4f4c4942-4343-5764-6473-313235343337 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2025-05-09T16:06:32.779Z NRW 1.0 wel British National Grid (EPSG::27700) Internal Drainage Districts (IDD) Internal Drainage Districts (IDD) Ardaloedd Draenio Mewnol IDD CWL Tidal Flaps.lyr IDD Watercourses.ly IDD Pumping Stations.lyr IDD Boundaries.lyr IDD Sluices.lyr 2023-01-17 NRW_DS125437 Drainage districts are typically found in low-Iying land where boundaries are determined by physical, not, political attributes. Districts vary in nature and size, from the mainly agricultural (such as Conwy, Llanfrothen and Towyn) to the semi-urban (such as the Gwent Levels). Drainage districts are at risk from various sources of flooding. Without flood risk and water level management, drainage districts would be unsuitable to live in and would not protect and provide for the variety of agricultural land, utilities and transport networks that have developed within their boundaries.  This dataset shows the location of the boundaries of IDD's within Wales including the maintained watercourses, tidal flaps, pumping stations and for for Caldicot & Wentlooge Levels & Lower Wye and Powysland it also shows locations of sluices. Current Drainage Districts as of 2022: Afon Ganol Ardudwy Marsh, Borth Bog, Caldicot & Wentlooge Levels & Lower Wye (Gwent Levels), Dysynni Valley, Glaslyn - Pensyflog, Harlech & Maentwrog, Llanfrothen, Malltraeth Marsh, Mawddach & Wnion, Powysland, River Conwy, Towyn. Drainage districts are typically found in low-Iying land where boundaries are determined by physical, not, political attributes. Districts vary in nature and size, from the mainly agricultural (such as Conwy, Llanfrothen and Towyn) to the semi-urban (such as the Gwent Levels). Drainage districts are at risk from various sources of flooding. Without flood risk and water level management, drainage districts would be unsuitable to live in and would not protect and provide for the variety of agricultural land, utilities and transport networks that have developed within their boundaries.  This dataset shows the location of the boundaries of IDD's within Wales including the maintained watercourses, tidal flaps, pumping stations and for for Caldicot & Wentlooge Levels & Lower Wye and Powysland it also shows locations of sluices. Current Drainage Districts as of 2022: Afon Ganol Ardudwy Marsh, Borth Bog, Caldicot & Wentlooge Levels & Lower Wye (Gwent Levels), Dysynni Valley, Glaslyn - Pensyflog, Harlech & Maentwrog, Llanfrothen, Malltraeth Marsh, Mawddach & Wnion, Powysland, River Conwy, Towyn. Mae rhanbarthau draenio ar dir isel fel arfer, ac mae eu ffiniau wedi’u pennu gan nodweddion ffisegol, yn hytrach na gwleidyddol. Mae’r rhanbarthau’n amrywio o ran natur a maint. Mae rhai’n rhanbarthau amaethyddol gan mwyaf (fel Conwy, Llanfrothen a Thywyn) a rhai’n lled drefol (fel Gwastadeddau Gwent). Mae rhanbarthau draenio yn wynebu perygl llifogydd o ffynonellau amrywiol. Heb weithgareddau i reoli lefel y dŵr a pherygl llifogydd, ni fyddai rhanbarthau draenio yn lleoedd addas i fyw ynddyn nhw. Ni fydden nhw chwaith yn diogelu nac yn darparu ar gyfer y tir amaethyddol, y cyfleustodau a’r rhwydweithiau trafnidiaeth amrywiol sydd wedi datblygu o fewn eu ffiniau. Mae'r set ddata hon yn dangos lleoliad ffiniau Ardaloedd Draenio Mewnol yng Nghymru gan gynnwys y cyrsiau dŵr a gynhelir, fflapiau llanw, gorsafoedd pwmpio ac, ar gyfer Gwastadeddau Cil-y-coed a Gwynllŵg a Phowystir, mae hefyd yn dangos lleoliadau llifddorau. Ardaloedd Draenio Cyfredol 2022: Afon Ganol Cors Ardudwy Cors Borth Lefelau Cil-y-Coed a Gwynllŵg a Gwy Isaf (Lefelau Gwent) Dyffryn Dysynni Glaslyn - Pensyflog Harlech a Maentwrog Llanfrothen Cors Malltraeth Mawddach ac Wnion Powysland Afon Conwy Towyn Datganiad priodoli: Yn cynnwys gwybodaeth Cyfoeth Naturiol Cymru © Cyfoeth Naturiol Cymru a Chronfa Ddata Hawl. 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 Environment Agency (EA) Millbank Tower, 25th Floor, 21//24 Millbank, London, SW1P 4XL, England enquiries@environment-agency.gov.uk http://www.environment-agency.gov.uk/ Environment Agency Wales Environment Agency Wales, Cambria House, 29 Newport Road, Cardiff, CF24 0TP enquiries@environment-agency.gov.uk http://www.environment-agency.gov.uk/regions/wales Internal Drainage Board (IDB) Environment Agency Wales, Cambria House, 29 Newport Road, Cardiff, CF24 0TP Not Provided Not Provided Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Hydrography GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme drainage flood defence NRW Thesaurus 2025-01-08 geonetwork.thesaurus.local.theme.converted_nrw-keywords SeaDataNet Parameter Discovery Vocabulary 2024-06-19 geonetwork.thesaurus.external.theme.rdf+xml IPSV Subjects List 2020-11-18 geonetwork.thesaurus.external.theme.subjects NRW SMNR Keywords 2024-06-26 geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords There are no access restrictions on 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 intended purpose. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Open Government Licence English inlandWaters SeaVoX Vertical Co-ordinate Coverages 2021-01-06 Wales (WLS) -5.777741 -2.608865 51.240829 53.513067 2008-01-01 2014-01-31 Geographic Information System Unknown ESRI Feature Class https://datamap.gov.wales/layergroups/geonode:nrw_internal_drainage_district WWW:LINK-1.0-http--link View and Download https://datamap.gov.wales/capabilities/layergroup/4185/?ows_service=wms OGC:WMS Web Mapping Service 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 North IDDs – Digitised from old paper maps dating back to the Gwynedd River Authority days. South IDDs - Digitised from old paper maps North IDDs – Digitised from old paper maps dating back to the Gwynedd River Authority days. South IDDs - Digitised from old paper maps