--> Abstract: Variations in Calculated Hydraulic Conductivities, by J. J. Kersting and D. H. Easley; #90987 (1993).

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KERSTING, J. JEFFREY, and DALE H. EASLEY, Univ. of New Orleans, New Orleans, LA

ABSTRACT: Variations in Calculated Hydraulic Conductivities

The methods of Hvorslev and of Bouwer and Rice have long been used as means of calculating hydraulic conductivities from slug tests of unconfined aquifers. Each method is based on similar, but not identical assumptions and parameters. This study was designed to compare results obtained by each of these methods from real-life data sets.

Slug tests were run in four well fields containing three wells each. Each well was tested either two or three times, and conductivities were derived using both the Hvorslev and the Bouwer and Rice methods. Results were compared to determine variations between well fields, variations between wells within a field, variations between replicates, and variations between analysis techniques at a given well.

Differences between well fields provides the greatest source of variability. However, analysis technique produces significant Variability between wells within a field, and the choice of curve fit for water recovery diagrams caused differences in results. These differences can be important, especially when it is necessary to determine naturally occurring temporal or spacial variation within an aquifer.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.