Jacob-Lohman Solution for Constant-Head Tests in NonLeaky Confined Aquifers
Description
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.
AQTESOLV 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, isotropic and of uniform thickness
- potentiometric surface is initially horizontal
- aquifer is nonleaky 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 Jacob and Lohman solution:
- recovery
Benchmark
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.
See also: solution methods, constant-head tests