8cbf29c3-4570-4392-845c-5ddf73f14b2b en utf8 dataset Water and Flood Division pointOfContact Water and Flood Division author 2025-02-20T09:45:23Z ISO 19115:2003 - Geographic information - Metadata ISO 19115:2003 4326 EPSG 6.11 geonode:pmfnfm_large_catchments NFM Prioritisation for Larger Flood Risk Catchments 2025-02-18T00:00:00Z publication date mapDigital This dataset comprises of a prioritisation method for identifying larger catchments, above communities at risk from fluvial flooding where Natural Flood Management (NFM) may be a suitable means of reducing flood risk. The dataset can be used to support the identification of areas suitable for NFM alongside other analyses undertaken by a suitably qualified person. The information provided is based on a national scale mapping approach, taking into account largely modelled and open-source data, therefore this mapping should be viewed as indicative rather than specific. Locations identified may have more recent building or land use than available data indicates. It is important to note that land ownership and change to flood risk have not been considered. This prioritisation has been based on an existing dataset highlighting catchments with a “Demand for Natural Flood Management”. These catchments were derived as part of the System Cynorthwyo Cunllunio Adnoddau Naturiol (SCCAN)  maps created by Natural Resources Wales.  These larger catchments above communities at risk from fluvial flooding are prioritised based on the percentage area of NFM potential as identified in two mapping sources, the Working with Natural Processes (WwNP) potential area maps and the System Cynorthwyo Cunllunio Adnoddau Naturiol (SCCAN) maps. The potential for the following features was summarised in the prioritisation: Runoff attenuation features (WwNP) Floodplain reconnection potential (WwNP) Riparian Woodland (WwNP) Infiltration improvements on slowly permeable soils (WwNP) Hedgerows (SCCAN) Bog restoration (SCCAN) Habitat change and improvements for increased surface roughness (SCCAN) Agricultural management through the retention of winter stubbles (SCCAN) The catchments have been categorised based on the percentage area of NFM potential of: <10% 10%-25% 25%-50% >50% This dataset was developed to aid in the identification of catchments suitable for Natural Flood Management. completed Water and Flood Division originator ESRI Shapefile 1.0 Natural flood management theme Global place license Open Government Licence for Public Sector Information (OGL): (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/) limitationNotListed This mapping should be reviewed against the following datasets:  Archaeological sites Historic Environment Features (HEF) Historic Landscape Areas (HLA) Registered Historic Parks and Gardens (RHPG) Scheduled Monument (SM) 50m buffer Scheduled Monument World Heritage Site (WHS) Bio-physical  Acid Sensitive Catchment Ancient Woodland Inventory Deep Peat and Modified Deep Peat Grassland Fungi Potential Habitat for Fritillary Butterflies over Bracken Potential Habitat for Great Crested Newts Potential Habitat for Open-ground Dependent Birds Priority Habitat – High Sensitivity Priority Habitat Mosaics – Investigation Required Red Squirrel Areas Regionally Important Geodiversity Site (RIGS) Sensitive Arable Plants Potential Habitat for Water Voles Landscape designations  Area of Outstanding Natural Beauty (AONB) Registered Common Land National Park Open Access Site of Special Scientific Interest (SSSI) Site of Special Scientific Interest (SSSI) 100/300m Buffer Upland Special Protection Areas (SPA) Upland Special Protection Areas (SPA) 500m Buffer Agriculture Agricultural Land Classification vector en utf8 environment -4.848571457542868 -2.5207645200625772 51.370986905348474 53.44235017614119 2017-01-01T00:00:00+00:00 2022-12-31T00:00:00+00:00 Derived data produced 2017 – 2022. Prioritisation map – 2022.  This dataset is one of a suite of products developed as part of the Welsh Government Natural Flood Management Review.  