dataset · United Kingdom
Government / regulator
Integrated Hydrological Units of the United Kingdom View Service
This is a web map view service for the Integrated Hydrological Units (IHU) of the United Kingdom. The IHU define geographical reference units for hydrological purposes including river flow measurement and hydrometric data collection in the UK. The layers in this service represent the following component polygon layers: Hydrometric Areas with Coastline; Hydrometric Areas without Coastline; Groups; Sections; and Catchments. Each layer represents a different level of spatial detail. The coarsest le
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What's in it
- Data offered docs-verified
- Hydrometric Areas with Coastline · Hydrometric Areas without Coastline · Groups · Sections · Catchments
- Coverage docs-verified
- Great Britain (all layers); Great Britain and Northern Ireland (Hydrometric Areas with Coastline only)
- Resolution docs-verified
- Hierarchical polygon levels of increasing spatial detail: Hydrometric Areas (coarsest, two versions), Groups, Sections, and Catchments (upstream area of each Section outlet)
- Formats docs-verified
- WMS · JPEG · PNG · TIFF
- Access docs-verified
- Licence terms apply (ENTRY licence: Non-Open government licence); accessed as a WMS for use in a GIS application; no authentication listed; citation required in publications
Useful for
- Use cases llm-inferred
- Identify the hydrometric Group and Section containing a site to shortlist nearby gauges for FRA baseline flow work · Overlay Catchment polygons in a GIS to confirm the upstream area draining to a watercourse outlet for flood or drainage inputs · Map Hydrometric Areas and Groups as regional context on water and environmental consultancy figures
- Audience llm-inferred
- hydrologists · flood consultants · drainage engineers · GIS analysts
Limitations
- Constraints docs-verified
- Northern Ireland is covered only by the Hydrometric Areas with Coastline layer; other layers are Great Britain only · View (WMS) service rather than a documented data download; the docs describe map access only · Catchments polygons overlap, unlike the other layers · Non-Open government licence with terms and conditions to be checked before use · No time span or update frequency is stated in the docs
- 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)