Hydrionis for government and regulators
A single evidence base that crosses the boundaries between publishers, with the reporting basis of each figure preserved rather than flattened into a comparison that does not hold.
What you can answer here
How does our jurisdiction compare, honestly?
Comparisons that state their own limits: reporting years, definitions and collection bases differ between countries, and Hydrionis records those differences alongside the figures.
Where it stops: Hydrionis will not rank countries on a metric whose comparability notes say the ranking would be misleading.
What water data is actually published in our area, and on what terms?
The source registry, which records for every publisher what it publishes, at what resolution, over what period, in what format, and — separately — whether it permits display, derivation, redistribution and commercial reuse, with the date each position was last checked. For some teams this register is more useful than the observations: it is a map of what open water data lawfully exists.
Where it stops: The register covers sources Hydrionis has assessed, which is a large sample rather than a census. A publisher absent from it has not been ruled out; it has not been reached.
Where is the evidence base missing, and what would it take to close it?
A published acquisition backlog: what Hydrionis does not hold, what each absence costs, and the specific candidate sources for each — including the ones assessed and refused, with the reason. Several are refused because the authoritative record is prose in a PDF, which is a policy problem rather than a technical one.
Where it stops: A gap is evidenced from what Hydrionis holds rather than from a survey of what exists, so the backlog describes the boundary of this platform rather than the boundary of published water data.
Relevant datasets
| Dataset | Observations | Coverage | Licence |
|---|---|---|---|
| England River Water Quality Dataset | 748,160 | 2000–2025 | Commercial use permitted |
| Global Water Resources and Withdrawal Dataset | 50,363 | 1961–2022 | Commercial use permitted |
Key measures
Full dictionary →| Measure | Definition | Unit |
|---|---|---|
| Water stress | Freshwater withdrawal as a percentage of available renewable freshwater resources, after accounting for environmental flow requirements. | % |