# >Peres Et Al. Slug Test Solution for Confined Aquifers

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A mathematical solution by Peres et al. (1989) is useful for determining the hydraulic conductivity of **nonleaky confined** aquifers. The Peres et al. method is based on an exact equation for transforming slug test data into equivalent head data for a constant-rate pumping test with wellbore storage and skin effect. Analysis involves matching a straight-line solution to equivalent head data.

AQTESOLV provides visual and automatic methods for matching the Peres et al. 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 Peres et al. slug test solution:

- aquifer has infinite areal extent
- aquifer is homogeneous, isotropic and of uniform thickness
- aquifer potentiometric surface is initially horizontal
- control well is fully penetrating
- a volume of water, V, is injected or discharged instantaneously from the control well
- aquifer is nonleaky confined
- flow is unsteady
- water is released instantaneously from storage with decline of hydraulic head

## References

Peres, A.M., Onur, M. and A.C. Reynolds, 1989. A new analysis procedure for determining aquifer properties from slug test data, Water Resources Research, vol. 25, no. 7, pp. 1591-1602.