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Drawdown and dewatenng from Marinelli and Niccoli (2000) <br />h = <br />23 <br />saturated thickness above pit base at radial distance Ro from pit center (feet) <br />hp = <br />2 <br />saturated thickness above pit base at pit wall, Rp (feet) <br />W = <br />0.002831 <br />distributed recharge flux (feet/day) <br />Kh = <br />480 <br />horizontal hydraulic conductivity (feet/day) <br />r, <br />1 <br />radial distance from pit center (feet) <br />rp = <br />1200 <br />radial distance to pit wall (feet) <br />h = <br />22.98887 by iteration <br />Pit inflow <br />Q = <br />550452 cf /day <br />2859 gpm - - - -- -, <br />r <br />r from pit <br />h w 25 -- - - - -- - - - - - <br />N <br />8000 <br />6800 <br />23 <br />3 <br />.2 20 <br />- - - - -- -- <br />8 960 <br />6760 <br />22.98887 <br />7800 <br />6600 <br />22.98557 'a <br />7600 <br />6400 <br />22.97198 R <br />7400 <br />6200 <br />22.94761 <br />7200 <br />6000 <br />22.91211 N 10 <br />-- - - - - - - <br />7000 <br />5800 <br />2286509 E <br />6800 <br />5600 <br />2280611 <br />5 5 <br />- -- - - - <br />6600 <br />5400 <br />22.83468 <br />6400 <br />5200 <br />22.65024 <br />Q 0 <br />_�_ - -- <br />6200 <br />5000 <br />22.55217 <br />0 2,000 4,000 6,000 8,000 <br />6000 <br />4800 <br />22.43974 <br />5800 <br />4600 <br />22.31216 Distance from Edge of Pit (feet) <br />5600 <br />4400 <br />22.1685 <br />5400 <br />4200 <br />22.00771 <br />5200 <br />4000 <br />21.82859 <br />5000 <br />3800 <br />21.62975 W = assume 12 in /yr precip @ 20% and 20 in /yr irrigation <br />4800 <br />3600 <br />21.40959 @ 50% (32 in /yr ave hay /com requirement minus <br />4600 <br />3400 <br />21.16625 precip and 50% percolation from furrow irrigation) <br />4400 <br />3200 <br />20.89752 <br />4200 <br />3000 <br />2060082 <br />4000 <br />2800 <br />20.27305 <br />3800 <br />2600 <br />19.91051 <br />3600 <br />2400 <br />19.50866 <br />3400 <br />2200 <br />19.06189 <br />3200 <br />2000 <br />18.5632 <br />3000 <br />1800 <br />18.00363 <br />2800 <br />1600 <br />17.37148 <br />2600 <br />1400 <br />16.65108 <br />2400 <br />1200 <br />15.82071 <br />2200 <br />1000 <br />14.84895 <br />2000 <br />800 <br />13.68759 <br />1800 <br />600 <br />12.25632 <br />1600 <br />400 <br />10.40222 <br />1400 <br />200 <br />7750733 <br />