A GIS analysis approach for flood vulnerability and risk assessment index models at sub-district scale

This paper presents flood vulnerability and risk assessment index models, with the aim to establish a spatial risk index at sub-district scales for urban flood scenarios in the Makassar region. Firstly, the overall vulnerability assessment to floods based on the local framework analysis of the BNPB (The Indonesian National Board for Disaster Management) has been developed using Geographical Information System (GIS) analysis. These indicators were composed of various social, physical, economic, and environmental factors. Second, GIS analysis conducts grid index modeling of flood hazard model by incorporating the measurement of floods in 2013 as a flood hazard scenario. Finally, by combining the spatial factors of flood hazard and flood vulnerabilities, a flood risk assessment model has been simulated at sub-district scales to evaluate the potential impacts on social, physical, economic, and environmental aspects.