Dataset catalogue
Hydrionis publishes governed datasets, not a database dump. Each has a version, a stated methodology, an explicit licence position and a citation you can put in a footnote — and every number describing it is computed from the data itself.
Datasets
| Dataset | Observations | Coverage | Version | Licence position |
|---|---|---|---|---|
| Finland Historical River Discharge Dataset | 10,327,195 | 1847–2026 | v1.0.0 | Commercial use permitted |
| Sweden Historical River Discharge Dataset | 9,507,623 | 1851–2026 | v1.0.0 | Commercial use permitted |
| France River Flow Dataset | 643,180 | 1900–2026 | v1.0.0 | Commercial use permitted |
| Scotland Hydrology Dataset | 292,684 | 1929–2026 | v1.0.0 | Commercial use permitted |
| England River Flow Dataset | 255,737 | 1879–2026 | v1.0.0 | Commercial use permitted |
| England River Water Quality Dataset | 252,857 | 2000–2025 | v1.0.0 | Commercial use permitted |
| England Groundwater Level Dataset | 189,720 | 1836–2026 | v1.0.0 | Commercial use permitted |
| UK Historical Rainfall Dataset | 173,012 | 1836–2026 | v1.0.0 | Commercial use permitted |
| United States River Flow Dataset | 148,859 | 1874–2025 | v1.0.0 | Commercial use permitted |
| United States Reservoir Storage Dataset | 54,260 | 1914–2026 | v1.0.0 | Commercial use permitted |
| Global Water Resources and Withdrawal Dataset | 50,363 | 1961–2022 | v1.0.0 | Commercial use permitted |
| Hydrionis Gauge–Water Linkage Dataset | 49,588 | 1840–2010 | v1.0.0 | Commercial use permitted |
| Hydrionis Facility Water Relationships Dataset | 49,588 | 1840–2010 | v1.0.0 | Commercial use permitted |
| Hydrionis Derived Climatology Dataset | 49,588 | 1840–2010 | v1.0.0 | Commercial use permitted |
| Germany Federal Waterway Monitoring Dataset | 25,835 | 2026–2026 | v1.0.0 | Commercial use permitted |
| Ireland Water Level Dataset | 15,621 | 2025–2026 | v1.0.0 | Commercial use permitted |
| Hydrionis Industrial Cooling Water Dataset | 14,968 | 2014–2024 | v1.0.0 | Commercial use permitted |
| France Water Abstraction Dataset | 10,854 | 1970–2024 | v1.0.0 | Commercial use permitted |
| European Water Abstraction Dataset | 8,226 | 1970–2024 | v1.0.0 | Commercial use permitted |
| France Water Service Performance Dataset | 8,209 | 2008–2019 | v1.0.0 | Commercial use permitted |
| France Drinking Water Quality Dataset | 4,855 | 2022–2025 | v1.0.0 | Commercial use permitted |
| Poland Hydrological Observations Dataset | 1,625 | 2026–2026 | v1.0.0 | Commercial use permitted |
| England Water Company Performance Dataset | 234 | 2023–2024 | v1.0.0 | Commercial use permitted |
How to use these
Every dataset page carries a suggested citation, a changelog, the full list of contributing publishers and the limitations a professional user needs to read before relying on it. Values are available as CSV extracts and through the JSON API, and the fields are defined in the data dictionary.
Hydrionis does not silently change published data. When a method changes or a publisher revises history, the dataset version moves and the change is written into its changelog, so a figure cited six months ago can still be explained today.
For bulk extracts, higher-volume API access or commercial licensing, see data enquiries.