Moench Solution for Constant-Head Tests in Leaky Aquifers

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Moench Solution for Constant-Head Tests in 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. AQTESOLV for Windows uses a general formula (Van Everdingen and Hurst 1949) to transform the constant-rate solution by Moench to a constant-head condition. Analysis involves matching the solution to discharge data collected during a constant-head 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 constant-head 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
	wells are fully penetrating
	aquifer is leaky confined
	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:

recovery

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.

Van Everdingen, A.F. and W. Hurst, 1949. The application of the Laplace transformation to flow problems in reservoirs, Petroleum Transactions, AIME, vol. 186, pp. 305-324.