Barker Solution for Pumping Tests in Confined and Fractured Aquifers

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Barker
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Recommended Book:

Butler (1998)

Barker Solution for Confined and Fractured Aquifers

Description

A mathematical solution by Barker (1988) is useful for determining the hydraulic properties (hydraulic conductivity and specific storage of the aquifer; hydraulic conductivity and specific storage of matrix; and flow dimension) of confined (single porosity) and fractured (double porosity) aquifers. Analysis involves matching the Barker solution to water-level displacement data collected during a pumping test. The so-called generalized radial flow model simulates unsteady, n-dimensional flow to a fully penetrating source in an isotropic, single-porosity confined aquifer or a double-porosity fractured aquifer. AQTESOLV includes options for slab and spherical matrix blocks in the double-porosity case.

AQTESOLV provides visual and automatic methods for matching the Barker solution to pumping 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 Barker solution:

	aquifer has infinite extent
	aquifer is homogeneous, isotropic and of uniform extent of flow region
	potentiometric surface is initially horizontal
	aquifer is confined
	flow is unsteady
	wells are fully penetrating
	water is released instantaneously from storage with decline of hydraulic head

Solution Options

AQTESOLV provides the following options for the Barker solution:

	constant or variable pumping rate with recovery
	multiple pumping wells
	multiple observation wells
	boundaries

References

Barker, J.A., 1988. A generalized radial flow model for hydraulic tests in fractured rock, Water Resources Research, vol. 24, no. 10, pp. 1796-1804.

Moench, A.F., 1984. Double-porosity models for a fissured groundwater reservoir with fracture skin, Water Resources Research, vol. 20, no. 7, pp. 831-846.