{"accessLimitation":{"value":"registrationRequired","availability":"Available","description":"Access to the resource is limited to users who have created a user account or registered with the service providing access to the resource.","uri":"http://vocab.nerc.ac.uk/collection/N07/current/RACC/"},"alternateTitles":["IHU Areas with Coastline","Hydrometric areas for Great Britain and Northern Ireland"],"authors":[{"displayName":"National River Flow Archive","organisationName":"Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"author","email":"nrfa@ceh.ac.uk","fullName":"National River Flow Archive"}],"availability":"Available","boundingBoxes":[{"westBoundLongitude":-8.648,"eastBoundLongitude":1.768,"southBoundLatitude":49.864,"northBoundLatitude":60.861,"bounds":"{\"type\": \"Feature\",      \"properties\": {},      \"geometry\": {        \"type\": \"Polygon\",        \"coordinates\": [[[-8.648, 49.864], [-8.648, 60.861], [1.768, 60.861], [1.768, 49.864], [-8.648, 49.864]]]      }}","coordinates":"[[[-8.648, 49.864], [-8.648, 60.861], [1.768, 60.861], [1.768, 49.864], [-8.648, 49.864]]]"}],"citation":{"authors":["National River Flow Archive"],"bibtex":"https://catalogue.ceh.ac.uk/documents/1957166d-7523-44f4-b279-aa5314163237/citation?format=bib","day":23,"doi":"10.5285/1957166d-7523-44f4-b279-aa5314163237","month":6,"publisher":"NERC Environmental Information Data Centre","resourceTypeGeneral":"dataset","ris":"https://catalogue.ceh.ac.uk/documents/1957166d-7523-44f4-b279-aa5314163237/citation?format=ris","title":"Integrated Hydrological Units of the United Kingdom: Hydrometric Areas with Coastline","url":"https://doi.org/10.5285/1957166d-7523-44f4-b279-aa5314163237","year":2014},"custodians":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"custodian","email":"info@eidc.ac.uk"}],"datasetLanguages":["eng"],"datasetReferenceDate":{"publicationDate":"2014-06-23"},"description":"This dataset is part of Integrated Hydrometric Units (IHU) of the UK. Hydrometric Areas are used to organise river flow measurement and hydrometric data collection in the UK. Hydrometric Areas are either integral river catchments having one or more outlets to the sea or tidal estuary, or they may include several contiguous river catchments having topographical similarity but separate tidal outlets. In mainland Britain they are numbered from 1 to 97 in clockwise order around the coast commencing in north east Scotland. The larger islands and groups of islands are numbered from 100-108. Ireland has a unified numbering system from 1 to 40 commencing with the River Foyle catchment and circulating clockwise; not all Irish Hydrometric Areas, however, have an outlet to the coast. Only those Hydrometric Areas covering Great Britain and Northern Ireland are included in this dataset. The boundaries between hydrometric areas correspond to catchment boundaries as digitally-derived from CEH Integrated Hydrological Digital Terrain Model (IHDTM) using a catchment definition program. It should be noticed that the Northern Ireland data are clipped to its political boundary so not every Hydrometric Area in this region is completely represented. \n\nThe naming and numbering convention for the hydrometric areas in Great Britain was originally defined by the Inland Water Survey Committee (and first published in the Surface Water Year-Book of Great Britain 1936-37). For Northern Ireland the system was developed by a multi-agency working group in the 1970s (and first published in Surface Water: United Kingdom 1971-73. Note that full citations of those two publications are provided as additional information source. \n\nThis dataset represent the same entities as the IHU Hydrometric Areas of the UK without Coastline, however, the outer boundaries of the units follow coastline published by the Ordnance Survey (Meridian 2), rather than the boundaries of the CEH Integrated Hydrological Digital Terrain Model. ","distributionFormats":[{"name":"Shapefile","version":"unknown"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"distributor","email":"info@eidc.ac.uk"}],"id":"1957166d-7523-44f4-b279-aa5314163237","incomingCitationCount":3,"incomingCitations":[{"description":"Harrigan, S., Prudhomme, C., Parry, S., Smith, K., & Tanguy, M. (2018). Benchmarking ensemble streamflow prediction skill in the UK. Hydrology and Earth System Sciences, 22(3), 2023–2039.","url":"https://doi.org/10.5194/hess-22-2023-2018"},{"description":"Prosdocimi, I., Dupont, E., Augustin, N.H., Kjeldsen, T.R., Simpson, D.P., & Smith, T.R. (2019). Areal Models for Spatially Coherent Trend Detection: The Case of British Peak River Flows. Geophysical Research Letters, 46(22), 13054-13061. Portico.","url":"https://doi.org/10.1029/2019gl085142"},{"description":"Seibert, J., Vis, M.J.P., Lewis, E., & van Meerveld, H.J. (2018). Upper and lower benchmarks in hydrological modelling. Hydrological Processes, 32(8), 1120-1125. Portico.","url":"https://doi.org/10.1002/hyp.11476"}],"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/1957166d-7523-44f4-b279-aa5314163237.