{"id":153,"date":"2023-11-23T12:33:01","date_gmt":"2023-11-23T12:33:01","guid":{"rendered":"https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/llanfair-dyffryn-clwyd\/"},"modified":"2025-12-17T13:42:10","modified_gmt":"2025-12-17T13:42:10","slug":"llanfair-dyffryn-clwyd","status":"publish","type":"page","link":"https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/llanfair-dyffryn-clwyd\/","title":{"rendered":"Llanfair Dyffryn Clwyd"},"content":{"rendered":"\t\t\t<section class=\"hero-section hero-section-with-social\">\n\t\t\t\t\t\t\t\t<div class=\"hero-info-wrap\">\n\t\t\t\t\t<div class=\"container\">\n\t\t\t\t\t\t<div class=\"row\">\n\t\t\t\t\t\t\t<div class=\"col-12\">\n\t\t\t\t\t\t\t\t<div class=\"hero-info\">\n\t\t\t\t\t\t\t\t\t<h1>Llanfair Dyffryn Clwyd<\/h1>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n\t\t\t<div class=\"social-wrap social-wrap-inline-them\">\n\t\t\t\t<div class=\"sea-background-f\">\n\t\t\t\t\t<span>Share this article<\/span><a target=\"_blank\"  href=\"https:\/\/www.facebook.com\/sharer\/sharer.php?u=https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/llanfair-dyffryn-clwyd\/\"><span class=\"icon-facebook\"><span class=\"hidden\">Facebook<\/span><\/span><\/a><a target=\"_blank\"  href=\"https:\/\/twitter.com\/intent\/tweet?text=Llanfair%20Dyffryn%20Clwyd&#038;url=https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/llanfair-dyffryn-clwyd\/\"><span class=\"icon-twitter\"><span class=\"hidden\">Twitter<\/span><\/span><\/a><a   onclick=\"javascript:void( (function() {var e=document.createElement('script' );e.setAttribute('type','text\/javascript' );e.setAttribute('charset','UTF-8' );e.setAttribute('src','\/\/assets.pinterest.com\/js\/pinmarklet.js?r='+Math.random()*99999999);document.body.appendChild(e)})());\"  href=\"javascript:void(0);\"><span class=\"icon-pinterest\"><span class=\"hidden\">Pinterest<\/span><\/span><\/a><a target=\"_blank\"  href=\"https:\/\/wa.me?text=https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/llanfair-dyffryn-clwyd\/\"><span class=\"icon-whatsapp\"><span class=\"hidden\">WhatsApp<\/span><\/span><\/a><a   href=\"mailto:?subject=Llanfair%20Dyffryn%20Clwyd&#038;body=%20(https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/llanfair-dyffryn-clwyd\/)\"><span class=\"icon-mail\"><span class=\"hidden\">Email<\/span><\/span><\/a><a href=\"#\" data-copy=\"https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/llanfair-dyffryn-clwyd\/\" class=\"copy-url-on-click\"><span class=\"icon-link\"><span class=\"hidden\">Copy Link<\/span><\/span><\/a><\/div><\/div>\t\t\t\t\t\t\t<\/section>\n\t\t\t\n\n\n<section class=\"wp-block-bgs-blocks-content-container content-section\"><div class=\"container\"><div class=\"row\"><div class=\"col-12\">\n<p>The Llanfair Dyffryn Clwyd borehole measures groundwater levels in the Triassic-aged <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=KNSF\">Kinnerton Sandstone Formation<\/a> near Rhuthun (Ruthin) in the Vale of Clywd, north Wales.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.bgs.ac.uk\/about-bgs\/contact-us\/\">BGS Enquiries<\/a> can help you to access data from the National Groundwater Level Archive (NGLA) for this well.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hydrograph<\/h2>\n\n\n\n<figure class=\"img-central\">\n  <img decoding=\"async\" src=\"https:\/\/resources.bgs.ac.uk\/groundwater\/hydrographs\/bgsfigs\/LLANFAIR DC-allyears.webp\" loading=\"lazy\" class=\"img-fluid\" alt=\"\"> \n<figcaption>\n        Groundwater level timeseries over the full observational record for Llanfair Dyffryn Clwyd. National Groundwater Level Archive, \u00a9 UKRI \u2013 BGS\n    <\/figcaption>\n<\/figure>\n\n<figure class=\"img-central\">\n  <img decoding=\"async\" src=\"https:\/\/resources.bgs.ac.uk\/groundwater\/hydrographs\/bgsfigs\/LLANFAIR DC-recentyears.webp\" loading=\"lazy\" class=\"img-fluid\" alt=\"\"> \n<figcaption>\n        Groundwater level timeseries for the last 5 years of available data for  Llanfair Dyffryn Clwyd. National Groundwater Level Archive, \u00a9 UKRI \u2013 BGS\n    <\/figcaption>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Information about the well<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Hydrogeological setting<\/h3>\n\n\n\t\t\t<div id=\"wysiwyg-2207-block_429696c7163a5de0bc3b2d543c68c7ed\" class=\"  \" >\n\t\t\t<div class=\"col-12 responsive-table\"><table>\n<tbody>\n<tr>\n<th style=\"width: 99.6575%;height: 23px;background-color: #002e40\" colspan=\"2\"><span style=\"color: #ffffff\">Llanfair DC<\/span><\/th>\n<\/tr>\n<tr>\n<td><strong>Wellmaster ID<\/strong><\/td>\n<td>SJ15\/13<\/td>\n<\/tr>\n<tr>\n<td><strong>NGR<\/strong><\/td>\n<td>3137 3555<\/td>\n<\/tr>\n<tr>\n<td><strong>Datum<\/strong><\/td>\n<td>83.08\u00a0m AOD<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 99.6575%;height: 23px;background-color: #002e40\" colspan=\"2\"><span style=\"color: #ffffff\">Monitoring details<\/span><\/th>\n<\/tr>\n<tr>\n<td><strong>Type<\/strong><\/td>\n<td>Groundwater