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Riprap Sizing -Across 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 = 0.09 feet <br />1.1 inches None Required <br />Embankment Spillway Design (into McClane Creek) <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D 0.33 FEET <br />WIDTH W 8 FEET <br />Slope S 0.65 EXPRESS AS DECIMAL <br />Mannings "N" N 0.04 EXPRESS AS DECIMAL <br />SIDE SLOPE X 1.5 SLOPE = X:1 <br />AREA=(W*D)+(X*DZ)= <br />WETTED PERIMETER=(W)+2*[((X*D)2+Dz)~n] <br />R=AREANVETTED PERIMETER <br />2.80 Feet2 <br />9.19 Feet <br />0.31 <br />V=(1.49/N)*(R~) *(S ~ n )_ <br />Q=AXV= <br />Q REQUIRED -Peak Discharge <br />Riprap Sizing -Across 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 = 2.78 feet <br />13.61 FUSec <br />38.15 CFS <br />38.10 CFS <br />33.4 inches Use 36" <br />TR-16 16 05/08 <br />