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<br />D = Qn•375 <br />KS1/2 <br />D = 0.67 feet <br />b = 3.35 feet <br />Freeboard = 1.5 feet <br />V = 1.49 R 2/3 S 1/2 <br />n <br />JOHNSON DIVERSION #3A <br />MINIMUM DITCH CONFIGURATION <br />where: D = Flow depth <br />Q = Peak flow (cfs) = 15.7 <br />n = roughness factor = .035 <br />s = ditch avg slope = 3.SX <br />K = discharge factor = 8.5 <br />D/b = .20 <br />Slide slopes = 2H:1V <br />Peak flow velocity = 4.97 fps <br />JMM/jb <br />8/21/85 <br />