Afsin, M2019-08-012019-08-0119970177-5146https://hdl.handle.net/11480/5834An unconfined aquifer system suggests an open system in the study area. Hydrochemical evolution is related to the flow path of groundwater. The groundwaters are divided into two hydrochemical facies in the study area, 1) Ca-Mg-HCO3 and 2) Ca-Mg-SO4HCO3. Facies 1 has shallow (young) waters which dominate in recharge areas during rapid flow conditions, whereas facies 2 may show shallow and mixed waters which dominate intermediate or discharge areas during low flow conditions. Ionic concentrations, TDS, EC and water quality are related to groundwater residence time and groundwater types. The groundwaters in the plain are chemically potable and suitable for both domestic and agricultural purposes.eninfo:eu-repo/semantics/closedAccesshydrochemical evolutionunconfined aquiferfaciesshallow waterresidence timeArticle31453852212302-s2.0-0030619223N/AWOS:A1997XF98000012Q3