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• South Side - 160 Acres <br />Avg. ground slope 10$ <br />CN 90 <br />1.8" rainfall, 0.93" runoff <br />Peak Flow (South Side) 81 cfs <br />Use same section as for Haul Road Collection Ditch <br />Long. Slope = 0.1$ (0.001 ft/ft) <br />d=3 ft. <br />q = 104 cfs <br />v = 2.2 fps <br />No riprap required. <br />Ditch will be 4 feet deep. <br />3) Feeder Ditch into Pond <br />Peak Flow = 170 cfs (Peak for entire property) <br />Long. Slope = 33$ (0.33 ft/ft) <br />Ditch Section <br />12 'bottom <br />3:1 side slope <br />n = 0.035 <br />d = 0.8 ft. <br />q = 193 cfs <br />v = 18.0 fps <br />Riprap will be required. <br />Dig ditch 2.5 feet deep. <br />• 4) Highwall Ditch Built in 1979 <br />Drainage Area 58 acres <br />CN 80 <br />1.8" rainfall, 0.86" runoff <br />11$ slope <br />Peak Flow = 52 cfs <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) Highwall Ditch Built in 198] <br />Drainage Area 33 acres <br />Ground Slope -Assume 11$ <br />Peak Flow = 33 cfs <br />Use same ditch as No. (4) <br />C1 <br />