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    NRW_TAN15_DEFENDED_ZONES

  • 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 in June 2023.  Although it currently has no official status for planning purposes it is a useful data source when considering flood risks.

    More information on the formal implementation of the new TAN15 and FMfP is set out in the Written Statement from the Welsh Government.

    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.

    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.

    Attribution Statement

    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.

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    Attributes (6)

    Attribute name Label Description
    name
    defends_against
    defends_against_cy
    shape_starea__
    shape_stlength__
    geom
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    Type:
    Spatial data
    Category:
    Planning Cadastre

    Information used for appropriate actions for future use of the land. Examples: land use maps, zoning maps, cadastral surveys, land ownership

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    10 June 2022
    License:
    Open Government Licence for Public Sector Information (OGL)

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    Keywords:
    features, flood map for planning, tan 15 defended zones
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    Language
    English