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9 CROSS-SLOPE BERM DESI April 18, 2003 Worksheet No. 2 of 3 <br /> CALCULATION OF PEAK FLOW IN CROSS-SLOPE BERM <br /> Design for a 15 min., 100-year storm <br /> Procedure: Calculate the peak runoff rate using the Rational Method. <br /> Peak runoff rate (Qp)= peak flow in cross-slope berm <br /> Peak Runoff Rate (Qp): <br /> Rational Formula: QP = CIA <br /> QP = Peak Runoff Rate <br /> C = Runoff Coefficient 1 acre-inch - 1.008 ft3 <br /> 1 = Rainfall Intensity (in/hr) hr sec <br /> A= Contributory Area (acres) Therefore, no conversion factor is necessary. <br /> C = 0.4 (Source: Ametican Society of Civil Engineers <br /> 1 = 2.43 (Source: San Joaquin County Hydrology Manual, Table B.13) <br /> A= 2.10 ( Use largest contributory area for peak flow, Area IV) <br /> QP = (0.4)`'(2.43)*(2.10) <br /> QP = 2.04 cfs <br /> BERM DESIGN: <br /> 3d d <br /> 91 dl <br /> N:\1 North County\NCDrainDesign.xls <br /> Sheet: DrainageDesign Printed:6/18/03 <br />