67 datasets found
  1. Statutory Main River Map

    • environment.data.gov.uk
    • hub.arcgis.com
    Updated Jan 11, 2023
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    Environment Agency (2023). Statutory Main River Map [Dataset]. https://environment.data.gov.uk/dataset/25dde009-ba7d-40de-8380-c5c3bb32ccdc
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    Dataset updated
    Jan 11, 2023
    Dataset authored and provided by
    Environment Agencyhttps://www.gov.uk/ea
    License

    Open Government Licence 3.0http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
    License information was derived automatically

    Description

    Statutory Main Rivers Map is a spatial (polyline) dataset that defines statutory watercourses in England designated as Main Rivers by the Environment Agency.

    Watercourses designated as ‘main river’ are generally the larger arterial watercourses. The Environment Agency has permissive powers, but not a duty, to carry out maintenance, improvement or construction work on designated main rivers.

    All other open water courses in England are determined by statute as an ‘ordinary watercourse’. On these watercourses the Lead Local flood Authority or, if within an Internal Drainage District, the Internal Drainage Board have similar permissive powers to maintain and improve.

  2. Statutory Main River Map Variations

    • environment.data.gov.uk
    Updated Aug 3, 2022
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    Environment Agency (2022). Statutory Main River Map Variations [Dataset]. https://environment.data.gov.uk/dataset/aa56733a-1181-420e-92f3-4515fccf594d
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    Dataset updated
    Aug 3, 2022
    Dataset authored and provided by
    Environment Agencyhttps://www.gov.uk/ea
    License

    Open Government Licence 3.0http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
    License information was derived automatically

    Description

    The Statutory Main River Map Variations dataset defines proposed changes to the Statutory Main River Map.

    Statutory Main Rivers Map defines statutory watercourses in England designated as Main Rivers by Environment Agency.

    Watercourses designated as ‘main river’ are generally the larger arterial watercourses. The Environment Agency has permissive powers, but not a duty, to carry out maintenance, improvement or construction work on designated main rivers.

    All other open water courses in England are determined by statute as an ‘ordinary watercourse’. On these watercourses the Lead Local flood Authority or, if within an Internal Drainage District, the Internal Drainage Board have similar permissive powers to maintain and improve.

    The Environment Agency notifies the public and interested parties of our intentions to make a change to the statutory main river map and decides which watercourses are designated as Main Rivers following a legal process to determine and publish changes.

    The change, or variation, to the Statutory Main River Map is either a deletion (also known as a demainment) or an addition (also known as an enmainment).

    There are two reasons for a change to the Statutory Main River Map - Designation and Factual.

    Designation changes are required when we make a decision to lengthen or shorten the section of a river designated as a 'main river'. These changes will determine which risk management authority may carry out maintenance, improvement or construction work on the watercourse. These changes result also in differing legislation applying to the riparian owner and others with an interest.

    Factual changes may be required to update the map to represent the real position of the watercourse. They do not involve any changes of authority or management. Typical examples of factual changes are when: a watercourse has changed course naturally, a watercourse has been diverted or a survey of a culvert shows a different alignment.

    A change to the Statutory Main River Map goes through the following stages (identified as Status within the data):

    • Draft
    • Consultation
    • Pending Determination
    • Determination
    • Appeals
    • Pending Appeals
    • Pending Implementation
    • Implemented (Month and Year)
  3. Statutory Main River Map

    • hub.arcgis.com
    Updated Jan 4, 2018
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    Environment Agency (2018). Statutory Main River Map [Dataset]. https://hub.arcgis.com/maps/acfc69238b7a47b2a9a5657688f2c2fe
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    Dataset updated
    Jan 4, 2018
    Dataset authored and provided by
    Environment Agencyhttps://www.gov.uk/ea
    Area covered
    Description

    Web Map containing Statutory Main River Map, Statutory Main River Map Variations 2022 and Statutory Main River Variations pre 2021 feature layers.Created for use by Web Mapping Application: Main River Map

