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Ditch 1 - 2% Chanel - Reclaimed Configuration <br />IThe following peak flow for Ditch 1 (2 %) was obtained from SedCad, page 14 -6 -121 <br />Location of Ditch 1 can be found on Exhibit 8C. <br />Flow <br />(cfs) <br />Ditch D1 24.6 <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH <br />D <br />1.2 <br />FEET <br />WIDTH <br />W <br />3 <br />FEET <br />Slope <br />S <br />0.02 <br />EXPRESS AS DECIMAL <br />Mannings "N" <br />N <br />0.04 <br />EXPRESS AS DECIMAL <br />SIDE SLOPE <br />X <br />1.5 <br />SLOPE = X:1 <br />AREA= (W *D) +(X *D2)= 5.76 Feet' <br />WETTED PERIMETER= (W) +2 *[((X *D)2 +D2)112] 7.33 Feet <br />R= AREA/WETTED PERIMETER 0.79 <br />V= (1.49 /N) *(R2J3) *(S1")= 4.49 Ft/Sec <br />Q =AXV= 25.85 CFS <br />Q REQUIRED - Peak Discharge 24.58 CFS <br />Riprap Sizing <br />D50 = Size of Riprap <br />D50 = ((V X S ^.17)17.58)) ^2 <br />D50 = Diameter in feet <br />V = Velocity <br />S =Slope <br />D50 = 0.09 feet <br />1.1 inches 9" In -Place <br />PR -5 14 -6 -123 (Rev. 05/12) <br />