Other datasets include: Prioritisation Map for Natural Flood Management – Small Catchments Natural Flood Management Status Report To compliment this mapping, the user can also refer to the following open-source layers, which have not been included in this prioritisation: Agricultural Land Classification Bio-physical sites, archaeological sites and landscape designations as described under “Restrictions”   https://datamap.gov.wales WWW:LINK-1.0-http--link Online link to the 'NFM Prioritisation for Larger Flood Risk Catchments' description on GeoNode /static/geonode/img/missing_thumb.png?v=7d0bcf14 WWW:DOWNLOAD-1.0-http--download .png NFM Prioritisation for Larger Flood Risk Catchments (Thumbnail Format) https://datamap.gov.wales/geoserver/ows?service=WMS&request=GetLegendGraphic&format=image/png&WIDTH=20&HEIGHT=20&LAYER=geonode:pmfnfm_large_catchments&STYLE=pmfnfm_larger_catchments&version=1.3.0&sld_version=1.1.0&legend_options=fontAntiAliasing:true;fontSize:12;forceLabels:on WWW:DOWNLOAD-1.0-http--download .png NFM Prioritisation for Larger Flood Risk Catchments (Legend Format) https://datamap.gov.wales/geoserver/ows?service=WFS&version=1.0.0&request=GetFeature&typename=geonode%3Apmfnfm_large_catchments&outputFormat=json&srs=EPSG%3A27700&srsName=EPSG%3A27700 WWW:DOWNLOAD-1.0-http--download .json NFM Prioritisation for Larger Flood Risk Catchments (GeoJSON Format) https://datamap.gov.wales/geoserver/ows?service=WFS&version=1.0.0&request=GetFeature&typename=geonode%3Apmfnfm_large_catchments&outputFormat=excel&srs=EPSG%3A27700 WWW:DOWNLOAD-1.0-http--download .excel NFM Prioritisation for Larger Flood Risk Catchments (Excel Format) https://datamap.gov.wales/geoserver/ows?service=WFS&version=1.0.0&request=GetFeature&typename=geonode%3Apmfnfm_large_catchments&outputFormat=csv&srs=EPSG%3A27700 WWW:DOWNLOAD-1.0-http--download .csv NFM Prioritisation for Larger Flood Risk Catchments (CSV Format) https://datamap.gov.wales/geoserver/ows?service=WFS&version=1.0.0&request=GetFeature&typename=geonode%3Apmfnfm_large_catchments&outputFormat=text%2Fxml%3B+subtype%3Dgml%2F3.1.1&srs=EPSG%3A27700 WWW:DOWNLOAD-1.0-http--download .gml NFM Prioritisation for Larger Flood Risk Catchments (GML 3.1.1 Format) https://datamap.gov.wales/geoserver/ows?service=WFS&version=1.0.0&request=GetFeature&typename=geonode%3Apmfnfm_large_catchments&outputFormat=gml2&srs=EPSG%3A27700 WWW:DOWNLOAD-1.0-http--download .gml NFM Prioritisation for Larger Flood Risk Catchments (GML 2.0 Format) https://datamap.gov.wales/geoserver/ows?service=WFS&version=1.0.0&request=GetFeature&typename=geonode%3Apmfnfm_large_catchments&outputFormat=dxf&srs=EPSG%3A27700 WWW:DOWNLOAD-1.0-http--download .dxf NFM Prioritisation for Larger Flood Risk Catchments (DXF Format) https://datamap.gov.wales/geoserver/ows?service=WFS&version=1.0.0&request=GetFeature&typename=geonode%3Apmfnfm_large_catchments&outputFormat=gpkg&srs=EPSG%3A27700 WWW:DOWNLOAD-1.0-http--download .gpkg NFM Prioritisation for Larger Flood Risk Catchments (OGC Geopackage Format) https://datamap.gov.wales/geoserver/ows?service=WFS&version=1.0.0&request=GetFeature&typename=geonode%3Apmfnfm_large_catchments&outputFormat=SHAPE-ZIP&srs=EPSG%3A27700&format_options=charset%3AUTF-8 WWW:DOWNLOAD-1.0-http--download .zip NFM Prioritisation for Larger Flood Risk Catchments (Zipped Shapefile Format) https://datamap.gov.wales/geoserver/ows?service=WMS&request=GetMap&layers=geonode%3Apmfnfm_large_catchments&format=image%2Fpng&height=550&width=370&srs=EPSG%3A27700&bbox=210759.984375%2C167059.984375%2C363870.0%2C394090.0 WWW:DOWNLOAD-1.0-http--download .png NFM Prioritisation for Larger Flood Risk Catchments (PNG Format) https://datamap.gov.wales/geoserver/ows?service=WMS&request=GetMap&layers=geonode%3Apmfnfm_large_catchments&format=application%2Fpdf&height=550&width=370&srs=EPSG%3A27700&bbox=210759.984375%2C167059.984375%2C363870.0%2C394090.0 WWW:DOWNLOAD-1.0-http--download .pdf NFM Prioritisation for Larger Flood Risk Catchments (PDF Format) https://datamap.gov.wales/geoserver/ows?service=WMS&request=GetMap&layers=geonode%3Apmfnfm_large_catchments&format=image%2Fjpeg&height=550&width=370&srs=EPSG%3A27700&bbox=210759.984375%2C167059.984375%2C363870.0%2C394090.0 WWW:DOWNLOAD-1.0-http--download .jpg NFM Prioritisation for Larger Flood Risk Catchments (JPEG Format) https://datamap.gov.wales/download/5217 WWW:DOWNLOAD-1.0-http--download .zip NFM Prioritisation for Larger Flood Risk Catchments (Original dataset Format) https://datamap.gov.wales/geoserver/ows OGC:WFS geonode:pmfnfm_large_catchments Service - Provides Layer: NFM Prioritisation for Larger Flood Risk Catchments https://datamap.gov.wales/geoserver/ows OGC:WMS geonode:pmfnfm_large_catchments Service - Provides Layer: NFM Prioritisation for Larger Flood Risk Catchments dataset The data has been derived from:  SCCAN Demand for NFM WwNP 1% AEP Runoff Attenuation Features WwNP Floodplain Reconnection WwNP Riparian Planting WwNP Catchment Planting SCCAN Bog Restoration Opportunities SCCAN Surface Roughness Opportunities SCCAN Agricultural Management Opportunities The user should be directed to the Prioritisation Mapping Technical Report for the methodology used to produce this dataset.