One of the many changes with the release of EFASv5.0 is the increased spatial resolution from 5-km to 1 arcmin /0.0167 degrees resolution (~1.4km)
One of the many changes with the release of EFASv5.0 is the increased spatial resolution from 5-km to 1 arcmin /0.0167 degrees resolution (~1.4km)

The European Flood Awareness System (EFAS) version 5.0 is due for pre-release on the EFAS stage platform on the 02 August 2023.

EFAS v5.0 introduces several major changes to the system, including:

  • A higher spatial resolution. EFAS v5.0 has a 1 arcmin / 0.0167 degrees resolution (~1.4km), as opposed to the 5-km resolution of all the previous EFAS versions.

  • A different projection system, now based on EPSG:4326 instead of ETRS89 Lambert Azimuthal Equal Area Coordinate Reference System (ETRS-LAEA) for previous versions.

  • A larger modelling domain whose extension has been enlarged to match the river catchments. 

  • An entirely new set of 0.0167 degrees resolution input maps produced using the most recent research findings, remote sensing, and in-situ datasets.

  • Major improvements to the open-source hydrological model LISFLOOD.

  • A new calibration at 1903 in-situ gauging stations. Furthermore, a parameter regionalisation was performed to estimate the parameters of catchments for which in situ discharge observations were not available.

This upgrade of EFAS has large impacts on the EFAS modelling results.

All EFAS users can access the pre-release of version 5.0 through the EFAS stage platform with their EFAS user accounts as of 2 August 2023.

Please be aware that EFAS v5.0 data should be considered as experimental until the official cycle release date. The preliminary date for the operational release of EFAS v5.0 is 20 September 2023.

For more information about the latest operational EFAS release and previous versions of EFAS, we refer users to the dedicated wiki pages. Detailed information about EFAS v5.0 is available starting from the pre-release date; these pages will be updated until the operational release. Data will be accessible following the operational release and information will be provided through our dedicated wiki page on data access.

As always, we invite your feedback on the pre-release of EFASv5.0. Questions and feedback can be addressed to the CEMS Floods team via the EFAS contact form.