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i <br />• <br />Determine [low velocity down 3h:1 v embankment <br /> Pond B Emergency Spillway <br />' Manning's Equation <br /> Flow In a Trapezoidal Channel <br /> DEPTH D 0.30 FEET <br /> WIDTH W 10.0 FEET <br /> Slope S 0.33 EXPRESS AS DECIMAL <br /> Mannings "N" N 0.04 EXPRESS AS DECIMAL <br /> SIDE SLOPE X 2.0 SLOPE = X:1 <br /> AREA=(WD)+(X•D^2)= 3.18 FEET^2 <br /> WETTED PERIMETER=(lV)+2•[((X•D)^2+D^2)^0.5] 11.34 FEET <br /> R=AREA/WETTED PERIMETER 0.28 <br /> V=(1.49/N)•(R^.667)•(5^.5)= 9.17 FT(SEC <br /> Q=AXV= 29.15 CFS <br /> Q REQUIRED -Peak Discharge 21.64 CFS <br /> <br /> Sediment Pond B <br /> Riprap Sizing -Down Face of Embankment -Pond B <br />• <br />D50 =Size of Riprap <br />D50 = ((V X S^.17)!7.58))^2 <br />D50 =Diameter in feet <br />V =Velocity <br />S =Slope <br />D50 = 1.0-feet 12-inches <br />PR-03 EXH-8 -9 - 5/99 <br />