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• Overburden Dravdovns <br />Grassy Creek Side <br />2 <br />7 = .0207 ft /day <br />t = 272 days worst case time in va[er (1999) <br />0 = 456,749 gels/272 days = 1,679 gal/day = 1.17 gpm = 224 ft3/day <br />S = is calculated to match a t of 272 days and a dravdovn of 62 feet <br />Pit area in water = 32.07 acres/8 pits = 174,621 ft2 <br />s = total potential head = 62 feet <br />1. Area of equivalent veil ST r2 = 174,621 ft2, r = 236 feet <br />2. Celcuiete u for 62 ft of dravdovn <br />Y(u) = 4 xT1' x .0207 x 62 = .07200 u = 1.73 <br />224 <br />3. Calculate 5 that viLl give 62 ft of dravdovn in 272 days at a radius of 236 ft. <br />5= 4 x .0207 x 272 x 1.73 = .0007 <br />236 z 236 <br />4. Calculate u for 1 ft. dravdovn <br />v(u) = 4 x Ti x .0207 x 1 = .00116 u = 4.99 <br />224 <br />5. Celcuiete distance to 1 ft. dravdovn using S = .0007 <br />r1 = (4 x .0207 z 272 x 4.99)1/2 = 401 ft to the t ft, dravdovn contour <br />.0007 <br />6. Calculate u for 5 ft. dravdovn <br />Y(u) = 4 x Tt z .0207 x 5 = .005806 u = 3.65 <br />224 <br />7. Calculate distance to 5 ft. dravdovn using S = .0007 <br />• rs = (4 x .0207 x 272 x 3.65)1/2 = 343 fi, to the 5 ft. dravdovn contour <br />.0007 <br />Revised 03/01/95 <br />