Neuman Solution for Unconfined Aquifers

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Neuman Solution for Unconfined Aquifers

Description

A mathematical solution by Neuman (1974) and enhanced by Moench (1993, 1996) 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 Neuman solution accounts for delayed gravity response and partial penetration.

AQTESOLV for Windows provides visual and automatic methods for matching the Neuman solution to pumping test data. This easy-to-use and intuitive software promotes rapid and accurate determination of aquifer properties. AQTESOLV for Windows uses the latest algorithms by Moench (1993, 1996) to compute the well function for the Neuman solution.

Assumptions

The following assumptions apply to the use of the Neuman solution:

	aquifer has infinite areal extent
	aquifer is homogeneous, isotropic and of uniform thickness
	aquifer is unconfined
	flow is unsteady
	diameter of pumping well is very small so that storage in the well can be neglected

Solution Options

AQTESOLV for Windows provides the following options for the Neuman solution:

	variable pumping rates
	multiple pumping wells
	multiple observation wells
	partially penetrating pumping and observation wells

References

Neuman, S.P., 1974. Effect of partial penetration on flow in unconfined aquifers considering delayed gravity response, Water Resources Research, vol. 10, no. 2, pp. 303-312.

Moench, A.F., 1993. Computation of type curves for flow to partially penetrating wells in water-table aquifers, Ground Water, vol. 31, no. 6, pp. 966-971.

Moench, A.F., 1996. Flow to a well in a water-table aquifer: an improved Laplace transform solution, Ground Water, vol. 34, no. 4, pp. 593-596.