Theis Solution for Confined Aquifers

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Theis
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Butler (1998)

Theis Solution for Confined Aquifers

Description

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

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

AQTESOLV also includes Jacob's correction for partial dewatering of water-table aquifers, thereby allowing use of the Theis solution for unconfined aquifers.

Assumptions

The following assumptions apply to the use of the Theis solution:

	aquifer has infinite areal extent
	aquifer is homogeneous, isotropic and of uniform thickness
	pumping well is fully or partially penetrating
	flow to pumping well is horizontal when pumping well is fully penetrating
	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

Solution Options

AQTESOLV provides the following options for the Theis solution:

	variable pumping rates
	multiple pumping wells
	multiple observation wells
	partially penetrating pumping and observation wells

Benchmark

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.

Hantush, M.S., 1961a. Drawdown around a partially penetrating well, Jour. of the Hyd. Div., Proc. of the Am. Soc. of Civil Eng., vol. 87, no. HY4, pp. 83-98.

Hantush, M.S., 1961b. Aquifer tests on partially penetrating wells, Jour. of the Hyd. Div., Proc. of the Am. Soc. of Civil Eng., vol. 87, no. HY5, pp. 171-194.