Catalogue

28 Results


  • This GIS dataset and supporting information providing design / extreme sea level and typical surge information around the coastline of Wales under present day conditions. This is a specialist dataset which informs on work commenced around the coast ranging from coastal flood modelling, scheme design, strategic planning and flood risk assessments. The dataset contains the following layer

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  • The Development Advice Map (DAM) shows areas at risk of flooding for the purposes of land-use planning. The DAM should be used alongside Planning Policy Wales and Technical Advice Note (TAN) 15 to guide new development away from areas at risk of flooding wherever possible. Together, they form a precautionary framework to guide planning decisions. The maps shown here are not designed for

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  • Flood Alert Areas are geographical areas where it is possible for flooding to occur from rivers or the sea. A single Flood Alert Area may cover the floodplain within the Flood Warning Service Limit of multiple catchments of similar characteristics containing a number of Flood Warning Areas. A Flood Alert Area may also match that of a corresponding Flood Warning Area and warn for the possibility

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    Appears under
    Spatial data Flooding
  • The Flood Map is a spatial dataset that shows the areas across Wales that could be affected by flooding from rivers or the sea. It also shows flood defences and the areas that benefit from them. Flood Map is designed to raise awareness among the public local authorities and other organisations of the likelihood of flooding and to encourage people living and working in areas prone to flooding to

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    Spatial data Flooding
  • The Flood Map is a spatial dataset which shows the areas across Wales that could be affected by flooding from rivers or the sea. It also shows flood defences and the areas that benefit from them. Flood Map is designed to raise awareness among the public local authorities and other organisations of the likelihood of flooding and to encourage people living and working in areas prone to flooding to

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    Appears under
    Spatial data Flooding
  • Flood Map shows the areas across Wales that could be affected by flooding from rivers or the sea. It also shows flood defences and the areas that benefit from them. Flood Map is designed to raise awareness among the public local authorities and other organisations of the likelihood of flooding and to encourage people living and working in areas prone to flooding to find out more and take

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    Appears under
    Spatial data Flooding
  • The Flood Map shows the areas across Wales that could be affected by flooding from rivers or the sea. It also shows flood defences and the areas that benefit from them. Flood Map is designed to raise awareness among the public local authorities and other organisations of the likelihood of flooding and to encourage people living and working in areas prone to flooding to find out more and take

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    Appears under
    Spatial data Flooding
  • The Flood Map shows the areas across Wales that could be affected by flooding from rivers or the sea. It also shows flood defences and the areas that benefit from them. Flood Map is designed to raise awareness among the public local authorities and other organisations of the likelihood of flooding and to encourage people living and working in areas prone to flooding to find out more and take

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    Appears under
    Spatial data Flooding
  • Flood Risk Areas have been defined by Lead Local Flood Authorities. These areas cover surface water flooding only. Groundwater, coastal, reservoir failure, water main and river flooding are not covered. These are based on combining risk to people, critical services and commercial and public assets, and detailed flood modelling. The Flood Risk Areas show areas where the risk to flooding has the

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    Appears under
    Spatial data Flooding
  • This spatial Flood Warning Areas dataset are geographical areas where NRW expect flooding to occur and where NRW provide a Flood Warning Service. Flood Warning Areas generally contain properties that are expected to flood from rivers or the sea. Specifically, Flood Warning Areas define locations within the Flood Warning Service Limit that represent a discrete community at risk of flooding. A

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    Spatial data Flooding
  • Historic Flood Outlines is a spatial dataset which outlines the maximum extent of all recorded individual Historic Flood Events Outlines from river, the sea and groundwater springs and shows areas of land that have previously been subject to flooding in Wales. It is also possible that the pattern of flooding in this area has changed and that this area would now flood under different

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    Appears under
    Spatial data Flooding
  • Listing of Severe Flood Warnings, Flood Warnings, Update Flood Warnings and Flood Alerts issued since the Floodline Warnings Direct service went live on January 26th 2006 to the present. This dataset includes flood warnings issued by Natural Resources Wales (NRW) from 1 April 2013. Flood Alerts and Warnings are issued for flooding from rivers and the sea . For Flood Alerts this is generally river

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    Appears under
    Spatial data Flooding
  • This dataset contains details of Large Raised Reservoirs. Natural Resource Wales (NRW) collects and maintains data on all reservoirs designed or capable of holding more than 25,000 cubic metres of water above the natural level of any part of the land adjoining them defined as 'large raised reservoirs' under the Reservoirs Act 1975. Two types of reservoir are maintained within the register:

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    Appears under
    Spatial data Flooding Water
  • Information about flooding and other environmental alerts from NRW.

