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HomeMy WebLinkAboutWS CAT, Stormwater Plan , Sheet (6) V1Page 4 221182 Project: Client: Designer: Description: Date: MAXIMUM RUNOFF AREA ALLOWABLE PER PIPE DIAMETER Qstorm = C*i*Aacres 1.49 0.464 n n Qstorm = C*i*Aacres Runoff Coefficient, C = 0.74 Manning's Coefficient, n = 0.011 Storm Event = 100 year Time of Concentration, tc = 5 minutes Rainfall Intensity, i = 3.81 in/hr Hydraulic Slope, S = 0.4 % Qpipe = Qstorm, solve for drainage area capacity based on pipe diameter Qpipe C*i Qpipe Apipe (sqft) (acres) 12 in 1.98 30568 0.70 12 in 15 in 3.06 47265 1.09 15 in 18 in 4.82 74418 1.71 18 in 21 in 6.50 100403 2.30 21 in 24 in 8.47 130859 3.00 24 in 30 in 15.36 237263 5.45 30 in PIPE SIZE DETERMINATION Basin/ Inlet Runoff Area Qpipe Vpipe (sf) (sf) (acres) (cfs) (fps) S 55,382 55,382 1.27 3.58 4.56 Cumulative Area Downstream Pipe Size (in) 12 in Upstream Basins Included Phone: 208.288.1992 - Fax: 208.288.1999 STORM DRAIN PIPE SIZING Truck Shop PL WS CAT Centanni Vpipe = Storm Pipe Qpipe = *Apipe*R2/3*S 1/2 = *D8/3*S1/2 Aacres = 131 S.W. 5TH Avenue, Suite A, Meridian, Idaho 83642 0.12 0.10 Pipe Dia., D (in) Qpipe (cfs) Serviceable Runoff Area Design Pipe Slope (%) 0.22 0.16 Pipe Dia., D (in) 0.15 0.10 TS 12/27/21 A-2021-0223