Flood Map for Planning / Development Advice Map

There is high demand for this service at the moment. We apologise if you experience problems viewing the Flood Map for Planning. We will continue to monitor the service.

Development Advice Map

The Development Advice Map and associated planning policy TAN15: Development and Flood Risk is the current framework for assessing flood risk to and from new development.  

The Development Advice Map is used as a screening tool by Local Authorities to understand where further assessment of flooding may be needed.

(Right click on the map button to open it in a new tab)

 

Flood Map for Planning

A revised TAN15 is due to be implemented in June 2023. This will be supported by the new Flood Map for Planning, which includes climate change information to show how this will affect flood risk extents over the next century. It shows the potential extent of flooding assuming no defences are in place.

The Flood Map for Planning has no official status for planning purposes until June 2023, however we may use the data as the ‘best available information’ on flood risk to inform our planning advice. 

More information on the formal implementation of the new TAN15 and Flood Map for Planning is set out in the Written Statement from the Welsh Government

The Flood Map for Planning has two views: 

  • Basic - this includes enough data for high level screening against TAN 15
  • Detailed - this includes extra detail that can be used for Flood Consequences Assessments

(Right click on the map button to open it in a new tab)

 

For present day, defended flood risk, view our Flood Risk Assessment Wales map. This map has no official status for planning purposes, as it does not consider the impact of climate change in the future. Together the two maps form the Wales Flood Map. 

What do the map layers mean? 

The Flood Map for Planning has the following layers, which show the potential extent of flooding, assuming no defences are in place:

Rivers – Flood Zone 2

Areas with 0.1% to 1% (1 in 1000 to 1 in 100) chance of flooding from rivers in a given year, including the effects of climate change. 

Rivers – Flood Zone 3

Areas with more than 1% (1 in 100) chance of flooding from rivers in a given year, including the effects of climate change. 

Rivers & Sea – Flood Zone 2

The combined 0.1% risk of flooding from rivers and the sea including climate change.

Rivers & Sea – Flood Zone 3

The combined 1% risk of flooding from rivers and the sea including climate change.

Sea – Flood Zone 2

Areas with 0.1% to 0.5% (1 in 1000 to 1 in 200) chance of flooding from the sea in a given year, including the effects of climate change.

Sea – Flood Zone 3

Areas with more than 0.5% (1 in 200) chance of flooding from the sea in a given year, including the effects of climate change.

Surface Water and Small Watercourses – Flood Zone 2

Areas with 0.1% to 1% (1 in 1000 to 1 in 100) chance of flooding from surface water and/or small watercourses in a given year, including the effects of climate change.

Surface Water and Small Watercourses – Flood Zone 3

Areas with more than 1% (1 in 100) chance of flooding from surface water and/or small watercourses in a given year, including the effects of climate change

TAN15 Defended Zones

Area that benefit from Risk Management Authority flood defences with the following minimum Standard of Protection:

  • 1 in 100 year (present day) for rivers
  • 1 in 200 year (present day) for the sea

Recorded Flood Extents

Areas that are recorded as having flooded previously.

Flood defence location

More information about the location and standard of protection of formal flood risk defences.

Flood risk from reservoirs

More information about reservoir flood risk.

Main rivers

More information about main rivers. If a planning proposal is next to a main river, you may need a permit in addition to planning permission. 

NRW Local Model Manager

Areas where NRW holds detailed local flood models, which may be useful to help inform a flood consequences assessment to support a planning application. Contact datadistribution@naturalresourceswales.gov.uk to ask for access to this data. 

Shoreline Management Plans & coastal erosion

More information about Shoreline Management Plans and coastal erosion. You will need to consider these plans for coastal development proposals. Erosion rates on the map are for short, medium and longer term periods. These are based on ‘confidence bandings’ (of 5%, 50% and 95%) and follow the current Shoreline Management Plan policies.

Challenging our flood maps 

Find out more about our flood risk mapping information, including guidance about:

Challenging our flood maps

Developing your own hydraulic models

Modelling for Flood Consequence Assessments

GIS data

If you need to download GIS data, many of the map layers can be downloaded from DataMapWales.

Acknowledgements

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 r

Last updated