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page 2 SP-1 <br />L J <br />Vs = (156 Tons/Year)(2,000 lb/Ton) <br />0 lb/cu. ft. <br />= 3,900 cu, ft. x 3 = 11,700 cu.ft. <br />Runoff for the 10 year 24 hour event is .61 inches <br />Vw = (6.7 acres (.61 inches/12 inches/foot)(43.560 cu.ft./acre) <br />Vw = 14.840 cu. ft. <br />VT = VW + VS = 14,840 cu. ft. +11,700 cu. ft. <br />= 26,540 cu. ft. <br />• <br />An additional volume of 2,840 cu. ft. will be added for discharge of <br />water produced in the mine at 5 gals/min. This provides 3 days of <br />storage. <br />Total volume = 29,380 cu. ft. <br />The peak discharge for the 25 year, 24 hour event is 14.4 cfs. Using <br />the formula Q = CLH 1.5 <br />Bottom width - 6.0' <br />Side slopes - 1:1 <br />C - 3.5 <br />H - 1.0' <br />Q = (3.5)(6.0)(1.0) 1.5 = 21 cu.ft./sec. <br />• <br />