Barker Solution for Constant-Head Tests in Confined and Fractured Aquifers

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Barker Solution for Constant-Head Tests in Confined and Fractured Aquifers

Description

A mathematical solution by Barker (1988) is useful for determining the hydraulic properties (transmissivity and storativity of 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 discharge data collected during a constant-head 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 for Windows provides visual and automatic methods for matching the Barker solution to constant-head 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 areal extent
	aquifer is homogeneous, isotropic and of uniform thickness
	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 for Windows provides the following options for the Barker solution:

recovery

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.