In case of natural events, causing significant damages to public and private properties (buildings, cars, power networks with business interruptions, etc.), the insurance companies need to gather precise and accurate information on the localisation, the nature and the estimated amount of the damage, in order to deliver an effective claims management service to their policy-holders and to deliver to various stakeholders (public authorities, repair services, press, etc) extensive information about economic consequences of the event. This paper presents the development and the demonstration of Spatial Decision Support System capabilities. The application is dedicated to flood hazard prevention. It consists of a set of data related to flood and urban area layered thanks to a Geographical Information System (GIS). This R&D action is based on a close collaboration with insurance companies.