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

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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, 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

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

- recovery

## Benchmark

## 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.