{"id":8022,"date":"2021-06-29T16:39:00","date_gmt":"2021-06-29T14:39:00","guid":{"rendered":"https:\/\/www.idro-elettrica.it\/esperto-risponde\/tank-installation-in-the-presence-of-an-aquifer-a-guide\/"},"modified":"2026-07-01T09:46:44","modified_gmt":"2026-07-01T07:46:44","slug":"tank-installation-in-the-presence-of-an-aquifer-a-guide","status":"publish","type":"esperto-risponde","link":"https:\/\/www.idro-elettrica.it\/en\/esperto-risponde\/tank-installation-in-the-presence-of-an-aquifer-a-guide\/","title":{"rendered":"Tank Installation in the Presence of an Aquifer: A Guide"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em>Installing a tank in presence of an aquifer<\/em> means, first and foremost, properly managing the water table level and hydrostatic pressure.  <\/p>\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li class=\"\"><a href=\"#verifiche-preliminari-sul-livello-di-falda\">Preliminary Assessments of the Water Table Level<\/a><\/li><li class=\"\"><a href=\"#drenaggio-prima-dello-scavo-perche-serve\">Drainage Before Excavation: Why It&#8217;s Necessary<\/a><\/li><li class=\"\"><a href=\"#scavo-e-stabilita-modalita-e-scarpate\">Excavation and Stability: Methods and Slopes<\/a><\/li><li class=\"\"><a href=\"#fase-1-platea-di-fondazione-e-ancoraggio-del-serbatoio-spinta-idrostatica\">Phase 1: Foundation slab and tank anchoring (hydrostatic thrust)<\/a><\/li><li class=\"\"><a href=\"#fasi-2-3-posa-reinterro-e-riempimenti-controllati\">Phases 2\u20133: Installation, Backfilling, and Controlled Filling<\/a><ul><li class=\"\"><a href=\"#fase-2-riempimenti-e-riempimento-serbatoio\">Step 2: Filling and Tank Filling<\/a><\/li><li class=\"\"><a href=\"#fase-3-completamenti-prolunghe-e-sigillature\">Step 3: Finishing Touches, Extensions, and Sealing<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#fase-4-chiusura-dellinterro-e-valutazione-dei-carichi-in-superficie\">Step 4: Backfilling and Assessment of Surface Loads<\/a><\/li><li class=\"\"><a href=\"#allacciamenti-idraulici-tubazioni-e-giunti-flessibili-per-ridurre-il-rischio\">Hydraulic Connections: Pipes and Flexible Fittings to Reduce Risk<\/a><\/li><li class=\"\"><a href=\"#conclusione\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2 id=\"verifiche-preliminari-sul-livello-di-falda\" class=\"wp-block-heading\">Preliminary Assessments of the Water Table Level<\/h2>\n\n<p class=\"wp-block-paragraph\">Before designing the excavation, the first step is <strong>to<\/strong> determine <strong>the maximum water table level that can be reached at different times of the year<\/strong>. This step is necessary to <strong>identify the maximum hydrostatic pressure<\/strong> that may act on the tank and the foundation\/anchoring structures. <\/p>\n\n<p class=\"wp-block-paragraph\">In practice, the goal is to have a clear understanding of the most challenging scenario, so that subsequent decisions (drainage, excavation, foundation slab, tie rods) can be made correctly.<\/p>\n\n<h2 id=\"drenaggio-prima-dello-scavo-perche-serve\" class=\"wp-block-heading\">Drainage Before Excavation: Why It&#8217;s Necessary<\/h2>\n\n<p class=\"wp-block-paragraph\">Before proceeding with the excavation, it is necessary <strong>to install adequate drainage systems<\/strong> to <strong>lower the water table<\/strong>. This makes the excavation possible and creates the conditions for working in a more controlled manner. <\/p>\n\n<p class=\"wp-block-paragraph\">This phase is closely linked to the initial assessment: the more critical the aquifer is (in terms of water level and seasonal variability), the more crucial it becomes to plan for adequate drainage before beginning excavation.<\/p>\n\n<h2 id=\"scavo-e-stabilita-modalita-e-scarpate\" class=\"wp-block-heading\">Excavation and Stability: Methods and Slopes<\/h2>\n\n<p class=\"wp-block-paragraph\">When the water table is present, simply \u201cdigging\u201d is not enough: <strong>the excavation method<\/strong> and <strong>the slope angle<\/strong> must <strong>be evaluated<\/strong> to <strong>prevent landslides<\/strong>. The choice depends on the <strong>type of soil<\/strong> and the <strong>water table level<\/strong>. <\/p>\n\n<p class=\"wp-block-paragraph\">The key point here is stability: decisions regarding the excavation geometry and slopes must be consistent with the actual conditions encountered (soil and water), because they directly affect the safety and quality of the subsequent backfilling.<\/p>\n\n<h2 id=\"fase-1-platea-di-fondazione-e-ancoraggio-del-serbatoio-spinta-idrostatica\" class=\"wp-block-heading\">Phase 1: Foundation slab and tank anchoring (hydrostatic thrust)<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>Phase 1<\/strong> includes:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Carrying Out Excavation with a Specified Cross-Section<\/strong><\/li>\n\n\n\n<li><strong>Construction of the concrete foundation slab<\/strong><\/li>\n\n\n\n<li><strong>Securing the tank<\/strong> to the foundation using <strong>cables or tie rods<\/strong><\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">A key point: <strong>the dimensions of the foundation and tie rods<\/strong> <strong>must be calculated based on hydrostatic pressure<\/strong>. In other words, verifying the maximum groundwater level (first section) translates here into the proper sizing of the structural elements that ensure the safety of the reservoir. <\/p>\n\n<h2 id=\"fasi-2-3-posa-reinterro-e-riempimenti-controllati\" class=\"wp-block-heading\">Phases 2\u20133: Installation, Backfilling, and Controlled Filling<\/h2>\n\n<p class=\"wp-block-paragraph\">After Phase 1, proceed with the installation and backfilling operations \u201cas described in the previous backfilling procedures (in the absence of an aquifer),\u201d dividing them into <strong>Phases 2\u20133<\/strong>.