4f4c4942-4343-5764-6473-313235323135 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2026-05-05T16:16:31.255Z NRW 1.0 wel NONE Large Raised Reservoir register (Locations and undertakers) Large Raised Reservoir register (Locations and undertakers) Cofrestr Cronfeydd Dŵr Dyrchafedig Mawr (Lleoliadau ac ymgymerwyr) 2026-04-30 NRW_DS125215 This dataset contains details of Large Raised Reservoirs in Wales. Natural Resources Wales (NRW) collects and maintains data on all reservoirs designed or capable of holding more than 10,000 cubic metres of water above the natural level of any part of the land adjoining them defined as 'large raised reservoirs' under the Reservoirs Act 1975. Two types of reservoir are maintained within the register: - Impounding; or - Non-Impounding. This dataset is an extract from NRW’s Cronfeydd/Reservoir Database. It contains information on the location, undertakers and engineers of the reservoirs. 'Undertaker' is the legal term used to identify who manages and controls the use of the reservoir and is responsible for maintaining compliance with the law. The undertaker is the person, people or company that uses a reservoir for a particular purpose. If there is no use, the owners or lessees are the undertakers. The undertaker may be different from the owner. If several people or organisations manage and control the reservoir, there can be more than one undertaker. This dataset contains details of Large Raised Reservoirs in Wales. Natural Resources Wales (NRW) collects and maintains data on all reservoirs designed or capable of holding more than 10,000 cubic metres of water above the natural level of any part of the land adjoining them defined as 'large raised reservoirs' under the Reservoirs Act 1975. Two types of reservoir are maintained within the register: - Impounding; or - Non-Impounding. This dataset is an extract from NRW’s Cronfeydd/Reservoir Database. It contains information on the location, undertakers and engineers of the reservoirs. 'Undertaker' is the legal term used to identify who manages and controls the use of the reservoir and is responsible for maintaining compliance with the law. The undertaker is the person, people or company that uses a reservoir for a particular purpose. If there is no use, the owners or lessees are the undertakers. The undertaker may be different from the owner. If several people or organisations manage and control the reservoir, there can be more than one undertaker. Mae'r set ddata hon yn cynnwys manylion cronfeydd dŵr uwch mawr. Mae Cyfoeth Naturiol Cymru (CNC) yn casglu a chynnal data ar bob cronfa ddŵr ddynodedig neu bob cronfa ddŵr sy'n gallu dal dros 10,000 metr ciwbig o ddŵr uwchben lefel naturiol unrhyw ran o'r tir sy'n ffinio arni, sy'n cael ei diffinio fel 'cronfa ddŵr uwch mawr' dan Ddeddf Cronfeydd Dŵr 1975. Mae dau fath o gronfeydd dŵr yn cael eu cynnal o fewn y gofrestr: - Cronfa sy'n cronni (argaeedig); neu - Cronfa nad yw'n cronni (pwmpio/dirwystr). Rhan o Gronfa Ddata Cronfeydd/Reservoir CNC yw’r set ddata hon. Mae'n cynnwys gwybodaeth am leoliad, ymgymerwyr a pheirianwyr y cronfeydd dŵr. 'Ymgymerwr' (‘Undertaker’ yn Saesneg) yw'r term cyfreithiol a ddefnyddir i nodi pwy sy'n rheoli defnydd y gronfa ddŵr ac sy'n gyfrifol am sicrhau cydymffurfiaeth â'r gyfraith. Yr ymgymerwr yw'r person, y bobl neu'r cwmni sy'n defnyddio cronfa ddŵr at ddiben benodol. Os nad oes defnydd, y perchnogion neu ddeiliaid y les yw'r ymgymerwyr. Gall yr ymgymerwr fod yn wahanol i'r perchennog. Os yw sawl person neu sefydliad yn rheoli'r gronfa ddŵr, gall fod mwy nag un ymgymerwr. Caiff y data hwn ei gasglu fel rhan o Gofrestr Gyhoeddus Deddf Cronfeydd Dŵr. Datganiad priodoli: Yn cynnwys gwybodaeth Cyfoeth Naturiol Cymru © Cyfoeth Naturiol Cymru a hawl cronfa ddata. Cedwir pob hawl. 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 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 Environmental monitoring facilities GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme flood risk management Reservoirs Act 1975 NRW Thesaurus 2026-03-04 geonetwork.thesaurus.local.theme.converted_nrw-keywords SeaDataNet Parameter Discovery Vocabulary 2024-06-19 geonetwork.thesaurus.external.theme.rdf+xml Reservoirs IPSV Subjects List 2020-11-18 geonetwork.thesaurus.external.theme.subjects Freshwater and Wetlands (SMNR) Natural Resources (Incl. Features and Processes) (SMNR) Ecosystem (SMNR) Flooding (SMNR) Water Resources (SMNR) Water Quality (SMNR) Hydrological Processes (SMNR) Sustainable Management of Natural Resources (SMNR) NRW SMNR Keywords 2024-06-26 geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords Access to this data may be restricted under relevant legislation. NRW may NOT publish or disseminate the data freely. no limitations © CNC/NRW Data may be re-used under provision and in line with the terms of a NRW licence. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. NRW Conditional English inlandWaters SeaVoX Vertical Co-ordinate Coverages 2021-01-06 Wales (WLS) -5.777741 -2.608865 51.240829 53.513067 1900-01-01 Delimited https://datamap.gov.wales/capabilities/layer/3505/?ows_service=wms OGC:WMS Web Mapping Services https://datamap.gov.wales/layers/geonode:nrw_large_raised_reservoirs_location_and_undertakers WWW:LINK-1.0-http--link Download data 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 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false This data is collected as part of the Reservoirs Act Public Register This data is collected as part of the Reservoirs Act Public Register