{"id":4076,"date":"2026-10-12T09:32:47","date_gmt":"2026-10-12T07:32:47","guid":{"rendered":"https:\/\/www.di-camillo.com\/underground-rainwater-tanks-technical-guide\/"},"modified":"2026-10-12T09:32:47","modified_gmt":"2026-10-12T07:32:47","slug":"underground-rainwater-tanks-technical-guide","status":"publish","type":"post","link":"https:\/\/www.di-camillo.com\/en\/underground-rainwater-tanks-technical-guide\/","title":{"rendered":"Underground rainwater tanks: a technical guide to water harvesting and corporate water management"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The water crisis that hit Italy this summer, between climate change and extreme temperatures, has shown once again how efficient management of water resources in the industrial, agricultural and construction sectors has become increasingly strategic in recent years.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The need is <strong>increasingly to store substantial volumes of water safely<\/strong><\/span><span style=\"font-weight: 400;\">. <\/span><span style=\"font-weight: 400;\">Companies<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">however<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">do not always have the space required for large tanks and reservoirs. Installing <a href=\"https:\/\/www.di-camillo.com\/en\/products\/underground-polyethylene-water-tanks\/\" target=\"_blank\" rel=\"noopener\">underground rainwater tanks<\/a> is therefore today the engineering standard for optimising surface space and ensuring that resources are preserved over time.\u00a0<\/span><\/p>\n<h2><b>The advantages of underground water storage\u00a0<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Placing storage tanks below ground level solves two fundamental problems<\/span><span style=\"font-weight: 400;\">: <\/span><span style=\"font-weight: 400;\">one logistical (optimising surface space) and one biological (preserving the fluid)<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The surrounding ground acts as a natural thermal insulator<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">keeping the<strong> water at a constant temperature<\/strong> between <strong>8 <\/strong><\/span><strong>\u00b0C and 12 \u00b0C<\/strong><span style=\"font-weight: 400;\">. <\/span><span style=\"font-weight: 400;\">This thermal stability<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">combined with the complete absence of direct solar radiation<\/span><span style=\"font-weight: 400;\">, <\/span><strong>inhibits photosynthesis and prevents the proliferation of algae and photosynthetic bacteria.\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Compared with above<\/span><span style=\"font-weight: 400;\">&#8211;<\/span><span style=\"font-weight: 400;\">ground solutions<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">underground storage offers further structural benefits:\u00a0<\/span><\/p>\n<ul>\n<li><strong>no footprint on yards and goods-handling areas<\/strong><span style=\"font-weight: 400;\">;\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"><strong>protection<\/strong> from the weather<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">winter frosts and accidental mechanical damage<\/span><span style=\"font-weight: 400;\">;\u00a0<\/span><\/li>\n<li><strong>stability of the non-<\/strong><span style=\"font-weight: 400;\"><strong>potable water<\/strong> intended for secondary uses, which retains its organoleptic and physico<\/span><span style=\"font-weight: 400;\">&#8211;<\/span><span style=\"font-weight: 400;\">chemical <\/span><span style=\"font-weight: 400;\">properties.\u00a0<\/span><\/li>\n<\/ul>\n<h2><b>Construction materials<\/b><b>: <\/b><b>the properties of high<\/b><b>&#8211;<\/b><b>density polyethylene (HDPE)\u00a0<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Tanks intended for burial for rainwater harvesting are mainly produced by <strong>rotational moulding.<\/strong> The resulting monolithic structure, free of joints or welds, ensures complete water<\/span><span style=\"font-weight: 400;\">&#8211;<\/span><span style=\"font-weight: 400;\">tightness and eliminates the critical points subject to leaks or <\/span><span style=\"font-weight: 400;\">structural failure under load<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The<strong> high<\/strong><\/span><strong>&#8211;<\/strong><span style=\"font-weight: 400;\"><strong>density polyethylene (HDPE)<\/strong> they are made of offers several advantages that make it suitable for contact with the ground:\u00a0<\/span><\/p>\n<ul>\n<li><b>electrochemical stability<\/b><span style=\"font-weight: 400;\">: <\/span><span style=\"font-weight: 400;\">unlike metals<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">polyethylene does not suffer from galvanic corrosion or rust caused by stray <\/span><span style=\"font-weight: 400;\">currents or soil moisture;\u00a0<\/span><\/li>\n<li><b>chemical inertness<\/b><span style=\"font-weight: 400;\">: <\/span><span style=\"font-weight: 400;\">the material does not alter the chemical composition of the stored water and withstands any aggressive substances present in the backfill;\u00a0<\/span><\/li>\n<li><b>structural flexibility<\/b><span style=\"font-weight: 400;\">: the external reinforcing ribs distribute the lateral earth pressures and the internal hydrostatic pressures evenly.