Determination of suitable sites for rainwater harvesting in Denizli Serinhisar district watershed

Abstract

In this article, the suitable sites for rainwater harvesting of the Serinhisar watershed were determined by accepting the watershed characteristics affecting the rainwater harvesting as criteria and weighting these criteria. For this purpose, a Geographical Information System (GIS) application integrated with the Analytical Hierarchy Process (AHP), which is one of the Multi-Criteria Decision Making methods, was implemented. Firstly, the watershed model was created in the GIS environment and the slope and drainage density criteria were obtained from this model. One of the criteria, the land use data, was combined with the soil class data in the GIS environment to obtain the Curve Number (CN) data. By using this CN data and watershed precipitation data, runoff data and accordingly the last criterion, the runoff potential, were obtained with the Soil Conservation Service - Curve Number (SCS-CN) Method. The criteria, which were given importance and weighted according to each other in the AHP steps by reclassification, were combined in a single map according to their weights and presented as a suitability map.