NERC Data Catalogue Service
Integrated Hydrological Units of the United Kingdom: Catchments
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. This dataset was derived from the Integrated Hydrological Terrain Model. A Catchment represents the full area upstream from a Section outlet, which is a cell upstream of a confluence of two watercourses with known names. While Sections do not overlap, Catchments can overlap because one Catchment contains Catchments for all upstream Sections. 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/10.5285/10d419c8-8f65-4b85-a78a-3d6e0485fa1f
Simple
- Date (Publication)
- 2015-02-05
- Date (Creation)
- 2014-08-20
- Identifier
- CEH:EIDC: / 1425380855141
- Identifier
- doi: / 10.5285/10d419c8-8f65-4b85-a78a-3d6e0485fa1f
- Other citation details
- Kral, F., Fry, M., Dixon, H. (2015). Integrated Hydrological Units of the United Kingdom: Catchments. NERC Environmental Information Data Centre 10.5285/10d419c8-8f65-4b85-a78a-3d6e0485fa1f
- Maintenance and update frequency
- irregular Irregular
- Maintenance note
- New versions unlikely to be released more than annually.
- GEMET - INSPIRE themes, version 1.0
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- Hydrography
- Access constraints
- otherRestrictions Other restrictions
- Other constraints
- Registration is required to access this data
- Use constraints
- otherRestrictions Other restrictions
- Other constraints
- License terms and conditions apply
- Use constraints
- otherRestrictions Other restrictions
- Other constraints
- If you reuse this data, you should cite: Kral, F., Fry, M., Dixon, H. (2015). Integrated Hydrological Units of the United Kingdom: Catchments. NERC Environmental Information Data Centre https://doi.org/10.5285/10d419c8-8f65-4b85-a78a-3d6e0485fa1f
- Spatial representation type
- vector Vector
- Metadata language
- EnglishEnglish
- Character set
- utf8 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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File geodatabase
()
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File geodatabase
()
- OnLine resource
-
Download the data
Download a copy of this data
- OnLine resource
-
Supporting information
Supporting information available to assist in re-use of this dataset.
- OnLine resource
-
Map view service
This link returns a WMS GetCapabilities response in XML format
- Hierarchy level
- dataset Dataset
- Other
- dataset
Conformance result
- Date (Publication)
- 2010-12-08
- Statement
- 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.
- File identifier
- 10d419c8-8f65-4b85-a78a-3d6e0485fa1f XML
- Metadata language
- EnglishEnglish
- Character set
- ISO/IEC 8859-1 (also known as Latin 1) 8859 Part 1
- Hierarchy level
- dataset Dataset
- Hierarchy level name
- dataset
- Date stamp
- 2025-03-21T13:35:06
- Metadata standard name
- UK GEMINI
- Metadata standard version
- 2.3
Point of contact
NERC EDS Environmental Information Data Centre
Lancaster Environment Centre, Library Avenue, Bailrigg
,
Lancaster
,
LA1 4AP
,
UK
https://eidc.ac.uk/
Overviews
Spatial extent
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Provided by
Associated resources
Not available