Ge of the Hashtgerd Aquifer by Fuzzy Logic-GIS Based Approaches

Over the last two decades, unmanaged using of groundwater resources has increased in Iran. Also decreasing of precipitation, increasing of population and lack of culture creation for water consumers have caused reduction of groundwater level and downing of the plains and deserts. Reduction of using of groundwater resources and increasing of recharge of groundwater resources are two main methods for correct management groundwater resources. In this research, suitable locations will be determined in the Hashtgerd aquifer. In these locations, delayed dams and recharge ponds will be constructed. For considering of uncertainty and necessary criteria, this research utilizes fuzzy logic method. Fuzzy logic method produces effective technical and economic criteria as a grid and determines their fuzzy membership functions. By using of fuzzy overlapping, suitable locations were distinguished. These locations are in around and the bed of the Kordan River (the upstream of Tehran- Tabriz highway) with a total area of 90 hectares and the downstream of Tehran- Tabriz railway with a total area of 350 hectares. By attention to groundwater flow direction and selection of optimum area for artificial recharge of aquifer, around and the bed of the Kordan River (the upstream of Tehran- Tabriz highway) with a total area of 90 hectares was selected for construction of delayed dams and recharge ponds. The water volume for artificial recharge was predicted 12 MCM per year.