  4. E

    UKCEH digital river network of Great Britain (1:50,000)

    • catalogue.ceh.ac.uk
    Updated Dec 31, 2000
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    R.V. Moore; D.G. Morris; R.W. Flavin (2000). UKCEH digital river network of Great Britain (1:50,000) [Dataset]. https://catalogue.ceh.ac.uk/id/7d5e42b6-7729-46c8-99e9-f9e4efddde1d
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    Dataset updated
    Dec 31, 2000
    Dataset provided by
    NERC EDS Environmental Information Data Centre
    Authors
    R.V. Moore; D.G. Morris; R.W. Flavin
    Area covered
    Description

    This dataset comprises river centrelines, digitised from OS 1:50,000 mapping. It consists of four components: rivers; canals; surface pipes (man-made channels for transporting water such as aqueducts and leats); and miscellaneous channels (including estuary and lake centre-lines and some underground channels). This dataset is a representation of the river network in Great Britain as a set of line segments, i.e. it does not comprise a geometric network.

  5. W

    CEH digital river network of Great Britain web map service

    • cloud.csiss.gmu.edu
    • data.wu.ac.at
    wms
    Updated Dec 21, 2019
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    United Kingdom (2019). CEH digital river network of Great Britain web map service [Dataset]. https://cloud.csiss.gmu.edu/uddi/dataset/ceh-digital-river-network-of-great-britain-web-map-service
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    wmsAvailable download formats
    Dataset updated
    Dec 21, 2019
    Dataset provided by
    United Kingdom
    Area covered
    Great Britain, United Kingdom
    Description

    This is a view service of the CEH 1:50k rivers dataset. This is a river centreline network, based originally on OS 1:50,000 mapping. There are four layer: rivers; canals; surface pipes (man-made channels such as aqueducts and leats) and miscellaneous channels (including estuary and lake centre-lines and some underground channels).

  6. e

    Preliminary Flood Risk Assessment Map (Cycle 2) – Severn River Basin...

    • data.europa.eu
    • environment.data.gov.uk
    zip
    Updated Dec 18, 2018
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    Environment Agency (2018). Preliminary Flood Risk Assessment Map (Cycle 2) – Severn River Basin District [Dataset]. https://data.europa.eu/data/datasets/preliminary-flood-risk-assessment-map-cycle-2-severn-river-basin-district
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    zipAvailable download formats
    Dataset updated
    Dec 18, 2018
    Dataset authored and provided by
    Environment Agency
    Description

    This dataset consists of an interactive map (and supporting guidance) containing background information that informs how we understand flood risk across the Severn River Basin District. The map shows the River Basin District, component river basins and the coastline together with layers showing land use and topography.

    This dataset together with equivalent datasets for each River Basin District, supports the Preliminary Flood Risk Assessment for England report which has been written to meet the requirements of the Flood Risk Regulations (2009) - to complete an assessment of flood risk and produce supporting maps of river catchments. Attribution statement: © Environment Agency copyright and/or database right 2018. All rights reserved. © Crown copyright and database rights 2018 Ordnance Survey 100024198 © Bluesky International Ltd/Getmapping PLC. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, British Antarctic Survey and British Geological Survey. © NERC (Centre for Ecology & Hydrology; British Antarctic Survey; British Geological Survey).
    Contains public sector information licensed under the Open Government Licence v3.0.

