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East Diversion Ditch - 30% Channel Segment <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />Depth D 0.6 Feet <br />Width W 3 Feet* <br />Slope S 0.3 Express as Decimal <br />Mannings "N" N 0.04 Express as Decimal <br />Side Slope X 0.5 Slope = X:1 <br />AREA=(W*D)+(X*D"2)= 1.98 FEET "2 <br />WETTED PERIMETER=(W)+2*[((X*D)"2+D^2)^0.5] 4.34 FEET <br />R=AREA/WETTED PERIMETER 0.46 <br />IV=(1.49/N)*(R^.667)*(S^.5)= <br />IQ=AXV= <br />IQ REQUIRED - Peak Discharge <br />IRiprap Sizing - Ditch D-3 <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 = 1.47 feet <br />* Minimum Bottom Width <br />11.47 FT/SEC <br />22.71 CFS <br />21.75 CFS <br />18 inches Use 18" Rock <br />TR -91 App. B -60i 01/15 <br />