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• SEDIMENT VOLUME -Pond K <br />A =sediment, tons/acre/year <br />A=RKLSCP <br />R =rainfall factor <br />K =soil erodibility factor -Work soil <br />LS =combined length slope factor 1200' - 4% <br />C =cropping management factor <br />P =erosion control practice factor <br />THREE YEAR SEDIMENT VOLUME -ACRE FEET <br />7.56 ACRES - 115 #!CF <br />TOTAL REQUIRED SEDIMENT POND CAPACITY-AF <br />Pond K Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D 0.600 <br />WIDTH W 2.000 <br />Slope S 0.020 <br />Mannings "N" N 0.030 <br />SIDE SLOPE X 2.000 <br />• AREA=(W'D)+(X'D^2)= <br />WETTED PERIMETER=(W)+2'[((X'D)^2+D^2)^0.5] <br />R=AREANVETTED PERIMETER <br />Q=AXV= <br />Q REQUIRED -Peak Discharge <br />Riprap Sizing -Across top of Embankment -Pond K <br />D50 =Size of Riprap <br />D50 = ((V X S^.17N7.58))^2 <br />D50 = Diameter in feet <br />V =Velocity <br />S =Slope <br />D50 = <br />0.07 feet <br />FEET <br />FEE7 <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />1.92 FEET^2 <br />4.68 FEET <br />0.41 <br />3.88 FT/SEC <br />7.44 CFS <br />5.92 CFS <br />0.8 inches None Required <br />30.00 <br />0.37 <br />1.00 <br />1.00 <br />1.00 <br />11.10 <br />0.101 <br />0.486 <br />TR-045 Exh-8 - 168 • 12/06 <br />APPRovE~ <br />7/ 3~0 "7 <br />