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Spillway Pond J <br />Manning's Equation <br />Flow In a Trapezoidal Channel <br />• <br />Exh-8 - 165 - <br />08/07 <br />DEPTH D <br />WIDTH W <br />Slope S <br />Mannings "N" N <br />SIDE SLOPE X <br />AREA=(W"D)+(X'D`)= <br />WETTED PERIMETER=(W)+2"[(()CD)`+D`)"`] <br />R=AREA[WETTED PERIMETER <br />V=(1.49/N)"(R`-)"(S <br />Q=AXV= <br />Q REQUIRED - Peak Discharge <br />Spillway Pond J <br />Riprap Sizing - Across top of Embankment <br />Spillway Pond J <br />Determine flow velocity down 3h:1v embankment <br />0.960 <br />5.000 <br />0.020 <br />0.030 <br />2.000 <br />FEET <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />6.64 Feet` <br />9.29 Feet <br />0.71 <br />5.62 Ft/Sec <br />37.30 CFS <br />36.64 CFS <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 = 0.15 feet 1.7 inches <br /> Pond J Emergency Spillway <br /> Manning's Equation <br /> Flow In a Trapezoidal Channel <br />DEPTH D 0.510 <br />WIDTH W 5.000 <br />Slope S 0.330 <br />Mannings "N" N 0.040 <br />SIDE SLOPE X 2.000 <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=(1.49/N)"(R^.667)"(S^.5)= <br />Q=AXV= <br />Q REQUIRED - Peak Discharge <br />TR-049 <br />APPR6VW',b <br />6/y/v 9 <br />None Required <br />FEET <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />3.07 FEET^2 <br />7.28 FEET <br />0.42 <br />12.03 FT/SEC <br />36.94 CFS <br />36.64 CFS