{"id":153,"date":"2023-11-23T12:33:01","date_gmt":"2023-11-23T12:33:01","guid":{"rendered":"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//data/groundwater/wp-json/wp/v2/pages/153//groundwater-levels/groundwater/wp-json/wp/v2/pages/153//llanfair-dyffryn-clwyd/groundwater/wp-json/wp/v2/pages/153//"},"modified":"2025-12-17T13:42:10","modified_gmt":"2025-12-17T13:42:10","slug":"llanfair-dyffryn-clwyd","status":"publish","type":"page","link":"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//data/groundwater/wp-json/wp/v2/pages/153//groundwater-levels/groundwater/wp-json/wp/v2/pages/153//llanfair-dyffryn-clwyd/groundwater/wp-json/wp/v2/pages/153//","title":{"rendered":"Llanfair Dyffryn Clwyd"},"content":{"rendered":"/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<section class=/groundwater/wp-json/wp/v2/pages/153/"hero-section hero-section-with-social/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"hero-info-wrap/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"container/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"row/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"col-12/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"hero-info/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<h1>Llanfair Dyffryn Clwyd</groundwater/wp-json/wp/v2/pages/153//h1>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t</groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t</groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t</groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t</groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t</groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"social-wrap social-wrap-inline-them/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"sea-background-f/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<span>Share this article</groundwater/wp-json/wp/v2/pages/153//span><a target=/groundwater/wp-json/wp/v2/pages/153/"_blank/groundwater/wp-json/wp/v2/pages/153/"  href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.facebook.com/groundwater/wp-json/wp/v2/pages/153//sharer/groundwater/wp-json/wp/v2/pages/153//sharer.php?u=https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//data/groundwater/wp-json/wp/v2/pages/153//groundwater-levels/groundwater/wp-json/wp/v2/pages/153//llanfair-dyffryn-clwyd/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"icon-facebook/groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"hidden/groundwater/wp-json/wp/v2/pages/153/">Facebook</groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//a><a target=/groundwater/wp-json/wp/v2/pages/153/"_blank/groundwater/wp-json/wp/v2/pages/153/"  href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//twitter.com/groundwater/wp-json/wp/v2/pages/153//intent/groundwater/wp-json/wp/v2/pages/153//tweet?text=Llanfair%20Dyffryn%20Clwyd&#038;url=https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//data/groundwater/wp-json/wp/v2/pages/153//groundwater-levels/groundwater/wp-json/wp/v2/pages/153//llanfair-dyffryn-clwyd/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"icon-twitter/groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"hidden/groundwater/wp-json/wp/v2/pages/153/">Twitter</groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//a><a   onclick=/groundwater/wp-json/wp/v2/pages/153/"javascript:void( (function() {var e=document.createElement('script' );e.setAttribute('type','text/groundwater/wp-json/wp/v2/pages/153//javascript' );e.setAttribute('charset','UTF-8' );e.setAttribute('src','/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//assets.pinterest.com/groundwater/wp-json/wp/v2/pages/153//js/groundwater/wp-json/wp/v2/pages/153//pinmarklet.js?r='+Math.random()*99999999);document.body.appendChild(e)})());/groundwater/wp-json/wp/v2/pages/153/"  href=/groundwater/wp-json/wp/v2/pages/153/"javascript:void(0);/groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"icon-pinterest/groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"hidden/groundwater/wp-json/wp/v2/pages/153/">Pinterest</groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//a><a target=/groundwater/wp-json/wp/v2/pages/153/"_blank/groundwater/wp-json/wp/v2/pages/153/"  href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//wa.me?text=https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//data/groundwater/wp-json/wp/v2/pages/153//groundwater-levels/groundwater/wp-json/wp/v2/pages/153//llanfair-dyffryn-clwyd/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"icon-whatsapp/groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"hidden/groundwater/wp-json/wp/v2/pages/153/">WhatsApp</groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//a><a   