Nutrient Review - Phosphorus and Nitrate Loading From Consented Discharges
Estimated phosphorus and nitrate loading from consented discharges for sites with a numerical limit on phosphorus (kg/yr)
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS125607
- Alternative Title
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- Nitrogen and Phosphorus Loading from Consented Discharges.lyr
- Metadata Language
- English
- Lineage
-
Data was extracted from NRW’s lists of discharge consents. The lists (a static WIMS dataset from 2016 and a live PALS extract from 2022) were combined, taking the more recent data where there were multiple or conflicting sources of information. As each discharge may have multiple consent lines describing different conditions, the analysis was carried out on the assumption that each consent reference represents one discharge. Duplicate sites were then removed where appropriate. CSOs and storm overflows were removed, as the consents do not generally give a good indication of discharged flows or loadings. An initial list of all discharges with a flow consent was created. This encompassed consents with “Flow” in the description (determined and codes 6425, 3527, 7782, 6426, 9827, 9843, 7435, 37). These were calculated to generate annual flows as follows: • Dry weather flow consents were multiplied by 1.3 to estimate mean daily flow • Maximum or total daily flows were multiplied by 0.5 to estimate mean daily flow • Hourly mean or weekly flows were treated as means for those time periods, and multiplied up to estimate mean daily flow • Instantaneous maximum flow was multiplied by 0.5 to estimate mean daily flow Mean daily flow was then multiplied up to estimate total average annual flow in l/yr for each discharge. Each of these discharges were then checked for nitrogen and phosphorus consents.
- Topic category
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- Environment
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Distribution
- Format Type and Description
-
-
Geographic Information System
Geographic Information System
()
- Specification
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ESRI Feature Class
-
Geographic Information System
Geographic Information System
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
Data was extracted from NRW’s lists of discharge consents. The lists (a static WIMS dataset from 2016 and a live PALS extract from 2022) were combined, taking the more recent data where there were multiple or conflicting sources of information. As each discharge may have multiple consent lines describing different conditions, the analysis was carried out on the assumption that each consent reference represents one discharge. Duplicate sites were then removed where appropriate. CSOs and storm overflows were removed, as the consents do not generally give a good indication of discharged flows or loadings. An initial list of all discharges with a flow consent was created. This encompassed consents with “Flow” in the description (determined and codes 6425, 3527, 7782, 6426, 9827, 9843, 7435, 37). These were calculated to generate annual flows as follows: • Dry weather flow consents were multiplied by 1.3 to estimate mean daily flow • Maximum or total daily flows were multiplied by 0.5 to estimate mean daily flow • Hourly mean or weekly flows were treated as means for those time periods, and multiplied up to estimate mean daily flow • Instantaneous maximum flow was multiplied by 0.5 to estimate mean daily flow Mean daily flow was then multiplied up to estimate total average annual flow in l/yr for each discharge. Each of these discharges were then checked for nitrogen and phosphorus consents.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- nitrates (nitrogen)
- Nitrate directive
- phosphates
- phosphorus
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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Restriction on this data have not been fully determined, however a preliminary assessment indicate part of this dataset is sensitive, and access may be restricted under relevant legislation. NRW may NOT release, publish or disseminate the sensitive data
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW NRW does NOT grant permission to third parties to re-use or disseminate the full dataset. Subject to a full assessment, a redacted version of the data may be re-used under provision and in line with the terms of a NRW licence.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313235363037 XML
- Metadata Language
- English
- Parent Identifier
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Nutrients Review 2023
NRW_DS125601
- Resource type
- Dataset
- Metadata Date
- 2024-05-30T15:37:46.308Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0