dataset · United Kingdom
Government / regulator
Integrated Hydrological Units of the United Kingdom: Groups
This dataset is part of Integrated Hydrological Units (IHU) of the UK, a set of geographical reference units for hydrological purposes including river flow measurement and hydrometric data collection. Groups represent the intermediate units of IHU in terms of spatial resolution. The most common size of a group is around 400 square kilometres. Each Group carries a name constructed from names of the major river flowing through the Group, the major river flowing into the Group, the major river into
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What's in it
- Data offered docs-verified
- IHU Group boundary polygons (intermediate hydrological reference units) · Group names · Upstream and downstream IHU unit identifiers and attributes
- Coverage docs-verified
- Great Britain only (Northern Ireland not covered) · 2014-08-20 to open-ended (…)
- Resolution docs-verified
- Intermediate spatial unit; most common Group size around 400 square kilometres
- Formats docs-verified
- File geodatabase (gdb) · WMS (web map service)
- Access docs-verified
- Whole-dataset zip download and WMS access; licence terms and conditions apply (Non-Open Government Licence per entry metadata)
Useful for
- Use cases llm-inferred
- Assign a site or gauge to its IHU Group as a catchment reference unit · Identify upstream and downstream IHU units for flow-routing context in an FRA · Map GB hydrological reference units for regional water-resources or drainage screening
- Audience llm-inferred
- hydrologists · flood consultants · GIS analysts · water resources engineers
Limitations
- Constraints llm-inferred
- Great Britain only; no Northern Ireland coverage · Non-open licence: licence terms and conditions apply · Group names partly edited manually, so naming is not fully systematic · Units are reference boundaries, not flow or level data
- Licence
- Non-Open government licence
- Authentication
- Unknown — review source docs
- GitHub stars
- Unknown
- Last commit
- Unknown
- Last successful page check
- 16/10/2026
- Page health
- healthy
- Package
- Not recorded
- Verification
- Not independently verified
Provenance & evidence
Listed in ukceh-eidc public catalogue API on 2026-10-16; relevance/value screened (haiku).
Metadata observed 14/10/2026 · research sweep: sweep-2026-10-16 (ukceh-eidc)