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Theis Parameter Evaluation from Pumping Tests by Sensitivity Analysis
Author(s) -
McElwee Carl D.
Publication year - 1980
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1980.tb03371.x
Subject(s) - aquifer test , sensitivity (control systems) , drawdown (hydrology) , aquifer , test data , computer science , simple (philosophy) , well test (oil and gas) , experimental data , work (physics) , algorithm , mathematics , statistics , groundwater , geotechnical engineering , geology , engineering , petroleum engineering , mechanical engineering , electronic engineering , philosophy , epistemology , groundwater recharge , programming language
Through the years the Theis equation has played an important role in ground‐water hydrology. Comparison of experimental pumping‐test data with this theoretical curve by graphic means has been a standard method of determining aquifer transmissivity and storage. The purpose of this paper is to present a technique and an algorithm to automatically fit experimental pumping‐test data to the Theis equation by obtaining the “best” transmissivity and storage in the least squares sense through the use of sensitivity analysis. The automated fit for pumping‐test data developed in this work should be a useful tool for the ground‐water hydrologist. Use of the technique is simple, quick, and inexpensive, and has the advantage of always being objective. As a measure of the error in fitting, the rms deviation in drawdown is calculated for the “best” transmissivity and storage.