Dougherty-Babu Solution for a Confined Aquifer

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Dougherty-Babu
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Dougherty-Babu Solution for Confined Aquifers

Description

A mathematical solution by Dougherty and Babu (1984) is useful for determining the hydraulic properties (transmissivity, storativity and hydraulic conductivity anisotropy ratio) of confined aquifers. Analysis involves matching the solution to water-level displacement data collected during a pumping test. The Dougherty-Babu solution accounts for wellbore storage effects in a finite-diameter, partially penetrating well with wellbore skin. Moench (1988) extended the method to account for anisotropic conditions.

AQTESOLV for Windows provides visual and automatic methods for matching the Dougherty-Babu 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 Dougherty-Babu solution:

	aquifer has infinite areal extent
	aquifer is homogeneous, anisotropic and of uniform thickness
	pumping well is fully or partially penetrating
	flow to pumping well is horizontal when the pumped well is fully penetrating
	aquifer is confined
	flow is unsteady
	water is released instantaneously from storage with decline of hydraulic head

Solution Options

AQTESOLV for Windows provides the following options for the Dougherty-Babu solution:

	large-diameter pumping wells
	variable pumping rates
	multiple pumping wells
	multiple observation wells
	partially penetrating wells
	boundaries

References

Dougherty, D.E and D.K. Babu, 1984. Flow to a partially penetrating well in a double-porosity reservoir, Water Resources Research, vol. 20, no. 8, pp. 1116-1122.

Moench, A.F., 1988. The response of partially penetrating wells to pumpage from double-porosity aquifers, Proceedings of the International Conference on Fluid Flow in Fractured Rocks, Atlanta, GA, May 16-18, 1988.