Using Cavity Well to Determine Aquifer Thickness and Constants

A simple mathematical approach is presented for using a cavity well to determine aquifer constants like hydraulic conductivity $K$ and specific‐storage coefficient $S_s$. The aquifer may be either excessively thick or thin. Mathematical formulas are also available to determine both the radius $r_c$ of the artificially developed cavity below the upper impermeable layer of the confined aquifer and the thickness $H_0$ of the aquifer when it is thin. Mathematical analysis shows that a cavity well, once developed, is an excellent and efficient tool for lifting ground water at a low energy level. It is further proved that without the installation of observation well(s) (depending upon the type of the aquifer, whether excessively thick or thin), the data, collected from within the pumped well, fails to provide information about the aquifer constants, cavity radius, or aquifer thickness.