dataset · England
Rivers and Sea defended and undefended flood risk depths – present day
Please note: this data is currently produced for areas where our Flood Zones datasets are based on national modelling. Areas where depth data is currently unavailable in this dataset are indicated using the Unavailable attribute. These datasets show the depth of flooding from rivers and sea for the following annual exceedance probabilities or chance of flooding each year: ● Undefended: 0.1% AEP (1 in 1000) Rivers/Sea ● Undefended: 1% AEP (1 in 100) Rivers/ 0.5% (1 in 200) Sea ● Defended: 0.1% AE
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Licence: ["There are no public access constraints to this data. Use of this data is subject to the licence identified.", "There are no public access constraints to this data. Use of this data is subject to the
Evidence quality: 57.2
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 depth from rivers and sea · undefended depth at 0.1% AEP (1 in 1000) Rivers/Sea and 1% AEP (1 in 100) Rivers / 0.5% AEP (1 in 200) Sea · defended depth at 0.1% AEP (1 in 1000) Rivers/Sea and 1% AEP (1 in 100) Rivers / 0.5% AEP (1 in 200) Sea · depth bands: up to 150mm, 150-300mm, 300-600mm, 600-900mm, 900-1200mm, 1200-2300mm, over 2300mm
- Coverage llm-inferred
- England (ENTRY regions); DOCS extent lat 49.943 to 55.816, lon -6.236 to 2.072 · present day (dataset reference date 2026-07-06)
- Update frequency docs-verified
- as needed (metadata: asNeeded)
- Formats docs-verified
- OGC API - Features · WMS · download (format not stated) · LYRX (ArcGIS layer file) · PDF (product description)
- Access docs-verified
- free/open; Open Government Licence v3.0; no public access constraints
Useful for
- Use cases llm-inferred
- FRA screening: river and sea flood depth at 1% and 0.1% AEP, defended vs undefended, for site flood risk context · Drainage strategy: identify areas of flood depth from rivers and sea that constrain outfall and finished floor level planning · Planning constraints mapping: overlay flood depth bands on development sites or allocations for area-level risk review
- Audience llm-inferred
- flood consultants · drainage engineers · hydrologists · GIS analysts · planners
Limitations
- Constraints docs-verified
- indicative area-level flood risk only; not suitable for showing whether an individual property is at risk · depth data unavailable in some areas (Unavailable attribute); only where Flood Zones are based on national modelling · undefended products ignore the presence and condition of flood defences · defended products exclude asset failure or removal scenarios · users must check suitability for their intended use
Evidence
- https://environment.data.gov.uk/api/file/download?fileDataSetId=6bf96b5d-1e0b-4c0f-b9f1-a491bdc7dbf5&fileName=Rivers_and_Sea_Defended_and_Undefended_Depths_Product_Description.pdf
- https://www.data.gov.uk/dataset/e4698ae1-184b-4b5d-801a-90364a93e229/rivers-and-sea-defended-and-undefended-flood-risk-depths-present-day
Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.