The equation
representing the groundwater mound beneath a rectangular recharge area is
given by:

where h_{m}
is the maximum height of the mound; h_{i} is the initial height of
the water table; w is the recharge or percolation rate; K is the hydraulic
conductivity; t is the time of interest; L and W are the length and width of
the rectangular recharge area, and ε is the specific yield of the aquifer.
S* is an integral equation given by:

This equation is
estimated in the calculator by using a table of values given by
Hantush
(1967).

You can also perform
mounding calculations with graphical display using: