Quality Assessment of Groundwater in the Plain of Sarayan Using Water Quality Index (WQI)

Since the WQI index is one of the most suitable indicators for assessing groundwater quality, WQI index for assessing the quality of groundwater resources in two years 2012 and 2017 was used in this research. The parameters used were pH, chloride, sulfate, total solids solubility, total hardness, alkalinity, sodium. The results of the survey showed that the quality of groundwater resources of the Sarayan plain was more than 2012 in 2017. Regarding the multi-year drought in the region, the results showed that excessive pumping of underground water wells and lack of proper management of groundwater resources in 2012 caused a decrease in the quality of water resources. 15% of the water resources are in the bad range and 5% in the very poor range. The implementation of a water resources rehabilitation and balance plan aimed at controlling and managing water resources harvesting and, as a result, balancing nutrition and harvesting of these resources, has made it difficult for plains to be prohibited, but water quality due to reduced harvest and proper management in Operation will increase in 2017, so that all the water resources studied are in good and excellent range.