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Falling-head permeability tests may be performed in two ways: (1) with a constant tailwater pressure and (2) with a rising tailwater pressure. Equations published in textbooks and manuals for calculating hydraulic conductivity from a falling-head test are for the first type of test only and are in error by a factor of 2 when applied to the second type of test. The correct equations for calculating hydraulic conductivity for both types of test are derived and confirmed.
Associate professor of civil engineering, University of Texas, Austin, TX
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