# Dagan Slug Test Solution for Unconfined Aquifers

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A mathematical solution by Dagan (1978) is useful for determining the hydraulic conductivity of **unconfined** aquifers when the control well is screened across the water table. Analysis involves matching a straight-line solution to water-level displacement data collected during an overdamped slug test.

AQTESOLV provides visual and automatic methods for matching the Dagan solution to slug 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 Dagan slug test solution:

- aquifer has infinite areal extent
- aquifer is homogeneous and of uniform thickness
- aquifer potentiometric surface is initially horizontal
- control well is screened across the water table
- a volume of water, V, is injected or discharged instantaneously from the control well
- aquifer is unconfined
- flow is steady

## Solution

Options

AQTESOLV provides the following options for the Dagan method:

- partially penetrating wells

## Benchmark

## References

Dagan, G., 1978. A note on packer, slug, and recovery tests in unconfined aquifers, Water Resources Research, vol. 14, no. 5. pp. 929-934.