Moench Solution for Leaky Aquifers

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Butler (1998)

Moench Solution for Leaky Aquifers

Description

A mathematical solution by Moench (1985) is useful for determining the hydraulic properties (transmissivity and storage coefficient of aquifer, vertical hydraulic conductivity and storage coefficient of aquitard and wellbore skin) of leaky aquifers. Analysis involves matching the solution to water-level displacement data collected during a pumping test. The Moench solution accounts for wellbore storage and wellbore skin.

AQTESOLV for Windows provides visual and automatic methods for matching the Moench 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 Moench solution:

	aquifer has infinite areal extent
	aquifer is homogeneous, isotropic and of uniform thickness
	aquifer potentiometric surface is initially horizontal
	pumping well is fully penetrating
	flow to pumping well is horizontal
	aquifer is leaky
	flow is unsteady
	water is released instantaneously from storage with decline of hydraulic head
	confining bed(s) has infinite areal extent, uniform vertical hydraulic conductivity and storage coefficient, 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 for Windows provides the following options for the Moench solution:

	large-diameter pumping wells
	variable pumping rates
	multiple pumping wells
	multiple observation wells

References

Moench, A.F., 1985. Transient flow to a large-diameter well in an aquifer with storative semiconfining layers, Water Resources Research, vol. 21, no. 8, pp. 1121-1131.