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/30/2020 WaterCAD [10.02.03.06] Bentley Systems, Inc. Haestad Methods Solution CenterGNB North.wtg FlexTable: Junction Table Fire Flow (Available) (gpm) Pattern (Constituent) Pressure (psi) Hydraulic Grade (ft) Demand (gpm) Elevation (ft) LabelID 3,500Fixed974,958.0004,734.00J-130 3,500Fixed974,958.00154,733.00J-231 3,500Fixed1004,958.00114,728.00J-333 3,500Fixed1004,957.9904,728.00J-435 3,500Fixed1004,957.9904,728.00J-537 3,500Fixed1004,957.98144,727.00J-639 3,500Fixed1004,957.9874,727.00J-741 3,500Fixed1004,957.98144,726.00J-843 3,500Fixed1004,957.9894,726.00J-945 3,500Fixed1004,957.98144,726.00J-1047 3,500Fixed1004,957.9874,726.00J-1149 3,500Fixed1004,957.98144,726.00J-1251 3,500Fixed1004,957.9854,726.00J-1353 3,500Fixed1004,957.9904,726.00J-1455 3,500Fixed1004,958.0054,726.00J-1557 3,500Fixed1004,958.0004,726.00J-1659 3,500Fixed1004,958.00574,728.00J-2994 3,500Fixed1004,958.0004,727.00J-3199 3,500Fixed994,958.0004,730.00J-32102 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/30/2020 WaterCAD [10.02.03.06] Bentley Systems, Inc. Haestad Methods Solution CenterGNB North.wtg CITY OF BOZEMAN Fire Flow Request Form PHONE (406) 582-3200 FAX (406) 582-3201 Date: April 29th, 2020 Location Request: Lowe’s Area (1731 Tschache Lane) Pressure Zone: Northwest Hydrant GIS ID#: 2058, 2064, 2063 Adjacent Main: 12-inch DIP The results of the fire flow information that you requested are as follows: Hydrant ID#: 2058 Maximum Day Demand Available Fire Flow at 20 psi: 13020.21 gpm Maximum Day Demand Minimum Pressure: 99.35 psi Maximum Day Demand Average Pressure: 101.72 psi Maximum Day Demand Maximum Pressure: 103.19 psi Hydrant ID#: 2064 Maximum Day Demand Available Fire Flow at 20 psi: 10272.37 gpm Maximum Day Demand Minimum Pressure: 99.25 psi Maximum Day Demand Average Pressure: 101.62 psi Maximum Day Demand Maximum Pressure: 103.09 psi Hydrant ID#: 2063 Maximum Day Demand Available Fire Flow at 20 psi: 10510.88 gpm Maximum Day Demand Minimum Pressure: 98.5 psi Maximum Day Demand Average Pressure: 100.86 psi Maximum Day Demand Maximum Pressure: 102.33 psi If you have questions or need further information feel free to email. Data Disclaimer: Water distribution information is calculated using hydraulic modeling software and is subject to variation. Actual field conditions may vary. This information is provided to the requestor for evaluation purposes only, without warranty of any kind, including, but not limited to any expressed or implied warranty arising by contract, stature, or law. In no event regardless of cause, shall the City be liable for any direct, indirect, special, punitive or consequential damages of any kind whether such damages arise under contract, tort, strict liability or inequity. HOME OF MONTANA STATE UNIVERSITY GATEWAY TO YELLOWSTONE PARK