Consider the case of two wells in an infinite aquifer as shown in Figure 9.6.1, in which water is discharged (positive Q) from well 1 and is recharged (negative Q) into well 2. This case is referred to as a sink-and-source problem.
The potential $ at a point which is located at a distance r1 from well 1 and r2 from well 2 can be expressed when the potential $1 is superimposed with respect to well 1 and $2 is superimposed with respect to well 2 as
The constant C = $o @ r1 = r2 = R If Q1 = Q2 = Q in a special case, then
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