href=/groundwater/wp-json/wp/v2/pages/153/"mailto:?subject=Llanfair%20Dyffryn%20Clwyd&#038;body=%20(https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//data/groundwater/wp-json/wp/v2/pages/153//groundwater-levels/groundwater/wp-json/wp/v2/pages/153//llanfair-dyffryn-clwyd/groundwater/wp-json/wp/v2/pages/153//)/groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"icon-mail/groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"hidden/groundwater/wp-json/wp/v2/pages/153/">Email</groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//a><a href=/groundwater/wp-json/wp/v2/pages/153/"#/groundwater/wp-json/wp/v2/pages/153/" data-copy=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//data/groundwater/wp-json/wp/v2/pages/153//groundwater-levels/groundwater/wp-json/wp/v2/pages/153//llanfair-dyffryn-clwyd/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153/" class=/groundwater/wp-json/wp/v2/pages/153/"copy-url-on-click/groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"icon-link/groundwater/wp-json/wp/v2/pages/153/"><span class=/groundwater/wp-json/wp/v2/pages/153/"hidden/groundwater/wp-json/wp/v2/pages/153/">Copy Link</groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//a></groundwater/wp-json/wp/v2/pages/153//div></groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t</groundwater/wp-json/wp/v2/pages/153//section>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<section class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-bgs-blocks-content-container content-section/groundwater/wp-json/wp/v2/pages/153/"><div class=/groundwater/wp-json/wp/v2/pages/153/"container/groundwater/wp-json/wp/v2/pages/153/"><div class=/groundwater/wp-json/wp/v2/pages/153/"row/groundwater/wp-json/wp/v2/pages/153/"><div class=/groundwater/wp-json/wp/v2/pages/153/"col-12/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">The Llanfair Dyffryn Clwyd borehole measures groundwater levels in the Triassic-aged <a href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//webapps.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//lexicon/groundwater/wp-json/wp/v2/pages/153//lexicon.cfm?pub=KNSF/groundwater/wp-json/wp/v2/pages/153/">Kinnerton Sandstone Formation</groundwater/wp-json/wp/v2/pages/153//a> near Rhuthun (Ruthin) in the Vale of Clywd, north Wales.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/"><a href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//about-bgs/groundwater/wp-json/wp/v2/pages/153//contact-us/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153/">BGS Enquiries</groundwater/wp-json/wp/v2/pages/153//a> can help you to access data from the National Groundwater Level Archive (NGLA) for this well.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<h2 class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-heading/groundwater/wp-json/wp/v2/pages/153/">Hydrograph</groundwater/wp-json/wp/v2/pages/153//h2>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<figure class=/groundwater/wp-json/wp/v2/pages/153/"img-central/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n  <img decoding=/groundwater/wp-json/wp/v2/pages/153/"async/groundwater/wp-json/wp/v2/pages/153/" src=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//resources.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//hydrographs/groundwater/wp-json/wp/v2/pages/153//bgsfigs/groundwater/wp-json/wp/v2/pages/153//LLANFAIR DC-allyears.webp/groundwater/wp-json/wp/v2/pages/153/" loading=/groundwater/wp-json/wp/v2/pages/153/"lazy/groundwater/wp-json/wp/v2/pages/153/" class=/groundwater/wp-json/wp/v2/pages/153/"img-fluid/groundwater/wp-json/wp/v2/pages/153/" alt=/groundwater/wp-json/wp/v2/pages/153/"/groundwater/wp-json/wp/v2/pages/153/"> /groundwater/wp-json/wp/v2/pages/153/n<figcaption>/groundwater/wp-json/wp/v2/pages/153/n        Groundwater level timeseries over the full observational record for Llanfair Dyffryn Clwyd. National Groundwater Level Archive, /groundwater/wp-json/wp/v2/pages/153/u00a9 UKRI /groundwater/wp-json/wp/v2/pages/153/u2013 BGS/groundwater/wp-json/wp/v2/pages/153/n    </groundwater/wp-json/wp/v2/pages/153//figcaption>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//figure>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<figure class=/groundwater/wp-json/wp/v2/pages/153/"img-central/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n  <img decoding=/groundwater/wp-json/wp/v2/pages/153/"async/groundwater/wp-json/wp/v2/pages/153/" src=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//resources.