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i <br />1 <br />i <br />1 <br />1 <br />I <br />1 <br />TABLE D.9-1 (con't) <br />DIVERSION DESIGN <br />MINE PIT DIVERSIONS <br /> WEST PIT EAST PIT <br /> WEST DITCH EAST DITCH <br />Catchment (acres) 300 125 110 <br />Overland slope (%) 25 15 30 <br />Hydraulic length (ft) 9,800 5,700 4,000 <br />CN 70 70 70 <br />100-yr precip (inches) 2.90 2.90 2.90 <br />Calculated peak flow (cfs) 185 90 100 <br />DITCH SIZING (see Figure D.9-1, Tvae 4 Ditch <br />A (full) = 48 sq ft (min) <br />R (full) = 48/19.3 = 2.49 <br />S = .0025 {min) <br />n = 0.03 <br />Q = 219 cfs > 185 cfs (adequate) <br />D-63 <br />