<\/p>\n\n<h3 id=\"fase-2-riempimenti-e-riempimento-serbatoio\" class=\"wp-block-heading\">Step 2: Filling and Tank Filling<\/h3>\n\n<p class=\"wp-block-paragraph\">Planned activities:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Subsequent backfilling with fine sand or silt<\/strong><\/li>\n\n\n\n<li><strong>Next, fill the tank<\/strong><\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">The sequence of operations is part of the system&#8217;s control logic: while backfilling is underway, the tank is also being filled as planned.<\/p>\n\n<h3 id=\"fase-3-completamenti-prolunghe-e-sigillature\" class=\"wp-block-heading\">Step 3: Finishing Touches, Extensions, and Sealing<\/h3>\n\n<p class=\"wp-block-paragraph\">Planned activities:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Further backfilling with fine sand or silt<\/strong><\/li>\n\n\n\n<li><strong>Installation of metal extensions<\/strong>, if any<\/li>\n\n\n\n<li><strong>Properly sealed<\/strong> extensions<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">At this stage, in addition to continuing the filling process, the required accessory components (such as extensions) are installed, with particular attention paid to sealing.<\/p>\n\n<h2 id=\"fase-4-chiusura-dellinterro-e-valutazione-dei-carichi-in-superficie\" class=\"wp-block-heading\">Step 4: Backfilling and Assessment of Surface Loads<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>Phase 4<\/strong> involves<strong>completing the backfilling<\/strong>. At the same time, if the surface is <strong>accessible to heavy vehicles<\/strong>, you should <strong>consult a professional to determine<\/strong> whether a <strong>slab capable of distributing the loads<\/strong> is needed before installing the final pavement. <\/p>\n\n<p class=\"wp-block-paragraph\">Important note: The <strong>heat-dissipating slab<\/strong> must have a <strong>larger plan area than that of the tank<\/strong> in order to effectively dissipate the loads.<\/p>\n\n<h2 id=\"allacciamenti-idraulici-tubazioni-e-giunti-flessibili-per-ridurre-il-rischio\" class=\"wp-block-heading\">Hydraulic Connections: Pipes and Flexible Fittings to Reduce Risk<\/h2>\n\n<p class=\"wp-block-paragraph\">In presence of aquifers, it is recommended to consider installing the following on <strong>water supply connections<\/strong>:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>appropriate piping<\/strong><\/li>\n\n\n\n<li><strong>flexible joints<\/strong><\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">The goal is <strong>to minimize the risk of potential failures as much as possible<\/strong>. This measure is directly related to the \u201cdynamic\u201d conditions typical of environments with groundwater, where it is useful to incorporate elements that help manage stresses and movements. <\/p>\n\n<h2 id=\"conclusione\" class=\"wp-block-heading\">Conclusion<\/h2>\n\n<p class=\"wp-block-paragraph\">Burying a tank in presence of an aquifer requires a systematic approach: verify the maximum groundwater level, install drainage systems, plan the excavation and slopes to prevent landslides, construct the foundation slab and anchors to withstand hydrostatic pressure, and then complete the installation and backfilling in the four planned phases.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tank Installation in the Presence of an Aquifer: Here\u2019s What to Check Before Excavation and How to Manage Drainage, the Foundation Slab, and Anchors. A practical 4-step guide for planning installation and backfilling, with special attention to the risk of damage to connections. <\/p>\n","protected":false},"featured_media":8024,"parent":0,"template":"","meta":{"_acf_changed":false,"_angie_page":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"tags":[792,794,779,659,795,793,778,776,796],"class_list":["post-8022","esperto-risponde","type-esperto-risponde","status-publish","has-post-thumbnail","hentry","tag-aquifer","tag-drainage","tag-excavation","tag-flexible-joints","tag-foundation-slab","tag-hydrostatic-thrust","tag-re-excavation","tag-tank-inspection","tag-tie-rods"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/esperto-risponde\/8022","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/esperto-risponde"}],"about":[{"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/types\/esperto-risponde"}],"version-history":[{"count":0,"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/esperto-risponde\/8022\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/media\/8024"}],"wp:attachment":[{"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/media?parent=8022"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/tags?post=8022"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}