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//hydrographs/groundwater/wp-json/wp/v2/pages/153//bgsfigs/groundwater/wp-json/wp/v2/pages/153//LLANFAIR DC-recentyears.webp/groundwater/wp-json/wp/v2/pages/153/" loading=/groundwater/wp-json/wp/v2/pages/153/"lazy/groundwater/wp-json/wp/v2/pages/153/" class=/groundwater/wp-json/wp/v2/pages/153/"img-fluid/groundwater/wp-json/wp/v2/pages/153/" alt=/groundwater/wp-json/wp/v2/pages/153/"/groundwater/wp-json/wp/v2/pages/153/"> /groundwater/wp-json/wp/v2/pages/153/n<figcaption>/groundwater/wp-json/wp/v2/pages/153/n        Groundwater level timeseries for the last 5 years of available data for  Llanfair Dyffryn Clwyd. National Groundwater Level Archive, /groundwater/wp-json/wp/v2/pages/153/u00a9 UKRI /groundwater/wp-json/wp/v2/pages/153/u2013 BGS/groundwater/wp-json/wp/v2/pages/153/n    </groundwater/wp-json/wp/v2/pages/153//figcaption>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//figure>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<h2 class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-heading/groundwater/wp-json/wp/v2/pages/153/">Information about the well</groundwater/wp-json/wp/v2/pages/153//h2>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<h3 class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-heading/groundwater/wp-json/wp/v2/pages/153/">Hydrogeological setting</groundwater/wp-json/wp/v2/pages/153//h3>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div id=/groundwater/wp-json/wp/v2/pages/153/"wysiwyg-8988-block_429696c7163a5de0bc3b2d543c68c7ed/groundwater/wp-json/wp/v2/pages/153/" class=/groundwater/wp-json/wp/v2/pages/153/"  /groundwater/wp-json/wp/v2/pages/153/" >/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"col-12 responsive-table/groundwater/wp-json/wp/v2/pages/153/"><table>/groundwater/wp-json/wp/v2/pages/153/n<tbody>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<th style=/groundwater/wp-json/wp/v2/pages/153/"width: 99.6575%;height: 23px;background-color: #002e40/groundwater/wp-json/wp/v2/pages/153/" colspan=/groundwater/wp-json/wp/v2/pages/153/"2/groundwater/wp-json/wp/v2/pages/153/"><span style=/groundwater/wp-json/wp/v2/pages/153/"color: #ffffff/groundwater/wp-json/wp/v2/pages/153/">Llanfair DC</groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//th>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<td><strong>Wellmaster ID</groundwater/wp-json/wp/v2/pages/153//strong></groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n<td>SJ15/groundwater/wp-json/wp/v2/pages/153//13</groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<td><strong>NGR</groundwater/wp-json/wp/v2/pages/153//strong></groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n<td>3137 3555</groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<td><strong>Datum</groundwater/wp-json/wp/v2/pages/153//strong></groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n<td>83.08/groundwater/wp-json/wp/v2/pages/153/u00a0m AOD</groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<th style=/groundwater/wp-json/wp/v2/pages/153/"width: 99.6575%;height: 23px;background-color: #002e40/groundwater/wp-json/wp/v2/pages/153/" colspan=/groundwater/wp-json/wp/v2/pages/153/"2/groundwater/wp-json/wp/v2/pages/153/"><span style=/groundwater/wp-json/wp/v2/pages/153/"color: #ffffff/groundwater/wp-json/wp/v2/pages/153/">Monitoring details</groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//th>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<td><strong>Type</groundwater/wp-json/wp/v2/pages/153//strong></groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n<td>Groundwater level</groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<td><strong>Aquifer</groundwater/wp-json/wp/v2/pages/153//strong></groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n<td>Permo/groundwater/wp-json/wp/v2/pages/153/u2013Triassic sandstone</groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<td><strong>Confinement</groundwater/wp-json/wp/v2/pages/153//strong></groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n<td>Confined</groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<td><strong>Depth</groundwater/wp-json/wp/v2/pages/153//strong></groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n<td>121.9 m</groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<th style=/groundwater/wp-json/wp/v2/pages/153/"width: 99.6575%;height: 23px;background-color: #002e40/groundwater/wp-json/wp/v2/pages/153/" colspan=/groundwater/wp-json/wp/v2/pages/153/"2/groundwater/wp-json/wp/v2/pages/153/"><span style=/groundwater/wp-json/wp/v2/pages/153/"color: #ffffff/groundwater/wp-json/wp/v2/pages/153/">Record</groundwater/wp-json/wp/v2/pages/153//span></groundwater/wp-json/wp/v2/pages/153//th>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<td><strong>Monitored by</groundwater/wp-json/wp/v2/pages/153//strong></groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n<td>Natural Resources Wales</groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<td><strong>Records commence</groundwater/wp-json/wp/v2/pages/153//strong></groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n<td>1972</groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n<tr>/groundwater/wp-json/wp/v2/pages/153/n<td><strong>Records end</groundwater/wp-json/wp/v2/pages/153//strong></groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n<td>Active</groundwater/wp-json/wp/v2/pages/153//td>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tr>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//tbody>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//table></groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t</groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">The borehole is in the Vale of Clywd and representative of levels within the important Permo-Triassic Sandstone aquifer.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">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.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">The observed water levels are within the till, rather than the sandstones, implying that the sandstone aquifer is confined.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<h3 class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-heading/groundwater/wp-json/wp/v2/pages/153/">Well or borehole construction</groundwater/wp-json/wp/v2/pages/153//h3>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">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.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">The driller&#8217;s log identifies a very porous zone between 98.8 and 100.6&nbsp;m below ground level.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<h3 class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-heading/groundwater/wp-json/wp/v2/pages/153/">Hydrograph response</groundwater/wp-json/wp/v2/pages/153//h3>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<figure  class=/groundwater/wp-json/wp/v2/pages/153/"img-wrap/groundwater/wp-json/wp/v2/pages/153/"><a href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//wp-content/groundwater/wp-json/wp/v2/pages/153//uploads/groundwater/wp-json/wp/v2/pages/153//sites/groundwater/wp-json/wp/v2/pages/153//4/groundwater/wp-json/wp/v2/pages/153//2023/groundwater/wp-json/wp/v2/pages/153//12/groundwater/wp-json/wp/v2/pages/153//llanfair-geology.webp/groundwater/wp-json/wp/v2/pages/153/" data-toggle=/groundwater/wp-json/wp/v2/pages/153/"lightbox/groundwater/wp-json/wp/v2/pages/153/" data-footer=/groundwater/wp-json/wp/v2/pages/153/"&lt;p&gt;Map of Llanfair Dyffryn Clwyd showing geology and water level contours. BGS /groundwater/wp-json/wp/v2/pages/153/u00a9 UKRI.&lt;/groundwater/wp-json/wp/v2/pages/153//p&gt;/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/" data-gallery=/groundwater/wp-json/wp/v2/pages/153/"gallery_6374/groundwater/wp-json/wp/v2/pages/153/"><img decoding=/groundwater/wp-json/wp/v2/pages/153/"async/groundwater/wp-json/wp/v2/pages/153/" src=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//wp-content/groundwater/wp-json/wp/v2/pages/153//uploads/groundwater/wp-json/wp/v2/pages/153//sites/groundwater/wp-json/wp/v2/pages/153//4/groundwater/wp-json/wp/v2/pages/153//2023/groundwater/wp-json/wp/v2/pages/153//12/groundwater/wp-json/wp/v2/pages/153//llanfair-geology-150x150.webp/groundwater/wp-json/wp/v2/pages/153/" class=/groundwater/wp-json/wp/v2/pages/153/"lazy-blur/groundwater/wp-json/wp/v2/pages/153/" alt=/groundwater/wp-json/wp/v2/pages/153/"Map of Llanfair DC showing geology and water level contours. BGS /groundwater/wp-json/wp/v2/pages/153/u00a9 UKRI./groundwater/wp-json/wp/v2/pages/153/" data-src=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//wp-content/groundwater/wp-json/wp/v2/pages/153//uploads/groundwater/wp-json/wp/v2/pages/153//sites/groundwater/wp-json/wp/v2/pages/153//4/groundwater/wp-json/wp/v2/pages/153//2023/groundwater/wp-json/wp/v2/pages/153//12/groundwater/wp-json/wp/v2/pages/153//llanfair-geology-260x300.webp/groundwater/wp-json/wp/v2/pages/153/" /groundwater/wp-json/wp/v2/pages/153//></groundwater/wp-json/wp/v2/pages/153//a><figcaption class=/groundwater/wp-json/wp/v2/pages/153/"caption sm-line/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"caption-icon/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<img