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Integrated Hydrological Units of the United Kingdom

The Integrated Hydrological Units (IHU) of the United Kingdom (UK) define geographical reference units for hydrological purposes including river flow measurement and hydrometric data collection in the UK. The datasets in this series 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 level, Hydrometric Areas, is provided in

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What's in it

Data offered docs-verified
Hydrometric Areas with Coastline (polygons) · Hydrometric Areas without Coastline (polygons) · Groups (polygons) · Sections (polygons) · Catchments (polygons) · Hierarchy and linkage attributes for upstream/downstream and cross-layer selection
Coverage docs-verified
Great Britain (Hydrometric Areas with Coastline also covers Northern Ireland)
Resolution docs-verified
Vector polygons at multiple hierarchical levels: Hydrometric Areas (coarsest), then Groups, Sections and Catchments; no numeric scale stated
Access llm-inferred
Non-Open Government Licence (per entry metadata); no authentication listed

Useful for

Use cases llm-inferred
FRA baseline flows: locate the Section and upstream Catchment containing a site to identify the relevant gauge and drainage area · Drainage strategy: derive upstream catchment area for a watercourse outfall or discharge point · Hydrometric Area and Group lookup to give river flow data context for a project location
Audience llm-inferred
hydrologists · flood consultants · GIS analysts · drainage engineers

Limitations

Constraints docs-verified
Groups, Sections and Catchments cover Great Britain only; no Northern Ireland coverage in those layers · Non-Open Government Licence: check terms before redistribution · Catchments layer polygons overlap by design, unlike other layers
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)