Three types of boundary conditions are taken into account:
1 2 3
Schematic plan view of a wedge-shaped aquifer
Horizontal distances from the observation well to image wells
The following equations are used to evaluate the distance to image wells (n is the number of image wells):
Ferris J.G., Knowles D.B., Brown R.N., Stallman R.W. Theory of aquifer test // U.S. Geological Survey Water-Supply. 1962. Paper1536-E.