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5C- storm pond calculation
10yrBasin Area (ac):0.6126,435.86 (sq ft)Post-Dev C (weighted):0.24Storm Duration (min)120.00Area Runoff (square feet) Coefficient CalculationsAsphaltic and Concrete667.00 0.95 633.65Unimproved area15322.84 0.10 1532.28Heavy Soil (flat)6978.00 0.17 1186.26Heavy Soil (average)550.00 0.22 121.00Drives, Walks and Roofs2918.00 0.95 2772.10Totals26435.84 6245.29Cw =0.24Storm Event (yr):2-yr, 2-hr 10-yr, 2-hr 25-yr, 2-hr 100-yr, 2-hr 100-yr, 24-hrCorrection Factors1.00 1.00 1.10 1.25 1.25Composite C:0.24 0.24 0.24 0.24 0.24Correction factor* C:0.24 0.24 0.26 0.30 0.30Storm Intensity (in/hr)*:0.24 0.41 0.49 0.61 0.10Post-Dev Qp (cfs):0.03 0.06 0.08 0.11 0.02V100YR/2HR :787.11cf V100YR/24HR :1,517.45cf10-Year, 2 Hour StormPond Area:835.00sfPond Area:835.00sfDuration Time:7,200.00sec Infiltration Rate:0.00in/hr Infiltration Rate:0.10in/hrV10YR/2HR :423cfVolume Infiltrated :0.00cf Volume Infiltrated :167.00cfMax Pond Storage: 951.00cf Max Pond Storage: 951.00cfMax Pond Capacity 951.00 cf Max Pond Capacity 1,118.00 cfCN= 83S= 2.0 inIa = 0.4 in0.5" - Ia=0.1 inV1/2":199 cf*Values are from COB Design Standards Figure 2 - Rainfall Intensity Duration in MinutesPond Size: 100 Year Storm (Includes Infiltration)Runoff Treatment Volume (Initial 0.5"):705 S ChurchRetention System 1Design Storm Frequency =Design Storm: 10-Year, 2-Hour (City of Bozeman)Weighted Runoff Co-efficent:Runoff Rate (Rational Method): 10yrBasin Area (ac):0.7934,298.26 (sq ft)Post-Dev C (weighted):0.20Storm Duration (min)120.00Area Runoff (square feet) Coefficient CalculationsAsphaltic and Concrete1877.13 0.95 1783.27Unimproved area25477.00 0.10 2547.70Heavy Soil (flat)4877.00 0.17 829.09Heavy Soil (average)145.00 0.22 31.90Drives, Walks and Roofs1922.00 0.95 1825.90Totals34298.13 7017.86Cw =0.20Storm Event (yr):2-yr, 2-hr 10-yr, 2-hr 25-yr, 2-hr 100-yr, 2-hr 100-yr, 24-hrCorrection Factors1.00 1.00 1.10 1.25 1.25Composite C:0.20 0.20 0.20 0.20 0.20Correction factor* C:0.20 0.20 0.23 0.26 0.26Storm Intensity (in/hr)*:0.24 0.41 0.49 0.61 0.10Post-Dev Qp (cfs):0.04 0.07 0.09 0.12 0.02V100YR/2HR :884.49cf V100YR/24HR :1,705.17cf10-Year, 2 Hour StormPond Area:444.00sfPond Area:444.00sfDuration Time:7,200.00sec Infiltration Rate:0.00in/hr Infiltration Rate:0.00in/hrV10YR/2HR :476cfVolume Infiltrated :0.00cf Volume Infiltrated :0.00cfMax Pond Storage: 887.00cf Max Pond Storage: 887.00cfMax Pond Capacity 887.00 cf Max Pond Capacity 887.00 cfCN= 83S= 2.0 inIa = 0.4 in0.5" - Ia=0.1 inV1/2":258 cf*Values are from COB Design Standards Table 6.5.2- Rainfall Intensity Duration in MinutesPond Size: 100 Year Storm (Includes Infiltration)Runoff Treatment Volume (Initial 0.5"):705 S ChurchRetention System 2Design Storm Frequency =Design Storm: 10-Year, 2-Hour (City of Bozeman)Weighted Runoff Co-efficent:Runoff Rate (Rational Method):