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Ditch 5 - 3% Chanel - Reclaimed Configuration <br />The following peak flow for Ditch 5 (3 %) was obtained from SedCad, page 14 -6 -134 <br />Location of Ditch 5 can be found on Exhibit 8C. <br />Flow <br />(cfs) <br />Ditch D5 3.1 <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH <br />D <br />0.35 <br />FEET <br />WIDTH <br />W <br />3 <br />FEET <br />Slope <br />S <br />0.03 <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)= <br />WETTED PER] METER= (W) +2 *[((X *D)2 +D2)1/2j <br />R= AREA/WETTED PERIMETER <br />V= (1.49/N)* (R2j)*(S 112) = <br />Q =AXV= <br />Q REQUIRED - Peak Discharge <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 = 0.04 feet <br />1.23 Feet2 <br />4.26 Feet <br />0.29 <br />2.82 Ft/Sec <br />3.48 CFS <br />3.05 CFS <br />0.5 inches None Required <br />PR -5 14 -6 -138 (Rev. 05/12) <br />