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Home My WebLink AboutTCFStormwaterReport043019 STORMWATER DESIGN REPORT & CALCULATIONS FOR: TOWN & COUNTRY FOODS BOZEMAN, MT Prepared By: M MADISON ENGINEERING Madison Engineering 895 Technology Drive, Suite 203 Bozeman, MT 59718 (406) 586-0262 J.O. 18-121 MAY 2019 Ferguson Farms-Block 5 Stormwater Existing Retention Basin Summary and Redesign Calculations WEST SIDE Retention Pond#1 South-C&H Design Report(June 2013) Revised volume held between contours-Madison Engineering(April 2019) Cumulative Contour Area(ftZ) Delta V(ft) Volume(ft') 4819.00 2,014 4820.0 3,254 2,634 2,634 4821.0 4,610 3,932 6,566 4821.5 5,347 2,489 9,055 Redesign storage volume(ft)= 9,055 As constructed(existing)storage volume(ft3)= 2,521 Retention Pond#1 North-C&H Design Report(June 2013) Revised volume held between contours-Madison Engineering(April 2019) Cumulative Contour Area(ft2) Delta V(ft') Volume(ft3) 4817.00 1,013 4818.0 1,758 1,386 1,386 4819.0 2,633 2,196 3,581 4820.0 3,637 3,135 6,716 482&5 4,204 1,960 8,676 Redesign storage volume(ft)= 8,676 As constructed(existing)storage volume(ft3)= 20,982 Redesign combined storage volume(ft)= 17.732 As constructed(existing)storage volume(ft3)= 23.503 C&H design combined storage volume(ft)= 17,604 See page 16 of C&H Report EAST SIDE Retention Pond#2 South-C&H Design Report(June 2013) Revised volume held between contours: Stormtank System Stormtalk Modules Area 22'x 132' 2,904 sf Stormtalk Modules Height 36 inches Stormtalk Modules Volume 8,712 cf 94%effcieny volume 8,189 cf Redesign storage volume(ft)= 8,189 As constructed storage volume(ft3)= 3,368 Retention Pond-#2 North-C&H Design Report(June 2013) Stormtank System Stormtalk Modules Area 22'x 132' 2,904 sf Stormtalk Modules Height 36 inches Stormtalk Modules Volume 8,712 cf 94%effcieny volume 8,189 cf Redesign storage volume(ft)= 8,189 As constructed storage volume(ft3)= 4,016 Redesign combined storage volume(ft)= 16,379 As constructed combined storage volume(ft3)= 7.384 C&H design combined storage volume(ft)= 15.934 See page 16 of C&H Report Ferguson Farms-Stormwater Retention Basin Summary-04-27-19 TOWN & COUNTRY FOODS Lot 1 -4 Block 5 Ferguson Farms Subd. Stormwater Calculations East Parking Lot (Reference: Bozeman Stormwater Master Plan - 1982) Design Rainfall Freq. 25 year(see page III -5 of master plan) IDF coefficient a 0.78 IDF coefficient b IDF coefficient n 0.64 Pre-development Calculations C Areas (ft): Impervious 86,089 0.90 Landscaped 7,486 0.20 Total: 93,575 total area: 2.15 acres composite C: 0.84 Overland t, average slope: 3 percent travel distance: 310 feet t,: 6 minutes Channel t, channel t�. minutes Total t,: 6 minutes intensity at tc(fig 23): 3.46 in/hr pre-devel peak runoff: 6.28 cfs Stormwater Run-off Calculations- East Pavement TOWN &COUNTRY FOODS Lot 1 -4 Block 5 Ferguson Farms Subd. Stormwater Calculations Roof Area (Reference: Bozeman Stormwater Master Plan - 1982) Design Rainfall Freq. 25 year(see page III -5 of master plan) IDF coefficient a 0.78 IDF coefficient b IDF coefficient n 0.64 Pre-development Calculations C Areas (ft): Impervious 33,932 0.90 Landscaped 0.20 Total: 33,932 total area: 0.78 acres composite C: 0.90 Overland t, average slope: 0.5 percent travel distance: 250 feet tc: 7 minutes Channel t. channel t, minutes Total tr: 7 minutes intensity at t,(fig 23): 2.96 in/hr pre-devel peak