Hantush-Jacob r/B Solution for Leaky Aquifers

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Hantush-Jacob r/B Solution for Leaky Aquifers

Description

A mathematical solution by Hantush and Jacob (1955) is useful for determining the hydraulic properties (transmissivity and storativity of aquifer, vertical hydraulic conductivity of aquitard) of leaky aquifers. Analysis involves matching the Hantush-Jacob solution to water-level displacement data collected during a pumping test. The solution assumes no storage in the aquitard and also accounts for partially penetrating wells (Hantush 1961a,b).

AQTESOLV provides visual and automatic methods for matching the Hantush-Jacob solution to pumping 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 Hantush-Jacob solution:

	aquifer has infinite areal extent
	aquifer is homogeneous, isotropic and of uniform thickness
	pumping well is fully or partially penetrating
	flow to pumping well is horizontal when pumping well is fully penetrating
	aquifer is leaky
	flow is unsteady
	water is released instantaneously from storage with decline of hydraulic head
	diameter of pumping well is very small so that storage in the well can be neglected
	confining bed(s) has infinite areal extent, uniform vertical hydraulic conductivity and uniform thickness
	confining bed(s) is overlain or underlain by an infinite constant-head plane source
	flow in the aquitard(s) is vertical

Solution Options

AQTESOLV provides the following options for the Hantush-Jacob solution:

	variable pumping rates
	multiple pumping wells
	multiple observation wells
	partially penetrating pumping and observation wells

Benchmark

References

Hantush, M.S. and C.E. Jacob, 1955. Non-steady radial flow in an infinite leaky aquifer, Am. Geophys. Union Trans., vol. 36, pp. 95-100.

Hantush, M.S., 1961a. Drawdown around a partially penetrating well, Jour. of the Hyd. Div., Proc. of the Am. Soc. of Civil Eng., vol. 87, no. HY4, pp. 83-98.

Hantush, M.S., 1961b. Aquifer tests on partially penetrating wells, Jour. of the Hyd. Div., Proc. of the Am. Soc. of Civil Eng., vol. 87, no. HY5, pp. 171-194.