Evaluation of Groundwater Hydro-geochemical Characteristics in Basht Plain Aquifer and its Suitability using Qualitative Indicators

In this research, to evaluate the groundwater resource Hydro-geochemical Characteristics in Basht Plain aquifer, Analytical results of 10 groundwater samples in dry and wet periods are used. One of the main factors that deteriorate the quality of groundwater is local geology which comprises mostly sedimentary rocks and in particular evaporates. To estimate of water quality, Hydro-geochemical diagrams, Geological Investigations, Ionic exchange, and Saturation Index studied. The type and facies of water in study area is Ca2+–HCO3- and Ca2+ – SO42-. The results of calculated saturation index show that the saturation index for carbonate minerals is positive and for sulfate minerals is negative. Reverse and normal ion exchange is one of the chemical processes controlling the chemical composition of groundwater. Based on the results, the water quality is controlled by flow paths and reservoir lithology. The GWQI map of ground water in aquifer shows that 91.3 and 8.7 percentage of ground water resources in this area are in good and bad category.