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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 = 0.08 feet <br />4.4 CFS <br />0.94 inches Use Pit Run Material <br />Pond D Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br /> <br />DEPTH D 0.4 FEET <br />WIDTH W 5 FEET <br />Slope S 0.02 EXPRESS AS DECIMAL <br />Mannings "N" N 0.03 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2 SLOPE = X:1 <br />AREA=(W*D)+(X*DZ)= <br />WETTED PERIMETER=(W)+2*[((X*D)Z+p2)'~] <br />R=AREANVETTED PERIMETER <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 /> <br />2.32 Feet2 <br />6.79 Feet <br />0.34 <br />3.43 FUSec <br />8.0 CFS <br />4.4 CFS <br />0.65 inches Use Pit Run Material <br />Exh. 8-19 <br />05-06 <br />TR-43 <br />A PPRovED <br />q~ii~o 6 <br />