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Drawdown and dewatering from Marinelli and Niccoli(2000) <br /> Ho= 15 saturated thickness above pit base at radial distance Ro from pit center(feet) <br /> Hp= 2 saturated thickness above pit base at pit wall, Rp(feet) <br /> W= 0.001934 distributed recharge flux(feet/day) <br /> K= 30 horizontal hydraulic conductivity(feet/day) <br /> Ro= 2090 radial distance from pit center(feet) <br /> Rp= 600 radial distance to pit wall(feet) <br /> Irwin/Thomas Mine Drawdown <br /> Ho= 15.04033 by iteration <br /> um) 18 <br /> Pit inflow m <br /> Q= 24338 cf/day Y 16 <br /> 126 gpm t 14 <br /> 12 <br /> Ro from pit Ho -0 <br /> 2400 1800 15 LL 8 <br /> 2090 1490 15 `6 <br /> 2090 1490 15.04033 E 4 <br /> 2090 1490 15.04033 <br /> 2090 1490 15.04033 5 2 <br /> 2090 1490 15.04033 a 0 <br /> 2090 1490 15.04033 0 500 1,000 1,500 2,000 <br /> 2090 1490 15.04033 Distance from Edge of Pit(feet) <br /> 2060 1460 15.03839 <br /> 2010 1410 15.02642 <br /> 1960 1360 15.00328 <br /> 1910 1310 14.96859 W= assume 15.1 in/yr precip @ 20%and 10.9 in/yr irrigation <br /> 1860 1260 14.92197 @ 50%(26 in/yr ave grass pasture requirement minus <br /> 1810 1210 14.86293 precip and 50%percolation from irrigation) <br /> 1760 1160 14.79095 <br /> 1710 1110 14.70541 <br /> 1660 1060 14.60562 <br /> 1610 1010 14.49077 <br /> 1560 960 14.35994 <br /> 1510 910 14.21207 <br /> 1460 860 14.04592 <br /> 1410 810 13.86006 <br /> 1360 760 13.6528 <br /> 1310 710 13.42218 <br /> 1260 660 13.16583 <br /> 1210 610 12.88094 <br /> 1160 560 12.56406 <br /> 1110 510 12.21097 <br /> 1060 460 11.81639 <br /> 1010 410 11.37357 <br /> 960 360 10.87368 <br /> 910 310 10.30484 <br /> 860 260 9.650398 <br /> 810 210 8.885723 <br /> 760 160 7.971568 <br /> 710 110 6.837633 <br /> 660 60 5.329123 <br /> 610 10 2.874737 <br />