decoding=/groundwater/wp-json/wp/v2/pages/153/"async/groundwater/wp-json/wp/v2/pages/153/" src=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//wp-content/groundwater/wp-json/wp/v2/pages/153//themes/groundwater/wp-json/wp/v2/pages/153//bgs/groundwater/wp-json/wp/v2/pages/153//img/groundwater/wp-json/wp/v2/pages/153//info-caption.svg/groundwater/wp-json/wp/v2/pages/153/" alt=/groundwater/wp-json/wp/v2/pages/153/"Information icon/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t</groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"caption-text/groundwater/wp-json/wp/v2/pages/153/"><p>Map of Llanfair Dyffryn Clwyd showing geology and water level contours. BGS /groundwater/wp-json/wp/v2/pages/153/u00a9 UKRI.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t<div class=/groundwater/wp-json/wp/v2/pages/153/"expand-box expand-box-top/groundwater/wp-json/wp/v2/pages/153/"><a href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//wp-content/groundwater/wp-json/wp/v2/pages/153//uploads/groundwater/wp-json/wp/v2/pages/153//sites/groundwater/wp-json/wp/v2/pages/153//4/groundwater/wp-json/wp/v2/pages/153//2023/groundwater/wp-json/wp/v2/pages/153//12/groundwater/wp-json/wp/v2/pages/153//llanfair-geology.webp/groundwater/wp-json/wp/v2/pages/153/" ><img decoding=/groundwater/wp-json/wp/v2/pages/153/"async/groundwater/wp-json/wp/v2/pages/153/" src=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//wp-content/groundwater/wp-json/wp/v2/pages/153//themes/groundwater/wp-json/wp/v2/pages/153//bgs/groundwater/wp-json/wp/v2/pages/153//img/groundwater/wp-json/wp/v2/pages/153//expand.svg/groundwater/wp-json/wp/v2/pages/153/" alt=/groundwater/wp-json/wp/v2/pages/153/"Expand icon/groundwater/wp-json/wp/v2/pages/153/"></groundwater/wp-json/wp/v2/pages/153//a></groundwater/wp-json/wp/v2/pages/153//div>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t/groundwater/wp-json/wp/v2/pages/153/t</groundwater/wp-json/wp/v2/pages/153//figcaption></groundwater/wp-json/wp/v2/pages/153//figure>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">The hydrograph shows a spiky annual sinusoidal pattern, within a relatively restricted range, with fluctuations generally less than 1&nbsp;m per annum.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">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.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<h3 class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-heading/groundwater/wp-json/wp/v2/pages/153/">Data issues</groundwater/wp-json/wp/v2/pages/153//h3>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">Considered to be good, reliable data.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">The borehole was previously numbered SJ15/groundwater/wp-json/wp/v2/pages/153//15.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<h2 class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-heading/groundwater/wp-json/wp/v2/pages/153/">Acknowledgements</groundwater/wp-json/wp/v2/pages/153//h2>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">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.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">Further information about these monitoring networks can be found on these pages:</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<ul class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-list/groundwater/wp-json/wp/v2/pages/153/">/groundwater/wp-json/wp/v2/pages/153/n<li><a href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//timeseriesdoc.sepa.org.uk/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153/" target=/groundwater/wp-json/wp/v2/pages/153/"_blank/groundwater/wp-json/wp/v2/pages/153/" rel=/groundwater/wp-json/wp/v2/pages/153/"noreferrer noopener/groundwater/wp-json/wp/v2/pages/153/">Scotland</groundwater/wp-json/wp/v2/pages/153//a>&nbsp;(SEPA)</groundwater/wp-json/wp/v2/pages/153//li>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<li><a href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//environment.data.gov.uk/groundwater/wp-json/wp/v2/pages/153//hydrology/groundwater/wp-json/wp/v2/pages/153//landing/groundwater/wp-json/wp/v2/pages/153/" target=/groundwater/wp-json/wp/v2/pages/153/"_blank/groundwater/wp-json/wp/v2/pages/153/" rel=/groundwater/wp-json/wp/v2/pages/153/"noreferrer noopener/groundwater/wp-json/wp/v2/pages/153/">England</groundwater/wp-json/wp/v2/pages/153//a>&nbsp;(Defra)&nbsp;</groundwater/wp-json/wp/v2/pages/153//li>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//ul>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<h2 class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-heading/groundwater/wp-json/wp/v2/pages/153/">Contact</groundwater/wp-json/wp/v2/pages/153//h2>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/">Please&nbsp;<a href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//about-bgs/groundwater/wp-json/wp/v2/pages/153//contact-us/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153/">contact BGS Enquiries</groundwater/wp-json/wp/v2/pages/153//a>&nbsp;for further information.</groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/n</groundwater/wp-json/wp/v2/pages/153//div></groundwater/wp-json/wp/v2/pages/153//div></groundwater/wp-json/wp/v2/pages/153//div></groundwater/wp-json/wp/v2/pages/153//section>/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n/groundwater/wp-json/wp/v2/pages/153/n<p class=/groundwater/wp-json/wp/v2/pages/153/"wp-block-paragraph/groundwater/wp-json/wp/v2/pages/153/"></groundwater/wp-json/wp/v2/pages/153//p>/groundwater/wp-json/wp/v2/pages/153/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 v27.9 - https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//yoast.com/groundwater/wp-json/wp/v2/pages/153//product/groundwater/wp-json/wp/v2/pages/153//yoast-seo-wordpress/groundwater/wp-json/wp/v2/pages/153// -->/groundwater/wp-json/wp/v2/pages/153/n<title>Llanfair Dyffryn Clwyd - BGS Groundwater</groundwater/wp-json/wp/v2/pages/153//title>/groundwater/wp-json/wp/v2/pages/153/n<meta name=/groundwater/wp-json/wp/v2/pages/153/"description/groundwater/wp-json/wp/v2/pages/153/" content=/groundwater/wp-json/wp/v2/pages/153/"The Llanfair DC borehole measures groundwater levels in Permo-Triassic Sandstones in the Vale of Clywd in Wales./groundwater/wp-json/wp/v2/pages/153/" /groundwater/wp-json/wp/v2/pages/153//>/groundwater/wp-json/wp/v2/pages/153/n<meta name=/groundwater/wp-json/wp/v2/pages/153/"robots/groundwater/wp-json/wp/v2/pages/153/" content=/groundwater/wp-json/wp/v2/pages/153/"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1/groundwater/wp-json/wp/v2/pages/153/" /groundwater/wp-json/wp/v2/pages/153//>/groundwater/wp-json/wp/v2/pages/153/n<link rel=/groundwater/wp-json/wp/v2/pages/153/"canonical/groundwater/wp-json/wp/v2/pages/153/" href=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//data/groundwater/wp-json/wp/v2/pages/153//groundwater-levels/groundwater/wp-json/wp/v2/pages/153//llanfair-dyffryn-clwyd/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153/" /groundwater/wp-json/wp/v2/pages/153//>/groundwater/wp-json/wp/v2/pages/153/n<meta property=/groundwater/wp-json/wp/v2/pages/153/"og:locale/groundwater/wp-json/wp/v2/pages/153/" content=/groundwater/wp-json/wp/v2/pages/153/"en_GB/groundwater/wp-json/wp/v2/pages/153/" /groundwater/wp-json/wp/v2/pages/153//>/groundwater/wp-json/wp/v2/pages/153/n<meta property=/groundwater/wp-json/wp/v2/pages/153/"og:type/groundwater/wp-json/wp/v2/pages/153/" content=/groundwater/wp-json/wp/v2/pages/153/"article/groundwater/wp-json/wp/v2/pages/153/" /groundwater/wp-json/wp/v2/pages/153//>/groundwater/wp-json/wp/v2/pages/153/n<meta property=/groundwater/wp-json/wp/v2/pages/153/"og:title/groundwater/wp-json/wp/v2/pages/153/" content=/groundwater/wp-json/wp/v2/pages/153/"Llanfair Dyffryn Clwyd - BGS Groundwater/groundwater/wp-json/wp/v2/pages/153/" /groundwater/wp-json/wp/v2/pages/153//>/groundwater/wp-json/wp/v2/pages/153/n<meta property=/groundwater/wp-json/wp/v2/pages/153/"og:description/groundwater/wp-json/wp/v2/pages/153/" content=/groundwater/wp-json/wp/v2/pages/153/"The Llanfair DC borehole measures groundwater levels in Permo-Triassic Sandstones in the Vale of Clywd in Wales./groundwater/wp-json/wp/v2/pages/153/" /groundwater/wp-json/wp/v2/pages/153//>/groundwater/wp-json/wp/v2/pages/153/n<meta property=/groundwater/wp-json/wp/v2/pages/153/"og:url/groundwater/wp-json/wp/v2/pages/153/" content=/groundwater/wp-json/wp/v2/pages/153/"https:/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153//www.bgs.ac.uk/groundwater/wp-json/wp/v2/pages/153//groundwater/groundwater/wp-json/wp/v2/pages/153//data/groundwater/wp-json/wp/v2/pages/153//groundwater-levels/groundwater/wp-json/wp/v2/pages/153//llanfair-dyffryn-clwyd/groundwater/wp-json/wp/v2/pages/153///groundwater/wp-json/wp/v2/pages/153/" /groundwater/wp-json/wp/v2/pages/153//>/groundwater/wp-json/wp/v2/pages/153/n<meta property=/groundwater/wp-json/wp/v2/pages/153/"og:site_name/groundwater/wp-json/wp/v2/pages/153/" content=/groundwater/wp-json/wp/v2/pages/153/"BGS Groundwater/groundwater/wp-json/wp/v2/pages/153/" /groundwater/wp-json/wp/v2/pages/153//>/groundwater/wp-json/wp/v2/pages/153/n<meta 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