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The Hydrometric Areas dataset for the UK is now available via the EIDC Hub. The Hydrometric Areas for Great Britain and Northern Ireland are administrative groupings of river catchments at a sub-national level used in the organisation of UK river flow measurement and hydrometric data management. The boundaries between hydrometric areas correspond to catchment boundaries as digitally-derived from CEH Integrated Hydrological Terrain Model (IHDTM) using a catchment definition programme. Access the datasets.