Identification

Title

Compliance Assessment of Welsh River SACs against Phosphorus Targets

Alternative title(s)

Compliance with NRW River SAC Phosphorus Targets 2017-19 by Catchment Waterbodies.lyr

Phosphorus Sensitive SAC Freshwater Catchments.lyr

Abstract

Revisions to Joint Nature Conservation Committee (JNCC) monitoring guidance have required Natural Resources Wales (NRW) to review its conservation objectives for river Special Areas of Conservation (SACs) in Wales, notably with respect to phosphorus where targets have been substantially tightened. This data was created to identify compliance with the revised phosphorus targets for Welsh river SACs. Phosphorus concentration data were extracted from the NRW water quality database (KiWQM), for a three-year period from January 2017 to December 2019 for all sample points within water bodies in the nine SACs designated for one or more river features. These were Afon Gwyrfai a Llyn Cwellyn; Afon Eden – Cors Goch Trawsfynydd; Meirionnydd Oakwoods (Afon Glaslyn); Afon Teifi; Afon Tywi; Afonydd Cleddau; River Dee & Llyn Tegid; River Usk; and River Wye. In total, 125 water bodies (river sections) were in scope. Data were excluded where (i) detection limits were inadequate to assess compliance with the target or (ii) where the sample exceeded the recommended holding time of three days prior to analysis. Outliers in the data were identified and, if they were considered likely to be causing a failure on their own, data from other nutrient pollution indicators (biochemical oxygen demand, nitrate and ammonia) were checked to corroborate possible pollution events. The data consists of two products: 1. An Excel spreadsheet summarising results and 2. An ArcGIS layer consisting of the WFD catchment area water bodies, clipped to the Welsh border and excluding water bodies not overlapping with river SAC boundaries.

Resource type

dataset

Resource locator

https://datamap.gov.wales/layergroups/inspire-nrw:ComplianceAssessmentOfWelshRiverSacsAgainstPhosphorusTargets

name: Download data and Web Service

https://datamap.gov.wales/capabilities/layergroup/1113/?access_token=67k4GhAr91AqiAXnyngsm3l40RrZII&ows_service=wms

name: Web Mapping Service

Unique resource identifier

code

124865

codeSpace

https://naturalresources.wales

Dataset language

eng

Spatial reference system

authority code

OGP

code identifying the spatial reference system

urn:ogc:def:crs:EPSG::BNG

Additional information source

Hatton-Ellis TW, Jones TG. 2020. Compliance Assessment of Welsh River SACs against Phosphorus Targets. NRW Evidence Report No: 489, 95pp, Natural Resources Wales, Bangor

Classification of spatial data and services

Topic category

environment

inlandWaters

Keywords

Keyword set

keyword value

Hydrography

originating controlled vocabulary

title

reference date

date type

publication

effective date

2023-06-14

Geographic location

West bounding longitude

-5.77774100

East bounding longitude

-2.60886500

North bounding latitude

53.51306700

South bounding latitude

51.24082900

Extent

Extent group

authority code

title

reference date

date type

publication

effective date

2023-06-14

code identifying the extent

Wales (WLS)

Temporal reference

Temporal extent

Begin position

2017-01-01

End position

2022-08-19

Dataset reference date

date type

publication

effective date

2023-02-22

Frequency of update

notPlanned

Quality and validity

Lineage

1. Summarised from NRW KiWQM database; 2. WFD water bodies catchment layer on X drive. 3. The data was updated in June 2022 to correct mistakes in the original version

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

© CNC/NRW All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number 100019741. Crown Copyright and Database Right. Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and copyright of the owners. It is the recipient's responsibility to ensure the data is fit for the intended purpose.

Constraint set

Limitations on public access

There are no access restrictions on this data. NRW may release, publish or disseminate it freely.

Responsible organisations

Responsible party

organisation name

Natural Resources Wales (NRW)

telephone number

0300 065 3000

email address

enquiries@naturalresourceswales.gov.uk

responsible party role

owner

Responsible party

organisation name

Natural Resources Wales (NRW)

telephone number

0300 065 3000

email address

enquiries@naturalresourceswales.gov.uk

responsible party role

originator

Metadata on metadata

Metadata point of contact

organisation name

Natural Resources Wales (NRW)

telephone number

0300 065 3000

email address

enquiries@naturalresourceswales.gov.uk

responsible party role

pointOfContact

Metadata date

2023-06-13

Metadata language