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• Overburden Drewdowns <br />Sage Creek Side <br />T = 0.1776 ft2/day <br />t 275 days in (2008) <br />3 <br />D 7,509,711 gals/275 days = 27,308 gal/day = 79 gpm = 3,651 ft /day <br />S = is calculated to match a t of 275 days and a drawdown of 59 feet <br />2 <br />Pit area in water = 46.58 acres/5 pits = 405,805 ft <br />s = total potential head 59 feet <br />7. Area of equivalent well 7~ r2 = 405,805 ft2, r = 359 feet <br />2. Calculate u for 59 ft of drewdown <br />V(u) = 4 x'T~ x .7776 x 59 = .03607 u = 2.22 <br />3651 <br />• 3. Calculate S that will give 59 ft of drawdown in 275 days at a radius of 359 ft. <br />S= 4 x .7776 x 275 x 2.22 .0034 <br />359 x 359 <br />4. Calculate u for 1 ft. drawdoun <br />w(u) = 4 xTt x .1776 x 1 = .0006113 u = 5.54 <br />3651 <br />5. Calculate d(stence to 1 ft. drawtlown using S = .0034 <br />rt = (4 x .7776 x 275 x 5.54)7/2 = 564 ft to the 7 ft. drewdown contour <br />.0034 <br />6. Calculate u for 5 ft. drawdown <br />u(u) = 4 xiC x .7776 x 5 = .003 D56 u = 4.18 <br />3651 <br />7. Calculate distance to 5 ft. drawdown using S = .0034 <br />• rs = (4 x .1776 x 275 x 4.18)7/2 = 490 ft. to the S ft. drewdown contour <br />.0034 <br />Revised 03/07/95 <br />