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Disturbed -Fair 0.24 81 1.8 0.48 <br />0.01 <br />TOTAL 2.65 <br />0.10 <br />TOTAL REQUIRED WATER VOLUME - - A -F <br />0.10 <br />SEDIMENT VOLUME - Pond D <br />0.03 <br />Use the universal soil loss equation. <br />2 <br />A= RKLSCP <br />R = rainfall factor <br />30.00 <br />K = soil erodibility factor <br />0.37 <br />LS = combined length slope factor 400'- 2% <br />0.31 <br />Use Ditch D1 Length & Slope <br />C = cropping management factor <br />1.00 <br />P = erosion control practice factor <br />1.00 <br />A = sediment, tons /acre /year <br />3.44 <br />Three Year Sediment Volume - Acre -Feet <br />0.01 <br />2.65 ACRES -115 # /CF <br />Total Required Sediment Pond Capacity - Acre -Feet <br />0.11 <br />Peak Flow Calculations <br />The following peak flow calculations were compiled with SEDCAD. <br />Details of the run -off calculations are shown on the following pages. <br />25 -YR <br />24 HR <br />Event <br />Pond D Drainage 1.2 <br />Flow calculations for the site ditches and culverts are <br />presented in following sections of this exhibit. <br />Spillway Pond D <br />Pond D Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D <br />0.1 <br />WIDTH W <br />10 <br />Slope S <br />0.02 <br />Mannings "N" N <br />0.03 <br />SIDE SLOPE X <br />2 <br />AREA= (W *D) +(X *D2)= <br />WETTED PERIMETER= (W) +2 *[((X *D)2 +D2)112] <br />R= AREA/WETTED PERIMETER <br />FEET <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />1.02 Feet2 <br />10.45 Feet <br />0.10 <br />TR -76 Exh. 8 -18 12/12 <br />