UK Flood Risk Extents for Present Day Defended and Undefended Scenarios

Environment Agency datasets show the extent of land at risk of flooding to defined annual exceedance probabilities for present-day conditions. The data includes four scenarios comparing defended and undefended flood extents for rivers and the sea. The datasets are not suitable for assessing risk to individual properties and do not include information on flood depth, speed, or flow volume.

Use Cases

• Model regional flood hazard exposure based on defended and undefended scenarios.
• Compare flood risk extents for different annual exceedance probabilities (e.g., 0.1% vs 1% AEP).
• Assess the theoretical impact of flood defenses based on the defended scenario extents.

Strengths

• Includes four distinct modeled scenarios for defended and undefended conditions.
• Defines specific annual exceedance probabilities (0.1% and 1% for rivers, 0.5% for sea).
• Explicitly states assumptions about defense operation in the defended scenario.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• Data is not suitable for assessing risk to individual properties as stated in the description.

Provenance

Source

Environment Agency

Time Range

Present day

Freshness

Last updated 2026-05-29 14:39:21.615236; freshness should be verified.

Geography

United Kingdom