National Flood Hazard Maps - Climate Change
The National Flood Hazard Climate Change maps are based on generalised modelling only. These maps use the same base information as the Present Day Hazard Maps, but include an allowance for Climate Change (2120). These maps have no official status for Planning or Insurance purposes, therefore the public and professionals are advised to use the information contained within the Flood Risk Assessment Wales Map, the Development Advice Map / Flood Map for planning (as appropriate) for these purposes as these will be more up-to-date and incorporate improved modelling information.
The National Flood Hazard Map for Climate Change have been created for 3 sources of flooding, namely,
1. Flooding from Rivers
2. Flooding from the Sea
3. Flooding from Surface Water & Small Watercourses
The Maps show flood depth, velocity (speed), hazard and extent for High, Medium and Low risk scenarios with raised flood defences.
For Rivers and Surface Water & Small Watercourses, High risk is up to 1 in 30year plus climate change uplift (CC); Medium risk is between 1 in 30 plus CC and 1 in 100year plus CC and Low risk is between 1 in 100 year plus CC and 1 in 1,000year plus CC Annual Exceedance Probability (AEP).
For the Sea, High risk is up to 1 in 30 year plus CC; Medium risk is between 1 in 30 plus CC to 1 in 200 year plus CC; and Low risk 1 in 200 year plus CC to 1 in 1000 year plus CC.
The Climate Change uplift values use the “Central” estimate for the year 2120 from the Welsh Government guidance available at the time of modelling (2018).
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS161288
- Alternative Title
-
- Mapiau Perygl Llifogydd Cenedlaethol
- National Flood Hazard Maps Climate Change.lyr
- Metadata Language
- English
- Lineage
-
The datasets have been created as part of the Flood Risk Assessment Wales (FRAW) 2018 project. The modelling has been undertaken on the Environment Agency Integrated Height Model (EA IHM) 2016, with input rainfall and flow estimates from the Centre for Ecology & Hydrology (CEH). Sea level estimates have been taken from the Coastal Flood Boundary Project (CFB) 2018. Climate Change uplift values taken from the Welsh Government guidance available at the time of modelling (2018).
- Additional Information
-
More information on the FRAW 2018 project can be found in the final project report.
JBA Consulting 2019. Flood Risk Assessment Wales Project Report. Unpublished report commissioned by Natural Resources Wales. 363 pp, Natural Resources Wales, Cardiff.
- Dataset Reference Date (Publication)
- 2024-12-16
Temporal Extent
- Begin date
- 2019-01-01
- End date
- 2019-12-31
- Topic category
-
- Inland waters
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Distribution
Distribution
- Format Type and Description
-
-
Geographic Information System
(
Unknown
)
-
Geographic Information System
(
Unknown
)
- Resource Locator
- Download Data ( WWW:LINK-1.0-http--link )
Quality
Data quality
- Quality Scope
- Dataset
- Conformity
- Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Explanation
-
This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
-
The datasets have been created as part of the Flood Risk Assessment Wales (FRAW) 2018 project. The modelling has been undertaken on the Environment Agency Integrated Height Model (EA IHM) 2016, with input rainfall and flow estimates from the Centre for Ecology & Hydrology (CEH). Sea level estimates have been taken from the Coastal Flood Boundary Project (CFB) 2018. Climate Change uplift values taken from the Welsh Government guidance available at the time of modelling (2018).
Keywords
Keywords
Keywords
-
NRW Thesaurus
-
- flood risk
- flood hazard
- floods (flooding)
- Type
- Theme
Citation
- Date (Publication)
- 2026-08-27
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
-
Risk of Flooding from Surface Water
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
-
There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
-
© CNC/NRW. Some features of this information are based on digital spatial data licensed from the UK Centre for Ecology and Hydrology © UKCEH, © EA and Getmapping Plc and Bluesky International Limited (2015). Defra, Met Office and DARD Rivers Agency © Crown copyright. © Cranfield University. © James Hutton Institute. Contains OS data © Crown copyright and database right. Land and Property Services © Crown copyright and database right. Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and copyright of the owners. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
Attribution Statement
- Other constraints
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Contains Natural Resources Wales information © Natural Resources Wales and database right. All rights reserved. Some features of this information are based on digital spatial data licensed from the UK Centre for Ecology & Hydrology © UKCEH, the Environment Agency © EA and Getmapping Plc and Bluesky International Limited [2015]. Defra, Met Office and DARD Rivers Agency © Crown copyright. © Cranfield University. © James Hutton Institute. Contains OS data © Crown copyright and database right. Land & Property Services © Crown copyright and database right.
Licence
- Other constraints
- Open Government Licence
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313631323838 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2026-10-15T12:32:09.461Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0