Spatial distribution of nitrate and related factors in the High Plains Aquifer,Texas |
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| Authors: | Nicholas Enwright Paul F Hudak |
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| Institution: | (1) Department of Geography and Environmental Science Program, University of North Texas, P.O. Box 305279, Denton, TX 76203-5279, USA; |
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| Abstract: | Utilizing geographic information systems (GIS) and statistics, objectives of this study were to evaluate: (a) the spatial
distribution of nitrate concentrations in groundwater, and (b) associations between nitrate concentrations and: proximity
to playa lakes, hydraulic conductivity of soil, well depth, and land use in the High Plains Aquifer, Texas. Data were compiled
from wells sampled during 2000–2008. Nitrate concentrations in approximately 9% of wells exceeded the maximum contaminant
level for drinking water. Concentrations were generally higher beneath urban and agricultural land, under permeable soil,
and in shallow wells (especially in the southern part of the study area). However, concentrations were lower near playa lakes.
While playas focus recharge to groundwater, denitrification in reducing environments lower nitrate concentrations beneath
them. This study identifies areas vulnerable to nitrate contamination that warrant continued monitoring and mitigation efforts. |
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