Hydrogeochemistry Studies and Assessment of Groundwater Quality Varations in Sngan-Khaf Plain Using GQI Index

In recent years, quantity and quality of groundwater resources have been faced with the vulnerability risk due to increasing population and industrial and agricultural activities. In this paper, variations of the groundwater quality in Sangan-Khaf plain have been evaluated. With considering the spatial variability of various pollutants, the groundwater quality index (GQI) was used to describe the quality of the groundwater. Main parameters such as TDS, SO4, Ca, Cl, Mg, and Na were used in GQI index calculation. GQI values were obtained between 66.01 to 81.39% which showed that the water quality in the region was in the moderate to good class. The groundwater quality index decreased in the direction of groundwater flow which indicated the effect of lithological changes, carbonate beds and clay zones in the region.