Risk of Flooding from Surface Water Depth: 0.1% Annual Chance Flood Map for the UK

A GIS layer showing the maximum depth of flooding from surface water that could result from a flood with a 0.1% chance of happening in any given year, produced by the UK Environment Agency. The flood depth is grouped into 6 bands and is one output of the Risk of Flooding from Surface Water (RoFSW) mapping, previously known as the updated Flood Map for Surface Water. This record has been retired and superseded by a newer version.

Use Cases

• Regional flood risk assessment based on maximum flood depth bands.
• High-level land-use planning based on indicative surface water flood extents.
• Integrating into broader environmental hazard models based on the RoFSW mapping methodology.

Strengths

• Flood depth is categorized into 6 distinct bands for analysis.
• Based on a defined 0.1% annual chance flood probability event.
• Produced by the UK Environment Agency with contributions from several authoritative organizations.

Limitations

• The dataset is not suitable for property-level assessment.
• The description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.

Provenance

Source

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

Collection Method

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

Freshness

Last updated 2026-07-06 07:17:17.325493; freshness should be verified as the record is retired.

Geography

United Kingdom (implied by data sources and platform).