  7. b

    Map of wooded riparian zones in Great Britain

    • hosted-metadata.bgs.ac.uk
    • catalogue.ceh.ac.uk
    • +3more
    zip
    Updated Dec 19, 2017
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    Centre for Ecology & Hydrology (2017). Map of wooded riparian zones in Great Britain [Dataset]. https://hosted-metadata.bgs.ac.uk/geonetwork/srv/api/records/ec3ed342-5dc3-448f-baaa-c3b77bff1065
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    zipAvailable download formats
    Dataset updated
    Dec 19, 2017
    Dataset provided by
    Centre for Ecology & Hydrology
    NERC EDS Environmental Information Data Centre
    License

    https://eidc.ceh.ac.uk/licences/OGL/plainhttps://eidc.ceh.ac.uk/licences/OGL/plain

    http://inspire.ec.europa.eu/metadata-codelist/LimitationsOnPublicAccess/noLimitationshttp://inspire.ec.europa.eu/metadata-codelist/LimitationsOnPublicAccess/noLimitations

    Area covered
    Description

    This dataset provides a 1km resolution raster (gridded) coverage of wooded areas in riparian zones (river- or streamsides) across Great Britain. The areas classified as riparian in this dataset are defined by a 50 metre buffer applied to the CEH 1:50000 watercourse network. Wooded areas within this zone are identified as those classified by the Land Cover Map of Great Britain 2007 as either coniferous or deciduous woodland. The data are aggregated to a 1km resolution. Full details about this dataset can be found at https://doi.org/10.5285/ec3ed342-5dc3-448f-baaa-c3b77bff1065

  8. b

    OS Open Rivers

    • hosted-metadata.bgs.ac.uk
    • data.europa.eu
    html, null +1
    Updated Oct 2020
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    Ordnance Survey (2020). OS Open Rivers [Dataset]. https://hosted-metadata.bgs.ac.uk/geonetwork/srv/api/records/4695c100-c8c7-11e4-8731-1681e6b88ec1
    Explore at:
    null, html, www:link-1.0-http--linkAvailable download formats
    Dataset updated
    Oct 2020
    Dataset provided by
    Ordnance Surveyhttps://os.uk/
    License

    Open Government Licence 3.0http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
    License information was derived automatically

    http://inspire.ec.europa.eu/metadata-codelist/LimitationsOnPublicAccess/noLimitationshttp://inspire.ec.europa.eu/metadata-codelist/LimitationsOnPublicAccess/noLimitations

    Time period covered
    1880 - Oct 2020
    Area covered
    Description

    OS Open Rivers GIS data contains over 144,000 km of water bodies and watercourses map data. These include freshwater rivers, tidal estuaries and canals.

    Understand how water bodies and watercourses in Great Britain join up.

    OS Open Rivers provides a comprehensive datset of Great Britain's River Network, which approximately indicates the central alignment of the watercourse. Inland and tidal rivers are represented by a series of connected link and node features which are assigned with river name and flow direction.

  9. E

    EA Detailed River Network (DRN)

    • catalogue.ceh.ac.uk
    Updated Sep 30, 2012
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    NERC EDS Environmental Information Data Centre (2012). EA Detailed River Network (DRN) [Dataset]. https://catalogue.ceh.ac.uk/id/6071dc92-008f-41e3-a4fa-bb039c771c9b
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    Dataset updated
    Sep 30, 2012
    Dataset provided by
    NERC EDS Environmental Information Data Centre
    Area covered
    Description

    Large-scale, accurate and fully attributed digital river centreline covering England and Wales. The dataset has full-feature network geometry cross-referenced with OS MasterMap following Digital National Framework principles. The dataset has full-feature network geometry cross-referenced with OS MasterMap following Digital National Framework. It is made of the three following layers: - Links: lines representing the river network. It is a river centreline dataset, based on OS MasterMap for surface features and Environment Agency culvert surveys for underground features (where available). There are many attributes associated with this dataset to enable it to be used for many different business purposes. It is topologically correct to allow it's use in network tracing tasks. - Offline Drainage: lines representing the sections of river and drains that do not obviously connect to the main online drainage network represented by the DRN. Sections with uncertain flow direction and connectivity are presented here, although in reality some may connect to the main DRN, and be added to it as more information becomes available. - Nodes: points representing the junctions between discrete stretches of the online DRN. It is used to assist in connectivity and flow direction, as every DRN stretch is attributed with the 'from' and 'to' nodes. Nodes are also included where line features cross, but do not intersect, such as an aqueduct passing over a river. Nodes have types to determine whether they are at for example junction or at a change in river type.

