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STORM CALCS - 22-00308 - Bodifi - Parking Lot Expansion
100-YEAR S T O R M V O L U M E = 2,149 CF ( m i n i m u m ) INSTALLED V O L U M E = 2 , 1 7 2 C F BOWSTRING (MODIFIED RATIONAL) WORKSHEET Design Storm 25 year BODIFY PARKING EXPANSION Area 0.47 acres Time of Concentration 5.00 min Weighted Cpost 0.95 Allowable Release Rate 0 cfs TIME t(min)TIME t(sec) Intensity (in/hr)Qp(cfs)Vin (cu.ft)Vout (cu.ft) Storage cu.ft 5.00 300 4.25 1.90 763 0 763 5 300 4.25 1.90 763 0 763 10 600 2.95 1.32 925 0 925 15 900 2.40 1.07 1074 0 1074 20 1200 1.95 0.87 1134 0 1134 25 1500 1.75 0.78 1252 0 1252 30 1800 1.50 0.67 1274 0 1274 35 2100 1.35 0.60 1327 0 1327 40 2400 1.25 0.56 1396 0 1396 45 2700 1.20 0.54 1501 0 1501 50 3000 1.10 0.49 1524 0 1524 55 3300 1.00 0.45 1519 0 1519 60 3600 0.90 0.40 1488 0 1488 1524 Define Cpost Area Cpost sq.ft acres 1 Roads 0.95 20312 0.466 2 0.204 0 0.000 3 0.95 0 0.000 0.000 0.47 0.95Weighted C DATE:4/22/2022 INPUT NEEDED OUTPUTS Minimum Storage required Type Lawns Gravel total acres PROJECT : BASIN:ALL DESIGNER:DAVID ASSAN, PhD, PE. **RAINFALL INTENSITIES EXTRACTED FROM IDAHO TRANSPORTATION DEPARTMENT'S ROADWAY DESIGN MANUAL, APPENDIX B, ZONE G (AUG, 2013) BOWSTRING (MODIFIED RATIONAL) WORKSHEET Design Storm 100 year BODIFY PARKING EXPANSION Area 0.47 acres Time of Concentration 5.00 min Weighted Cpost 0.95 Allowable Release Rate 0 cfs TIME t(min)TIME t(sec) Intensity (in/hr)Qp(cfs)Vin (cu.ft)Vout (cu.ft) Storage cu.ft 5.00 300 5.90 2.63 1057 0 1057 5 300 5.90 2.63 1059 0 1059 10 600 4.10 1.83 1285 0 1285 15 900 3.25 1.45 1454 0 1454 20 1200 2.70 1.21 1570 0 1570 25 1500 2.25 1.00 1609 0 1609 30 1800 2.00 0.89 1698 0 1698 35 2100 1.80 0.80 1770 0 1770 40 2400 1.65 0.74 1843 0 1843 45 2700 1.55 0.69 1939 0 1939 50 3000 1.50 0.67 2078 0 2078 55 3300 1.40 0.63 2127 0 2127 60 3600 1.30 0.58 2149 0 2149 2149 Define Cpost Area Cpost sq.ft acres 1 Roads 0.95 20312 0.466 2 0.204 0 0.000 3 0.95 0 0.000 0.000 0.47 0.95Weighted C DATE:4/22/2022 INPUT NEEDED OUTPUTS Minimum Storage required Type Lawns Gravel total acres PROJECT : BASIN:ALL DESIGNER:DAVID ASSAN, PhD, PE. **RAINFALL INTENSITIES EXTRACTED FROM IDAHO TRANSPORTATION DEPARTMENT'S ROADWAY DESIGN MANUAL, APPENDIX B, ZONE G (AUG, 2013)