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Scientific Investigations Report 2008–5149

Summary of Aquifer Test Data for Arkansas—1940–2006

By Aaron L. Pugh

Abstract

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As demands on Arkansas’s ground water continue to increase, decision-makers need all available information to ensure the sustainability of this important natural resource. From 1940 through 2006, the U.S. Geological Survey has conducted over 300 aquifer tests in Arkansas. Much of these data never have been published. This report presents the results from 206 of these aquifer tests from 21 different hydrogeologic units spread across 51 Arkansas counties. Ten of the hydrogeologic units are within the Atlantic Plain of Arkansas and consist mostly of unconsolidated and semi-consolidated deposits. The remaining 11 units are within the Interior Highlands consisting mainly of consolidated rock.

Descriptive statistics are reported for each hydrologic unit with two or more tests, including the mean, minimum, median, maximum and standard deviation values for specific capacity, transmissivity, hydraulic conductivity, and storage coefficient.

Hydraulic conductivity values for the major water-bearing hydrogeologic units are estimated because few conductivity values are recorded in the original records. Nearly all estimated hydraulic conductivity values agree with published hydraulic conductivity values based on the hydrogeologic unit material types. Similarly, because few specific capacity values were available in the original aquifer test records, specific capacity values are estimated for individual wells.

First posted February 25, 2009

For additional information contact:

U.S. Geological Survey
Arkansas Water Science Center
401 Hardin Road
Little Rock, AR 72211-3528

http://ar.water.usgs.gov/

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Suggested citation:

Pugh, A.L., 2008, Summary of aquifer test data for Arkansas—1940-2006: U.S. Geological Survey Scientific Investigations Report 2008-5149, 33 p.



Contents

Abstract

Introduction

Previous Investigations

Generalized Hydrogeologic Framework of Arkansas

Methods

Data and Limitations

Aquifer Test Data

Comparisons with Published Hydraulic Conductivity Values

Summary

Selected References


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