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Riprap Sizing - Drainage Ditch D -H1 1% Slope Reach <br />D50 = Size of Riprap <br />D50 = ((V X SA 17)/7.58))A2 <br />D50 = Diameter in feet <br />V = Velocity <br />S = Slope <br />D50 = 0 02 feet <br />None Requirec <br />OPERATIONS CONFIGURATION <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 Channe <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*DA2)= <br />028 FEET A2 <br />WETTED PERIMETER=(W)+21((X*D)A2+DA2)A0 <br />5] <br />2 37 FEET <br />R=AREA/WETTED PERIMETER <br />012 <br />V=(1 49/N)*(RA.667)*(SA.5)= 2 38 FT/SEC <br />Q=AXV= 066 CFS <br />Q REQUIRED - Peak Discharge 0.60 CFS <br />TR -105 Volume XI, App. B-8 09/15 <br />