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Environmental Health - Toxic Substances


U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993, Water-Resources Investigations Report 94-4015

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Predicting Nitrate-Nitrogen and Atrazine Contamination in the High Plains Aquifer in Nebraska


A.D. Druliner (U.S. Geological Survey, Lincoln, Nebr.) and T.S. McGrath (U.S. Geological Survey, Lincoln, Nebr.)


Three statistical models, developed through the Toxic-Waste--Ground-Water Contamination Program of the U.S. Geological Survey, were used to predict the concentrations of nitrate-nitrogen and atrazine and the probability of atrazine detections in ground water in Buffalo and Hall Counties, south-central Nebraska. The models use a combination of hydrochemical, hydrologic, soils, and land-use explanatory variables, and ARC/INFO techniques to generate maps showing predicted concentrations of the selected contaminants. Confirmational testing of the models and comparison of maps of predicted concentrations to maps of observed concentrations showed that the statistical models were reasonable predictors of nitrate-nitrogen and atrazine concentrations in ground water of the High Plains aquifer in south-central Nebraska.

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