Jacob and Lohman Solution for Constant-Head Tests in NonLeaky Confined Aquifers

Well-aquifer configuration for Jacob and Lohman (1951) constant-head test solution for confined aquifers

A mathematical solution by Jacob and Lohman (1952) is useful for determining the hydraulic properties (transmissivity and storativity) of nonleaky confined aquifer. Analysis involves matching the Jacob and Lohman solution to discharge data collected during a constant-head (constant-drawdown) test.

includes type curve and straight-line versions of the Jacob-Lohman solution.

AQTESOLV provides visual and automatic methods for matching the Jacob and Lohman 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 Jacob and Lohman solution:

  • aquifer has infinite areal extent
  • aquifer is homogeneous, anisotropic and of uniform thickness
  • potentiometric surface is initially horizontal
  • control well is fully penetrating
  • aquifer is nonleaky confined
  • flow is unsteady
  • water is released instantaneously from storage with decline of hydraulic head

Solution
Options

provides the following options for the Jacob and Lohman constant-head test solution:

  • recovery

Benchmark

AQTESOLV benchmark for Jacob and Lohman (1952) constant-head test solution for nonleaky confined aquifers
Comparison of AQTESOLV (blue line) and published Jacob and Lohman (1952) discharge function values (symbols).

References

Jacob, C.E. and S.W. Lohman, 1952. Nonsteady flow to a well of constant drawdown in an extensive aquifer, Trans. Am. Geophys. Union, vol. 33, pp. 559-569.