Optimization of DRASTIC and SINTACS Models According to Geographical Information System with the Use in Analytical Hierarchy Process (AHP) (Case Study: Andimeshk Plain)

Because of expansion of agricultural activities and excessive use of chemical fertilizers and location of municipal and industrial wastewater of Andimeshk, it is possible for this aquifer to be polluted. Therefore, the aim of present study is to assess the aquifer vulnerability of Andimeshk plain and recognition of sensitive areas against pollution which this work can be conducted by using DRASTIC and SINTACS models. Although these models are among the most used models for assessment of aquifer vulnerability, therefore these models should be corrected on the basis of local hydrological conditions to obtain correct results. Therefore the main aim of this study is correction of DRASTIC and SINTACS models according to local hydrological conditions and finally determining the best aquifer vulnerable model for the plain. Materials and methods Study area: Andimeshk plain is located in the north west of Khuzestan province with the area of 295 km2 and its geographical coordinates is in north latitude, 32° 15′ to 32° 35′ and east longitude 48° 29′ to 48° XX′. DRASTIC and SINTACS models: Generally, parameters used in these models are consist of depth to watertable, net recharge (effective infiltration), aquifer media (aquifer hydrogeologic characteristics), soil media, topography (slope), impact of vadose zone (unsaturated condition) and hydraulic conductivity.