  10. n

    UKCEH digital river network of Great Britain web map service

    • data-search.nerc.ac.uk
    Updated Feb 11, 2020
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    (2020). UKCEH digital river network of Great Britain web map service [Dataset]. https://data-search.nerc.ac.uk/geonetwork/srv/search?type=service
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    Dataset updated
    Feb 11, 2020
    Area covered
    United Kingdom
    Description

    This is a web map service of the UKCEH digital river network of Great Britain (1:50,000). It is a river centreline network, based originally on OS 1:50,000 mapping. There are four layers: rivers; canals; surface pipes (man-made channels such as aqueducts and leats) and miscellaneous channels (including estuary and lake centre-lines and some underground channels).

  11. Chalk Rivers (England)

    • naturalengland-defra.opendata.arcgis.com
    Updated Apr 1, 2022
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    Defra group ArcGIS Online organisation (2022). Chalk Rivers (England) [Dataset]. https://naturalengland-defra.opendata.arcgis.com/datasets/Defra::chalk-rivers-england/about
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    Dataset updated
    Apr 1, 2022
    Dataset provided by
    Defra - Department for Environment Food and Rural Affairshttp://defra.gov.uk/
    Authors
    Defra group ArcGIS Online organisation
    Area covered
    Description

    Data shows the location of Priority Habitat Chalk rivers and Streams. Replaces the existing 1:50,000 scale data.Based on Environment Agency Detailed River Network (DRN) version 3. All fields from DRN have been retained. This subset of chalk rivers uses the old 1:50,000 Biodiversity Action Plan (BAP) chalk river data, BGS geology, WWF report "The State of England’s Chalk Streams" and stakeholder knowledge to produce an updated chalk river network for England.Full metadata can be viewed on data.gov.uk (to follow).

  12. W

    Preliminary Flood Risk Assessment Map (Cycle 2) – Humber River Basin...

    • cloud.csiss.gmu.edu
    • environment.data.gov.uk
    Updated Dec 23, 2019
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    United Kingdom (2019). Preliminary Flood Risk Assessment Map (Cycle 2) – Humber River Basin District [Dataset]. https://cloud.csiss.gmu.edu/uddi/dataset/preliminary-flood-risk-assessment-map-cycle-2-humber-river-basin-district
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    Dataset updated
    Dec 23, 2019
    Dataset provided by
    United Kingdom
    License

    http://reference.data.gov.uk/id/open-government-licencehttp://reference.data.gov.uk/id/open-government-licence

    Description

    This dataset consists of an interactive map (and supporting guidance) containing background information that informs how we understand flood risk across the Humber River Basin District. The map shows the River Basin District, component river basins and the coastline together with layers showing land use and topography.

    This dataset together with equivalent datasets for each River Basin District, supports the Preliminary Flood Risk Assessment for England report which has been written to meet the requirements of the Flood Risk Regulations (2009) - to complete an assessment of flood risk and produce supporting maps of river catchments. Attribution statement: Open Government Licence

    © Environment Agency copyright and/or database right 2018. All rights reserved. © Crown copyright and database rights 2018 Ordnance Survey 100024198 © Bluesky International Ltd/Getmapping PLC. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, British Antarctic Survey and British Geological Survey. © NERC (Centre for Ecology & Hydrology; British Antarctic Survey; British Geological Survey).
    Contains public sector information licensed under the Open Government Licence v3.0.

