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73. The number of pits nii ned per year must be a whole number, with the number of days all • <br />pits are open for a year being less than or equal to 365 days (i.e., 1 pit open for <br />365 days, 2 pits open 182 day:. each, 3 pits open 121 days each, etc.). <br />Pit inflow values for units determined to be confined were calculated using confined/ <br />unconfined ground water flow equations to account for those portions of the aquifers which <br />become unconfined following the opening of each pit. <br />Pit inflow calculations are based on the following procedures 'developed by Mcwhorter <br />(1982). Equations 1 and 2 describe, one-dimensional unconfined and confined flow. <br />1) d /dh~ dh 0<x< Lu <br />K dx h dx - gya dt <br />2) T d~ _ S dH Lug x~ Lc + Lu <br />dx dt i <br />where: <br />K is the hydraulic conductivity, L/t; ' <br />2 <br />T is the transmissivity, L /t; i, • <br />Sya is the specific yield, dimensionless; <br />S is the confined storage coefficient, dimensionless; ' <br />h is the head in the confined zone, L; <br />H is the pressure head above the confining unit in the confined zone, L; <br />x is the location in Cartesian coordinate space, L; <br />t is time, t; <br />Lu is the distance t,o the unt onfined-confined zone inte rf ac e,'L; and <br />Lc is the distance from the unconfined-co of fined interface to the undisturbed zone, L. <br />Integrating equations 1 and 2 with respect to x over the intervals in which they are <br />applicable, applying Leibnitz's rule, and summing the two solutions results in the <br />following equation: <br />3) q - q = Sya d lu hdx - bLU • 5 d L +LC Hdx - H (LU~Lc) ~~ <br />r o d t JJ\\ d t o <br />o Lu <br />where: • <br />q is the regional flux, L2/t; <br />r <br />q is the flux into the pit, L2/t; <br />0 <br />b Revised 03/24/95 <br />