\u00a0<\/span><\/li>\n<\/ul>\n<h2><b>Sizing criteria and filtration system\u00a0<\/b><\/h2>\n<p><strong>The efficiency of a water harvesting system depends on correctly calculating the tank volume<\/strong><span style=\"font-weight: 400;\"><strong>.<\/strong> <\/span><span style=\"font-weight: 400;\">Sizing must balance the <\/span><span style=\"font-weight: 400;\">yield of the catchment with the water demand of the user<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The key parameters for determining the useful volume are:\u00a0<\/span><\/p>\n<ul>\n<li><b>mean annual rainfall (mm)<\/b><span>, <\/span><span>taken from the historical rainfall data of the local weather station; <\/span><b>catchment area (m2<\/b><span>)<\/span><span>: <\/span><span>the horizontal extent of the roofs or yards draining to the tank<\/span><span>;\u00a0<\/span><\/li>\n<li><b>runoff coefficient (C)<\/b><span style=\"font-weight: 400;\">: a dimensionless value that accounts for the surface material <\/span><span style=\"font-weight: 400;\">(<\/span><span style=\"font-weight: 400;\">e.g. C <\/span><span style=\"font-weight: 400;\">= <\/span><span style=\"font-weight: 400;\">0.9 for tiled or membrane <\/span><span style=\"font-weight: 400;\">roofs; C = 0.8 for asphalt paving)<\/span><span style=\"font-weight: 400;\">;\u00a0<\/span><\/li>\n<li><b>annual water demand (m3)<\/b><span style=\"font-weight: 400;\">: <\/span><span style=\"font-weight: 400;\">calculated from the users to be served or from the planned washing\/irrigation cycles<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">A widely used empirical formula for calculating the tank volume (V) suggests sizing the storage for between <strong>21 and 30 days<\/strong> of demand or of rainfall yield:\u00a0<\/span><\/p>\n<p><b>V = min (annual supply; annual demand) \u00d7 0.06\u00a0<\/b><\/p>\n<h2><b>Di Camillo Srl support for corporate water management\u00a0<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Choosing the most suitable storage system requires careful analysis of rainfall volumes<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">soil type and local regulatory constraints<\/span><span style=\"font-weight: 400;\">. <\/span><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.di-camillo.com\/en\/who-we-are\/\" target=\"_blank\" rel=\"noopener\">Di Camillo Srl<\/a> offers farms<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">industrial plants and construction companies a dedicated technical assistance <\/span><span style=\"font-weight: 400;\">and consultancy service<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><strong>Our technicians assist you in selecting the underground high-density polyethylene tanks, <\/strong><span style=\"font-weight: 400;\">the filtration systems and the certified first<\/span><span style=\"font-weight: 400;\">&#8211;<\/span><span style=\"font-weight: 400;\">flush tanks best suited to the specific needs of your site or plant.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.di-camillo.com\/en\/contacts\/\" target=\"_blank\" rel=\"noopener\">Di Camillo Srl technicians and engineers <\/a><strong>are available for technical advice and a tailored quotation<\/strong><\/span><strong>.\u00a0<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The water crisis that hit Italy this summer, between climate change and extreme temperatures, has shown once again how efficient&#8230;<\/p>\n","protected":false},"author":4,"featured_media":842,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4076","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-categorizzato"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Underground rainwater tanks: technical and regulatory guide - Di Camillo Serbatoi S.r.l.<\/title>\n<meta name=\"description\" content=\"A guide to choosing the right underground rainwater tank for your company&#039;s needs\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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