4f4c4942-4343-5764-6473-313130303637 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2024-05-31T09:14:23.984Z NRW 1.0 wel British National Grid (EPSG::27700) Nutrient Modelling for Llangorse Lake Nutrient Modelling for Llangorse Lake Modelu maetholion ar gyfer Llyn Llan-gors 2008-12-31 NRW_DS110067 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. 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. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Centre for Ecology and Hydrology (CEH) Environment Centre Wales, Deiniol Road, Bangor, Gwynedd, LL57 2UW, Wales enquiries@ceh.ac.uk http://www.ceh.ac.uk/ Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Environmental monitoring facilities Environmental monitoring facilities GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Llangorse Lake (llyn Safadden) Lakes (Limnology) SSSI (Sites of Special Scientific Interest) Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC) eutrophication nutrients nitrates (nitrogen) nutrient load nutrient budget Marine & Freshwater Science Group (MFSG) NRW Thesaurus NRW Thesaurus 2023-12-31 geonetwork.thesaurus.local.theme.converted_nrw-keywords There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations © 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. English environment SeaVoX Vertical Co-ordinate Coverages SeaVoX Vertical Co-ordinate Coverages 2021-01-06 Wales (WLS) -3.34517933 -3.21100093 51.8897662 51.96144129 2006-10-10 2007-09-25 Nutrient modelling and a nutrient budget for Llangorse Lake Documents Report in Word and PDF format Electronic versions of the figures contained in the report in *.tif format Data collected in excel spreadsheets 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 2010-12-08 false 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. 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.