Groundwater vulnerability assessment using GIS-based DRASTIC and GOD in the Asadabad plain

The different models such as drastic and god models has been used to map groundwater vulnerability to pollution in very areas. the main purpose of this is to used two methods, drastic and god, applied to the basin of the asadabad plain in determining groundwater vulnerability to pollution. the results showed in models of drastic and god respectively 2.1% and 1.6% of the areas are high potential vulnerabilities. according to the model drastic at study area 63.6 % of has a low class of groundwater vulnerability to contamination, whereas a total of 34.2% of the study area has moderate vulnerability, that the value for god model was 60.8% and 37.6% respectively.the final results indicate that the aquifer system in the interested area is relatively protected from contamination on the groundwater surface. to mitigate the contamination risks in the moderate vulnerability zones, a protective measure must be put before exploiting the aquifer and before comprehensive agricultural activities begin in the area.