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Determination of Variances for Maximum and Minimum Transmissivities of Anisotropic Aquifers from Multiple Well Pumping Test Data

An extension of the least squares method given by Neuman et al. (1984) for estimating aquifer parameters is presented, and statistical tests for anisotropy are derived. Methods are also given to construct variance formulas for the principal axes of trans‐missivity and confidence intervals for the angles of orientation. The techniques developed here treat each monitoring well as the experimental unit, in contrast to inverse modeling methods which treat each time step for each well as the experimental unit. We argue that the latter is a form of pseudo‐replication in that the number of time steps may be arbitrarily selected.