Laserfiche WebLink
Ditch 1 -13% Chanel - Reclaimed Configuration <br />The following peak flow for Ditch 1 (13 %) 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 D <br />072 <br />FEET <br />WIDTH W <br />3 <br />FEET <br />Slope S <br />0.13 <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 />2.94 Feet2 <br />WETTED PERI METER= (W) +2 *[((X <br />*D)2 +D2)1/21 <br />5.60 Feet <br />R= AREANVETTED PERIMETER <br />0.52 <br />V= (1.49/N) *(Rv3) *(S'r2) _ <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 = 0.66 feet <br />8.74 Ft/Sec <br />25.67 CFS <br />24.58 CFS <br />8.0 inches 15" In -Place <br />PR -5 14 -6 -124 (Rev. 05/12) <br />