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<br /> <br />SEDIMENT VOLUME -Pond J <br />Use the universal soil loss equation. <br />A=RKLSCP <br />R =rainfall factor 30.00 <br />K =soil erodibility factor -Work soil 0.37 <br />LS =combined length slope factor 600' - 10% 3.50 <br />C =cropping management factor -Figure 7 1.00 <br />P =erosion control practice factor 1.00 <br />A =sediment, tons/acre/year 38.85 <br />TWO YEAR SEDIMENT VOLUME -ACRE FEET 0.895 <br />28.85 ACRES - 115 #/CF <br />TOTAL REQUIRED SEDIMENT POND CAPACITY--AF 1.899 <br />PEAK FLOW CALCULATIONS <br />The following peak flow calculations were compiled with the computer program STORM <br />version 6.21. Details of the run-off calculations are shown on the following pages. <br />10-YR 25-YR <br />24 HR 24 HR <br />Event Event <br />Pond J Drainage 8.73 12.45 <br />Pond K Drainage 4.47 5.92 <br />Flow calculations for the site ditches and culverts are presented in following sections of this exhibit. <br />Spillway Pond J <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D 0.600 FEET <br />WIDTH W 5.000 FEET <br />Slope S 0.020 EXPRESS AS DECIMAL <br />Mannings "N" N 0.030 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2.000 SLOPE = X:1 <br />AREA=(W D)+(X`DZ)= <br />WETTED PERIMETER=(W)+2`[((X`D)Z+DZ)v2] <br />R=AREANVETTED PERIMETER <br />V=(1.49/N)*(R~)`(SvZp <br />Q=AXV= <br />Q REQUIRED -Peak Discharge <br />PR-07 <br />Exh-8 - 164 - <br />3.72 FeetZ <br />7.68 Feet <br />0.48 <br />4.33 FUSec <br />16.11 CFS <br />12.45 CFS <br /> 2/03 <br />