Zonation of Suitable Areas for Ground water Artificial Recharge in Varamin Plain using GIS and Decision Support System (DSS)

Determination of suitable areas for artificial groundwater recharge is very essential and should be carried out accurately. Due to the fact that different factors are effective in making an area suitable for this purpose and that some factors change continuously and have mutual effects on each other, GIS is a useful tool for using and managing spatial data. In this research, five parameters were determined as effective ones in artificial recharge zonation and were studied and classified. The parameters are as follows: The amount of slope, infiltration, alluvium thickness, transmissivity of water through alluvium and alluvium quality. After presentation of map of each parameter, different information layers were overlaid in GIS environment. Finally by using Dss (Decision Support System), decision was made for different cases and the suitable regions in the studied area were determined and mapped. Four classes of suitability were defined as follows: Very suitable, suitable, moderately suitable and non-suitable. The results have shown that about %7 of the Varamin plain is suitable for artificial groundwater recharge.