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Channel Design Ditch No. 1 <br />• <br />Use Manning's Equation <br />K DS/3 S1/2 <br />Q = <br />n <br />Q = 872 cfs <br />K = 8.97 <br />D/b = .2 <br />Side Slopes = 2.5 H:1V <br />n = .025 <br />872 = 8.97 D8/3 (S)1/2 <br />.025 <br />Segment 1 <br />• S1 = 11.5% <br />D = 2.09' <br />b = 10.46' <br />1.486 r2/3 sl/2 <br />V = <br />n <br />V = 1.486 (1.32) (.115)1/2 <br />.025 <br />V = 26.5 ft/sec <br />• <br />r = A <br />P <br />A = 32.78 ft2 <br />P = 21.71 <br />r = 1.51 <br />-3- <br />