Preparation of an Average Mapping of Rainwater Harvesting Potential Using Network Analysis Method in Koohrang watershed

Subject Areas : Water Resources

Hasangoli MEHRI babadi ¹ , Hossein Eslami ² , Fariba Darabi ³

1 - M.Sc Civil Engineering,Water Resource Management, Shooshtar unit, Islamic Azad University, Shooshtar-Iran.
2 - Assistant Professor, Department of Water Sciences, Shooshtar unit, Islamic Azad University, Shooshtar-Iran.
3 - PhD student Watershed Management Science and Engineering, Integrated watershed, Gorgan University

Received: 2019-12-19 Accepted : 2020-04-20 Published : 2020-03-10

Keywords: Multi-Criteria Decision, GIS, Network Analysis, water extraction,

Abstract :

Abstract The atmospheric currents in the watershed are covered with snow and rain and return to the atmosphere in the form of evaporation, runoff. The present study was conducted in Koohrang watershed with the aim of determining the potential of rainwater harvesting using ANP and GIS techniques. After preparing basin maps such as land use, slope, etc., the amount of soil infiltration and initial maintenance was determined. Initial results showed that the Koohrang watershed has relatively good maintenance and the highest percentage of curve area is 0.8. The results of ANP method for determining the potential of rainwater harvesting showed that the hydrology criterion is better than the physical and topographic criteria, respectively. In the sub-criteria (land use, soil hydrological group and soil texture), land use performs better than the soil hydrology and soil texture groups in rainwater extraction, and the soil hydrological groups are 2.5 times higher than soil texture. The inconsistency coefficient obtained for comparing the metrics and sub-metrics is 0.8 and 1.2, respectively. By calculating all the effective parameters in calculating runoff potential, a potential map for this watershed was prepared in five floors. The map of rainwater harvesting potential in the Koohrang watershed is relatively good. The overall results showed that the network analysis methods considering different field parameters can be a suitable method for estimating the potential of rainwater harvesting and proper mediation for loss.