    Appears under
    Website Environment Flooding
  • This dataset is a more detailed version of the Coastal Erosion data also available on Lle. The National Coastal Erosion Risk Management (NCERM) map shows the spatial NCERM coastal baseline. This baseline is split to ‘frontages’. These are defined as lengths of coast with consistent characteristics based on the cliff behaviour characteristics and the defence characteristics. It is

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    Spatial data Marine Flooding
  • If you are a developer, you can now browse and download our data APIs directly from the Natural Resources Wales API Portal. 

    Current available API data sets 

    Flood Risk Forecast API (Open Data) - gives the indication of the potential for flooding for three days: the day on which it is issued and the subsequent two days ahead.

    Live Flood Warnings and Alerts API (Open Data) - provides

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  • This is a national assessment of flood risk for Wales produced using local expertise. The dataset shows the chance of flooding from rivers and/or the sea, based on cells of 50m. Each cell is allocated one of four flood risk categories, taking into account flood defenses and their condition. No more detailed resolution is provided. See the metadata for futher information.

    An online version of this

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    Appears under
    Spatial data Flooding
  • The surface water flood maps give an indication of the broad areas likely to be at risk of surface water flooding.  This includes flooding that takes place from the 'surface runoff' generated by rainwater (including snow and other precipitation) which:

    (a) is on the surface of the ground (whether or not it is moving), and
    (b) has not yet entered a watercourse, drainage system or public

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    Appears under
    Spatial data Flooding
  • The datasets shows the spatial coastal baseline which is split into ‘frontages’. These are defined as lengths of coast with consistent characteristics based on the cliff behaviour characteristics and the defence characteristics. It is intended as a benchmark dataset showing erosion extents and rates for three periods:

    • Short Term (0 – 20yr);
    • Medium Term (20 – 50yr); and
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    Spatial data Marine Flooding
  • A Shoreline Management Plan (SMP) is a large-scale assessment of the risks associated with coastal processes and helps reduce these risks to people and the developed, historic and natural environments. Coastal processes include tidal patterns, wave height, wave direction and the movement of beach and seabed materials. The SMPs set the strategic policy direction for coastal management and identify

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    Appears under
    Spatial data Flooding
  • This dataset shows flood defences protecting against river floods with a 1 percent (1 in 100) chance of happening each year, or sea floods with a 0.5 per cent (1 in 200) chance of happening each year, together with some, but not all, defences which protect against smaller floods. Flood defences that are not yet shown, and the areas that benefit from them, will be gradually added.

    Attribution

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    Appears under
    Spatial data Flooding
  • Working with Natural Processes (WWNP) Floodplain Reconnection Potential is our best estimate of locations where it may be possible to establish reconnection between a watercourse and its natural floodplain, especially during high flows. The dataset is designed to support signposting of areas where there is currently poor connectivity such that flood waters are constrained to the channel and flood

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  • Working with Natural Processes (WWNP) Floodplain Woodland Planting Potential is our best estimate of locations where tree planting on the floodplain may be possible, and effective to attenuate flooding. The dataset is designed to support signposting of areas of floodplain not already wooded.

    The information provided is largely based on modelled data and open constraints data, and is therefore

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  • Working with Natural Processes (WWNP) Riparian Woodland Potential is our best estimate of locations where tree planting may be possible on smaller floodplains close to flow pathways, and effective to attenuate flooding. The dataset is designed to support signposting of riparian areas not already wooded. The dataset is based upon a 50m buffer of available OS Open Data river networks. A set of open

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  • Runoff Attenuation Features Potential is our best estimate of locations of high flow accumulation across the land surface or in smaller channels, where it may be possible to temporarily store water and attenuate flooding during high flows. The dataset is designed to support signposting of areas where to target enhanced storage. It is based upon the Risk of Flooding from Surface Water datasets and

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  • Runoff Attenuation Features Potential is our best estimate of locations of high flow accumulation across the land surface or in smaller channels, where it may be possible to temporarily store water and attenuate flooding during high flows. The dataset is designed to support signposting of areas to target enhanced storage. It is based upon the Risk of Flooding from Surface Water datasets and

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  • Working with Natural Processes (WWNP) Wider Catchment Woodland Potential is our best estimate of locations where there are slowly permeable soils, where scrub and tree planting may be most effective to increase infiltration and hydrological losses. The dataset is designed to support signposting of areas not already wooded.

    Locations identified may have more recent building or land use than

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  • This dataset comprises a range of land cover types where the woodland potential layers have been masked, owing to existing woodland, watercourses, peat, roads, rail and urban areas. Other constraints data, such as protected habitats and high grade agricultural land, should also be considered.

    Locations identified may have more recent land use change than available at the time of publication.

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