National Flood Hazard Maps - Present Day
The National Flood Hazard Maps for Present day, are based on generalised modelling only. The maps have been published to comply with the Flood Risk Regulations (2009) and the EU Directive (2007/60/EC), and used to inform the creation of Flood Risk Management plans across Wales. 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 Maps for Present Day have been created for 3 sources of flooding, namely,
1. Flooding from Rivers
2. Flooding from the Sea
3. Flooding from Surface Water & Small Watercourse
The Maps show flood depth, velocity (speed and direction), hazard and extent for High, Medium and Low risk scenarios without raised flood defences.
For Rivers and Surface Water & Small Watercourses, High risk is up to 1 in 30year; Medium risk is between 1 in 30 and 1 in 100year; and Low risk is between 1 in 100year and 1 in 1,000year Annual Exceedance Probability (AEP).
For the Sea, High risk is up to 1 in 30 year; Medium risk is between 1 in 30 to 1 in 200 year; and Low risk 1 in 200 year to 1 in 1000 year.
The Flooding from Surface Water & Small Watercourses dataset is a direct replacement for the earlier Updated Flood Map for Surface Water (uFMfSW), 2013 and is based on the modelling of Surface Water Catchments. Details of the modelling work to produce the new National Flood Hazard Maps are available in the supporting Information sheets.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS124790
- Alternative Title
-
- Mapiau Perygl Llifogydd Cenedlaethol
- National Flood Hazard Maps Present Day.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.
- 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. Report to Natural Resources Wales. https://cyfoethnaturiolcymru.sharepoint.com/teams/waterman/frm/ran/FRAW/2019/2018s0011%20-%20FRAW%20Project%20Report%20-%20And%20Appendices.pdf
- Dataset Reference Date (Publication)
- 2020-10-01
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
)
- Specification
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WMS and WMTS data feeds from JBA consulting. Feed doesn’t have feature information enabled.
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Geographic Information System
(
Unknown
)
- Resource Locator
- View and Download Data ( WWW:LINK-1.0-http--link )
Quality
Data quality
- Quality Scope
- Dataset
- 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.
Keywords
Keywords
Keywords
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NRW Thesaurus
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- flood risk
- flood hazard
- floods (flooding)
- Type
- Theme
Citation
- Date (Publication)
- 2024-06-19
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
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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
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© 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
- 4f4c4942-4343-5764-6473-313234373930 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2024-12-17T17:40:11.781Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0