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Neuman-Witherspoon Solution for Confined Two-Aquifer Systems with LeakageDescriptionA mathematical solution by Neuman-Witherspoon (1969) is useful for determining the hydraulic properties of leaky aquifer systems (transmissivity and storage coefficient of the pumped aquifer; vertical hydraulic conductivity and storage coefficient of aquitard; and transmissivity and storage coefficient of the unpumped aquifer). Analysis involves matching the solution to water-level displacement data collected during a pumping test. Observation wells may be screened in the pumped aquifer, unpumped aquifer or aquitard. Unlike the Hantush-Jacob (1955) and Hantush (1960) solutions for leaky aquifers, the Neuman-Witherspoon (1969) solution accounts for drawdown in the unpumped aquifer. Neuman and Witherspoon showed that the assumption of no drawdown in the unpumped aquifer (i.e., a constant head boundary condition) can lead to significant errors when estimating the hydraulic properties of the pumped aquifer.
AssumptionsThe following assumptions apply to the use of the Neuman-Witherspoon solution:
Solution OptionsAQTESOLV for Windows provides the following options for the Neuman-Witherspoon solution:
ReferencesNeuman, S.P. and P.A. Witherspoon, 1969. Theory of flow in a confined two aquifer system, Water Resources Research, vol. 5, no. 4, pp. 803-816. |
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