Laserfiche WebLink
Page 6c of 9 <br />Ditch 7 (Middle Segment) <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />Depth <br />D <br />0.28 <br />Feet <br />Width <br />W <br />5 <br />Feet <br />Slope <br />S <br />0.35 <br />Express as Decimal <br />Mannings "N" <br />N <br />0.035 <br />Express as Decimal <br />Side Slope <br />X <br />2 <br />Slope = X:1 <br />AREA= (W*D) +(X *D ^2)= <br />WETTED PERIMETER= (W) +2 *[((X *D) ^2 +D ^2)^0.5] <br />R= AREA/WETTED PERIMETER <br />=(1.49 /N) *(R ^.667) *(S ^.5) = <br />=AXV= <br />REQUIRED - Peak Discharge* <br />rme 6A, Tab 'Reclaimed Configuration ", Point B +C <br />Sizing - Ditch D -3 <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 />1.56 FEET ^2 <br />6.25 FEET <br />0.25 <br />9.97 FT /SEC <br />15.52 CFS <br />15.30 CFS <br />D50 = 1.21 feet 15 inches Use 15" Rock <br />Vol. 6A TR -54 08/12 <br />