Coverage and gaps
Coverage across countries is genuinely uneven, and pretending otherwise would be the single most misleading thing this site could do. This page reports what Hydrionis holds, what it does not, and where the thin areas are.
What Hydrionis contains
| Observations | 22,421,497 | Each resolving to a registered source. A value without one fails the build. |
|---|---|---|
| Of which computed by Hydrionis | 49,588 | Each carrying its method, version and the identifier of every input observation. |
| Distinct series | 43,061 | One metric, one subject, one period resolution. |
| Monitoring locations | 14,395 | River gauges, boreholes and sampling points. These carry most of the depth and, deliberately, none of the URLs. |
| Geographies | 14,919 | Administrative, operational and hydrological units in one tree. |
| Entities | 1,097 | Including 28 utilities, 12 rivers, 5 reservoirs and 20 recorded events. |
| Registered sources | 201 | From 176 distinct publishing organisations. |
| Automated pipelines | 21 | Everything else was entered by hand from a published document and does not refresh on its own. |
Geographical coverage
View the data behind this chart
| Countries and territories in the registry | 205 |
|---|---|
| With at least one core indicator | 199 |
| With all nine | 1 |
| With none | 6 |
| Mean core coverage | 74.4% |
Temporal coverage
Observations by domain
| Domain | Observations | Share |
|---|---|---|
| river-flow | 21,232,530 | 94.7% |
| groundwater | 480,794 | 2.1% |
| quality | 183,639 | 0.8% |
| precipitation | 173,335 | 0.8% |
| temperature | 113,696 | 0.5% |
| chemistry | 71,802 | 0.3% |
| reservoir | 54,832 | 0.2% |
| sector-use | 33,245 | 0.1% |
| resources | 22,577 | 0.1% |
| abstraction | 15,378 | 0.1% |
| access | 9,150 | 0.0% |
| drinking-water | 6,999 | 0.0% |
| withdrawal | 6,780 | 0.0% |
| stress | 6,672 | 0.0% |
| sanitation | 3,781 | 0.0% |
| utility-performance | 2,989 | 0.0% |
| leakage | 1,173 | 0.0% |
| tariff | 1,077 | 0.0% |
| infrastructure | 1,043 | 0.0% |
| wastewater | 5 | 0.0% |
Rights composition
What Hydrionis is legally able to do with what it holds. These are properties of the publishers’ licences, not of any Hydrionis decision.
| Observations that may be redistributed | 100.0% |
|---|---|
| Observations that may be used commercially | 100.0% |
| Source registry that is free or open | 98.5% |
| Licence class | Sources |
|---|---|
| Open — attribution required | 106 |
| Public but restricted | 67 |
| Open | 22 |
| Permission required | 4 |
| Proprietary / paid | 2 |
Where Hydrionis is weak
Metrics defined but not populated
81 of 155 metrics carry values. The remaining 74 are defined and empty. They are listed rather than hidden, because a registry showing only what exists implies the rest was never considered.
Geographical concentration
The station-level record is English only. The Environment Agency regulates England; Scotland, Wales and Northern Ireland have their own agencies and their own archives, which are not yet ingested. Outside the UK, coverage is national annual statistics.
Domains with thin coverage
Utility performance, leakage, tariffs and wastewater are held as recent regulatory reporting rather than long series. Reservoir storage, soil moisture and abstraction licensing are not ingested. Drinking-water compliance is held at the level of published summaries rather than zone-level results.
What is not published anywhere
Some things a reader reasonably wants are not open data at all: facility-level water consumption, most industrial abstraction volumes, and network condition. Hydrionis holds none of these and does not estimate them. Anyone publishing them at scale is modelling, and a model is not an observation.
Update frequency
The 21 automated pipelines re-fetch from their publishers and are idempotent: re-running creates nothing new unless the publisher changed something. What each run did, and what it refused to store, is reported on the ingestion diagnostics page. Values that a publisher has since revised are retained in the Vault rather than overwritten.