Springer-Gelhar Slug Test Solution for Unconfined Aquifers

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Recommended Book:

Butler (1998)

Springer-Gelhar> Slug Test Solution for Unconfined Aquifers

Description

A mathematical solution by Springer and Gelhar (1991) is used to determine the hydraulic conductivity of unconfined aquifers. The method accounts for inertial effects in the well and oscillatory response. Analysis involves matching a type-curve solution to water-level displacement data collected during a slug test.

AQTESOLV for Windows provides visual and automatic methods for matching the Springer-Gelhar 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 Springer-Gelhar solution:

	aquifer has infinite areal extent
	aquifer is homogeneous and of uniform thickness
	aquifer potentiometric surface is initially horizontal
	test well is fully or partially penetrating
	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 Springer-Gelhar solution:

	partially penetrating wells
	correction for gravel pack porosity
	correction for frictional well loss
	hydraulic conductivity anisotropy

References

Butler, J.J., Jr., 2002. A simple correction for slug tests in small-diameter wells, Ground Water, vol. 40, no. 3, pp. 303-307.

Springer, R.K. and L.W. Gelhar, 1991. Characterization of large-scale aquifer heterogeneity in glacial outwash by analysis of slug tests with oscillatory response, Cape Cod, Massachusetts, U.S. Geol. Surv. Water Res. Invest. Rep. 91-4034, pp. 36-40.

Zlotnik, V.A. and V.L. McGuire, 1998. Multi-level slug tests in highly permeable formations: 1. Modifications of the Springer-Gelhar (SG) model, Jour. of Hydrol., no. 204, pp. 271-282.