UK Flood Risk from Surface Water Depth at 3.3% Annual Chance

Environment Agency data shows the maximum depth of flooding from surface water with a 3.3% annual probability. The GIS layer groups flood depth into 6 bands and is part of the Risk of Flooding from Surface Water (RoFSW) mapping. This record was retired and superseded by a newer version as of the last update in July 2026.

Use Cases

• Regional flood hazard assessment based on maximum flood depth bands.
• Land-use planning for flood-prone areas based on indicative surface water flood maps.
• Supporting studies for environmental impact assessments using the 3.3% annual chance flood scenario.

Strengths

• Flood depth is categorized into 6 distinct bands for analysis.
• Based on a defined 3.3% annual chance flood probability scenario.
• Produced by the UK Environment Agency with contributions from recognized institutions like the Centre for Ecology & Hydrology.

Limitations

• The dataset is explicitly not suitable for identifying flooding at individual property levels.
• Description metadata is limited; actual data quality requires manual inspection after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Environment Agency, UK, with spatial data licensed from the Centre for Ecology & Hydrology (NERC).

Collection Method

Output of Risk of Flooding from Surface Water (RoFSW) mapping, previously known as the updated Flood Map for Surface Water.

Freshness

Last updated 2026-07-06 07:17:19.345451; freshness should be verified as the record is retired.

Geography

United Kingdom (implied by the 'uk_data' platform and originating agencies).