Access to data is based on a principle of full, open and free access as established by the Copernicus data and information policy Regulation (EU) No 1159/2013 of 12 July 2013. This regulation establishes registration and licensing conditions for GMES/Copernicus users.

Free, full and open access to this data set is made on the conditions that:

1. When distributing or communicating Copernicus dedicated data and Copernicus service information to the public, users shall inform the public of the source of that data and information.

2. Users shall make sure not to convey the impression to the public that the user's activities are officially endorsed by the Union.

3. Where that data or information has been adapted or modified, the user shall clearly state this.

4. The data remain the sole property of the European Union. Any information and data produced in the framework of the action shall be the sole property of the European Union. Any communication and publication by the beneficiary shall acknowledge that the data were produced “with funding by the European Union”.

Space imagery SP05 (resolution 2.5 m) and SP06 (resolution 2.5 m), space imagery IMAGE2009 (resolution 20 m), EEA member countries WFD reporting data on water bodies: for Türkiye (EEA member), Albania, Bosnia-Herzegovina, North Macedonia, Montenegro, Kosovo (UNSCR 1244/99) and Serbia (all EEA cooperating countries) no spatial data for any category of water bodies was available, European Catchments and Rivers Network System (ECRINS); ancillary data: European Lakes and Reservoirs database (Eldred), Russian topographic maps. The upgrade of the EU-Hydro beta version includes improvements of the usability of the dataset, of its topological and logical consistency and the River network characteristics. Catchments layers were also modified to fit the River networks. Topological overlapping and gaps between River Basin Districts were corrected. The EU-Hydro V1.1 upgrade includes the reclassification of polygons between InlandWater, Coastal-p, Transit_p and River_Net_p classes, the upgrade of the WFD codes using the WISE geospatial dataset for these feature classes, the improvement of logical consistency of attribute tables (deletion of irrelevant fields, recalculation of OBJECT_ID field, recalculation of geometry properties field). In Version 1.2 the Drainage network derived from EUDEM was incorporated to the river network of EU hydro: four feature classes were generated: River_Net_l_DN, Canals_l_DN, Ditches_l_DN and Nodes_DN. River names were updated using WISE geospatial database, except for Thames, Tweed and Türkiye where ECRINS was used instead. In version 1.3, "River_Net_l" topology was adjusted to fit Coastal_p and Transit_p: polylines were deleted for Gota, Skjern, Shannon, Tweed. Polylines were added in Skjern, Mesima and Tajo on areas overlapping Transit_p. Nodes were modified accordingly. CUM_LEN, LONGPATH, LENGTH GEO fields were recalculated.

More information about the product is available with the dataset in the user manual, also available at the CLMS website: https://land.copernicus.eu/user-corner/technical-library/eu-hydro_user_guide.pdf.