ABSTRACT
The drawdown-time curve flattens at intermediate time as if there is recharge or leakage through the underlying or overlying aquitard, then resumes a Theis-like well-function behavior at late time. The Dupuit-Forchheimer theory of steady flow in an unconnned aquifer bounded by a free surface is based on two assumptions: the flowlines are horizontal and the equipotential surfaces are vertical and the hydraulic gradient equals the slope of the water table. The effect of gravity drainage is delayed with respect to the instantaneous elastic behavior. The early- and late-time responses to pumping of a nonzero diameter well in the water table aquifer approach the corresponding behavior for a pumping well of nonzero diameter in a confined aquifer. The.
