AN INTEGRATED APPROACH TO FLOOD RISK MAPPING FOR FLOOD DETENTION AREAS- A CASE STUDY OF DAY RIVER FLOOD DIVERSION AREA IN THE RED RIVER DELTA, VIET NAM NGUYEN MAI DANG AND MUKAND SINGH BABEL

The risk from natural disasters is an integration of the factors (parameters) of hazard and vulnerability. Population growth in disaster-prone areas in conjunction with socioeconomic development and environmental changes results to the increasing severity of impacts of natural disasters. Worldwide statistics show that flood events are not only increasing but the number of people killed by floods and the associated socioeconomic losses are also rising. It is, therefore, essential to find adaptive solutions for flood risk reduction in flood-prone areas. Comprehensive flood risk mapping can be applied as one of non-structural measures for that purpose. This paper presented an integrated approach to flood risk mapping for flood detention areas with the case study of the Day River Flood Diversion Area (DRFDA) in the Red River Delta (RRD), Viet Nam. The comprehensive food risk maps were developed based on the integration of impact parameters of flood hazard and flood vulnerability. Flood hazard was an integration of hazard-related indicators such as depth, duration and velocity of floodwater, whereas flood vulnerability was a combination of economic, social, and environmental aspects. The economic vulnerability to flood was estimated based on land-uses such as residentia