Data From Post-Flood Surveys And Field Observations For Recent Events In Italy (2011-2024)

The APPARE Project (financed by a cascade call issued by the “Multi-Risk sciEnce for resilienT commUnities undeR a changiNg climate (RETURN)” project , funded in the frame of Italy’s recovery and resilience plan (PNRR) of Next Generation Europe) focuses on the documentation of flash floods in mountainous and hilly catchments. One of the objectives of the APPARE project is the collection and a structured reanalysis of data on flash floods in Italy for which CNR-IRPI (often in collaboration with other institutions) carried out post-flood surveys. The dataset comprises historical records (2011-2022) and recent floods (2023-2024), documented through Intensive Post-Event Campaigns (IPECs) (Bonnifait et al., 2009). Data was gathered following standardized field protocols, utilizing the Manning-Strickler slope-conveyance method (Gaume and Borga, 2008), which involves surveying at least one cross-section per event and identifying flood marks to calculate peak discharge values in ungauged channels, supported by geomorphological surveys to document channel and slope changes. The data of the flash floods have been organized into a dataset listing the information collected for each channel cross-section where the flood peak discharge has been estimated. Key variables collected include mean flow velocity, channel slope, peak discharge values, geomorphic effects assessments, and Froude number, which are crucial for evaluating flood dynamics in ungauged catchments. One of the objectives of the APPARE project is also to facilitate the search, visualisation, analysis, and reuse of data collected and produced during the project via web interfaces and interoperable services. For this purpose, a geospatial infrastructure has been designed and implemented including: • a QGIS Server, creating interoperable geospatial services through an easy-to-use integration with the desktop application QGIS; • a LizMap web client, to navigate, visualize and interact via web browser with the services provided by QGIS Server; • a Postgres/PostGis database for geospatial data management; • an OwnCloud storage system to manage additional information integrated with other datasets (e.g. images and documentation related to surveys). The spatial infrastructure acts as a WebGIS interface where project partners and general users can dynamically interact with the information collected or organised by the project.