Cooley-Case Solution for a Leaky Aquifer with a Water-Table Aquitard

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Butler (1998)

Cooley-Case Solution for Leaky Aquifers

Description

A mathematical solution by Cooley-Case (1973) is useful for determining the hydraulic properties (transmissivity, storativity and leakage parameters) of a leaky aquifer with a water-table aquitard. Analysis involves matching the Cooley-Case solution to water-level displacement data collected during a pumping test.

AQTESOLV for Windows provides visual and automatic methods for matching the Cooley-Case solution to pumping test data. This easy-to-use and intuitive software promotes rapid and accurate determination of aquifer properties.

Assumptions

The following assumptions apply to the use of the Cooley-Case solution:

	aquifer has infinite areal extent
	aquifer is homogeneous, isotropic and of uniform thickness
	potentiometric surface is initially horizontal
	aquifer is confined
	flow is unsteady
	wells are fully penetrating
	water is released instantaneously from storage with decline of hydraulic head
	diameter of pumping well is very small so that storage in the well can be neglected
	confining bed has infinite areal extent, uniform vertical hydraulic conductivity, storage coefficient, specific yield and thickness
	flow is vertical in the aquitard

Solution Options

AQTESOLV for Windows provides the following options for the Barker solution:

	constant or variable pumping rate with recovery
	multiple pumping wells
	multiple observation wells
	boundaries

References

Cooley, R.L. and C.M. Case, 1973. Effect of a water table aquitard on drawdown in an underlying pumped aquifer, Water Resources Research, vol. 9, no. 2, pp. 434-447.