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Table of Contents

Background to EFAS SOS

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EFAS SOS is a web API for retrieving EFAS forecasts as data. The API returns an xml file. Example api requests can be found on the SOS services's web page. Note that in order to download recent forecasts, EFAS SOS credentials are required. These can be requested from the EFAS project.

Within EFAS version 4.0, four streamflow forecast products are produced. These are listed in below table which includes various characteristics that are relevant for the configuration of the present Delft-FEWS import. All forecasts are available at a 6-hour time step. Note that the composition of products and their characteristics may change with future EFAS versions.

ForcingTypeEnsemble rangeprocedure
DWD ICONdeterministic
eud

dwd_lisflood
COSMO-LEPSensemble1 - 20cos_lisflood
ECMWF-HRESdeterministic
eud_lisflood
ECMWF-ENSensemble1 - 50eue_lisflood

The Delft-FEWS import

The European Flood Awareness System(EFAS) Sensor Observation Service(SOS) import function (<importType>EfasSosServer</importType>) imports XML files from throughthe EFAS SOS API. The time0 of the workflow task will be used to identify which forecast is requested.

Warning
titleWarning
  • At times, the EFAS SOS API

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  • server response can be very slow. This may cause the import to take long, or even a time-out of the Delft-FEWS import.
  • EFAS SOS time-outs happen frequently.
  • We found that the EFAS SOS service isn't always updated with new data very quickly; most recent data in EFAS-IS may take a few hours to find its way to the EFAS SOS service.
  • Consecutive data requests from the same browser or from the same Delft-FEWS application may result in data requests to be denied

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Example import module xml file

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