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset.","function":"information","type":"OTHER"}],"inspireThemes":[{"theme":"Hydrography","uri":"http://inspire.ec.europa.eu/theme/hy"}],"keywordsOther":[{"value":"hydrometric areas"},{"value":"hydrometry","uri":"http://www.eionet.europa.eu/gemet/concept/12128"},{"value":"Water Resources","uri":"http://onto.nerc.ac.uk/CEHMD/scienceArea/WR"},{"value":"Hydrology","uri":"http://onto.nerc.ac.uk/CEHMD/topic/9"},{"value":"Rees Section","uri":"http://onto.nerc.ac.uk/CEHMD/ReesSection"}],"keywordsPlace":[{"value":"United Kingdom","uri":"http://sws.geonames.org/2635167"},{"value":"Great Britain"},{"value":"Northern Ireland","uri":"http://sws.geonames.org/2641364"},{"value":"England","uri":"http://sws.geonames.org/6269131"},{"value":"Wales","uri":"http://sws.geonames.org/2634895"},{"value":"Scotland","uri":"http://sws.geonames.org/2638360"}],"licences":[{"value":"Licence, copyright and IPR apply","code":"license","uri":"https://eidc.ac.uk/licences/ihu/plain"}],"lineage":"The hydrometric areas are based on watershed derived from the Integrated Hydrological Digital Terrain Model (IHDTM) elevation grid using an in-house catchment definition program. In Great Britain the coastline corresponds to the OS Meridian2 coastline. In Northern Ireland the boundary and coastline was derived from OS Panorama data in times when Ordnance Survey covered Northern Ireland. All boundaries have been processed to ensure they are topologically correct; there are no gaps or overlaps so every point in the country is allocated to one and only one Hydrometric Area","metadataDate":"2026-06-27T19:53:59","notGEMINI":false,"onlineResources":[{"url":"https://data-package.ceh.ac.uk/data/1957166d-7523-44f4-b279-aa5314163237","name":"Download the data","description":"Download a copy of this data","function":"download","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/1957166d-7523-44f4-b279-aa5314163237.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset.","function":"information","type":"OTHER"},{"url":"https://catalogue.ceh.ac.uk/maps/cca47088-8cdd-4d7a-86b4-90f0a1766364?request=getCapabilities&service=WMS","name":"Map view service","description":"This link returns a WMS GetCapabilities response in XML format","type":"WMS_GET_CAPABILITIES"}],"pointsOfContact":[{"displayName":"National River Flow Archive","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"nrfa@ceh.ac.uk","address":{"deliveryPoint":"Maclean Building, Benson Lane, Crowmarsh Gifford","city":"Wallingford","administrativeArea":"Oxfordshire ","postalCode":"OX10 8BB","country":"United Kingdom"},"fullName":"National River Flow Archive","pointOfContact":"UK Centre for Ecology & Hydrology"}],"publicationDate":"2014-06-23T00:00:00.000Z","publishers":[{"organisationName":"NERC Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"}],"relationships":[{"relation":"http://purl.org/dc/terms/isPartOf","target":"33000ce7-7d1c-4be2-bebd-7b4160f3adfc"}],"resourceIdentifiers":[{"code":"1425380978274","codeSpace":"CEH:EIDC:"},{"code":"https://catalogue.ceh.ac.uk/id/1957166d-7523-44f4-b279-aa5314163237"},{"code":"10.5285/1957166d-7523-44f4-b279-aa5314163237","codeSpace":"doi"}],"resourceMaintenance":[{"frequencyOfUpdate":"asNeeded"}],"resourceType":{"value":"dataset"},"responsibleParties":[{"displayName":"National River Flow Archive","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"nrfa@ceh.ac.uk","address":{"deliveryPoint":"Maclean Building, Benson Lane, Crowmarsh Gifford","city":"Wallingford","administrativeArea":"Oxfordshire ","postalCode":"OX10 8BB","country":"United Kingdom"},"fullName":"National River Flow Archive","pointOfContact":"UK Centre for Ecology & Hydrology"},{"organisationName":"Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"owner","email":"nrfa@ceh.ac.uk","address":{"deliveryPoint":"Maclean Building, Benson Lane, Crowmarsh Gifford","city":"Wallingford","administrativeArea":"Oxfordshire ","postalCode":"OX10 8BB","country":"United Kingdom"}},{"displayName":"National River Flow Archive","organisationName":"Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"author","email":"nrfa@ceh.ac.uk","fullName":"National River Flow Archive"},{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"custodian","email":"info@eidc.ac.uk"},{"organisationName":"NERC Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"}],"spatialReferenceSystems":[{"code":"http://www.opengis.net/def/crs/EPSG/0/27700","title":"OSGB 1936 / British National Grid"}],"spatialRepresentationTypes":["vector"],"spatialResolutions":[{"distance":"50","uom":"m"}],"supplemental":[{"description":"Ministry of Health and Scottish Office (1939) The Surface Water Year-Book of Great Britain 1936-37. 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