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• P =erosion control practice factor 1.00 <br />A =sediment, tons/acre/year 3.44 <br />Three Year Sediment Volume -Acre-Feet 0.02 <br />4.29 ACRES - 115 #(CF <br />Total Required Sediment Pond Capacity -Acre-Feet 0.29 <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 4.4 <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 />DEPT1-4 D 0.5 FEET <br />WIDTH W 10 FEET <br />Slope S 0.02 EXPRESS AS DECIMAL <br />Mannings "N" N 0.03 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2 SLOPE = X:1 <br />AREA=(W*D)+(X*D2)= 5.50 FeetZ <br />WETTED PERIMETER=(W)+2*[((X*D)2+DZ)'~J 12.24 Feet <br />R=AREANVETTED PERIMETER 0.45 <br />V=(1.49/N)*(Rv3)*(S~~2)= 4.12 FUSec <br />Q=AXV= 22.7 CFS <br />TR-43 Exh. 8-18 <br />/i PPRovE9 <br />9~N~a 6 <br />05-06 <br />