Mapping Ground-Water Sodium Adsorption Ratios in Northern Louisiana

by G. Wayne Wilkerson, CADGIS Research Lab,
Robert Edling, CADGIS Research Lab,

Document Type: Proceeding Paper

Part of: Irrigation and Drainage


High sodium concentration is suspected as the cause of several crop failures in the northern part of Louisiana. This study, using Geographic Information Systems (GIS) technology, was undertaken to identify where ground-water of suitable irrigation quality occurs. Well-log information was obtained from the United States Geological Survey (USGS) for the study area in the north central part of the state. Specific conductance and sodium adsorption ratio (SAR) data were ranked according to an irrigation water suitability index. Values from 1-16, representative of the SAR/conductance relationship generated by the index, were assigned to each well location and placed at their correct latitude - longitude coordinate. Index values were then contoured indicating areas of specific ranges in SAR and conductance. Study results are discussed.

Subject Headings: Sodium | Adsorption | Mapping | Water quality | Water resources | Groundwater | Geographic information systems | Water supply | United States | Louisiana

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