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C~ <br />Manning's Equation <br />Waste Pond Emergency Spillway <br />Flow In a Trapezoidal Channel <br /> <br />DEPTH D 0.68 FEET <br />WIDTH W 9.00 FEET <br />Slope S 0.02 EXPRESS AS DECIMAL <br />Mannings "N" N 0.03 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2.00 SLOPE = X:1 <br />AREA=(W*D)+(X*DZ)= <br />WETTED PERIMETER=(V1~+2*[((X*D)Z+Dx)in] <br />R=AREANVETTED PERIMETER <br />Q=Axv= <br />Q REQLTIItED -Peak Discharge <br />Sediment Pond B <br />Riprap Sizing -Across top of Embankment <br />7.04 FeetZ <br />12.04 Feet <br />0.59 <br />4.91 FUSec <br />34.61 CFS <br />34.64 CFS <br />D50 =Size of Riprap <br />Dso = ((v x s^.l~i~.s8))^2 <br />D50 =Diameter in feet <br />V =Velocity <br />S =Slope <br />• <br />D50 = 0.11 feet 1.33 inches <br />Peak flow depth is 0.68 feet. Spillway is designed with an <br />emergency spillway 2 feet deep. This leaves enough depth <br />for the required I foot of freeboazd. <br />None Required <br />20 <br />