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Ditch 6 -1% Chanel - Reclaimed Configuration <br />The following peak flow for Ditch 1 (1.0 %) was obtained from SedCad, page 14 -6 -134 <br />Location of Ditch 6 can be found on Exhibit 8C. <br />Flow <br />(cfs) <br />Ditch D6 5.4 <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH <br />D <br />0.63 <br />FEET <br />WIDTH <br />W <br />3 <br />FEET <br />Slope <br />S <br />0.01 <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)= 2.49 Feet2 <br />WETTED PERIMETER= (W) +2 *[((X *D)2 +D2)112] 5.27 Feet <br />R= AREANVETTED PERIMETER 0.47 <br />V= (1.49 /N) *(R2l)*(S" )= 2.26 Ft /Sec <br />Q =AXV= 5.61 CFS <br />Q REQUIRED - Peak Discharge 5.37 CFS <br />Riprap Sizing <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 />0.2 inches None Required <br />PR -5 14 -6 -140 (Rev. 05/12) <br />