  13. Preliminary Flood Risk Assessment Map (Cycle 2) – Thames River Basin...

    • data.europa.eu
    • environment.data.gov.uk
    unknown
    Updated Sep 28, 2021
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    Environment Agency (2021). Preliminary Flood Risk Assessment Map (Cycle 2) – Thames River Basin District [Dataset]. https://data.europa.eu/data/datasets/preliminary-flood-risk-assessment-map-cycle-2-thames-river-basin-district
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    unknownAvailable download formats
    Dataset updated
    Sep 28, 2021
    Dataset authored and provided by
    Environment Agencyhttps://www.gov.uk/ea
    License

    Open Government Licence 3.0http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
    License information was derived automatically

    Area covered
    River Thames
    Description

    This dataset consists of an interactive map (and supporting guidance) containing background information that informs how we understand flood risk across the Thames River Basin District. The map shows the River Basin District, component river basins and the coastline together with layers showing land use and topography.

    This dataset together with equivalent datasets for each River Basin District, supports the Preliminary Flood Risk Assessment for England report which has been written to meet the requirements of the Flood Risk Regulations (2009) - to complete an assessment of flood risk and produce supporting maps of river catchments. Attribution statement: Open Government Licence

    © Environment Agency copyright and/or database right 2018. All rights reserved. © Crown copyright and database rights 2018 Ordnance Survey 100024198 © Bluesky International Ltd/Getmapping PLC. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, British Antarctic Survey and British Geological Survey. © NERC (Centre for Ecology & Hydrology; British Antarctic Survey; British Geological Survey).
    Contains public sector information licensed under the Open Government Licence v3.0.

  14. Priority River Habitat - Rivers (England)

    • data.catchmentbasedapproach.org
    • hamhanding-dcdev.opendata.arcgis.com
    • +3more
    Updated Jul 7, 2017
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    Defra group ArcGIS Online organisation (2017). Priority River Habitat - Rivers (England) [Dataset]. https://data.catchmentbasedapproach.org/datasets/Defra::priority-river-habitat-rivers-england
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    Dataset updated
    Jul 7, 2017
    Dataset provided by
    Defra - Department for Environment Food and Rural Affairshttp://defra.gov.uk/
    Authors
    Defra group ArcGIS Online organisation
    Area covered
    Description

    One of the two datasets that make up the Priority River Habitat Map. Consists of rivers and streams that exhibit a high degree of naturalness. The naturalness classification used to map priority river habitat is based on recent work to review the river SSSI series. It evaluates four main components of habitat integrity: hydrological, physical, physico-chemical (water quality) and biological. An additional classification of the naturalness of headwaters (defined as streams with a catchment area of <10km2 to coincide with WFD typology boundaries) uses land cover data as a surrogate for direct information on river habitat condition (information which is generally lacking on headwaters). Streams and rivers operating under natural processes, free from anthropogenic impact and with a characteristic and dynamic mosaic of small-scale habitats that supports characteristic species assemblages (including priority species), are the best and most sustainable expression of river ecosystems. Key elements are: a natural flow regime; natural nutrient and sediment delivery regimes; minimal physical modifications to the channel, banks and riparian zone; natural longitudinal and lateral hydrological and biological connectivity; an absence of non-native species; low intensity fishery activities. These conditions provide the best defence against climate change, maximising the ability of riverine ecosystems to adapt to changing conditions. They also provide the most valuable and effective transitional links with other priority habitats, including lakes, mires and coastal habitats. In English rivers and streams, high levels of naturalness are rare.Full metadata can be viewed on data.gov.uk.

  15. E

    River Obstructions

    • catalogue.ceh.ac.uk
    Updated Jan 1, 2001
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    NERC EDS Environmental Information Data Centre (2001). River Obstructions [Dataset]. https://catalogue.ceh.ac.uk/id/326695ff-a760-45a1-98e4-8078f056a0cf
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    Dataset updated
    Jan 1, 2001
    Dataset provided by
    NERC EDS Environmental Information Data Centre
    License

    Open Government Licence 3.0http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
    License information was derived automatically

    Area covered
    Description

    Location of manmade barriers, mostly weirs, and natural features, such as waterfalls, on river courses in England and Wales. This dataset is known as 'Potential Sites of Hydropower Opportunity' and has been created under the EA project 'Opportunity and environmental sensitivity mapping for hydropower in England and Wales'. The dataset shows the location of opportunities for hydropower and the basic environmental sensitivity, which considers the presence of fish species and whether the site has been designated as Special Area of Conservation (SAC), associated with exploiting them. Besides their location, the dataset includes information on river level height, up and downstream the barrier.

