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The data cover the period from March 2024 to March 2025. Sampling was carried out every four weeks by a team of researchers from UK Centre for Ecology & Hydrology. Stream samples were taken using a grab technique and filtered in the field. Rain samples were collected using bulk precipitation collectors. Data are presented for major anions and cations, pH, conductivity, alkalinity and in-situ measurements for the water temperature and stream flow for the six stream locations and air temperature and volume for the rainfall sites.","distributionFormats":[{"name":"Comma-separated values (CSV)","type":"text/csv","version":"unknown"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"distributor","email":"info@eidc.ac.uk"}],"funding":[{"funderName":"Natural Environment Research Council","funderIdentifier":"https://ror.org/02b5d8509","awardNumber":"NE/Y006208/1","orcid":false,"ror":true}],"hasOnlineServiceAgreement":true,"id":"bb431417-01e8-43e7-bfe5-e48441b2e091","incomingCitationCount":0,"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/bb431417-01e8-43e7-bfe5-e48441b2e091.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"keywordsOther":[{"value":"environmental chemistry","uri":"http://www.eionet.europa.eu/gemet/concept/2784"},{"value":"water quality","uri":"http://www.eionet.europa.eu/gemet/concept/9214"},{"value":"Wales"},{"value":"Plynlimon"}],"keywordsProject":[{"value":"Flood and Droughts Digital Research Infrastructure (FDRI)","uri":"https://digital.ceh.ac.uk/vocab/ra/5"}],"keywordsTheme":[{"value":"Water quality","uri":"http://onto.nerc.ac.uk/CEHMD/topic/16"}],"licences":[{"value":"This resource is available under the terms of the Open Government Licence","code":"license","uri":"https://eidc.ac.uk/licences/OGL/plain"}],"lineage":"This data presented follow on from the hydrochemical data sets presented in the data series Plynlimon Hydrochemistry data. The Plynlimon research catchments lie within the headwaters of the River Severn and the River Wye in the uplands of mid-Wales. Intensive and long-term monitoring within the catchments underpins a wealth of hydrological and hydro-chemical research. Monitoring is funded by the Centre for Ecology & Hydrology, and is ongoing since 1968.\nFieldwork was carried out by UKCEH members of staff trained in the fieldwork techniques required. Chemical analysis was carried out by qualified UKCEH chemists at laboratories at UKCEH Lancaster and UKCEH Bangor. Data was being checked and added to an Access database before being extracted to csv and uploaded to EIDC.","metadataDate":"2026-06-29T16:10:29","notGEMINI":true,"onlineResources":[{"url":"https://data-package.ceh.ac.uk/data/bb431417-01e8-43e7-bfe5-e48441b2e091","name":"Download the data","description":"Download a copy of this data","function":"download","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/bb431417-01e8-43e7-bfe5-e48441b2e091.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"pointsOfContact":[{"displayName":"Maud van Soest","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","fullName":"Maud van Soest","pointOfContact":"UK Centre for Ecology & Hydrology"}],"publicationDate":"2025-12-19T00:00:00.000Z","publishers":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"}],"relationships":[{"relation":"http://purl.org/dc/terms/isPartOf","target":"0392bf93-62b2-49f7-8c85-10038f22f0c0"}],"resourceIdentifiers":[{"code":"https://catalogue.ceh.ac.uk/id/bb431417-01e8-43e7-bfe5-e48441b2e091"},{"code":"10.5285/bb431417-01e8-43e7-bfe5-e48441b2e091","codeSpace":"doi"}],"resourceType":{"value":"dataset"},"responsibleParties":[{"displayName":"Maud van Soest","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","fullName":"Maud van Soest","pointOfContact":"UK Centre for Ecology & Hydrology"},{"familyName":"van Soest","givenName":"M. 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