dataset · Wales
Flood Alert Areas
Flood Alert Areas are geographical areas where it is possible for flooding to occur from rivers or the sea. A single Flood Alert Area may cover the floodplain within the Flood Warning Service Limit of multiple catchments of similar characteristics containing a number of Flood Warning Areas. A Flood Alert Area may also match that of a corresponding Flood Warning Area and warn for the possibility of flooding in that area. In some coastal locations a Flood Alert may be issued for spray or overtoppi
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Licence: ["There are no access restrictions on this data. NRW may release, publish or disseminate it freely.", "\u00a9 CNC/NRW All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number
Evidence quality: 47.9
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
- Flood Alert Areas (geographical areas where flooding from rivers or the sea is possible) · Web mapping service (online viewable version) · Data download
- Coverage docs-verified
- Wales (extent lat 51.240829 to 53.513067, lon -5.777741 to -2.608865)
- Update frequency docs-verified
- quarterly
- Access docs-verified
- Free and open: no access restrictions; NRW may release, publish or disseminate freely. Licence text in ENTRY reads '© CNC/NRW All rights Reserved. Contains Ordnance Survey Data.'
Useful for
- Use cases llm-inferred
- Flood risk screening: identify which Flood Alert Areas cover a Welsh site for river and sea flood context · Planning and FRA context notes listing the flood alert area and its publisher for a project location · GIS mapping of flood alert coverage across a catchment or study area
- Audience llm-inferred
- flood consultants · hydrologists · planners · GIS analysts
Limitations
- Constraints llm-inferred
- Defines areas where flooding is possible; it is not a flood extent, depth or hazard model (inferred from the summary wording) · Updated quarterly, so it may not reflect recent changes to alert areas · Extent can be shaped by practical and administrative factors, and some coastal areas are defined by a stretch of coastline · Covers Wales only (bounding box), not England or Scotland · Licence wording in ENTRY ('All rights Reserved') differs from the docs' open-access statement; confirm terms before redistribution · No API or MCP tools listed; download data formats are not stated in the docs
Evidence
- https://datamap.gov.wales/layers/inspire-nrw:NRW_FLOOD_WATCH_AREAS
- https://www.data.gov.uk/dataset/7e8c4ffb-6c3c-49ca-9e88-df3f4deb6e85/flood-alert-areas10
Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.