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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 rip rap 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 />