Flood Susceptibility Mapping using GIS-AHP method and morphometric analysis in the El Malabiod Watershed N.E of Algeria

Abstract This study aims to assess flood susceptibility in the El Malabiod watershed in Algeria, using a combined approach of morphometric analysis, land use/land cover mapping, soil texture mapping, and the Analytic Hierarchy Process (AHP) method. Morphometric analysis quantified the geomorphological characteristics of the basin, such as slope, drainage density, and relief, which influence the hydrological behavior of the basin. Concurrently, land use/land cover and soil texture maps were integrated to provide a comprehensive view of surface factors affecting infiltration and runoff. The AHP method was applied to weight and combine these different criteria into a flood susceptibility map. This map identifies areas of high, moderate, and low risk, thereby facilitating flood risk planning and management. The results show a significant correlation between high susceptibility zones and historically recorded flood events, confirming the validity of the adopted methodology. This work provides a valuable tool for local decision-makers and water resource managers, assisting in the implementation of flood prevention and management measures, and optimizing land use planning in the El Malabiod basin.