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<br />MODEL USED IN DETERMINATION OF <br />HVDROLOGIL CONSEQUENCES <br />• <br /> <br />Pit Inflow Model <br />The mathematical model AQUILIS was used to perform calculations required in <br />the analytic solution of problems of confined and unconfined flow to a mine <br />pit of varying size and shape. The model is based on equations developed by <br />McWhorter (1981) for steady state confined flow to a line sink. These <br />equations are presQnted as equations la and lb in Table 1 Computed flow <br />is dependent on the rate of pit advancement, elapsed time since the unit was <br />penetrated, storage coefficient, transmissivity, and initial head. The basic <br />equation differs depending on whether or not the whole length of the sink is <br />exposed. This is stated mathematically as a restriction on the time factor in <br />the equations. Equation la is used while the sink is advancing and equation <br />lb is used after the entire sink is established. When the elapsed time is <br />equal to the time of cut completion, equations la and ltr result in the same <br />flow. Equations 2a and 2b compute discharge to the pit for strictly <br />unconfined conditions. Again, the restriction on the time factor concerns the <br />time at which the whole sink has been opened. Equations 3a and 3b are valid <br />for combined confined and unconfined conditions, again with the same time <br />restrictions. <br /> <br />r <br />