BGS Hosted Metadata
Integrated Hydrological Units of the United Kingdom: Groups
This dataset is part of Integrated Hydrological Units (IHU) of the UK, a set of geographical reference units for hydrological purposes including river flow measurement and hydrometric data collection. Groups represent the intermediate units of IHU in terms of spatial resolution. The most common size of a group is around 400 square kilometres. Each Group carries a name constructed from names of the major river flowing through the Group, the major river flowing into the Group, the major river into which the Group flows, and sometimes also from local county names. Each Group consists of one or more Section and Groups can be combined to form Hydrometric Areas without Coastline. Identifiers and attributes have been calculated so that direct upstream and direct downstream IHU units can be selected. This layer currently covers Great Britain only as no dataset with river geometries and names with suitable detail is available for Northern Ireland. Full details about this dataset can be found at https://doi.org/10.5285/f1cd5e33-2633-4304-bbc2-b8d34711d902
Simple
- Date (Publication)
- 2015-02-03
- Date (Creation)
- 2014-08-20
- Citation identifier
- CEH:EIDC: / 1425380901992
- Citation identifier
- https://catalogue.ceh.ac.uk/id/f1cd5e33-2633-4304-bbc2-b8d34711d902
- Citation identifier
- doi: / 10.5285/f1cd5e33-2633-4304-bbc2-b8d34711d902
- Other citation details
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Kral, F., Fry, M., Dixon, H. (2015). Integrated Hydrological Units of the United Kingdom: Groups. NERC Environmental Information Data Centre 10.5285/f1cd5e33-2633-4304-bbc2-b8d34711d902
- Point of contact
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Organisation name Individual name Electronic mail address Role UK Centre for Ecology & Hydrology Fry, M.
Point of contact Centre for Ecology & Hydrology Owner Centre for Ecology & Hydrology Kral, F.
Author Centre for Ecology & Hydrology Fry, M. Author Centre for Ecology & Hydrology Dixon, H. Author NERC EDS Environmental Information Data Centre Custodian NERC Environmental Information Data Centre Publisher
- Maintenance and update frequency
- Irregular
- Maintenance note
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New versions unlikely to be released more than annually.
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GEMET - INSPIRE themes, version 1.0
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Hydrography
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GEMET - Concepts, version 4.1.3
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GeoNames
- Keywords
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- Hydrology
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Great Britain
- Access constraints
- Other restrictions
- Other constraints
- Registration is required to access this data
- Use constraints
- Other restrictions
- Other constraints
- Licence terms and conditions apply
- Use constraints
- Other restrictions
- Other constraints
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If you reuse this data, you should cite: Kral, F., Fry, M., Dixon, H. (2015). Integrated Hydrological Units of the United Kingdom: Groups. NERC Environmental Information Data Centre https://doi.org/10.5285/f1cd5e33-2633-4304-bbc2-b8d34711d902
- Spatial representation type
- Vector
- Language
- English
- Character set
- UTF8
- Topic category
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- Inland waters
- Begin date
- 2014-08-20
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- Unique resource identifier
- OSGB 1936 / British National Grid
- Distribution format
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Name Version File geodatabase
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS Environmental Information Data Centre
Distributor
- OnLine resource
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Protocol Linkage Name https://data-package.ceh.ac.uk/data/f1cd5e33-2633-4304-bbc2-b8d34711d902 Download the data
- OnLine resource
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Protocol Linkage Name https://data-package.ceh.ac.uk/sd/f1cd5e33-2633-4304-bbc2-b8d34711d902.zip Supporting information
- OnLine resource
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Protocol Linkage Name https://catalogue.ceh.ac.uk/maps/cca47088-8cdd-4d7a-86b4-90f0a1766364?request=getCapabilities&service=WMS Map view service
- Hierarchy level
- Dataset
- Other
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dataset
Conformance result
- Title
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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
- Date (Publication)
- 2010-12-08
- Statement
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The main inputs for development of Integrated Hydrological Units (IHU) of the UK were data held by the Centre for Ecology & Hydrology. Specifically, the cumulative catchment area raster and outflow raster from the Integrated Hydrological Digital Terrain Model (IHDTM) [1]. The vast majority of the watercourse names come from the subset of CEH UK river centreline network enriched by names from Ordnance Survey 1:50K Gazetteer [2]. Some names were obtained from or verified using other readily available sources like OpenStreetMap (openstreetmap.org) and WikiPedia (wikipedia.org). Bespoke FORTRAN functions, part of the CEH Flood Estimation Handbook code set, were used for catchment delineation. These functions enable sensible interlocking catchments boundaries to be created for the whole IHDTM surface. The option that does not leave gaps between catchments was specified [1]. Except for the catchment delineation, ArcGIS was used as the main GIS platform. Custom Python code was developed to drive the whole process and to perform hierarchical and network tasks. The full name of each IHU Section was derived from three rivers defining the section: the largest (in terms of cumulative catchment area) inflowing river other than the main river in the Section, the main river in the Section, and the largest river flowing into the downstream Section. If no such inflows exist, words 'Source', 'Sea', or the name of the main river in the downstream Section are used as appropriate. A similar approach was adopted for IHU Group names, although group names were edited manually to a great extent to ensure they are simple and readily understood. [1] Morris, D.G. and Flavin, R.W. 1990. A Digital Terrain Model for Hydrology. Proc 4th Int. Symposium on Spatial Data Handling. Zurich, 1, 250-262. [2] Moore R V, Morris D G and Flavin R W, 1994. Sub-set of UK digital 1:50,000 scale river centreline network. NERC, Institute of Hydrology, Wallingford.
Metadata
- File identifier
- f1cd5e33-2633-4304-bbc2-b8d34711d902 XML
- Metadata language
- English
- Character set
- 8859 Part 1
- Hierarchy level
- Dataset
- Hierarchy level name
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dataset
- Date stamp
- 2026-01-09T12:17:42
- Metadata standard name
- UK GEMINI
- Metadata standard version
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2.3
- Metadata author
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Organisation name Individual name Electronic mail address Role NERC EDS Environmental Information Data Centre Point of contact
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