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Q =AXV= <br />Q REQUIRED - Peak Discharge <br />Riprap Sizing - Drainage Ditch D -H1 1% Slope Reach <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 = 0.02 feet <br />None Required <br />0.3 inches <br />Concrete Ditch <br />Flow From 1 -1 and J 4 - 10 Year Event <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D 0130 <br />WIDTH W 2.000 <br />Slope S 0.010 <br />Mannings "N" N 0.015 <br />SIDE SLOPE X 1.000 <br />AREA= (W`D) +(X'D "2)= <br />WETTED PERIMETER= (W) +2'[((X'D) ^2 +D "2) ^0.5] <br />R= AREAANETTED PERIMETER <br />V= (1.49/N)'(R ^.667 )' (S ^. 5) _ <br />Q =AXV= <br />Q REQUIRED - Peak Discharge <br />3.73 CFS. <br />3.07 CFS <br />FEET <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />0.28 FEET ^2 <br />2.37 FEET <br />0.12 <br />2.38 FT /SEC <br />0.66 CFS <br />0.60 CFS <br />TR -84 Volume XI, App. B -9 12/13 <br />