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Flood Map for Planning (FMfP) TAN15 Defended Zones
Map Llifogydd ar gyfer Cynllunio Parthau a Amddiffynnir TAN15

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The Flood Map for Planning (FMfP) includes climate change information to show how this will affect flood risk extents for rivers, the sea and surface water and small watercourses over the next century. It shows the potential extent of flooding assuming no defences are in place. It also indicates areas at risk from coastal erosion, areas that have flooded in the past and key information on the location of flood defence infrastructure.


The FMfP can be considered as the best available information on flood risk and will replace the Development Advice Map for planning purposes when the Welsh Government implements the revised TAN15. Although it currently has no official status for planning purposes it is a useful data source when considering flood risks.


The coming into force of the new TAN 15 and the Flood Map for Planning has been suspended due to a further consultation on the TAN.


Technical advice note (TAN) 15: development, flooding and coastal erosion - https://www.gov.wales/technical-advice-note-tan-15-development-flooding-and-coastal-erosion


The FMfP introduces a new layer called the TAN15 Defended Zone. This shows areas that benefit from risk management authority owned flood defence infrastructure, that have a minimum, Present Day level of protection of:


• 1% (1 in 100) annual event probability (AEP) for rivers, or

• 0.5% (1 in 200) annual event probability (AEP) for the sea.


Flood defences built after 1 January 2016 must also include design freeboard and an allowance for climate change.

Mae'r Map Llifogydd ar gyfer Cynllunio yn cefnogi polisi cynllunio Llywodraeth Cymru ar berygl llifogydd a dyma'r man cychwyn ar gyfer ystyriaeth o berygl llifogydd yn y system cynllunio. Mae'n rhoi syniad o ba dir sydd mewn perygl o lifogydd gan afonydd, y môr ac o ddŵr wyneb a chyrsiau dŵr bach, gan ystyried effeithiau newid yn yr hinsawdd dros y ganrif nesaf. Y Map Llifogydd ar gyfer Cynllunio yw'r set ddata allweddol i hysbysu a llywio penderfyniadau ynghylch datblygiad yn y dyfodol.


Mae'r Parth a Amddiffynnir TAN15 yn dangos lleoliadau sy'n elwa ar seilwaith amddiffyn rhag llifogydd sylweddol a sydd wedi'u dosbarthu i derfyn Parth Llifogydd 2 (1 mewn 1000 ynghyd â'r newid yn yr hinsawdd).


Mae Parthau a Amddiffynnir TAN15 wedi eu creu ar gyfer yr ardaloedd y tu ôl i amddiffynfeydd llifogydd sy'n cael eu rheoli a'u cynnal a'u cadw gan Awdurdodau Rheoli Risg sydd ag isafswm Safon Amddiffyn Bresennol o:


1% (1 mewn 100) tebygolrwydd digwyddiad blynyddol (AEP) ar gyfer afonydd, neu

0.5% (1 mewn 200) tebygolrwydd digwyddiad blynyddol (AEP) ar gyfer y môr

Caiff Parthau a Amddiffynnir TAN15 eu creu ar gyfer ffynonellau unigol o lifogydd (h.y. afonydd neu'r môr).


Nid oes Parthau a Amddiffynnir TAN15 ar gyfer dŵr wyneb a chyrsiau dŵr bach.


Cydnabyddiaeth


Yn cynnwys gwybodaeth Cyfoeth Naturiol Cymru © Cyfoeth Naturiol Cymru a hawl cronfa ddata. Cedwir pob hawl. Mae rhai nodweddion o'r wybodaeth hon yn seiliedig ar ddata gofodol digidol wedi'i drwyddedu gan Ganolfan Ecoleg a Hydroleg y DU © UKCEH DEFRA, y Swyddfa Dywydd ac Asiantaeth Afonydd yr Adran Amaethyddiaeth a Datblygu Gwledig © Hawlfraint y Goron. © Prifysgol Cranfield. © Sefydliad James Hutton. Yn cynnwys data OS © Hawlfraint y Goron a hawl cronfa ddata.

  • Identification
  • Extent
  • Distribution
  • Quality
  • Keywords
  • Spatial Reference System
  • Content
  • Constraints
  • Maintenance
  • Metadata

Identification

Dynodydd
Identifier
NRW_DS125074
Laith Metadata
Metadata Language
English
Lineage

TAN15 Defended Zones are created for individual sources of flooding (i.e. Rivers or Sea). There are no TAN15 Defended Zones for Surface Water & Small Watercourses.

Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2026-05-21
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 

Extent

Extent

Hyd
Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 
 

Distribution

Dosbarthiad
Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Geographic Information System ( Unknown )

    Specification

    ESRI Feature Class

Lleolwr Adnoddau
Resource Locator
Web Mapping Service ( OGC:WMS )
Lleolwr Adnoddau
Resource Locator
Download Data & Web Services ( WWW:LINK-1.0-http--link )
 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
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

TAN15 Defended Zones are created for individual sources of flooding (i.e. Rivers or Sea). There are no TAN15 Defended Zones for Surface Water & Small Watercourses.

 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
  • Natural risk zones
  • Land use
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus

  • flood modelling
  • flood risk
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2026-03-04
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
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

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© 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.

 

Attribution Statement

Other constraints

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. Defra, Met Office and DARD Rivers Agency © Crown copyright. © Cranfield University. © James Hutton Institute. Contains OS data © Crown copyright and database right.

 

Licence

Other constraints
Open Government Licence
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313235303734 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-06-01T14:13:03.488Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

Access the portal
Full access to the portal and metadata.


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