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Slug test

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Slug test

Slug test


In slug test a small volume of water is poured to (or suddenly removed from) the well, after which the subsequent water level recovery to the initial value is measured in the same well or observation well.


Available solutions


Cooper’s solution (confined aquifer, fully penetrating well)

Picking’s solution (confined aquifer, fully penetrating well, non-instantaneous change of initial head)

Bouwer-Rice’s solution (unconfined aquifer, well of full or partial penetration)

Hvorslev’s solutions (a set of solutions for confined and unconfined aquifers and different wellbore constructions)

Fissured aquifer

Partially penetrating well

Sageev's solution (skin, fully penetrating well)

Dougherty-Babu's solution (skin, partially penetrating well)


For slug test analysis the following data should be entered into the Editor: recovery log (time and water level biuldup measurements), maximum drawdown (that is initial jump of hydraulic head), pumping well radius. For partially penetrating pumping well it is necessary to specify the screen length and vertical distance from the middle of the screen to the aquifer top or water level. If Picking’s solution is applied, time of pumping/recovery should be specified.



Bouwer H. The Bouwer and Rice slug test – an update // Ground Water. 1989. Vol. 27, N 3. P. 304–309.

Bouwer H., Rice R.C. A slug test for determining conductivity of unconfined aquifers with completely or partially penetrating wells // Water Resources Research. 1976. Vol. 12, N 3. P. 423–428.

Cooper H.H., Bredehoeft J.D., Papadopulos I.S. Response of a finite diameter well to an instantaneous charge of water // Water Resources Research. 1967. Vol. 3, N 1. P. 263–269.

Bredehoeft J.D., Papadopulos I.S. A method for determining the hydraulic properties of tight formations // Water Resources Research. 1980. Vol. 16, N 1. P. 233–238.

Hvorslev M.J. Time lag and soil permeability in groundwater observations // U.S. Army Corps Eng, Waterways Station. Vicksburg, MS. 1951. Bull. 36.

Picking L.W. Analyzing the recovery of a finite-diameter well after purging at an unknown rate – A substitute for slug-testing // Ground Water. 1994. Vol. 32, N 1. P. 91–95.

Yeh H.-D., Yang S.-Y. A novel analytical solution for a slug test conducted in a well with a finite-thickness skin // Advances in Water Resources. 2006. Vol. 29, N 10. P. 1479–1489.

Barker J.A., Black J.H. Slug test in fissured aquifers // Water Resources Research. 1983. Vol. 19, N 6. P. 1558–1564.

Yeh H.-D., Chen Y.-J., Yang S.-Y. Semi-analytical solution for a slug test in partially penetrating wells including the effect of finite-thickness skin // Hydrol. Process. 2008. Vol. 22. P. 3741–3748.

Sageev A. Slug test analysis // Water Resources Research. 1986. Vol. 22, N 8. P. 1323–1333.

Dougherty D.E., Babu D.K. Flow to a partially penetrating well in a double-porosity reservoir // Water Resources Research. 1984. Vol. 20, N 8, P. 1116–1122.