Based on past experience and new developments in the meanwhile, critical areas (areas with significant potential risk of flooding) have been identified. Their selection was based on the analysis of diverse information, collected by different national, regional and local organisms, and stored in a specific database housed in the National Water Resources Information System - SNIRH (http: // snirh. pt). The information collected was mainly obtained from studies and reports and articles on floods, hydraulic projects, Hydrographic Basin Plans (1998-2001), flood news, hydrometric data (continuous records and flood marks) . The data collected cover occurrences associated with the 19th, XX and XI and information on the occurrence of floods and their consequences (hydrological information and quantitative or qualitative consequences assessment). Among the criteria used to select critical areas was the identification of loss of human or missing lives and the number of people affected. The selected critical areas, located in mainland Portugal, were analyzed based on the historical description of 651 registered there. The information used was also cross-referenced with information from another database of natural disasters, of hydro-geomorphological origin, with a view to their validation.
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