dataset · England
Risk of Flooding from Surface Water - Climate Change 1
Risk of Flooding from Surface Water (RoFSW) map is an assessment of where surface water flooding may occur when rainwater does not drain away through the normal drainage systems or soak into the ground, but lies on or flows over the ground instead. It is produced using national scale modelling and enhanced with compatible, locally produced modelling from lead local flood authorities (LLFAs). The RoFSW datasets include information about flooding extents, depths, speed and hazards. This dataset sh
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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: 54.2
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
- surface water flood extent · surface water flood depth thresholds: 0 m (extent), 0.2 m, 0.3 m, 0.6 m, 0.9 m, 1.2 m · surface water flood likelihood bands (High, Medium, Low)
- Coverage docs-verified
- England (extent: lat 49.943° to 55.816°, lon -6.236° to 2.072°) · 2050s epoch (2040-2060) climate change allowance; dataset reference dates 2024-10-30 (creation), 2025-01-28 (publication), 2025-09-17 (revision)
- Update frequency docs-verified
- as needed (metadata: asNeeded)
- Formats docs-verified
- WMS · layer file (.lyr) · PDF (product description) · download by area of interest (file format not stated)
- Access docs-verified
- free and open; no public access constraints; Open Government Licence v3.0
Useful for
- Use cases llm-inferred
- surface water flood screening of development sites in England, including extent and depth thresholds for FRA and drainage constraints · 2050s climate-change sensitivity check of site layouts and drainage strategies against surface water flood depths · GIS constraint mapping for early masterplanning and site selection
- Audience llm-inferred
- flood consultants · drainage engineers · civils engineers · planners · GIS analysts
Limitations
- Constraints docs-verified
- probabilistic product showing overall risk, not a specific event or scenario · contains extents and depths only; speed and hazard layers are not in this dataset · climate change allowance is the 'Central' 2050s (2040-2060) allowance only · preview only at certain zoom levels; WMS set to the 1:50 000 scale range
Evidence
- https://environment.data.gov.uk/api/file/download?fileDataSetId=b7f5e07b-e9d2-4434-8c55-8df3d8d5c621&fileName=RoFSW Product Description.pdf
- https://www.data.gov.uk/dataset/ca2b02ce-3115-4949-94ce-592bdbb9c717/risk-of-flooding-from-surface-water-climate-change-1
Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.