Flood risk management centred on clusters of territorial vulnerability

Traditionally, risk management has been focused on the control of hazards. However, this field of research is now more aimed at reducing vulnerability. Methodology for gaining accurate knowledge of territorial vulnerability is proposed here. It is available for all types of hazard and applicable to any territory. It is based on a census of elements at risk and uses expert weighting to define vulnerability, relying on semi-structured interviews with local stakeholders. Finally, spatial statistics are used to highlight key areas of a town with clusters of higher vulnerability. This method is applied in this article to Greater Lyon urban area, in France