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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 />0.85 <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) ^2 +D^2)^0.5) <br />R= AREA/WETTED PERIMETER <br />V= (1.491N) *(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)17.58)) "2 <br />D50 = Diameter in feet <br />V = Velocity <br />S = Slope <br />D50 = 0.64 feet <br />5.70 FEET ^2 <br />8.80 FEET <br />0.65 <br />8.94 FT /SEC <br />50.93 CFS <br />50.22 CFS <br />8 inches Use 6" to 18" Rock <br />TR -76 App. B -8 11/12 <br />