Dagan Slug Test Solution for Unconfined Aquifers

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Dagan Slug Test Solution for Unconfined Aquifers

Description

A mathematical solution by Dagan (1978) is useful for determining the hydraulic conductivity of unconfined aquifers when the test well is screened across the water table. Analysis involves matching a straight-line solution to water-level displacement data collected during a slug test.

AQTESOLV for Windows provides visual and automatic methods for matching the Dagan solution to slug 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 Dagan solution:

	aquifer has infinite areal extent
	aquifer is homogeneous and of uniform thickness
	aquifer potentiometric surface is initially horizontal
	test well is screened across the water table
	a volume of water, V, is injected or discharged from the well instantaneously
	aquifer is unconfined
	flow is steady

Solution Options

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

partially penetrating wells

References

Dagan, G., 1978. A note on packer, slug, and recovery tests in unconfined aquifers, Water Resources Research, vol. 14, no. 5. pp. 929-934.

Boast, C.W. and D. Kirkham, 1971. Auger hole seepage theory, Soil Science of America Proceedings, vol. 35, no. 3, pp. 365-373.