Dataset of flooded underpasses on Italy's urban road networks in the last 80 years.

In the context of increasing urbanization and the rising frequency of extreme climate events and floods, there is a notable absence of a comprehensive Italian cadastre of underpasses, which would be useful for land management and mitigating flood-related damages, as confirmed by the research conducted. The data collection process, which lasted 24 months, primarily relied on sources such as newspapers, online news media, social media, and both published and unpublished studies from the Research Institute for Geo-Hydrological Protection (CNR-IRPI) of the Italian National Research Council. The data were then geolocated within a dedicated GIS project (qGIS version 3.36.2). In addition, various metadata were collected, including information on the presence of warning systems, the number of vehicles and individuals involved, and their actions when facing a flooded underpass. The dataset encompasses 1439 events from 1942 to 2023.