Barker Solution for Nonleaky Confined and Fractured Aquifers

Description

Well-aquifer configuration for Barker (1983) pumping test

A mathematical solution by Barker (1988) is useful for determining the hydraulic properties (hydraulic conductivity and specific storage of the aquifer or fractures; 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 drawdown 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. includes options for slab and spherical matrix blocks in the double-porosity case.

AQTESOLV provides visual and automatic methods for matching the generalized radial flow model 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 generalized radial flow model:

  • 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

provides the following options for the Barker generalized radial flow model:

  • 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.

See also: solution methods, pumping tests

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