UK Flood Risk Extents for 3.3% Annual Exceedance Probability

UK land areas at risk of flooding from rivers and the sea under a 3.3% annual exceedance probability scenario, assuming flood defences function as designed. The dataset is produced by the Environment Agency and was last updated in May 2026. It is intended for area-level risk indication, not for assessing risk to individual properties.

Use Cases

• Regional flood hazard mapping based on defended flood risk extents.
• Land-use planning and zoning based on area-level flood risk probability.
• Environmental impact assessment for infrastructure projects based on flood risk zones.

Strengths

• Defined to a specific 3.3% annual exceedance probability (1 in 30 year chance).
• Explicitly models defended flood risk, accounting for intended flood defence operations.
• Produced by the authoritative Environment Agency for the UK.

Limitations

• Does not include flood depth, speed, or volume of flow information.
• Not suitable for assessing risk to individual properties, as stated in the description.
• Column-level documentation is absent; field semantics must be inferred after download.

Provenance

Source

Environment Agency

Collection Method

Environmental modelling of defended flood risk extents.

Time Range

Present day

Freshness

Last updated 2026-05-29 14:39:18.628929

Geography

United Kingdom