runoff: 2.08 cfs Stormwater Run-off Calculations- Roof TOWN & COUNTRY FOODS Lot 1 -4 Block 5 Ferguson Farms Subd. Stormwater Calculations West Pavement Area (Reference: Bozeman Stormwater Master Plan - 1982) Design Rainfall Freq. 25 year(see page III -5 of master plan) IDF coefficient a 0.78 IDF coefficient b IDF coefficient n 0.64 Pre-development Calculations C Areas (ft): Impervious 12,721 0.90 Landscaped 670 0.20 Total: 13,390 total area: 0.31 acres composite C: 0.87 Overland t, average slope: 1.65 percent travel distance: 250 feet tc: 6 minutes Channel t, channel t, minutes Total t,: 6 minutes intensity at tc(fig 23): 3.45 in/hr pre-devel peak runoff: 0.92 cfs Stormwater Run-off Calculations-West Pavement TOWN &COUNTRY FOODS Lot 1 -4 Block 5 Ferguson Farms Subd. Pipe Capcity Calculations 25-year Storm Event Basin Area (sf) C Value I in/hr) Q(cfs) East 93,575 0.84 3.46 6.28 Roof 33,932 0.78 2.96 2.08 West 13,390 0.87 3.45 0.92 Capacity Contributing In Flow Pipe Size Slope (%) (cfs) Area Q(cfs) A 18" 0.3 6.83 East 6.28 B 18" 0.3 6.83 East 6.28 C 15" 0.5 5.94 Roof 2.08 D 21" 0.2 9.21 East& Roof 8.36 E 21" 0.25 10.3 E, W& Roof 9.28 Pipe Capcity Calculations Town & Country - 15" PVC Pipe Capacity Project Description Friction Method Manning Formula Solve For Full Flow Capacity Input Data Roughness Coefficient 0.010 Channel Slope 0.5 % Normal Depth 15 in Diameter 15 in Discharge 5.94 ft'/s Results Discharge 5.94 ft'/s Normal Depth 15 in Flow Area 1.23 ftZ Wetted Perimeter 3.93 ft Hydraulic Radius 4 in Top Width 0.00 ft Critical Depth 0.99 ft Percent Full 100.0 Critical Slope 0.00539 ft/ft Velocity 4.84 ft/s Velocity Head 0.36 ft Specific Energy 1.61 ft Froude Number 0.00 Maximum Discharge 6.39 ft'/s Discharge Full 5.94 ft/s Slope Full 0.00500 ft/ft Flow Type SubCritical GVF Input Data Downstream Depth 0 in Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0 in Profile Description Profile Headloss 0.00 ft Average End Depth Over Rise 0.00 Bentley Systems,Inc. Haestad Methods SoIE*odd)sil6vMaster V81(SELECTserles 1) 108.11.01.03] 4/27/2019 6:04:31 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06796 USA +1-203-755-1666 Page 1 of 2 Town & Country - 15" PVC Pipe Capacity GVF Output Data Normal Depth Over Rise 100.00 % Downstream Velocity Infinity ft/s Upstream Velocity Infinity ftts Normal Depth 15 in Critical Depth 0.99 ft Channel Slope 0.5 Critical Slope 0.00539 fttft Bentley Systems,Inc. Haestad Methods SolBgatld$eFftwMaster V81(SELECTseries 1) [08.11.01.03] 4/27/2019 6:04:31 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-755-1666 Page 2 of 2 Town & Country - 18" PVC Pipe Capacity Project Description Friction Method Manning Formula Solve For Full Flow Capacity Input Data Roughness Coefficient 0.010 Channel Slope 0.3 Normal Depth 18 in Diameter 18 in Discharge 6.83 ft°/s Results Discharge 6.83 fN/s Normal Depth 18 in Flow Area 1.77 ftz Wetted Perimeter 4.71 ft Hydraulic Radius 5 in Top Width 0.00 ft Critical Depth 1.01 ft Percent Full 100.0 Critical Slope 0.00394 ft/ft Velocity 3.86 ft/s Velocity Head 0.23 ft Specific Energy 1.73 ft Froude Number 0.00 Maximum Discharge 7.34 ft'/s Discharge Full 6.83 ft'/s Slope Full 0.00250 ft/ft Flow Type SubCritical GVF Input Data Downstream Depth 0 in Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0 in Profile Description Profile Headloss 0.00 ft Average End Depth Over Rise 0.00 Bentley Systems,Inc. Haestad