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Channel Design East Ditch <br />• Use Manning's Equation <br />Q - ~K` D8/3 S1/2 <br />n) <br />Q = 2.6 cfs <br />K = 2.23 <br />D/b = <br />Side Slopes = 2.5H:1V <br />n = 0.035 <br />2.6 = 2 23 D8/3 0.0261/2 <br />\~~ <br />• S = 0.026 <br />D = 0.60 feet <br />V = 1.486 r2.3 s1.2 <br />n <br />_ 1.486 (0.28)2'3 (0.026)1.2 <br />V 0.035 <br />V = 2.92 ft/sec <br />Freeboard = 1.0 feet <br />• <br />r=A <br />P <br />A = 0.90 ft2 <br />P = 3.23 <br />r = 0.28 <br />-16- <br />