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Determine flow characteristics down 90.3% Grade <br />Pond F Emergency Spillway <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />Depth <br />D <br />0.8 <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 PER IMETER=(W)+2'[((X"D)^2+D^2)^0.5] <br />R=AREA/WETTED PERIMETER <br />V=(1.49/N)`(RA.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 = 0.61 feet <br />5.36 FEET ^2 <br />862 FEET <br />0.62 <br />8.71 FT/SEC <br />46.70 CFS <br />46.48 CFS <br />7 inches Use 6" to 18" Rock <br />TR -113 App. B-8 06/30/17 <br />