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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 0.3 inches <br />None Required <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 />3.73 CFS <br />3.07 CFS <br />DEPTH <br />D <br />0.130 <br />FEET <br />WIDTH <br />W <br />2.000 <br />FEET <br />Slope <br />S <br />0.010 <br />EXPRESS AS DECIMAL <br />Mannings "N" <br />N <br />0.015 <br />EXPRESS AS DECIMAL <br />SIDE SLOPE <br />X <br />1.000 <br />SLOPE = X:1 <br />AREA= (W*D) +(X'D "2)= <br />0.28 FEET ^2 <br />WETTED PERIMETER= (%M +2*[((X'D) <br />"2 +D^2) ^0.5] <br />2.37 FEET <br />R= AREANVETTED PERIMETER <br />0.12 <br />V= (1.49/N)'(R^.667)'(S ".5)= 2.38 FT /SEC <br />Q =AXV= 0.66 CFS <br />Q REQUIRED - Peak Discharge 0.60 CFS <br />TR -84 Volume XI, App. B -9 12/13 <br />