Laserfiche WebLink
Spillway Pond F <br />Determine flow characteristics down 10.3% Grade <br />Pond F Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />Depth <br />D <br />0.9 <br />Feet <br />Width <br />W <br />5 <br />Feet <br />Slope <br />S <br />0.103 <br />Express as Decimal <br />Mannings "N" <br />N <br />0.04 <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)A2 +D "2) ^0.5] <br />R= AREAIWETTED PERIMETER <br />V= (1.49/N) *(R ^.667) *(S ^.5) = <br />Q =AXV= <br />Q REQUIRED - Peak Discharge <br />Sediment Pond F <br />Riprap Sizing - Down Face of Embankment - Pond F <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 = 0.68 feet <br />6.12 FEET ^2 <br />9.02 FEET <br />0.68 <br />9.23 FT /SEC <br />56.47 CFS <br />55.59 CFS <br />8 inches Use 6" to 18" Rock <br />TR -81 App. B -8 10/13 <br />