Abstract
Comparative analysis of time-dependent drawdown alterations caused by the heterogeneous properties of stratified formations is given based on solutions developed under different assumptions on interlayered crossflow. The assumption of proportionality of leakage to the differential flow depletion, which is widely used in leaky aquifers developments, severely modifies the calculated drawdown values for both the aquifer and the aquitard as compared to those values obtained by assuming the diffusivity distribution process for the flow within each layer. The drawdown pattern is particularly affected at the early times. It is shown that if the compressibility of the low-permeability layer is taken into account, the shape of transient drawdown curves is a function not only of the ratio of permeabilities of the permeable and the semi-permeable layers but of the ratio of their storages as well.
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