dataset · Wales

National Coastal Erosion Risk Management (NCERM)

The National Coastal Erosion Risk Management (NCERM) map shows the spatial NCERM coastal baseline. This baseline is split to 'frontages'. These are defined as lengths of coast with consistent characteristics based on the cliff behaviour characteristics and the defence characteristics. It is intended as an up-to-date and reliable benchmark dataset showing erosion extents and rates for three periods from a base date of 2005: - Short Term (0 - 20yr i.e. 2005 to 2025); - Medium Term (20 - 50yr i.e.

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Source details

Licence: ["There are no access restrictions on this data. NRW may release, publish or disseminate it freely.", "\u00a9 CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is

Evidence quality: 51.4

Listed in data.gov.uk public catalogue API on 2026-10-16; relevance/value screened (haiku).

Metadata checked: 2026-10-14T13:20:00.000Z

What's in it

Data offered docs-verified: coastal erosion extents (cumulative metres) per frontage · coastal erosion rates · defence type per period · SMP2 policy per period · 5-95%ile confidence range in attributes
Coverage docs-verified: Wales coastline (bounding box lat 51.24 to 53.51, lon -5.78 to -2.61) · 2005 to 2105 (baseline 2005; short, medium and long-term periods)
Resolution llm-inferred: Frontage-level: coast split into frontages of consistent cliff and defence characteristics; no numeric resolution stated
Update frequency docs-verified: Not planned (no scheduled updates); last updated 16 September 2026
Formats docs-verified: WMS
Access docs-verified: Free and open; no access restrictions, re-use under Open Government Licence v3.0

Useful for

Use cases llm-inferred: Screening coastal erosion exposure for Welsh site and development appraisals using the 2025 short-term extents · Long-term (2105) erosion setback context for coastal flood and erosion risk assessments · Checking SMP2 policy and defence type along a frontage for shoreline management and planning inputs
Audience llm-inferred: coastal engineers · flood risk consultants · planners · GIS analysts

Limitations

Constraints llm-inferred: Extents are based on 50%ile confidence; the 5-95%ile range is only in the attributes · Results are scenario-dependent (no active intervention vs SMP2 policies) · Wales only · No scheduled updates, so maintenance risk over time · Download format is not stated; only WMS is listed in the docs · Dataset reference date (2023-06-29) predates the 2026 update

Evidence

Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.