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~j Darcy's equation can be used to estimate a likely overall rate of ground-water flow <br />expected to pass through the flooded mine workings. Darcy's equation is: <br />Q = KIA .where: <br />Q. = discharge <br />K = hydraulic conductivity <br />I = gradient, and <br />A = the cross-sectional area of the "aquifer" through <br />which water flows. <br />Based on flow tests in the American Tunnel (Section 5.4), the hydraulic conductivity <br />in unusually fractured areas is estimated at 0.15 feet/day. However, typical hydraulic <br />conductivity is expected to be more than an order of magnitude less. <br />Darcy's equation was applied to four scenarios in order to obtain a reasonable range <br />of values for the ground-water flow expected to pass through the flooded mine <br />workings (Table 7). Case 1 is considered the most likely, with an equilibrium water <br />level in the mine at F level and a southwest flow direction. Case 1 uses the maximum <br />~' width of stoped mine workings of 4560 feet. The resulting estimated rate of ground- <br />water flow through the flooded mine workings is approximately 70 gpm. Case 2 is <br />similar to Case 1 except it assumes the absolute maximum possible equilibrium water <br />~, level of 12,250 feet (land surface in Sunnyside Basin) and results in an estimated flow <br />of 200 gpm. The flow in cases 1 and 2 would be expected to discharge over a long <br />stretch of Cement Creek as discussed in Section 8.1. <br />aunnylwpltraei\2251\Mar1993.Rpt 52 <br />i <br />HMI SIR1011 HYDRO-SEARCH <br />