Flood susceptibility assessment using GIS-AHP and morphometric analysis in the El Malabiod Watershed, Northeastern Algeria

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 flood susceptibility. These criteria were synthesized into a flood susceptibility map, identifying areas of high, moderate, and minimal 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.