Measuring Resilience on Communalities Involved in Flooding Ombrone River

Abstract The reduction of risks bound to a possible disaster, to which a specific territorial unit could be involved, is a component strictly connected to the concept of sustainable development on its fundamental environmental, economic, political and social facets. Moreover, the evaluation of such reduction, depends not only accumulated resilience, but in particular on realized campaigns for a larger involvement of the people in the matter and on politics addressed to absorb eventual criticalities, concerning both at infrastructural and human components. All this implies that the capacity to absorb a risk is conceived as a hyper-complex system, whose management can be realized by mathematical models that can include a set of criteria, most of times conflicting each other and on which stakeholders are waiting for patchy expectations. Such models, properly of Group Decision Support Systems, able to conciliate qualitative and quantitative points of view by a participated process, can introduce in resilience a concept of measuring such as to point out “if and how much my city is ready”. A case study, related to the communalities near the Italian Ombrone river, is proposed and solved using problematic, that means giving a ranking from the most virtuous communality to the less one.