Abstract
AbstractSpatial and temporal variations in the groundwater quality of the Araniar River Basin, south India, were studied to determine its suitability for irrigation through development of irrigation water quality index (IWQI) maps of post‐ and pre‐monsoon periods. The spatial thematic maps of electrical conductivity (EC), sodium absorption ratio (SAR), residual sodium carbonate (RSC) and sodium percentage (Na%) were developed using a geographic information system (GIS) and compared with the respective United States Department of Agriculture (USDA) standards. The pertinent maps of irrigation water quality parameters based on FAO‐29 guidelines were prepared, rasterized and overlaid using a GIS to develop IWQI maps for the basin. The IWQI maps indicated that 75% of the basin area possesses highly suitable irrigation water post‐monsoon, with medium suitability (90.7% of the basin) predominating during pre‐monsoon. Copyright © 2015 John Wiley & Sons, Ltd.
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