1957166d-7523-44f4-b279-aa5314163237 English ISO/IEC 8859-1 (also known as Latin 1) dataset dataset NERC EDS Environmental Information Data Centre Lancaster Environment Centre, Library Avenue, Bailrigg Lancaster LA1 4AP UK info@eidc.ac.uk https://eidc.ac.uk/ EIDC website The Environmental Information Data Centre (EIDC) is the UK's national data centre for terrestrial and freshwater sciences. information pointOfContact 2026-01-09T12:18:24 UK GEMINI 2.3 OSGB 1936 / British National Grid Integrated Hydrological Units of the United Kingdom: Hydrometric Areas with Coastline 2014-06-23 publication 1425380978274 CEH:EIDC: https://catalogue.ceh.ac.uk/id/1957166d-7523-44f4-b279-aa5314163237 10.5285/1957166d-7523-44f4-b279-aa5314163237 doi: National River Flow Archive (2014). Integrated Hydrological Units of the United Kingdom: Hydrometric Areas with Coastline. NERC Environmental Information Data Centre 10.5285/1957166d-7523-44f4-b279-aa5314163237 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. The 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. This 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. Full details about this dataset can be found at https://doi.org/10.5285/1957166d-7523-44f4-b279-aa5314163237 National River Flow Archive UK Centre for Ecology & Hydrology nrfa@ceh.ac.uk pointOfContact Centre for Ecology & Hydrology nrfa@ceh.ac.uk owner National River Flow Archive Centre for Ecology & Hydrology nrfa@ceh.ac.uk author NERC EDS Environmental Information Data Centre info@eidc.ac.uk custodian NERC Environmental Information Data Centre info@eidc.ac.uk publisher asNeeded Hydrography theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication hydrometry GEMET - Concepts, version 4.1.3 2019-01-28 creation United Kingdom Northern Ireland England Wales Scotland GeoNames 2006-01-01 creation Water Resources Hydrology Rees Section Great Britain hydrometric areas otherRestrictions Registration is required to access this data otherRestrictions Licence, copyright and IPR apply otherRestrictions If you reuse this data, you should cite: National River Flow Archive (2014). Integrated Hydrological Units of the United Kingdom: Hydrometric Areas with Coastline. NERC Environmental Information Data Centre https://doi.org/10.5285/1957166d-7523-44f4-b279-aa5314163237 vector 50 English utf8 inlandWaters 2014-06-23 -8.648 1.768 49.864 60.861 Shapefile NERC EDS Environmental Information Data Centre info@eidc.ac.uk distributor https://data-package.ceh.ac.uk/data/1957166d-7523-44f4-b279-aa5314163237 Download the data Download a copy of this data download https://data-package.ceh.ac.uk/sd/1957166d-7523-44f4-b279-aa5314163237.zip Supporting information Supporting information available to assist in re-use of this dataset. information https://catalogue.ceh.ac.uk/maps/cca47088-8cdd-4d7a-86b4-90f0a1766364?request=getCapabilities&service=WMS Map view service This link returns a WMS GetCapabilities response in XML format dataset dataset Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 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