level<\/td>\n<\/tr>\n<tr>\n<td><strong>Aquifer<\/strong><\/td>\n<td>Permo\u2013Triassic sandstone<\/td>\n<\/tr>\n<tr>\n<td><strong>Confinement<\/strong><\/td>\n<td>Confined<\/td>\n<\/tr>\n<tr>\n<td><strong>Depth<\/strong><\/td>\n<td>121.9 m<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 99.6575%;height: 23px;background-color: #002e40\" colspan=\"2\"><span style=\"color: #ffffff\">Record<\/span><\/th>\n<\/tr>\n<tr>\n<td><strong>Monitored by<\/strong><\/td>\n<td>Natural Resources Wales<\/td>\n<\/tr>\n<tr>\n<td><strong>Records commence<\/strong><\/td>\n<td>1972<\/td>\n<\/tr>\n<tr>\n<td><strong>Records end<\/strong><\/td>\n<td>Active<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n\t\t\t<\/div>\n\t\t\t\n\n\n<p>The borehole is in the Vale of Clywd and representative of levels within the important Permo-Triassic Sandstone aquifer.<\/p>\n\n\n\n<p>The borehole is drilled into the Kinnerton Sandstone Formation and is overlain by till deposits. It is possible that the sandstones are in hydraulic continuity with Carboniferous limestone, which may contribute water to the aquifer.<\/p>\n\n\n\n<p>The observed water levels are within the till, rather than the sandstones, implying that the sandstone aquifer is confined.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Well or borehole construction<\/h3>\n\n\n\n<p>The well is 121.9&nbsp;m deep, lined to 18.59&nbsp;m, with a diameter of 248&nbsp;mm reducing to 146&nbsp;mm at depth. It was drilled as a purpose-built observation well, with a secondary aim of establishing the geological succession.<\/p>\n\n\n\n<p>The driller&#8217;s log identifies a very porous zone between 98.8 and 100.6&nbsp;m below ground level.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hydrograph response<\/h3>\n\n\n<figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/llanfair-geology.webp\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Map of Llanfair Dyffryn Clwyd showing geology and water level contours. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_95581\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/llanfair-geology-150x150.webp\" class=\"lazy-blur\" alt=\"Map of Llanfair DC showing geology and water level contours. BGS \u00a9 UKRI.\" data-src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/llanfair-geology-260x300.webp\" \/><\/a><figcaption class=\"caption sm-line\">\n\t\t\t\t\t<div class=\"caption-icon\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/info-caption.svg\" alt=\"Information icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"caption-text\"><p>Map of Llanfair Dyffryn Clwyd showing geology and water level contours. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t<div class=\"expand-box expand-box-top\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/llanfair-geology.webp\" ><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/themes\/bgs\/img\/expand.svg\" alt=\"Expand icon\"><\/a><\/div>\n\t\t\t\t<\/figcaption><\/figure>\n\n\n<p>The hydrograph shows a spiky annual sinusoidal pattern, within a relatively restricted range, with fluctuations generally less than 1&nbsp;m per annum.<\/p>\n\n\n\n<p>Long-term trends are apparent in the data, with a slow rise through the 1970s, generally falling levels from 1985 to the mid 1990s and a relatively marked increase in levels to a record high in 2002. Since 2002, levels have fallen back slightly and appear to be relatively stable. It is assumed that these fluctuations reflect long-term changes in catchment water balance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Data issues<\/h3>\n\n\n\n<p>Considered to be good, reliable data.<\/p>\n\n\n\n<p>The borehole was previously numbered SJ15\/15.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Acknowledgements<\/h2>\n\n\n\n<p>Groundwater level data are provided to the NGLA by the Environment Agency (EA), Natural Resources Wales &#8211; Cyfoeth Naturiol Cymru (NRW), the Scottish Environment Protection Agency (SEPA) and, for Northern Ireland, the Department for Infrastructure &#8211; Rivers and the Northern Ireland Environment Agency.<\/p>\n\n\n\n<p>Further information about these monitoring networks can be found on these pages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/timeseriesdoc.sepa.org.uk\/\" target=\"_blank\" rel=\"noreferrer noopener\">Scotland<\/a>&nbsp;(SEPA)<\/li>\n\n\n\n<li><a href=\"https:\/\/environment.data.gov.uk\/hydrology\/landing\" target=\"_blank\" rel=\"noreferrer noopener\">England<\/a>&nbsp;(Defra)&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Contact<\/h2>\n\n\n\n<p>Please&nbsp;<a href=\"https:\/\/www.bgs.ac.uk\/about-bgs\/contact-us\/\">contact BGS Enquiries<\/a>&nbsp;for further information.<\/p>\n<\/div><\/div><\/div><\/section>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":3,"featured_media":0,"parent":30,"menu_order":7,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"1","_relevanssi_noindex_reason":"","footnotes":""},"tags":[],"class_list":["post-153","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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