Historic River Quality Objectives
The River Quality Objectives (RQO) classification was used for planning water quality improvements until 2006 when the scheme ended. The national RQO classification scheme ceased at the end of 2006, it is now a fixed table which will not be updated. RQO compliance figures are available for 1997-2006.
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- NRW_DS116327
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- Amcanion Ansawdd Afonydd Hanesyddol
- AfA164 Historic River Quality Objectives
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- English
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RQOs were assigned to all significantly sized rivers (based on river flow). RQOs were based on the River Ecosystem (RE) Classification Scheme which was introduced in 1994 to replace the National Water Council's methodology. The RE system consists of five classes (1-5) based on the same determinands used in the General Quality Assessment (GQA) chemistry assessment of Biochemical Oxygen Demand (BOD), ammonia and dissolved oxygen but also includes the additional determinands of (free (or un-ionised) ammonia, pH, hardness, dissolved copper and total zinc) that reflect the requirements of a river ecosystem. Chemical samples were taken 12 times a year. Any river quality failures, their reasons and actions to be taken, were stored in separate tables.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2016-12-20
Ystod amser
- Dyddiad cychwyn
- 1997-01-01
- Dyddiad gorffen
- 2006-12-31
- Categori pwnc
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- Inland waters
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RQOs were assigned to all significantly sized rivers (based on river flow). RQOs were based on the River Ecosystem (RE) Classification Scheme which was introduced in 1994 to replace the National Water Council's methodology. The RE system consists of five classes (1-5) based on the same determinands used in the General Quality Assessment (GQA) chemistry assessment of Biochemical Oxygen Demand (BOD), ammonia and dissolved oxygen but also includes the additional determinands of (free (or un-ionised) ammonia, pH, hardness, dissolved copper and total zinc) that reflect the requirements of a river ecosystem. Chemical samples were taken 12 times a year. Any river quality failures, their reasons and actions to be taken, were stored in separate tables.
Allweddeiriau
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NRW SMNR Vocabulary
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- Water Resources (SMNR)
- Physical Geography (physiography) (SMNR)
- Freshwater and Wetlands (SMNR)
- Sustainable Management of Natural Resources (SMNR)
- Ecosystem (SMNR)
- Management Areas (SMNR)
- Natural Resources (incl. Features and Processes) (SMNR)
- Water Quality (SMNR)
- Hydrological Processes (SMNR)
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- 2023-12-27
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- 2024-05-31T09:14:21.838Z
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