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HomeMy WebLinkAbout05 Eng Report Storm Calcs 7-IYALITE R tengonSystem A Design Storm Frequency= 10 yr Design Storm: 10-Year,2-Hour(City of Bozeman) Basin Area(ac): 0.28 12,028.74 (sq ft) Post-Dev C(weighted): 0.69 Storm Duration(min) 120.00 Weighted Runoff Co-efficent: Area Runoff (square feet) Coefficient Calculations Asphaltic and Concrete 7746.80 0.95 7359.46 Heavy Soil(flat) 0.17 0.00 Heavy Soil(average) 4281.94 0.22 942.03 Drives,Walks and Roofs 0.95 0.00 Totals 12028.74 8301.49 C,,,=0.69 Runoff Rate(Rational Method): Storm Event(yr): 2-yr,2-hr 10-yr,2-hr 25-yr,2-hr 100-yr,2-hr 100-yr,24-hr Correction Factors 1.00 1.00 1.10 1.25 1.25 Composite C: 0.69 0.69 0.69 0.69 0.69 Correction factor�C: 0.69 0.69 0.76 0.86 0.86 Storm Intensity(in/hr)*: 0.24 0.41 0.49 0.61 0.10 Post-Dev Qp(cfs): 0.05 0.08 0.10 0.15 0.02 Pond Size: 100 Year Storm(Includes Infiltration) V100YR/2HR� �,046.26 cf V�QQyRI24HR� 2,017.06 cf 70-Year,2 Hour Storm Pond Area: 234.00 sf Pond Area: 234.00 sf Duration Time: 7,200.00 sec Infiltration Rate: 4.00 in/hr Infiltration Rate: 4.00 in/hr V10YR/2HR• 563 cf Volume Infiltrated : 156.00 cf Volume Infiltrated: 1,872.00 cf Max Pond Storage: 502.00 cf Max Pond Storage: 502.00 cf Runoff Treatment Volume(Initial 0.5"): Max Pond Capacity 658.00 cf Max Pond Capacity 2,374.00 cf CN= 91 S= 1.0 in �a= 0.2 Ill 0.5"-la= 0.3 in V,�Z••: 303 cf 'Values are from COB Design Standards Figure 2-Rainfall Intensity Duration in Minutes 7-IYALITE R tengonSystem B Design Storm Frequency= 10 yr Design Storm: 10-Year,2-Hour(City of Bozeman) Basin Area(ac): 0.50 21,707.84 (sq ft) Post-Dev C(weighted): 0.78 Storm Duration(min) 120.00 Weighted Runoff Co-efficent: Area Runoff (square feet) Coefficient Calculations Asphaltic and Concrete 11874.00 0.95 11280.30 Heavy Soil(flat) 4750.84 0.17 807.64 Heavy Soil(average) 0.22 0.00 Drives,Walks and Roofs 5083.00 0.95 4828.85 Totals 21707.84 16916.79 C,,,=0.78 Runoff Rate(Rational Method): Storm Event(yr): 2-yr,2-hr 10-yr,2-hr 25-yr,2-hr 100-yr,2-hr 100-yr,24-hr Correction Factors 1.00 1.00 1.10 1.25 1.25 Composite C: 0.78 0.78 0.78 0.78 0.78 Correction factor�C: 0.78 0.78 0.86 0.97 0.97 Storm Intensity(in/hr)*: 0.24 0.41 0.49 0.61 0.10 Post-Dev Qp(cfs): 0.09 0.16 0.21 0.30 0.05 Pond Size: 100 Year Storm(Includes Infiltration) V100YR/2HR� 2,132.08 cf V�QQyRI24HR� 4,110.36 cf 70-Year,2 Hour Storm Pond Area: 479.00 sf Pond Area: 479.00 sf Duration Time: 7,200.00 sec Infiltration Rate: 4.00 in/hr Infiltration Rate: 4.00 in/hr V10YR/2HR• �,146 cf Volume Infiltrated : 319.33 cf Volume Infiltrated: 3,832.00 cf Max Pond Storage: 502.00 cf Max Pond Storage: 502.00 cf Runoff Treatment Volume(Initial 0.5"): Max Pond Capacity 821.33 cf Max Pond Capacity 4,334.00 cf CN= 91 S= 1.0 in �a= 0.2 Ill 0.5"-la= 0.3 in V,�Z••: 547 cf 'Values are from COB Design Standards Table 6.5.2-Rainfall Intensity Duration in Minutes 7-IYALITE R tengonPondC Design Storm Frequency= 10 yr Design Storm: 10-Year,2-Hour(City of Bozeman) Basin Area(ac): 0.28 12,257.00 (sq ft) Post-Dev C(weighted): 0.47 Storm Duration(min) 120.00 Weighted Runoff Co-efficent: Area Runoff (square feet) Coefficient Calculations Asphaltic and Concrete 0.95 0.00 Heavy Soil(flat) 0.17 0.00 Heavy Soil(average) 8020.00 0.22 1764.40 Drives,Walks and Roofs 4237.00 0.95 4025.15 Totals 12257.00 5789.55 C,,,=0.47 Runoff Rate(Rational Method): Storm Event(yr): 2-yr,2-hr 10-yr,2-hr 25-yr,2-hr 100-yr,2-hr 100-yr,24-hr Correction Factors 1.00 1.00 1.10 1.25 1.25 Composite C: 0.47 0.47 0.47 0.47 0.47 Correction factor�C: 0.47 0.47 0.52 0.59 0.59 Storm Intensity(in/hr)*: 0.24 0.41 0.49 0.61 0.10 Post-Dev Qp(cfs): 0.03 0.05 0.07 0.10 0.02 Pond Size: 100 Year Storm(Includes Infiltration) V100YR/2HR� 729.67 cf V100YRI24HR� �,406.72 cf 70-Year,2 Hour Storm Pond Area: 626.00 sf Pond Area: 626.00 sf Duration Time: 7,200.00 sec Infiltration Rate: 4.00 in/hr Infiltration Rate: 4.00 in/hr V10YR/2HR• 392 cf Volume Infiltrated : 417.33 cf Volume Infiltrated: 5,008.00 cf Max Pond Storage: 502.00 cf Max Pond Storage: 502.00 cf Runoff Treatment Volume(Initial 0.5"): Max Pond Capacity 919.33 cf Max Pond Capacity 5,510.00 cf CN= 91 S= 1.0 in �a= 0.2 Ill 0.5"-la= 0.3 in V,�Z••: 309 cf 'Values are from COB Design Standards Figure 2-Rainfall Intensity Duration in Minutes