dataset · Wales
Recorded Flood Extents
Recorded Flood Extents shows areas that have been recorded to have flooded in the past from rivers, the sea or surface water. The records come from a number of evidence sources including Natural Resources Wales, its predecessors or other Risk Management Authorities. It is possible that the pattern of flooding in an area may have changed and would now flood under different circumstances. In addition, the absence of a recorded flood extent does not mean that the area has never flooded, only that w
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Licence: ["There are no access restrictions on this data. NRW may release, publish or disseminate it freely.", "\u00a9 CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is
Evidence quality: 55.6
Listed in data.gov.uk public catalogue API on 2026-10-16; relevance/value screened (haiku).
Metadata checked: 2026-10-14T13:20:00.000Z
What's in it
- Data offered docs-verified
- recorded past flood extents from rivers, the sea or surface water
- Coverage docs-verified
- Wales (bounding box: latitude 51.240829 to 53.513067, longitude -5.777741 to -2.608865)
- Update frequency docs-verified
- biannually
- Access docs-verified
- free/open, no access restrictions; Open Government Licence v3.0 per entry licence; delivered as web service and download
Useful for
- Use cases llm-inferred
- FRA baseline: check whether a Welsh site or catchment has recorded past flooding from rivers, the sea or surface water · Drainage strategy screening: identify areas of recorded surface water flooding in Wales · Planning constraints screening: flag recorded flood history for development sites in Wales
- Audience llm-inferred
- flood consultants · drainage engineers · hydrologists · planners · GIS analysts
Limitations
- Constraints docs-verified
- absence of a recorded extent does not mean the area has never flooded, only that no current records exist · flooding pattern may have changed, so past extents may not reflect current flood behaviour
Evidence
- https://datamap.gov.wales/layers/inspire-nrw:NRW_HISTORIC_FLOODMAP
- https://www.data.gov.uk/dataset/79366886-4e80-4b02-8691-f1a00ae44e11/recorded-flood-extents2
Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.