Flood Susceptibility Assessment through Hydromorphometric Analysis for Ergene River Basin

The aim of this study is to calculate the flood susceptibility for the 14 subbasins of the Ergene River. Flood susceptibility classifications were derived from the analysis of hydromorphometric parameters. The study was based on a 3 dimensional methodology; Linear Analysis (Stream order, Bifurcation ratio, Stream length ratio), Aerial Analysis (Texture ratio, Basin length ratio, Basin shape, Stream frequency, Drainage density) and Relief Analysis (Relief ratio, Time of concentration, Ruggedness number, Basin relief, Hypsometric integral). ALOS Raster DEM satellite data of 12,5 m resolution, dated 2006 and 2008, was used in conjunction with Geographic Information Systems (GIS) technologies. Flood susceptibility of the 14 river sub-basins were categorized in 5 levels from very low to very high degree based on the outcome of the hydromorphometric analysis. While 3 subbasins classified as “moderate”, 1 as “low and 5 others as “very low” in flood susceptibility. 2 subbasins rated “high” and 3 “very high” flood susceptibility