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05 Eng Report Storm Calcs
10yrBasin Area (ac):0.2812,028.74 (sq ft)Post-Dev C (weighted):0.69Storm Duration (min)120.00Area Runoff (square feet) Coefficient CalculationsAsphaltic and Concrete7746.80 0.95 7359.46Heavy Soil (flat)0.17 0.00Heavy Soil (average)4281.94 0.22 942.03Drives, Walks and Roofs0.95 0.00Totals12028.74 8301.49Cw =0.69Storm 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:0.69 0.69 0.69 0.69 0.69Correction factor* C:0.69 0.69 0.76 0.86 0.86Storm Intensity (in/hr)*:0.24 0.41 0.49 0.61 0.10Post-Dev Qp (cfs):0.05 0.08 0.10 0.15 0.02V100YR/2HR :1,046.26cf V100YR/24HR :2,017.06cf10-Year, 2 Hour StormPond Area:234.00sfPond Area:234.00sfDuration Time:7,200.00sec Infiltration Rate:4.00in/hr Infiltration Rate:4.00in/hrV10YR/2HR :563cfVolume Infiltrated :156.00cf Volume Infiltrated :1,872.00cfMax Pond Storage: 502.00cf Max Pond Storage: 502.00cfMax Pond Capacity 658.00 cf Max Pond Capacity 2,374.00 cfCN= 91S= 1.0 inIa = 0.2 in0.5" - Ia=0.3 inV1/2":303 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"):EvergoodsRetention System ADesign Storm Frequency =Design Storm: 10-Year, 2-Hour (City of Bozeman)Weighted Runoff Co-efficent:Runoff Rate (Rational Method): 10yrBasin Area (ac):0.5021,707.84 (sq ft)Post-Dev C (weighted):0.78Storm Duration (min)120.00Area Runoff (square feet) Coefficient CalculationsAsphaltic and Concrete11874.00 0.95 11280.30Heavy Soil (flat)4750.84 0.17 807.64Heavy Soil (average)0.22 0.00Drives, Walks and Roofs5083.00 0.95 4828.85Totals21707.84 16916.79Cw =0.78Storm 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:0.78 0.78 0.78 0.78 0.78Correction factor* C:0.78 0.78 0.86 0.97 0.97Storm Intensity (in/hr)*:0.24 0.41 0.49 0.61 0.10Post-Dev Qp (cfs):0.09 0.16 0.21 0.30 0.05V100YR/2HR :2,132.08cf V100YR/24HR :4,110.36cf10-Year, 2 Hour StormPond Area:479.00sfPond Area:479.00sfDuration Time:7,200.00sec Infiltration Rate:4.00in/hr Infiltration Rate:4.00in/hrV10YR/2HR :1,146cfVolume Infiltrated :319.33cf Volume Infiltrated :3,832.00cfMax Pond Storage: 502.00cf Max Pond Storage: 502.00cfMax Pond Capacity 821.33 cf Max Pond Capacity 4,334.00 cfCN= 91S= 1.0 inIa = 0.2 in0.5" - Ia=0.3 inV1/2":547 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"):EvergoodsRetention System BDesign Storm Frequency =Design Storm: 10-Year, 2-Hour (City of Bozeman)Weighted Runoff Co-efficent:Runoff Rate (Rational Method): 10yrBasin Area (ac):0.2812,257.00 (sq ft)Post-Dev C (weighted):0.47Storm Duration (min)120.00Area Runoff (square feet) Coefficient CalculationsAsphaltic and Concrete0.95 0.00Heavy Soil (flat)0.17 0.00Heavy Soil (average)8020.00 0.22 1764.40Drives, Walks and Roofs4237.00 0.95 4025.15Totals12257.00 5789.55Cw =0.47Storm 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:0.47 0.47 0.47 0.47 0.47Correction factor* C:0.47 0.47 0.52 0.59 0.59Storm Intensity (in/hr)*:0.24 0.41 0.49 0.61 0.10Post-Dev Qp (cfs):0.03 0.05 0.07 0.10 0.02V100YR/2HR :729.67cf V100YR/24HR :1,406.72cf10-Year, 2 Hour StormPond Area:626.00sfPond Area:626.00sfDuration Time:7,200.00sec Infiltration Rate:4.00in/hr Infiltration Rate:4.00in/hrV10YR/2HR :392cfVolume Infiltrated :417.33cf Volume Infiltrated :5,008.00cfMax Pond Storage: 502.00cf Max Pond Storage: 502.00cfMax Pond Capacity 919.33 cf Max Pond Capacity 5,510.00 cfCN= 91S= 1.0 inIa = 0.2 in0.5" - Ia=0.3 inV1/2":309 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"):EvergoodsRetention Pond CDesign Storm Frequency =Design Storm: 10-Year, 2-Hour (City of Bozeman)Weighted Runoff Co-efficent:Runoff Rate (Rational Method):