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Data for over 50 chemical determinands are presented alongside data for some in-situ measurements such as water temperature. Full descriptions of the analytical methods used for each determinand is included. Intensive and long-term monitoring within the catchments underpins a wealth of hydrological and hydro-chemical research; other linked datasets include river flow, meteorology and a variety of detailed spatial datasets representing the topography, soils and rivers of the catchments. Monitoring is funded by the Centre for Ecology & Hydrology.","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"}],"id":"68f4a12f-740d-4705-9c27-6a7fb7127046","incomingCitationCount":0,"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/68f4a12f-740d-4705-9c27-6a7fb7127046.zip","name":"Supporting documentation","description":"Documents available to assist with re-use of this dataset","function":"information","type":"OTHER"}],"inspireThemes":[{"theme":"Environmental Monitoring Facilities","uri":"http://inspire.ec.europa.eu/theme/ef"}],"keywordsOther":[{"value":"rainfall"},{"value":"stream"},{"value":"groundwater","uri":"http://www.eionet.europa.eu/gemet/concept/3780"},{"value":"river","uri":"http://www.eionet.europa.eu/gemet/concept/7244"}],"keywordsPlace":[{"value":"Vyrnwy"},{"value":"Wales","uri":"http://sws.geonames.org/2634895"},{"value":"United Kingdom","uri":"http://sws.geonames.org/2635167"}],"keywordsTheme":[{"value":"Water quality","uri":"http://onto.nerc.ac.uk/CEHMD/topic/16"}],"licences":[{"value":"Licence terms and conditions apply","code":"license","uri":"https://eidc.ac.uk/licences/standard-click-through/plain"}],"lineage":"Originally designed to improve understanding of water use by coniferous forests, monitoring within the Plynlimon/Vyrnwy research catchments has subsequently developed into a multi-disciplinary project underpinning a wealth of hydrological research. The stream hydrochemistry dataset is a combination of chemical determinands and in-situ physical properties. Samples are taken on an approximately weekly basis and analysed in laboratories for approximately 50 chemical determinands. The laboratory analysis has been undertaken at different locations using different equipment during the years of monitoring represented within the dataset. Details of the analytical methods used for each determinand are included within the dataset. The information provided is presented as raw data which have not been modified to include \"less than\" values when the numbers are less than the lowest quotable value. This is done so as to allow the data to be used for research purposes including detailed statistical analysis where inclusion of less than values would be problematic. The data are thus \"uncensored\" for research purposes and include in places values that are negative due to analytical uncertainties and the extremely low concentrations of some of the determinands. The data are provided in good faith with the expectation that they will be used in a positive and constructive manner. It is up to the user to resolve which way to use and interpret the data and information on full methodologies and less than values is provided within the metadata files. We whole heartedly encourage the use of these data for research and educational purposes bearing in mind that it is uncensored data and that over the years research directions have evolved to reflect changing project and funding priorities while analytical methodologies have changed. The data provide a legacy from many years' research involving scientists, analysts and field workers who in many cases have now retired. While we have done our best to provide all the information possible, in many cases it will be not be possible to respond to detailed enquiries about the earlier parts of the record. ","metadataDate":"2026-06-27T19:10:43","notGEMINI":false,"onlineResources":[{"url":"https://data-package.ceh.ac.uk/data/68f4a12f-740d-4705-9c27-6a7fb7127046","name":"Download the data","description":"Download a copy of this data","function":"download","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/68f4a12f-740d-4705-9c27-6a7fb7127046.zip","name":"Supporting documentation","description":"Documents available to assist with re-use of this dataset","function":"information","type":"OTHER"}],"pointsOfContact":[{"familyName":"Norris","givenName":"D.","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Environment Centre for Wales, Deiniol Road","city":"LL57 2UW Bangor","country":"Unitied Kingdom"},"fullName":"Norris, D.","pointOfContact":"UK Centre for Ecology & Hydrology"}],"publicationDate":"2013-02-08T00:00:00.000Z","publishers":[{"organisationName":"NERC Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"}],"resourceIdentifiers":[{"code":"1359546603078","codeSpace":"CEH:EIDC:"},{"code":"https://catalogue.ceh.ac.uk/id/68f4a12f-740d-4705-9c27-6a7fb7127046"},{"code":"10.5285/68f4a12f-740d-4705-9c27-6a7fb7127046","codeSpace":"doi"}],"resourceMaintenance":[{"frequencyOfUpdate":"unknown"}],"resourceType":{"value":"dataset"},"responsibleParties":[{"familyName":"Norris","givenName":"D.","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Environment Centre for Wales, Deiniol Road","city":"LL57 2UW Bangor","country":"Unitied Kingdom"},"fullName":"Norris, D.","pointOfContact":"UK Centre for Ecology & Hydrology"},{"familyName":"Reynolds","givenName":"B.","organisationName":"Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"author","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Environment Centre Wales, Deiniol Road ","city":"Bangor","administrativeArea":"Gwynedd","postalCode":"LL57 2UW","country":"United Kingdom"},"fullName":"Reynolds, B."},{"familyName":"Neal","givenName":"C.","organisationName":"Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"author","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Maclean Building, Benson Lane, Crowmarsh Gifford","city":"Wallingford","administrativeArea":"Oxfordshire ","postalCode":"OX10 8BB","country":"United Kingdom"},"fullName":"Neal, C."},{"familyName":"Kirchner","givenName":"J.","organisationName":"ETH Zurich","role":"author","email":"enquiries@ceh.ac.uk","fullName":"Kirchner, J."},{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"custodian","email":"info@eidc.ac.uk"},{"organisationName":"NERC Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"}],"spatialReferenceSystems":[{"code":"http://www.opengis.net/def/crs/EPSG/0/27700","title":"OSGB 1936 / British National Grid"}],"spatialRepresentationTypes":["textTable"],"supplemental":[{"description":"Neal, C., Reynolds, B., Norris, D., Kirchner, J. W., Neal, M., Rowland, P., … Wright, D. (2011). Three decades of water quality measurements from the Upper Severn experimental catchments at Plynlimon, Wales: an openly accessible data resource for research, modelling, environmental management and education. Hydrological Processes, 25(24), 3818-3830. ","url":"https://doi.org/10.1002/hyp.8191","function":"relatedArticle"}],"temporalExtents":[{"begin":"1994-10-07","end":"2001-02-16"}],"title":"Vyrnwy research catchment hydrochemistry","topicCategories":[{"value":"inlandWaters","uri":"http://inspire.ec.europa.eu/metadata-codelist/TopicCategory/inlandWaters"}],"topics":["http://onto.nerc.ac.uk/CEHMD/topic/16"],"type":"dataset","uri":"https://catalogue.ceh.ac.uk/id/68f4a12f-740d-4705-9c27-6a7fb7127046","useConstraints":[{"value":"Licence terms and conditions apply","code":"license","uri":"https://eidc.ac.uk/licences/standard-click-through/plain"},{"value":"you must acknowledge the following resource: Neal, C., Reynolds, B., Kirchner, J.W., Rowland, P., Norris, D., Sleep, D., Lawlor, A., Woods, C., Thacker, S., Guyatt, H., Vincent, C., Lehto, K., Grant, S., Williams, J., Neal, M., Wickham, H., Harman, S., Armstrong, L. (2013) High-frequency precipitation and stream water quality time series from Plynlimon, Wales: an openly accessible data resource spanning the periodic table. Hydrological Processes, in press.","code":"otherRestrictions"}]}