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6) East Diversion Ditch <br />` Drainage Area 40 acres <br />Ground Slope - 11% <br />Peak Flow = 38 cfs <br />Ditch also diverts discharge from No. (5) = 233 cfs <br />Total Required Flow: 33 + 38 = 71 cfs <br />Use same section as above <br />d = 2.2 ft. <br />q = 75 cfs <br />v = 1.8 fps <br />No riprap required. <br />Dig ditch 4.5 feet deep. <br />7) Collection Ditch Around Overburden Dump <br />• Drainage area 93.4 acres <br />Avg.. ditch slope 0.04 ft/ft <br />Peak Flow 89 cfs <br />Ditch Section <br />Bottom width 15' <br />Side slope 3:1 <br />n = 0.035 <br />q= 89 cfs <br />d = 0.8 ft <br />u = 6.6 fps <br />Riprap is required <br />Dig ditch 3 feet deep <br />C~ <br />