Historic River Quality Objectives
Amcanion Ansawdd Afon Hynafol
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.
Roedd y dosbarthiad Amcanion Ansawdd Afon (RQO) yn cael ei ddefnyddio i gynllunio gwelliannau mewn ansawdd dŵr tan 2006 pan orffennodd y cynllun. Roedd RQOau yn cael eu rhoi i afonydd mawr (yn ddibynnol ar lif yr afon). Roedd samplau cemegol yn cael eu cymryd 12 gwaith y flwyddyn. Byddai unrhyw fethiannau yn ansawdd yr afon, eu rhesymau a'r gweithrediadau i'w rhoi ar waith, yn cael eu storio mewn tablau gwahanol. Daeth y cynllun dosbarthu RQO i ben yn niwedd 2006, ac mae bellach yn dabl sefydlog na ellir ei ddiweddaru.
Cydnabyddiaeth
Yn cynnwys gwybodaeth Cyfoeth Naturiol Cymru © Cyfoeth Naturiol Cymru a Hawl Cronfa Ddata. Cedwir pob hawl.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
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DynodyddIdentifier
- NRW_DS116327
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Teitl AmgenAlternative Title
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- AfA164 Historic River Quality Objectives
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Laith MetadataMetadata Language
- English
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Lineage
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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.
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Dyddiad cyfeirnod y set ddata (Cyhoeddiad)Dataset Reference Date (Publication)
- 2016-12-20
Temporal Extent
- Begin date
- 1997-01-01
- End date
- 2006-12-31
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Categori pwncTopic category
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Inland watersInland waters
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Extent
Extent
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HydGeographic Extent
- Wales (WLS)
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Distribution
Dosbarthiad
Distribution
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Fformat - Math a DisgrifiadFormat Type and Description
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Documents
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- Specification
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MS Excel
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Documents
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)
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Lleolwr AdnoddauResource Locator
- View and Download ( WWW:LINK-1.0-http--link )
Quality
Ansawdd Data
Data quality
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Cwmpas AnsawddQuality Scope
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DatasetDataset
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CydymffurfiadConformity
- 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
- Explanation
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
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Lineage
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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.
Keywords
Allweddair
Keywords
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MathType
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ThemeTheme
Dyfyniad
Citation
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Dyddiad (Cyhoeddiad)Date (Publication)
- 2008-06-01
Allweddair
Keywords
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NRW Thesaurus
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- river quality
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MathType
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ThemeTheme
Dyfyniad
Citation
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Dyddiad (Cyhoeddiad)Date (Publication)
- 2026-08-27
Allweddair
Keywords
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IPSV Subjects List
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- Water quality
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MathType
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ThemeTheme
Dyfyniad
Citation
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Dyddiad (Cyhoeddiad)Date (Publication)
- 2020-11-18
Allweddair
Keywords
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NRW SMNR Keywords
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- Hydrological Processes (SMNR)
- Water Quality (SMNR)
- Freshwater and Wetlands (SMNR)
- Management Areas (SMNR)
- Sustainable Management of Natural Resources (SMNR)
- Water Resources (SMNR)
- Ecosystem (SMNR)
- Physical Geography (Physiography) (SMNR)
- Natural Resources (Incl. Features and Processes) (SMNR)
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MathType
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ThemeTheme
Dyfyniad
Citation
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Dyddiad (Cyhoeddiad)Date (Publication)
- 2024-06-26
Spatial Reference System
- Code
- NONE
Content
Gwybodaeth Cynnwys
Content Information
Proffil CNC
NRW Profile
Elfennau CNC
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
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Math o GyfyngiadRestriction type
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Other restrictionsOther restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Use Constraints
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Cyfyngiadau DefnyddioUse constraints type
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Other restrictionsOther restrictions
- Other constraints
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© CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
Attribution Statement
- Other constraints
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Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
Licence
- Other constraints
- Open Government Licence
Metadata
Metadata
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Dynodydd FfeilFile Identifier
- 4f4c4942-4343-5764-6473-313136333237 XML
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Laith MetadataMetadata Language
- English
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Math o adnoddResource type
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DatasetDataset
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Dyddiad MetadataMetadata Date
- 2026-09-17T09:13:40.882Z
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Enw Safonol MetadataMetadata Standard Name
- NRW
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Fersiwn MetadataMetadata Standard Version
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1.0