Moench Solution for Unconfined Aquifers

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Butler (1998)

Moench Solution for Unconfined Aquifers

Description

A mathematical solution by Moench (1997) is useful for determining the hydraulic properties (transmissivity, elastic storage coefficient, specific yield and vertical hydraulic conductivity) of unconfined aquifers. Analysis involves matching the solution to water-level displacement data collected during a pumping test. The Moench solution accounts for delayed gravity response, wellbore storage effects and partial penetration.

AQTESOLV 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 is unconfined
	flow is unsteady

Solution Options

AQTESOLV provides the following options for the Moench solution:

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

Benchmark

Comparison of AQTESOLV (blue lines) and computed values from program by Barlow and Moench (1999) for sample problem in unconfined aquifer (symbols).

References

Moench, A.F., 1997. Flow to a well of finite diameter in a homogeneous, anisotropic water table aquifer, Water Resources Research, vol. 33, no. 6, pp. 1397-1407.

Barlow, P.M., and A.F. Moench, 1999. WTAQ - A computer program for calculating drawdowns and estimating hydraulic properties for confined and water-table aquifers, U.S. Geol. Survey Water-Resources Investigations Report 99-4225, 74p.