Flood Risk Assessment Wales (FRAW)
Flood Risk from Rivers
Flood Risk from the Sea
Flood Risk from Surface Water and Small Watercourses
Flood Risk Assessment Wales provides a national assessment of risk flooding from Rivers, the Sea and Surface Water and Small Watercourses. The assessment takes into account flood defences and combines new, national-scale modelling with detailed local-scale models to categories risk into 3 bands, labelled ‘High’, ‘Medium’ and ‘Low’ risk.
dataset
https://datamap.gov.wales/layergroups/inspire-nrw:FloodRiskAssessmentWales
name: Download data and Web Service
name: Web Mapping Service
124841
https://naturalresources.wales
eng
OGP
urn:ogc:def:crs:EPSG::BNG
More information is available in the FRAW (2019) project report and NRWs Understanding your flood risk results webpage (https://naturalresources.wales/flooding/managing-flood-risk/understanding-your-flood-risk-results?lang=en) for more information on our flood risk data and how it should be used.
inlandWaters
environment
Natural risk zones
publication
2023-06-13
-5.77774100
-2.60886500
53.51306700
51.24082900
publication
2023-06-13
Wales (WLS)
2018-09-01
2023-06-13
publication
2023-06-06
biannually
For Rivers and Surface Water and Small Watercourses: ‘High’ risk means that each year, this area has a chance of flooding of greater than 1 in 30 (3.3%) ‘Medium’ risk means that each year, an area has a chance of flooding of between 1 in 100 (1%) and 1 in 30 (3.3%). ‘Low’ risk means that each year, an area has a chance of flooding of between 1 in 1000 (0.1%) and 1 in 100 (1%). For the Sea: ‘High’ risk means that each year, this area has a chance of flooding of greater than 1 in 30 (3.3%) ‘Medium’ risk means that each year, an area has a chance of flooding of between 1 in 200 (0.5%) and 1 in 30 (3.3%). ‘Low’ risk means that each year, an area has a chance of flooding of between 1 in 1000 (0.1%) and 1 in 200 (0.5%) The risk assessment takes into account the effect of flood defences where we have information. Flood defences reduce, but do not completely stop the chance of flooding as they can be overtopped or fail. Flood risk information for each source has been created as ‘onion-skins’, i.e. with no overlapping data between individual risk bands. These risk bands should be combined and displayed a single layer for each flood source. If data is displayed in map form to others, appropriate map scales should be used given the indicative nature of the modelling. It should be shown with a maximum zoom scale of 1:5,000 and that base mapping of 1:10,000 is used to give context. The flood mapping is based on areas at risk of flooding and is not specific t o individual properties. NRW doesn’t hold information about an individual property’s construction that might affect whether flooding of a certain depth could enter a property and cause damage. As such, our information has been produced to identify general areas potentially at risk of flooding for further investigation. Spatial resolution of the data: National scale modelling undertaken at 2m grid resolution. Local scale modelling undertaken at different resolutions, typically between 2m – 10m.
© CNC/NRW and UKCEH Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Natural Resources Wales (NRW)
0300 065 3000
enquiries@naturalresourceswales.gov.uk
owner
Natural Resources Wales (NRW)
0300 065 3000
enquiries@naturalresourceswales.gov.uk
originator
Natural Resources Wales (NRW)
0300 065 3000
enquiries@naturalresourceswales.gov.uk
pointOfContact
2023-06-12