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• <br />Choose Base = 3 ft., Depth = 0.5 ft. <br />A = bd + zdZ = (3) (0.5) + (0.5)' = 2.25 ft' OK <br />(Area Trapezoidal Channel) <br />Check Velocity <br />V=1.49 R~"S"~ R=A/P A=3.25 ftZ <br /> <br />5. Spillway Channel <br />Trapezoidal Channel: Z = 3, n = 0.04, slope (S) = 0.025 <br />Permissible Velocity (Vo) = 4.0 fps <br />Minimum Channel Capacity = 7.5 cfs <br />Minimum Area = 7.5 cfs/4 fps <br />= 1.88 ftZ <br />n <br />P=b+2d 1+2Z <br />= 4.58 <br />C_J <br />V = 3.66 fps OK <br />R = 2.25/4.58 <br />R = 0.4913 <br />Channel Invert Elevation = 6,577 <br />@ d(Full) Elevation = 6,577.5 <br />See Exhibit G-3 for pond design details. <br />• <br />Revised May 1998 <br />