The use of advanced tools for computation and modelling of natural hazards can be combined with a GIS that has the capability of decision support and advanced visualization to produce models, that will represent the risks of natural hazards and man-made disasters in the form of risk maps, where the risks are categorized and quantified. Very large amounts of data can be processed, quantified and displayed on digital maps, allowing decision makers to assess the situation rapidly
and take appropriate actions. Furthermore, these processes can be automated, enabling near real time access to the risk maps. This can greatly help decision makers with the emergency measures and mitigation in most of the cases. In this article, we present a case study about mapping of flood risks due to a dam burst showing risk maps of flood hazards and available emergency facilities and their significance for risk prevention and mitigation.