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Ditch 5 -1.5% Chanel - Reclaimed Configuration <br />The following peak flow for Ditch 5 (1.5 %) 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 18.3 <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D <br />1.1 <br />FEET <br />WIDTH W <br />3 <br />FEET <br />Slope S <br />0.015 <br />EXPRESS AS DECIMAL <br />Mannings "N" N <br />0.04 <br />EXPRESS AS DECIMAL <br />SIDE SLOPE X <br />1.5 <br />SLOPE = X:1 <br />AREA= (W *D) +(X *D2)= <br />5.12 Feet2 <br />WETTED PERIMETER= (W) +2 *[((X <br />*D)2 +D2)112] <br />6.97 Feet <br />R= AREANVETTED PERIMETER <br />0.73 <br />V= (1.49 /N) *(R") *(S112)= <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 = 0.06 feet <br />3.71 Ft/Sec <br />18.99 CFS <br />18.29 CFS <br />0.7 inches None Required <br />PR -5 14 -6 -137 (Rev. 05/12) <br />