Locating Areas Suitable for the Flood Spreading Plan Using GIS and Analytical Hierarchy Process (AHP), (A Case Study: Central Plain of Khorramabad)

Use of flood distribution as a tool to reduce flood damage associated by optimizing the exploitation of floods to restore natural resources and environmental resources has been fashionable in many parts of the world. Considering the number of parameters identifying zones or areas appropriate for flood spreading plans، particularly aimed at feeding aquifers، the use of modern methods of production and new methods of synthesis and the decision making is inevitable. In this study، the Central Plains Khorramabad was selected as the study area. Method in this study is based on a hierarchical analysis process. The purpose of this study is the use of decision support systems and geographic information systems in order to achieve the appropriate places to distribute floods، and after identifying the criteria، indicators and sub-indicators associated by targets (based on the review of internal and external sources)، the mentioned criteria، indicators and sub-indicators were weighted using the AHP and the priority of each criteria and sub-criteria was identified. The study includes four main criteria، 11 indicators، and18 sub-criteria. In this study، the weights of the main criteria were considered identical. The results showed that for 11 indicators، the highest and the lowest weight is related to physical damage index and aquifer parameters، respectively. For 18 sub-indicators in this study، the highest and the lowest weight is related to Sub-criteria of the flood event number and Sub-criteria of water needed for industrial activities. Assessment of appropriate regions to distribute flood in the topographical viewpoints showed that most of regions occur in range of 1200 meters، in east aspect and in >10% slope class. Results of region zoning to distribute flood showed that the highest and the lowest of the study area occurs appropriate and most appropriate class for flood distribution.