On the determination of transmissibility and storage coefficients from pumping test data

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Abstract
This paper presents a graphical procedure for determining the formation constants of an artesian aquifer from pumping test data. The procedure is based on the principle that the coefficient of transmissibility is determined by the ratio of the drawdown to its rate of change with respect to the logarithm of the time since pumping started, or s/(δ s/δ log10t), use being made of the non‐equilibrium theory. The computation of formation constants may be performed in two ways, and their results should be checked against each other. A numerical example is given to illustrate the application of the procedure .