  16. c

    Priority River Habitat - Headwater Areas (England)

    • data.catchmentbasedapproach.org
    • hub.arcgis.com
    • +4more
    Updated Jul 7, 2017
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    Defra group ArcGIS Online organisation (2017). Priority River Habitat - Headwater Areas (England) [Dataset]. https://data.catchmentbasedapproach.org/datasets/8e3f7118b7484c58a9d3f92700cfa39a
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    Dataset updated
    Jul 7, 2017
    Dataset authored and provided by
    Defra group ArcGIS Online organisation
    Area covered
    Description

    The objective of the priority habitat map in England is to:• help organisations protect the most natural remaining examples of rivers from further impacts on natural processes, and • highlight any aspects of habitat integrity (hydrological, chemical, physical, biological) that could most usefully be improved. The priority river habitat map that has been produced is an English interpretation of the UK definition of priority river habitat, focusing on naturalness as the principal criterion in recognition of the vital importance of natural processes in delivering sustainable riverine habitats and supporting characteristic biodiversity.Full metadata can be viewed on data.gov.uk.

  17. Preliminary Flood Risk Assessment Map (Cycle 2) – Anglian River Basin...

    • dsp.agrimetrics.co.uk
    • environment.data.gov.uk
    Updated Dec 12, 2018
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    Environment Agency (2018). Preliminary Flood Risk Assessment Map (Cycle 2) – Anglian River Basin District [Dataset]. https://dsp.agrimetrics.co.uk/dataset/5bdd882c-10bc-4f60-9857-cd1b17973b7c
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    Dataset updated
    Dec 12, 2018
    Dataset authored and provided by
    Environment Agencyhttps://www.gov.uk/ea
    License

    Open Government Licence 3.0http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
    License information was derived automatically

    Description

    This dataset consists of an interactive map (and supporting guidance) containing background information that informs how we understand flood risk across the Anglian River Basin District. The map shows the River Basin District, component river basins and the coastline together with layers showing land use and topography.

    This dataset together with equivalent datasets for each River Basin District, supports the Preliminary Flood Risk Assessment for England report which has been written to meet the requirements of the Flood Risk Regulations (2009) - to complete an assessment of flood risk and produce supporting maps of river catchments.

  18. Historic Flood Map

    • environment.data.gov.uk
    • data.catchmentbasedapproach.org
    Updated Feb 6, 2025
    + more versions
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    Environment Agency (2025). Historic Flood Map [Dataset]. https://environment.data.gov.uk/dataset/889885c0-d465-11e4-9507-f0def148f590
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    Dataset updated
    Feb 6, 2025
    Dataset authored and provided by
    Environment Agencyhttps://www.gov.uk/ea
    License

    Open Government Licence 3.0http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
    License information was derived automatically

    Description

    The Historic Flood Map is a GIS layer showing the maximum extent of individual Recorded Flood Outlines from river, the sea and groundwater springs that meet a set criteria. It shows areas of land that have previously been subject to flooding in England. This excludes flooding from surface water, except in areas where it is impossible to determine whether the source is fluvial or surface water but the dominant source is fluvial.

    The majority of records began in 1946 when predecessor bodies to the Environment Agency started collecting detailed information about flooding incidents, although we hold limited details about flooding incidents prior to this date.