Methods SolModdp#IbwMaster V81(SELECTserles 1) [08.11.01.03] 4/2712019 5:38:42 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-755-1666 Page 1 of 2 Town & Country - 18" PVC Pipe Capacity GVF Output Data Normal Depth Over Rise 100.00 % Downstream Velocity Infinity fits Upstream Velocity Infinity ft/s Normal Depth 18 in Critical Depth 1.01 ft Channel Slope 0.3 % Critical Slope 0.00394 ft/ft Bentley Systems,Inc. Haestad Methods SolBtlatlBpaFilNrMaster V81(SELECTseries 1) [08.11.01.03] 4/27/2019 5:38:42 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-755-1666 Page 2 of 2 Town & Country - 21" PVC Pipe Capacity 0.20% Project Description Friction Method Manning Formula Solve For Full Flow Capacity Input Data Roughness Coefficient 0.010 Channel Slope 0.20 % Normal Depth 21 in Diameter 21 in Discharge 9.21 ft3/s Results Discharge 9.21 ft'/s Normal Depth 21 in Flow Area 2.41 ft2 Wetted Perimeter 5.50 ft Hydraulic Radius 5 in Top Width 0.00 ft Critical Depth 1.13 ft Percent Full 100.0 Critical Slope 0.00357 ft/ft Velocity 3.83 ft/s Velocity Head 0.23 ft Specific Energy 1.98 ft Froude Number 0.00 Maximum Discharge 9.91 ft'/s Discharge Full 9.21 ft/s Slope Full 0.00200 ft/ft Flow Type SubCritical GVF Input Data Downstream Depth 0 in Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0 in Profile Description Profile Headloss 0.00 ft Average End Depth Over Rise 0.00 Bentley Systems,Inc. Haestad Methods SolMadd#ilbrrMaster V81(SELECTseries 1) [08.11.01.033 4/27/2019 7:36:43 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-755-1666 Page 1 of 2 Town & Country - 21" PVC Pipe Capacity @ 0.20% GVF Output Data Normal Depth Over Rise 100.00 Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 21 in Critical Depth 1.13 ft Channel Slope 0.20 Critical Slope 0.00357 ft/ft Bentley Systems,Inc. Haestad Methods SolBbodd)F6rvMaster V81(SELECTseries 1) [08.11.01.03] 4127/2019 7:36:43 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-755-1666 Page 2 of 2 Town & Country - 21" PVC Pipe Capacity @ 0.25% Project Description Friction Method Manning Formula Solve For Full Flow Capacity Input Data Roughness Coefficient 0.010 Channel Slope 0.25 % Normal Depth 21 in Diameter 21 in Discharge 10.30 ft3/s Results Discharge 10.30 ft/s Normal Depth 21 in Flow Area 2.41 ft2 Wetted Perimeter 5.50 ft Hydraulic Radius 5 in Top Width 0.00 ft Critical Depth 1.20 ft Percent Full 100.0 Critical Slope 0.00380 ft/ft Velocity 4.28 ft/s Velocity Head 0.28 ft Specific Energy 2.03 ft Froude Number 0.00 Maximum Discharge 11.08 ft3/s Discharge Full 10.30 ft/s Slope Full 0.00250 ft/ft Flow Type SubCritical GVF Input Data Downstream Depth 0 in Length 000 ft Number Of Steps 0 GVF Output Data Upstream Depth 0 in Profile Description Profile Headloss 0.00 ft Average End Depth Over Rise 0.00 % Bentley Systems,Inc. Haestad Methods SolBikoddprMaster V81(SELECTserles 1) [00.11.01.03] 4127/2019 7:35:29 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-755-1666 Page 1 of 2 Town & Country - 21" PVC Pipe Capacity @ 0.25% GVF Output Data Normal Depth Over Rise 100.00 Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 21 in Critical Depth 1.20 ft Channel Slope 0.25 % Critical Slope 0.00380 ft/ft Bentley Systems,Inc. Haestad Methods SolWhatl rMaster VBI(SELECTseries 1) [08.11.01.03] 4/27/2019 7:35:29 PM 27 Slemons Company Drive Suite 200 W Watertown,CT 06795 USA +1-203-755-1666 Page 2 of 2