Floodwater Spreading Site Selection Using Decision Support System & GIS in Mashkid Area in Sistan & Baluchistan Province

Iran is located in one of the driest land regions of the world, where water is a limiting factor for lasting life, therefore using seasonal floodwaters is very important in arid and semi arid regions. On the other hand special attention has been paid to artificial groundwater recharge in these regions. Floodwater spreading on the permeable terrain is one of the flooding control way and utilization methods. Determination of appropriate site for water spreading is one of the most important stages of this project. Parameters considered in the selection of groundwater artificial recharge locations are diverse and complex. These factors consist of earth sciences (geology, geomorphology and soils), hydrology (runoff, sediment yield, infiltration and groundwater conditions) and socio-economic aspects (irrigated agriculture, flood damage mitigation, environment, job creation and so on). Hence, decision making depends on criteria of diverse nature. The goal of this study is defining a Decision Support System for floodwater site selection in Mashkid area. Four main criteria were selected in this research are floodwater characters, infiltration, water application and flood damage. In order to determining the importance of factors, Analytical hierarchy Process and GIS was used. It will be expected that soil texture and floodwater volume of water application and floodwater main criteria are two important factors among other criteria (Hypothesis). After providing output maps which had been defined in several scenarios to determine the best locations for floodwater spreading and finally investigates sums suitability and averages suitability of each sub basin.