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<br />Table G-3 (Continued) <br />• <br /> <br />5. Spillway Channel <br />Trapezoidal Channel: Z = 3, n = 0.04, Slope (S) = 0.025 <br />Permissible Velocity (Vp) = 4.0 fps <br />Minimum Channel Capacity = 7.5 cfs <br />Minimum Area = 7.5 cfs/4 fps <br />= 1.88 ft2 <br />Choose Base = 3 ft., Depth = 0.5 ft. <br />A = bd + zd2 = (3)(0.5)+(3)(0.5)2 = 2.25 ft2 OK <br />(Area Trapezoidal Channel) <br />Check Velocity <br />V = 1.49 R2/3 S1/2 R = A/P A = 3.25 ft2 <br />n <br />P = b + 2d 1+Z2 <br />= 4.58 <br />R = 2.25/4.58 <br />• V = 3.66 fps OK R = 0.4913 <br />Channel Invert Elevation = 6577 <br />@ d(Full) Elevation = 6577.5 <br />See Exhibit G-3 for pond design details. <br />• <br />G-9 <br />