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WATER RESOURCES RESEARCH, VOL. 39, NO. 12, 1345, doi:10.1029/2002WR001212, 2003

Direct assessment of groundwater vulnerability from single observations of multiple contaminants

Fred Worrall

Department of Geological Sciences, University of Durham, Durham, UK


Dana W. Kolpin

U.S. Geological Survey, Iowa City, Iowa, USA


Abstract

Groundwater vulnerability is a central concept in pollution risk assessment, yet its estimation has been largely a matter of expert judgment. This work applies a method for the direct calculation of vulnerability from monitoring well observations of pesticide concentrations. The method has two major advantages: it is independent of the compounds being examined, and it has a direct probabilistic interpretation making it ideal for risk assessment. The methodology was applied to data from a groundwater monitoring program in the midwestern United States. The distribution of the vulnerabilities was skewed toward zero. Spatial distribution of the vulnerabilities shows them to be controlled by both regional and local factors. Methods are presented for estimating the necessary sample sizes for vulnerability studies. The further application of the approach developed in this study to understanding groundwater pollution is discussed.

Received 28 January 2002; accepted 18 November 2002; published 5 December 2003.

Index Terms: 1829 Hydrology: Groundwater hydrology; 1831 Hydrology: Groundwater quality; 1803 Hydrology: Anthropogenic effects; 9350 Information Related to Geographic Region: North America.

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Citation: Worrall, F., and D. W. Kolpin (2003), Direct assessment of groundwater vulnerability from single observations of multiple contaminants, Water Resour. Res., 39(12), 1345, doi:10.1029/2002WR001212.