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The following is a description of the latest operational release of EFAS v4 v5.50. For an overview of other EFAS releases, please see: EFAS versioning system.

Summary

EFAS v4v5.5 introduces minor 0 introduces a number of major changes to the system, as well as some general bug fixes. Here is a summary of the main changes: 

• Post-processing updates: 

• • Increase temporal resolution of bias-adjusted method (real-time hydrograph) from 24 hours to 6 hours.
  • Recalibration of all 1608 station models using the most up-to-date data available (1420 at 6-hourly, 188 at daily).
  • River discharge observations are now obtained from a new hydrological database set up by EFAS Hydrological Data Collection Centre (HYDRO)
  • Detailed documentation on the post-processing method and post-processing product (Real-time hydrograph) can be found on the dedicated wiki pages, following the release.

• Introduction of TAMIR layers:

  • Four new hourly updated flash flood products developed during the TAMIR project are now available:

    • Flash flood impact forecasts summarised at the catchment level for four lead time aggregation windows: 0-6h, 07-24h, 25 - 48h, and 49 - 120h

    • An animated layer showing flash flood impact forecasts over the river network at each timestep for lead times from 0-120h

    • Accumulated precipitation estimates for the past 24h (updated twice per day)

    • An animated layer of the 80th percentile of ensemble rainfall forecasted at each timestep for lead times from 0-120h

  • Detailed documentation on the TAMIR layers can be found on the dedicated TAMIR wiki pages, following the release. 

Technical details

, including:

• a higher spatial resolution. EFAS v5.0 has 1 arcmin/ 0.0166667 degrees resolution (~1.4km), as opposed to all the previous EFAS versions having 5-km resolution.
• a different project system, now based on EPSG4326 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 0.0166667 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, with a parameter regionalisation performed to estimate the parameters of catchments for which in situ discharge observations were not available.
• newreturn period thresholds and snow water/soil moisture anomaly maps based on a climatology from 1992 – 2022. The EFAS v5.0 river discharge climatology is available at the C3S Climate Data Store.
• updated hydrological post-processing models, recalibrated for EFAS v5.0.
• new flood hazard maps, generated using LISFLOOD-FP at 90m resolution and MERIT hydro DM and EFAS v5.0 reference dataset
• new reforecast configuration (medium-range), with the hydrological reforecast datasets being generated during the operational processing chain
• ERIC based on LISFLOOD surface runoff outputs instead of empirical relationships
• ERIC notification points and reporting points shown only for catchments below 1000km²
• additional flood event information available in the Rapid Impact Assessment pop-out table (see EFAS Rapid Flood Mapping and Rapid Impact Assessment)
• updated exposure information used in Rapid Impact Assessment (see CEMS-Flood flood impact forecasting)
• an updated major rivers layer (see Static Layers Overview)
• new rules for defining dynamic reporting points (see EFAS v5.0 - Dynamic Reporting Points)

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

Other smaller changes include the adjustment of the temperature evolution graph in the reporting point window, which was corrected to show the average temperature of the whole catchment.

Technical details