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~a DITCH R-12 <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D 0.73 FEET <br />WIDTH W 12 FEET <br />Slope S 0.05 EXPRESS AS DECIMAL <br />Mannings "N" N 0.04 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2 SLOPE = X:1 <br />AREA=(W*D)+(X*DZ)= <br />WETTED PERIMETER=(W)+2*[((X•D)2+Dz)~rz~ <br />R=AREANVETTED PERIMETER <br />V=(1.49/N)*(R73)"(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 = 0.24 feet 2.9 inches <br /> <br />9.83 Feet2 <br />15.26 Feet <br />0.64 <br />6.21 Ft/Sec <br />61.01 CFS <br />60.67 CFS <br />TR-16 87 05/08 <br />