Abstract
Neuman (Analysis of pumping test data from anisotropic unconfined aquifers considering delayed gravity response. Water Resources Research, 1975) method is an analytical solution suitable for unsteady flow of the wells that penetrate partially or fully in an unconfined anisotropic aquifer with a delayed gravitational response. The method is said to be valid when Sy/S > 10, for observation wells near the pumping wells where the drawdown observations made after adequate long pumping time. Although the method is widely used, the impact of using the Neuman (Analysis of pumping test data from anisotropic unconfined aquifers considering delayed gravity response. Water Resources Research, 1975) solution for interpretation of multiwell pumping aquifer tests data is barely discussed. In this chapter, the study examines and discusses the effect of using the Neuman solution for interpretation of multiwell pumping aquifer tests. It is accomplished by the simulation of two different homogeneous single-layered unconfined aquifer model’s as it is not easy to analyze in the heterogeneous condition since the transmissivity everywhere can differ naturally with the location of an aquifer. MODFLOW numerical modeling has been used for the time-drawdown simulation and interpreted the results using the Neuman solution. The study concluded that under the control of Neuman equation, the transmissivity interpreted from an observation well with an increase in radial observation well distance appears as increasing exponentially and in case of specific yield, it is observed as decreasing due to its less responsive nature to influence of the observation well distance. The study is helpful for the application of Neuman solution to the interpretation pumping test data at different radial distances of multiwell aquifers.
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Rane, N., Jayaraj, G.K. (2021). Evaluation of Multiwell Pumping Aquifer Tests in Unconfined Aquifer System by Neuman (1975) Method with Numerical Modeling. In: Pande, C.B., Moharir, K.N. (eds) Groundwater Resources Development and Planning in the Semi-Arid Region. Springer, Cham. https://doi.org/10.1007/978-3-030-68124-1_5
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