This study aims to assess the physical and social vulnerability of floods, which occurred in the year 2015 in Adyar Basin of Chennai, Tamil Nadu. Thematic layers, such as rainfall, land use land cover (LULC), drainage density, slope, soil, and roads per watershed, were prepared and assigned the ranks using rank sum method. The knowledge based weighted indexed overlay analysis was employed based on causative factors, to prepare vulnerability map of the Adyar Basin. This research would help the community to find the vulnerability based on multi criteria analysis, by considering certain indicators like household, residential properties of the people living in Adyar basin. This engineering geological study, can play a vital role in comparing the physical and social vulnerability along with the real time vulnerability to ensure public safety, cost-effective solution for planning mitigation measures and preparedness in flood prone areas.