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~i <br />\J <br />• <br />Haul Road 7f I Embankment <br />Drainage Area = 632 acres (see Exhibit 7-7, Surface Hydrology Map). <br />Hyd. <br />Soi I <br />Soil Type % of Area Grou <br />66F Skylick looms (5-60% slope) <br />66E Skylick looms (5-60% slope) 50 C <br />66D Skylick looms (5-60% slope) <br />X8D Winevada-Spiitro loam 40 B <br />99 Cryoboroll (Hesperus)/Rockland Ass. 10 B <br />Vegetation -Mixed Brush <br />Approximately 50% of the area has 75% cover <br />Approximately 50% of the area has 30% cover <br />CN <br />88 <br />68 <br />68 <br />Weighed CN = 78 pg. 58 SCS Table E-3; I% <br />PIO = 1.6iinches, Runoff Volume = 0.25 inches; Ponding Factor10 = .86 <br />P25 = 1.95 inches, Runoff Volume = 0.45 inches; Ponding Factor2S = ,87 <br />PI00 = 2.4iinches, Runoff Volume = 0.72iinches; Ponding Factor100 = •90 <br />Average Slope <br />Low point = 6907 High point = 8100 Z = 1193 feet <br />25% Z = 298 or 7205 50% Z = 596 or 7503 75% Z = 895 or 7807 <br />S _ 0.25 (I 193) (4150 + 7 150+ l,lr 250) = 0.24 or 24% <br />27,5 9,9 <br />Vw 10 = 632 acres x 0.28 inches x I ft. x 0.86 = 12.7 acre-feet <br />12 in. <br />Vw25 = 632 acres x 0.45~inches x I ft. x 0.87 = 20.6 acre-feet <br />12 in. <br />Vw100 = 632 acres x 0.72 inches I ft. x 0.90 = 34.1 acre-feet <br />12 in. <br />12-1-1 <br />