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SEDIMENT VOLUME - Pond 8 <br />Use the universal soil loss equation. <br />A=RKLSCP <br />R = rainfall factor <br />20.00 <br />K = soil erodibility factor <br />0.25 <br />LS = combined length slope factor <br />3.50 <br />Used 10%, 700'(E2 -E2) <br />FEET <br />C = cropping management factor <br />0.30 <br />P = erosion control practice factor <br />1.00 <br />A = sediment, tons/acre/year 5.25 <br />Three Year Sediment Volume - Acre -Feet 0.22 <br />34.96 ACRES - 115 #/CF <br />Total Required Sediment Pond Capacity -Acre-Feet 0.90 <br />PEAK FLOW CALCULATIONS <br />The following peak flow calculations were compiled with the computer program SEDCAD <br />version 4.0. Details of the runoff calculations are shown on the following pages. <br />Pond 8 Drainage <br />Spillway Pond 8 <br />10 -YR <br />25 -YR <br />24 HR <br />24 HR <br />Event <br />Event <br />6.04 11.55 <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH <br />D <br />0.25 <br />FEET <br />WIDTH <br />W <br />20 <br />FEET <br />Slope <br />S <br />0.02 <br />EXPRESS AS DECIMAL <br />Mannings "N" <br />N <br />0.03 <br />EXPRESS AS DECIMAL <br />SIDE SLOPE <br />X <br />5 <br />SLOPE = X:1 <br />SCC <br />RSS-2 <br />07/06 <br />