Moench Solution for Fractured Aquifers

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Moench Solution for Fractured Aquifers

Description

A mathematical solution by Moench (1984) is useful for determining the hydraulic properties (hydraulic conductivity of fractures and matrix, specific storage of fractures and matrix, wellbore and fracture skin) of fractured aquifers. Analysis involves matching the solution to water-level displacement data collected during a pumping test. The Moench solution accounts for flow in a double-porosity system consisting of consisting of low-permeability, primary porosity blocks and high-permeability, secondary porosity fissures with wellbore storage, wellbore skin and fracture skin. The matrix may contain either slab or spherical blocks.

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 has uniform thickness
	aquifer potentiometric surface is initially horizontal
	pumping and observation wells are fully penetrating
	fractured aquifer represented by double porosity system consisting of low-permeability, primary porosity blocks and high-permeability, secondary porosity fissures
	matrix consists of slab-shaped or spherical blocks
	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 Moench solution:

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

References

Moench, A.F., 1984. Double-porosity models for a fissured groundwater reservoir with fracture skin, Water Resources Research, vol. 20, no. 7, pp. 831-846.