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Yedge Loel Drawdouns <br />Grsssy Creek Side <br />T = .0135 ft2/day <br />t = 200 days worst case time in welter (1999) <br />g = 199,565 gals/200 days 998 gel/day = 0.693 gpm = 133 ft3/day <br />5 = is calculated to match e t of 200 days and a drewdown of 82 feet <br />Pit area in water = 23.58 acres/8 pits = 128,393 ft2 <br />s = total potential heed 82 feet <br />1. Area of equivalent well nr2 = 128,393 ft2, r = 202 feet <br />2. Calculate u for 82 ft of drawdown <br />Y(u) = 4 xTf x .0135 x 82 = .1046 u = 1.47 <br />133 <br />3. Calculate S that will give 82 ft of drawdown in 200 days at a radius of 202 ft. • <br />S= 4 z .0135 x 200 x 1.47 = .00039 <br />202 x 202 <br />4. Calculate u for 1 f[. drawdown <br />Y(u) = 4 x iT x .0135 z 1 = .001276 u = 4.91 <br />133 <br />5. Calculate distance to 1 ft. drawdown using S = .00039 <br />r1 = f4 x .0135 x 200 x 4.91)1/2 = 369 ft to the 1 ft. drawdown contour <br />.00039 <br />b. Calculate u for 5 ft. drewdown <br />Y(u) = 4 xTT z .0135 x 5 = .006378 u = 3.57 <br />133 <br />7. Calculate distance to 5 ft. drewdoun using S = .00039 <br />r5 (4 x .0135 x 200 x 3.57)1/2 = 314 ft. to the 5 ft. drawdown contour • <br />.00039 <br />Revised 03/01/95 <br />