Butler-Zhan Solution for Slug Tests in Confined Aquifers

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Butler (1998)

Butler-Zhan Slug Test Solution for Confined Aquifers

Description

A mathematical solution by Butler and Zhan (2004) is useful for determining the hydraulic conductivity, specific storage and hydraulic conductivity anisotropy ratio of confined aquifers. The solution accounts for inertial effects in the well and oscillatory response. Analysis involves matching a type curve to water-level displacement data collected during a slug test.

AQTESOLV for Windows provides visual and automatic methods for matching the Butler-Zhan 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 Butler-Zhan solution:

	aquifer has infinite areal extent
	aquifer is homogeneous and of uniform thickness
	aquifer potentiometric surface is initially horizontal
	pumping well is fully or partially penetrating
	a volume of water, V, is injected or discharged from the well instantaneously
	aquifer is confined
	flow is unsteady
	water is released instantaneously from storage with decline of hydraulic head

Solution Options

AQTESOLV for Windows provides the following options for the Butler-Zhan solution:

	partially penetrating wells
	hydraulic conductivity anisotropy
	observation wells

References

Butler, J.J., Jr. and X. Zhan, 2004. Hydraulic tests in highly permeable aquifers, Water Resources Research, vol. 40, W12402, doi:10.1029/2003WR002998.