Estimating Aquifer Parameters for Large‐Diameter Wells

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Abstract
Two alternative methods of analyzing the response of large‐diameter wells are considered—the curve matching technique based on analytical solutions and the use of a numerical model. For ideal situations the methods give the same results but for unconfined aquifers where the decrease in saturated depth is significant, the curve matching technique is unreliable. Two particular examples are considered in detail. In a confined aquifer, where the diameter of the dug portion of the well is much larger than the diameter of the hole bored through the confined stratum, the response is found to be particularly sensitive to the ratio of these diameters. In an unconfined aquifer test, the important feature is the reduction in abstraction rate as the well is emptied. For each example, the recovery data is of critical importance in analyzing the tests.

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