UK Flood Risk from Surface Water at 3.3% Annual Chance

Environment Agency mapping shows the indicative extent of surface water flooding with a 3.3% annual probability. This dataset is part of the Risk of Flooding from Surface Water (RoFSW) mapping, previously known as the updated Flood Map for Surface Water. The record was retired and superseded by a newer version in 2026.

Use Cases

• Regional flood hazard assessment based on the 3.3% annual chance flood extent.
• Land-use planning for surface water flood risk based on indicative mapping.
• Supporting broader environmental studies with geospatial flood data from the RoFSW mapping.

Strengths

• Based on multi-source spatial data from the UK Environment Agency, Centre for Ecology & Hydrology, and Ordnance Survey.
• Provides a specific, standardized flood probability (3.3% annual chance) for analysis.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Row count is unknown, which may limit suitability assessment.
• Explicitly not suitable for property-level assessment or as sole evidence for planning decisions.

Provenance

Source

Environment Agency (UK), with data licensed from Centre for Ecology & Hydrology, Defra, Met Office, and others.

Collection Method

Likely produced through hydrological modeling and spatial analysis as part of the Risk of Flooding from Surface Water (RoFSW) mapping.

Freshness

Last updated 2026-07-06 07:17:28.467866; freshness should be verified.

Geography

United Kingdom