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Spillway Pond J <br />Mannings Equation <br />Flow In a Trapezoidal Channel <br />u <br />DEPTH D <br />WIDTH W <br />Slope 5 <br />Mannings "N" N <br />SIDE SLOPE X <br />AREA=(W'D)+(X`D`)= <br />WETTED PERIMETER=(W)+2'[((X`D)`+D`)"`] <br />R=AREA/WETTED PERIMETER <br />V=(1.49/N)'(R"")'(S "`)_ <br />O=AXV= <br />O REQUIRED -Peak Discharge <br />Spillway Pond J <br />Riprap Sizing -Across top of Embankment <br />0.930 <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 />6.38 Feet` <br />9.16 Feet <br />0.70 <br />5.52 FUSec <br />35.21 CFS <br />35.02 CFS <br />D50 =Size of Riprap <br />D50 = ((V X S^.17y7.58))^2 <br />D50 = Diameter in feet <br />V =Velocity <br />S =Slope <br />D50 = 0.14 feet 1.7 inches <br />Spillway Pond J <br />Determine flow velocity down 3h:1v embankment <br /> Pond J Emergency Spillway <br /> Mannings Equation <br /> Flow In a Trapezoidal Channel <br />DEPTH D 0.500 <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=AREAIWETTED PERIMETER <br />V=(1.49/N)'(R^.667)'(S^.5)= <br />O=AXV= <br />O REQUIRED-Peak Discharge <br />TR-045 <br />APfRat~O <br />>~3/0"~ <br />Exh-8 - 165 - <br />3.00 FEET^2 <br />7.24 FEET <br />0.41 <br />11.90 FT/SEC <br />35.69 CFS <br />35.02 CFS <br />12/06 <br />None Required <br />FEET <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:1 <br />