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Integrated Hydrological Units of the United Kingdom: Sections

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. A Section is the drainage area of a watercourse between two confluences. Only confluences of named watercourses were considered. Each Section carries a name constructed from names of the major river flowing through the Section, the major river flowing into the Section, and the major river into whic

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What's in it

Data offered docs-verified
IHU Section geometries (drainage area of a watercourse between two confluences) · Section-to-catchment association (catchment upstream of Section outlet) · Identifiers and attributes for direct upstream and downstream IHU units
Coverage docs-verified
Great Britain (England, Scotland, Wales); Northern Ireland not included · 2014-08-20 to …
Formats docs-verified
File geodatabase (gdb) · WMS
Access docs-verified
Whole-dataset zip download and WMS access; licence terms and conditions apply (catalogue licence: Non-Open Government Licence). No authentication stated in the docs.

Useful for

Use cases llm-inferred
Identify direct upstream and downstream IHU Sections for a site or gauge to support FRA baseline flow assessment · Map Section and catchment boundaries to link ungauged sites to nearby river reaches · Provide hydrological reference units in GIS for catchment and drainage area mapping
Audience llm-inferred
flood consultants · hydrologists · drainage engineers · GIS analysts

Limitations

Constraints llm-inferred
Great Britain only; no Northern Ireland coverage · Only confluences of named watercourses were considered, so unnamed tributaries are not split out · Licence terms and conditions apply, which may restrict redistribution · File geodatabase format needs GIS software that reads .gdb (e.g. ArcGIS, GDAL)
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)