Coastal Flood Maps: UK Flood Extent and Depth for 10, 200, and 1000-Year Return Periods

Coastal flood hazard maps showing flood extent and depth for three probability levels. The data includes a high-probability 10-year return period, a medium-probability 200-year return period, and a low-probability 1000-year return period plus a 200-year climate change scenario for the 2080s. The maps were produced by the Government Digital Service using the UK Climate Projections 2009 (UKCP09) high emissions scenario.

Use Cases

• Modeling property-level flood risk based on flood extent and depth maps.
• Assessing long-term climate change impacts on coastal infrastructure using the 2080s high emissions scenario.
• Informing land-use and development policies based on flood probabilities aligned with Scottish Planning Policy.
• Calibrating hydrological models with observed event data reflected in the high-probability 10-year return period maps.

Strengths

• Includes three distinct flood probability scenarios (10, 200, and 1000-year return periods).
• Integrates a specific climate change projection (UKCP09 high emissions 95%ile for the 2080s).
• Maps show both flood extent and, where appropriate, flood depth.
• Scenarios are defined for policy consistency, with the high probability reflective of observed recent events.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and dataset size are unknown, which may limit suitability assessment.
• Last update date is unknown; freshness unverified.

Provenance

Source

Government Digital Service

Collection Method

Likely derived from hydrological modeling and UKCP09 climate projections.

Time Range

Includes projections for the 2080s.

Freshness

Last updated date is unknown.

Geography

Covers coastal areas, likely within the United Kingdom, given the reference to UKCP09 and Scottish Planning Policy.