Coastal Flood Boundary Extreme Sea Levels for Northern Ireland (2018)

Extreme sea level values for 16 different annual probabilities of exceedance, including confidence bounds, for the Northern Ireland coastline under 2018 conditions. The dataset was produced by a UK partnership including the Environment Agency, SEPA, NRW, and DfINI, and is provided as a GIS layer reprojected to Irish Grid. It does not account for future climate change effects like sea level rise.

Use Cases

• Modeling coastal flood boundaries based on extreme sea level probabilities.
• Assessing flood risk for strategic planning using confidence bounds for sea level estimates.
• Informing coastal engineering design with predicted tide levels like MHWS and HAT.
• Creating flood hazard maps for Northern Ireland using the provided GIS data.

Strengths

• Includes data for 16 distinct annual probabilities of exceedance.
• Provides confidence levels for the 5% and 95% lower and upper bounds.
• Contains predicted tide levels such as Mean High Water Spring (MHWS) and Highest Astronomical Tide (HAT) for some sites.
• Produced by a formal UK partnership of environmental agencies.

Limitations

• Data reflects 2018 conditions and does not account for future climate change or sea level rise.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and file formats are unknown, which may limit suitability assessment.

Provenance

Source

UK Coastal Flood Forecasting partnership (EA, SEPA, NRW, DfINI)

Collection Method

Specialist GIS dataset creation as part of the Coastal Design/Extreme Sea Levels project.

Time Range

Present day conditions for the year 2018.

Freshness

Last updated 2026-07-08 13:32:21.595277; freshness should be verified.

Geography

Northern Ireland coastline, extracted from a UK-wide dataset and reprojected to Irish Grid.