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1.8" rainfall, 0.86" runoff <br />11~ slope <br />Peak Flow = 52 cf <br />Ditch Section <br />10' bottom <br />2:1 side slope -~ <br />n = 0.035 <br />Then <br />d = 2.0 ft. <br />q = 62 cfs <br />v = 1.7 fps <br />No riprap required. <br />Dig ditch 4 feet deep. <br />• 5) Highwal] Ditch Built in 1981 <br />Drainage Area 33 acres <br />Ground Slope -Assume 11~ <br />Peak Flow = 33 cfs <br />Use same ditch as No. (4) <br />Then <br />d = 1.5 ft. <br />q=37 cfs <br />v = 1.5 fps <br />No riprap required <br />Dig ditch 3.5 feet deep. <br />• <br />