Theis Recovery Solution for Confined Aquifers

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Theis Recovery
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Recommended Book:

Butler (1998)

Theis Recovery Solution for Confined Aquifers

Description

A mathematical solution by Theis (1935) is useful for determining the hydraulic properties (transmissivity) of confined aquifers from recovery tests. Analysis involves matching the Theis solution to water-level displacement (residual drawdown) data collected during a recovery test.

AQTESOLV for Windows provides visual and automatic methods for matching the Theis solution to recovery 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 Theis recovery solution:

	aquifer has infinite areal extent
	aquifer is homogeneous, isotropic and of uniform thickness
	pumping well is fully
	flow to pumping well is horizontal
	aquifer is confined
	flow is unsteady
	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
	values of u are small (i.e., r is small and t is large)

Solution Options

AQTESOLV for Windows provides the following options for the Theis recovery solution:

variable pumping rates

References

Theis, C.V., 1935. The relation between the lowering of the piezometric surface and the rate and duration of discharge of a well using groundwater storage, Am. Geophys. Union Trans., vol. 16, pp. 519-524.