The current society is, on the one hand, distinguished by considerable technological development and, on the other hand, is thanks to technology more vulnerable and, moreover, must face global changes not only of climate, but also resulting from human activities. It is therefore necessary to adopt the concept of overall risk within the wider social interest. For decision-making of national, regional and local authorities, it is necessary to define the concept of "acceptable risk" and to create theoretical models (scenarios) of impacts resulting from occurrence of specific disasters involving realisation of these risks. These objectives were set by this research project. Although calculations and analysis of risks are being carried out in the Czech Republic, the current situation cannot be regarded as satisfactory because there are no binding rules and it is necessary to match with the other EU member states. The member states of EU started before our entry started the process of harmonization of identified risks. Therefore, the project focused on introducing systematic access to risk determination, which would provide correct, transparent and repeatable outputs.