UK Flood Risk from Surface Water: 0.1% Annual Chance Extent

UK Environment Agency data showing the indicative geographic extent of surface water flooding with a 0.1% annual probability. This dataset is part of the Risk of Flooding from Surface Water (RoFSW) mapping, superseding the updated Flood Map for Surface Water (uFMfSW). The record has been retired and superseded by a newer version.

Use Cases

• Assess regional flood hazard for strategic planning based on the 0.1% annual chance flood extent.
• Model large-scale environmental risks based on surface water flood mapping.
• Inform public awareness and emergency preparedness initiatives using indicative flood zones.

Strengths

• Produced by the UK Environment Agency, a national authoritative body.
• Based on a defined probabilistic flood model (0.1% annual chance).
• Includes detailed attribution and licensing information from multiple sources.

Limitations

• The dataset is explicitly not suitable for property-level assessment.
• Maps are indicative and not appropriate as sole evidence for specific planning decisions.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

Environment Agency (UK), with data licensed from Centre for Ecology & Hydrology (CEH), Defra, Met Office, DARD Rivers Agency, Cranfield University, James Hutton Institute, and Ordnance Survey.

Collection Method

Output from Risk of Flooding from Surface Water (RoFSW) mapping.

Freshness

Last updated 2026-07-06 07:17:26.471652; freshness should be verified as the record is retired.

Geography

United Kingdom