Nutrient Modelling for Llangorse Lake

Llangorse Lake is the largest natural eutrophic lake in Wales and has been designated as a Site of Special Scientific Interest (SSSI) and a Special Area of Conservation (SAC). The lake has a history of eutrophication and so it was decided to undertake a nutrient modelling and nutrient budget exercise to determine the size and sources of nutrient loads entering the lake. Llangorse Lake has a history of eutrophication problems believed to have been caused by high nutrient loads entering the lake from the surrounding catchment. This study aimed to determine the size and main sources of those loads. Specific objectives include: - To review existing data and information on the water quality of Llangorse Lake. - To conduct a field study to investigate the nutrient budget of the lake. - To model the nutrient delivery from the catchment to the lake, with particular focus on phosphorus delivery, to give an indication of source apportionment. - To prepare a draft catchment management plan.

Identification

Identifier
NRW_DS110067
Alternative Title
Metadata Language
English
Lineage

The nutrient load to the lake was estimated from nutrient concentrations and flows measured on the inflow streams. Nutrient concentrations were also measured in the outflow to provide an indication of lake water quality. The 8 monitoring sites were chosen to include the main drainage channels into and out of the lake and with sampling points located as close to the lake as practically possible. Water and flow sampling was conducted at fortnightly intervals for one year. Hydraulic load to the lake was calculated as were nutrient concentration in the lake inflows- specifically phosphorous and nitrate. Phosphorous concentrations in the sediments were collected and analysed.
Dataset Reference Date (Publication)
2008-12-31

Temporal Extent

Begin date
2006-10-10
End date
2007-09-25
 
Topic category
  • Environment
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Originator
  Centre for Ecology and Hydrology (CEH) -
Environment Centre Wales, Deiniol Road, Bangor, Gwynedd, LL57 2UW, Wales
http://www.ceh.ac.uk/
 

Extent

Extent

Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 
 

Distribution

Format Type and Description
  • Documents ( )

    Specification

    Report in Word and PDF format Electronic versions of the figures contained in the report in *.tif format Data collected in excel spreadsheets

 

Quality

Data quality

Quality Scope
Dataset
Conformity
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

This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
Degree
false
Lineage

The nutrient load to the lake was estimated from nutrient concentrations and flows measured on the inflow streams. Nutrient concentrations were also measured in the outflow to provide an indication of lake water quality. The 8 monitoring sites were chosen to include the main drainage channels into and out of the lake and with sampling points located as close to the lake as practically possible. Water and flow sampling was conducted at fortnightly intervals for one year. Hydraulic load to the lake was calculated as were nutrient concentration in the lake inflows- specifically phosphorous and nitrate. Phosphorous concentrations in the sediments were collected and analysed.
 

Keywords

Keywords

GEMET - INSPIRE themes, version 1.0
Type
Theme

Citation

Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus
  • nutrient budget
  • Lakes (Limnology)
  • SSSI (Sites of Special Scientific Interest)
  • Marine & Freshwater Science Group (MFSG)
  • nutrient load
  • nutrients
  • Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC)
  • Llangorse Lake (llyn Safadden)
  • nitrates (nitrogen)
  • eutrophication
Type
Theme

Citation

Date (Publication)
2026-08-27
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Content Information

NRW Profile

Custom Elements

NRW Related Title

Nutrient modelling and a nutrient budget for Llangorse Lake
 

Constraints

Constraints

Limitations on Public Access and Use

Restriction type
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

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

Use Constraints

Use constraints type
Other restrictions
Other constraints

© 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.
 
 
 

Metadata

Metadata

File Identifier
4f4c4942-4343-5764-6473-313130303637 XML
Metadata Language
English
Resource type
Dataset
Metadata Date
2026-09-28T13:29:19.924Z
Metadata Standard Name
NRW
Metadata Standard Version

1.0

pointOfContact
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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