    If an area is not covered by the Historic Flood Map it does not mean that the area has never flooded, only that we do not currently have records of flooding in this area that meet the criteria for inclusion. It is also possible that the pattern of flooding in this area has changed and that this area would now flood or not flood under different circumstances. Outlines that don’t meet this criteria are stored in the Recorded Flood Outlines dataset.

    The Historic Flood Map takes into account the presence of defences, structures, and other infrastructure where they existed at the time of flooding. It will include flood extents that may have been affected by overtopping, breaches or blockages.

    Flooding is shown to the land and does not necessarily indicate that properties were flooded internally.

  19. e

    Preliminary Flood Risk Assessment Map (Cycle 2) – South West River Basin...

    • data.europa.eu
    • cloud.csiss.gmu.edu
    • +1more
    zip
    Updated Oct 11, 2021
    + more versions
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    Environment Agency (2021). Preliminary Flood Risk Assessment Map (Cycle 2) – South West River Basin District [Dataset]. https://data.europa.eu/88u/dataset/preliminary-flood-risk-assessment-map-cycle-2-south-west-river-basin-district
    Explore at:
    zipAvailable download formats
    Dataset updated
    Oct 11, 2021
    Dataset authored and provided by
    Environment Agency
    Description

    This dataset consists of an interactive map (and supporting guidance) containing background information that informs how we understand flood risk across the South West River Basin District. The map shows the River Basin District, component river basins and the coastline together with layers showing land use and topography.

    This dataset together with equivalent datasets for each River Basin District, supports the Preliminary Flood Risk Assessment for England report which has been written to meet the requirements of the Flood Risk Regulations (2009) - to complete an assessment of flood risk and produce supporting maps of river catchments.

  20. g

    Priority River Habitat - Headwater Areas | gimi9.com

    • gimi9.com
    Updated Jul 9, 2025
    + more versions
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    (2025). Priority River Habitat - Headwater Areas | gimi9.com [Dataset]. https://gimi9.com/dataset/uk_priority-river-habitat-headwater-areas
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    Dataset updated
    Jul 9, 2025
    License

    CC0 1.0 Universal Public Domain Dedicationhttps://creativecommons.org/publicdomain/zero/1.0/
    License information was derived automatically

    Description

    One of the two datasets that make up the Priority River Habitat Map. Under the UK BAP definition all headwaters potentially form part of the priority habitat definition. The headwater resource can be a significant proportion of the river habitat network, accounting for the large majority of total river length. The headwater areas selected as most natural by land cover comprise a relatively large proportion of the upland headwater resource but a very small proportion of the lowland resource. The headwater analysis is the least certain component of the naturalness analysis – for example, highly natural headwater streams running through very small catchment areas, often wooded, would not be detectable by the analysis that has been undertaken. Equally, land cover is a crude measure of naturalness and various types of impact on river habitat are not well correlated with it (e.g. abstraction pressure, point source pollution). These issues can only be addressed through local interpretation of the final priority habitat map. Attribution statement: © Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right [year].

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Environment Agency (2023). Statutory Main River Map [Dataset]. https://environment.data.gov.uk/dataset/25dde009-ba7d-40de-8380-c5c3bb32ccdc
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Statutory Main River Map

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Dataset updated
Jan 11, 2023
Dataset authored and provided by
Environment Agencyhttps://www.gov.uk/ea
License

Open Government Licence 3.0http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
License information was derived automatically

Description

Statutory Main Rivers Map is a spatial (polyline) dataset that defines statutory watercourses in England designated as Main Rivers by the Environment Agency.

Watercourses designated as ‘main river’ are generally the larger arterial watercourses. The Environment Agency has permissive powers, but not a duty, to carry out maintenance, improvement or construction work on designated main rivers.

All other open water courses in England are determined by statute as an ‘ordinary watercourse’. On these watercourses the Lead Local flood Authority or, if within an Internal Drainage District, the Internal Drainage Board have similar permissive powers to maintain and improve.

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