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U <br />10. Fluxes through the ends and bottom of the pit are insignificant and net accounted for <br />fn the program. <br />il. The aquifer is homogeneous, isotropic, and fnftnite in extant. <br />12. The transmi ssi vi ty value for a pit Ss set equal to the product of the saturated depth <br />of pit and the average hydraulic Conductivity. <br />73. The number of pits mined per year must be a whale number, with the number of days all <br />pits ere open for a year being less than or equal to 365 days (t.e., 1 pit open for <br />365 days, 2 pt to open 182 days each, 3 pits open 121 days each, etc.). - <br />The overburden pit Snflow values were caieul ated using unconfined ground water flaw <br />equati one and the Oakota coal pSt inflow values wore cal CUlated using confined aquati ohs. <br />Pit inflow calculations are based on the following procedures developed by McWhorter <br />(1962). Equa ttons 1 and 2 describe one-dSloenaional unconfined and confinetl flow. <br />• 1} d f dh~ dh O~x~ Lu <br />K dx h dx Sys dt <br />2) T d?h ` S dH W ~ x` Lc + Lu <br />dx2 dt <br />where: <br />K is the hydraulic conductivity, Vt; <br />7 is the transmTasi vity, L2/t; <br />Sya is the specific yi old, dinensi onlass; <br />5 is the confined storage coefffci ent, di menai onl vas; <br />h is the hoed in the conf7ned zone, L; <br />H 1a the pressure Mad above the eonff ninq unit Sn the confined zone, L; <br />x fa the location in Cartesian coordinate apace, L; <br />t is tine, t; <br />Lu is the distance to the uneonf inad-coot fined zone interface, L; and <br />Le is the dtstanee from the unconti had-confined interface to the ands sturbed zone, L. <br />Integrating equations l and 2 with rospect to x over the intervals in nh ich they era <br />epplieable, applying Leihnitz'a rule, and summing the two solutf ohs resat is fn the <br />foll owi n9 aquati one <br />17-6 Revised 04/77/88 <br />• <br />REVISED MARCH 2006 Attachment 2.05.6(3)-2-13 <br />