{"id":169,"date":"2023-11-23T12:33:01","date_gmt":"2023-11-23T12:33:01","guid":{"rendered":"https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/stonor-park\/"},"modified":"2025-12-17T13:43:44","modified_gmt":"2025-12-17T13:43:44","slug":"stonor-park","status":"publish","type":"page","link":"https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/stonor-park\/","title":{"rendered":"Stonor Park"},"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>Stonor Park<\/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\/stonor-park\/\"><span class=\"icon-facebook\"><span class=\"hidden\">Facebook<\/span><\/span><\/a><a target=\"_blank\"  href=\"https:\/\/twitter.com\/intent\/tweet?text=Stonor%20Park&#038;url=https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/stonor-park\/\"><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\/stonor-park\/\"><span class=\"icon-whatsapp\"><span class=\"hidden\">WhatsApp<\/span><\/span><\/a><a   href=\"mailto:?subject=Stonor%20Park&#038;body=%20(https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/stonor-park\/)\"><span class=\"icon-mail\"><span class=\"hidden\">Email<\/span><\/span><\/a><a href=\"#\" data-copy=\"https:\/\/www.bgs.ac.uk\/groundwater\/data\/groundwater-levels\/stonor-park\/\" 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 Stonor Park well, measuring levels in the <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=SBS\">Chalk Group<\/a> aquifer near Henley-on-Thames in south-east England. Its hydrogeological setting and the absence of major abstractions in its vicinity mean it is often cited as a &#8216;typical&#8217; chalk observation well.<\/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<figure  class=\"img-wrap\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/StonorPark-RedSpot-150x150.jpg\" class=\"lazy-blur\" alt=\"Location of Stonor Park. BGS \u00a9 UKRI.\" data-src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/StonorPark-RedSpot.jpg\" \/><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>Location of Stonor Park. BGS \u00a9 UKRI.<\/p>\n<\/div>\n\t\t\t\t\t\n\t\t\t\t<\/figcaption><\/figure>\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\/STONOR PARK-allyears.webp\" loading=\"lazy\" class=\"img-fluid\" alt=\"\"> \n<figcaption>\n        Groundwater level timeseries over the full observational record for Stonor Park. 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\/STONOR PARK-recentyears.webp\" loading=\"lazy\" class=\"img-fluid\" alt=\"\"> \n<figcaption>\n        Groundwater level timeseries for the last 5 years of available data for  Stonor Park. 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-6599-block_16be328ae5a8502e122ab82ec4afe59b\" 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\">Stonor Park<\/span><\/th>\n<\/tr>\n<tr>\n<td><strong>Wellmaster ID<\/strong><\/td>\n<td>SU78\/45A<\/td>\n<\/tr>\n<tr>\n<td><strong>NGR<\/strong><\/td>\n<td>4741 1892<\/td>\n<\/tr>\n<tr>\n<td><strong>Datum<\/strong><\/td>\n<td>121.29\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>Chalk<\/td>\n<\/tr>\n<tr>\n<td><strong>Confinement<\/strong><\/td>\n<td>Unconfined<\/td>\n<\/tr>\n<tr>\n<td><strong>Depth<\/strong><\/td>\n<td>87.5 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>EA Thames<\/td>\n<\/tr>\n<tr>\n<td><strong>Records commence<\/strong><\/td>\n<td>1961<\/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 monitors water level in the Chalk Group in the Berkshire Downs above Henley-on-Thames. It is drilled into the <a href=\"https:\/\/webapps.bgs.ac.uk\/lexicon\/lexicon.cfm?pub=LECH\">Lewes Nodular Chalk Formation<\/a>. The aquifer is unconfined.<\/p>\n\n\n<figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/stonor-park-large-geology.webp\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Geological map of the area around Stonor Park. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_998\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/stonor-park-large-geology-150x150.webp\" class=\"lazy-blur\" alt=\"Geological map of the area around Stonor Park. BGS \u00a9 UKRI.\" data-src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/stonor-park-large-geology-300x243.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>Geological map of the area around Stonor Park. 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\/stonor-park-large-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<h3 class=\"wp-block-heading\">Well or borehole construction<\/h3>\n\n\n\n<p>The well consists of a 2.2&nbsp;m-diameter shaft to 60&nbsp;m and a 152&nbsp;mm-diameter borehole to 87.5&nbsp;m.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hydrograph response<\/h3>\n\n\n\n<p>This hydrograph has a very regular annual sinusoidal pattern, capturing the aquifer&#8217;s full range of fluctuation, although analysis suggests that there may be a constraint on low levels. As levels don&#8217;t reach the bottom of the well, the constraint may be hydrogeological.<\/p>\n\n\n<figure  class=\"img-wrap\"><a href=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/hillshade-map-stonor-park.webp\" data-toggle=\"lightbox\" data-footer=\"&lt;p&gt;Topographical map with hillshade of the area around Stonor Park. BGS \u00a9 UKRI.&lt;\/p&gt;\n\" data-gallery=\"gallery_21981\"><img decoding=\"async\" src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/hillshade-map-stonor-park-150x150.webp\" class=\"lazy-blur\" alt=\"Topographic map with hillshade of the area around Stonor Park. BGS \u00a9 UKRI.\" data-src=\"https:\/\/www.bgs.ac.uk\/groundwater\/wp-content\/uploads\/sites\/4\/2023\/12\/hillshade-map-stonor-park-300x201.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>Topographical map with hillshade of the area around Stonor Park. 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\/hillshade-map-stonor-park.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 relative simplicity of the borehole&#8217;s response to recharge has meant that it is frequently cited as a typical chalk well and used in modelling exercises to link precipitation, recharge and water level. The chalk block monitored by Stonor is, in fact, slightly atypical in that it is one of the larger blocks without surface drainage and responses to individual recharge events are dampened.<\/p>\n\n\n\n<p>Flow in the Assendon spring is initiated when water levels reach 85.5&nbsp;m AOD, which tends to occur around once per decade.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Data issues<\/h3>\n\n\n\n<p>Uninterrupted weekly data from 1963.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">References<\/h3>\n\n\n\n<p>Finch, J, Marsh, T, and McKenzie, A A. 2007.&nbsp;<a href=\"http:\/\/nora.nerc.ac.uk\/1387\/\" target=\"_blank\" rel=\"noreferrer noopener\">A preliminary risk assessment of the potential for groundwater flooding during the winter of 2007\/8 \u2014 an update<\/a>. (Wallingford, UK: NERC\/Centre for Ecology and Hydrology-British Geological Survey.)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"acknowledgements\">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","protected":false},"excerpt":{"rendered":"","protected":false},"author":3,"featured_media":0,"parent":30,"menu_order":15,"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-169","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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