Abstract
The Adayar River Basin in Chennai, Tamil Nadu, is plagued by recurring inundation events, posing substantial hazards to human settlements and critical infrastructure. In response, this research endeavors to develop a flood susceptibility map to pinpoint regions within the basin prone to flooding. Leveraging Geographic Information Systems (GIS) and employing the Analytical Hierarchy Process (AHP) methodology via GIS software, an array of spatial and non-spatial variables influencing flood susceptibility were meticulously examined and weighted. By integrating diverse hydrological, geological, and meteorological parameters and applying AHP's pairwise comparison, a holistic understanding of flood susceptibility was attained. The GIS approach enables visualizing spatial patterns and identifying high-risk flood areas. In this paper, the flood susceptibility map has been characterized into five different classes which include Very High region, High region, Moderate region, Low region, and Very Low region, based on this characterization a total of 40 vulnerable areas have been identified with 10 very high susceptible areas followed by 16 highly susceptible areas and 14 moderately susceptible areas.