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Riprap Sizing -Across top of Embankment <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 = 0.08 feet <br />0.94 inches Use Pit Run Material <br />Pond D Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />FEET <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />2.32 Feetz <br />6.79 Feet <br />0.34 <br />3.43 FdSec <br />8.0 CFS <br />7.5 CFS <br />0.65 inches Use Pit Run Material <br />Exh 8-19 <br />09106 <br />DEPTH D 0.4 <br />WIDTH W 5 <br />Slope S 0.02 <br />Mannings "N" N 0.03 <br />SIDE SLOPE X 2 <br />AREA=(Vy`D)+(X`DZ)= <br />WETTED PERIMETER=(W)+2'[((X'D)2+Dz)in) <br />R=AREANVETTED PERIMETER <br />V=(1.49/N)•(Rv3)•(S ~n)= <br />Q=AXV= <br />Q REQUIRED -Peak Discharge <br />Riprap Sizing -Across top of Embankment <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 = 0.05 feet <br />TR-44 <br />~ ~PR~t~~ <br />3~2%7 <br />