Evaluation of the Potential of the water resources of Parao-Bisetoun's karst as the stable water suppliers for Zagros's ecosystems

Underground water is one of the most important natural resources for societies as well as agricultural and industrial activities. One of the most important sources of karst is its water resources. Can help us manage water resources understanding the factors Influencing feeding springs and also, determine areas with high potential of karst water resources. The purpose of this study is to determine the karst water resources potential of the Parao-Bisetoun karstic mass. Hydrochemical analyzes of water were used to understand the origin of karstic springs in the study area. Carbonate type, calcific facies, position in the left region of the Piper diagram and study of molar ratio, all indicate the karstic source of springs in the study area. In this study, take action to determine the potential of underground water resources in the Parao-Bisetoun karstic mass, using the TOPSIS model and the study of 8 variables of lithology, fault density, rainfall, drainage density, slope, elevation, slope and vegetation. For this purpose, used fuzzy logic to standardize the layers and used Analytic Hierarchy Process (AHP) to determine the weight of each layers. Eventually, with the implementation of the model, the map of karst water resources potential of the study area was obtained. The review of the final map indicates the great impact of the two lithological factors and faults on the potential of karst water resources, so that classes with high potential matches on the thick formations of the limestone layer with high density of faults and local fractures.