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~~} DITCH R-3 <br />Mannings Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D 0.82 FEET <br />WIDTH W 3.5 FEET <br />Slope S 0.25 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*D2)= <br />WETTED PERIMETER=(W)+2*[((X*D)2+Dz)u2) <br />R=AREA/WETTED PERIMETER <br />V=(1.49/N)*(Rv3)*(S'"~)= <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 = 1.86 feet 22.3 inches <br />DITCH R-4 <br />Mannings Equation <br />Flow In a Trapezoidal Channel <br />4.21 Feet2 <br />7.17 Feet <br />0.59 <br />13.07 Ft/Sec <br />55.10 CFS <br />54.08 CFS <br />DEPTH D 0.71 FEET <br />WIDTH W 2 FEET <br />Slope S 0.25 EXPRESS AS DECIMAL <br />_ Mannings "N" N 0.04 EXPRESS AS DECIMAL <br />SIDE SLOPE X 2 SLOPE = X:1 <br />TR-16 82 05/08 <br />