4f4c4942-4343-5764-6473-313631323838 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2025-12-19T12:09:58.231Z NRW 1.0 wel British National Grid (EPSG::27700) National Flood Hazard Maps - Climate Change National Flood Hazard Maps - Climate Change Mapiau Perygl Llifogydd Cenedlaethol - Newid Hinsawdd Mapiau Perygl Llifogydd Cenedlaethol National Flood Hazard Maps Climate Change.lyr 2024-12-16 NRW_DS161288 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). 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). Mae'r mapiau Perygl Llifogydd Cenedlaethol Newid Hinsawdd yn seiliedig ar fodelu cyffredinol yn unig. Mae'r mapiau hyn yn defnyddio'r un wybodaeth sylfaenol â Mapiau Peryglon Heddiw, ond maent yn caniatáu ar gyfer Newid Hinsawdd (2120). Nid oes gan y mapiau hyn unrhyw statws swyddogol at ddibenion Cynllunio neu Yswiriant, felly cynghorir y cyhoedd a gweithwyr proffesiynol i ddefnyddio’r wybodaeth sydd wedi’i chynnwys ym Map Asesiad Perygl Llifogydd Cymru, y Map Cyngor Datblygu / Map Llifogydd ar gyfer cynllunio (fel y bo’n briodol) at y dibenion hyn gan y bydd y rhain yn fwy diweddar ac yn ymgorffori gwell gwybodaeth ar gyfer modelu. Mae’r Map Peryglon Llifogydd Cenedlaethol ar gyfer Newid Hinsawdd wedi’i greu ar gyfer 3 ffynhonnell llifogydd, sef, 1. Llifogydd o afonydd 2. Llifogydd o'r môr 3. Llifogydd o ddŵr wyneb a chyrsiau dŵr bychain Mae'r Mapiau'n dangos dyfnder, cyflymder (buanedd), perygl a maint llifogydd ar gyfer senarios risg uchel, canolig ac isel gydag amddiffynfeydd llifogydd uwch. Ar gyfer afonydd a dŵr wyneb a chyrsiau dŵr bychain, risg uchel yw hyd at 1 mewn 30 mlynedd ynghyd ag ymgodiad newid hinsawdd (CC); Mae risg ganolig rhwng 1 mewn 30 ynghyd â CC ac 1 mewn 100 mlynedd a mwy o CC ac mae risg isel rhwng 1 mewn 100 mlynedd ynghyd ag CC ac 1 mewn 1,000 o flynyddoedd ynghyd â Thebygolrwydd Gormodiant Blynyddol (AEP) CC. Ar gyfer y Môr, risg uchel yw hyd at 1 mewn 30 mlynedd ynghyd â CC; risg ganolig yw rhwng 1 mewn 30 plws CC i 1 mewn 200 mlynedd ynghyd â CC; a risg isel yw 1 mewn 200 mlynedd ynghyd â CC i 1 mewn 1000 o flynyddoedd ynghyd â CC. Mae gwerthoedd ymgodiad Newid Hinsawdd yn defnyddio’r amcangyfrif “Canolog” ar gyfer y flwyddyn 2120 o ganllawiau Llywodraeth Cymru a oedd ar gael adeg y modelu (2018). Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en JBA Consultancy JBA Consulting, 1 Belle Vue Square, Broughton Road, Skipton, BD23 1FJ andrew.gubbin@jbaconsulting.com https://www.jbaconsulting.com/ Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Area management/restriction/regulation zones and reporting units GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme flood risk floods (flooding) flood hazard NRW Thesaurus 2025-01-08 geonetwork.thesaurus.local.theme.converted_nrw-keywords SeaDataNet Parameter Discovery Vocabulary 2024-06-19 geonetwork.thesaurus.external.theme.rdf+xml IPSV Subjects List 2020-11-18 geonetwork.thesaurus.external.theme.subjects NRW SMNR Keywords 2024-06-26 geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords There are no access restrictions on this data. NRW may release, publish or disseminate it freely. no limitations © 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. 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. Open Government Licence English inlandWaters SeaVoX Vertical Co-ordinate Coverages 2021-01-06 Wales (WLS) -5.311 -2.647 51.384 53.427 2019-01-01 2019-12-31 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 Risk of Flooding from Surface Water Geographic Information System Unknown https://datamap.gov.wales/documents/7106 WWW:LINK-1.0-http--link Download Data 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 2010-12-08 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false 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). More information about the maps can be found in a briefing note which is available via the 'download data' link. 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). More information about the maps can be found in a briefing note which is available via the 'download data' link.