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Channel Design Ditch No. 3 <br />Use Manning's Equation <br />K D8/3 S1/2 <br />Q = <br />n <br />Q = 2.6 cfs <br />K = 2.23 <br />D/b = ("V" Ditch) <br />Side Slopes = 2.5H:1V <br />n = .025 <br />32 = 2.23 D8/3 (S)1/2 <br />.025 <br />S = 2.6% <br />D = 0.53' <br />b = 0.0' <br />1.486 r2/3 (.026)1/2 <br />V = .025 <br />A <br />r=P <br />A = 0.70 ft.2 <br />P = 2.85 <br />r = 0.25 <br /> <br />Vmax = 0.8 ft/sec <br />-16- <br />