{"id":10235,"date":"2025-05-23T16:04:47","date_gmt":"2025-05-23T14:04:47","guid":{"rendered":"https:\/\/www.pronal.com\/?p=10235"},"modified":"2025-05-23T16:40:35","modified_gmt":"2025-05-23T14:40:35","slug":"drought-define-your-rainwater-harvesting-system","status":"publish","type":"post","link":"https:\/\/www.pronal.com\/en\/drought-define-your-rainwater-harvesting-system\/","title":{"rendered":"Drought is coming: define your rainwater harvesting system right now!"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text css_animation=&#8221;top-to-bottom&#8221;]The year 2020 has known a difficult start and it\u2019ll not end with the drought, which promises to be alarming for this summer. Until now, African countries were mainly affected, but today <span style=\"color: #00a7e1;\">it\u2019s the world that has to face increasingly frequent and long periods of drought. <\/span>In France, more <span style=\"color: #00a7e1;\">than 66 departments are already on drought alert<\/span>. Rainwater harvesting remains the best way to counter this scourge. Many solutions are existing, such as <span style=\"color: #00a7e1;\">the flexible tank<\/span>, for rainwater and runoff water storage. But do you know how to define your water needs and determine the ideal volume for your tank?[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css_animation=&#8221;left-to-right&#8221;]<\/p>\n<h2><span style=\"font-weight: 400; font-size: 18pt; color: #00a7e1;\">Why install a rainwater harvesting system?<\/span><\/h2>\n<p>Whether you are a farmer or a factory, rainwater harvesting has many ecological advantages. <span style=\"color: #00a7e1;\">To install a rainwater harvesting system allow to reduce the use of drinking water in order to preserve the planet.<\/span> But not only that!<\/p>\n<p>Indeed, water recovery can also offer <span style=\"color: #00a7e1;\">economic advantages<\/span>. For example, every year, the agriculture consumes almost 4.7 billion m3 of water. At the average price per m3 of mains water, this volume corresponds to 17 billion euros.<\/p>\n<p>Motivated by the environment and economic aspect, these free waters will be re-employed for :<\/p>\n<ul>\n<li><span style=\"color: #00a7e1;\">watering animals,<\/span><\/li>\n<li><span style=\"color: #00a7e1;\">phytosanitary preparation,<\/span><\/li>\n<li><span style=\"color: #00a7e1;\">process of manufacturing,<\/span><\/li>\n<li><span style=\"color: #00a7e1;\">cleaning of buildings or equipment,<\/span><\/li>\n<li><span style=\"color: #00a7e1;\">small irrigations,<\/span><\/li>\n<li><span style=\"color: #00a7e1;\">fire protection,<\/span><\/li>\n<li><span style=\"color: #00a7e1;\">or comfort in the event of restrictions.<\/span><\/li>\n<\/ul>\n<p>Moreover recovering runoff is important to avoid the risk of flooding (<a href=\"https:\/\/www.pronal.com\/en\/product\/barriers\/protecflood-flood-barriers\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"text-decoration: underline;\"><span style=\"color: #00a7e1; text-decoration: underline;\">see our inflatable anti-flood system<\/span><\/span><\/a>).[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css_animation=&#8221;right-to-left&#8221;]<\/p>\n<h2><span style=\"font-weight: 400; font-size: 18pt; color: #00a7e1;\">Why choose a flexible tank?<\/span><\/h2>\n<p>The <span style=\"text-decoration: underline;\"><span style=\"color: #00a7e1; text-decoration: underline;\"><a style=\"color: #00a7e1; text-decoration: underline;\" href=\"https:\/\/www.pronal.com\/en\/product\/flexible-storage-tanks\/flexible-water-tanks\/\" target=\"_blank\" rel=\"noopener noreferrer\">flexible tank<\/a><\/span><\/span> is self-supporting closed storage. Created with high resistance technical tissues, it guarantees <span style=\"color: #00a7e1;\">the long-term storage of clean water protected from all contamination and evaporation<\/span>. It is Economic and remains <span style=\"color: #00a7e1;\">70% less expensive<\/span> than other traditional solutions. This flexible tank doesn\u2019t require any civil engineering, no maintenance, and can be deployed easily and quickly. Furthermore, its fabric allows it to withstand high temperatures. <span style=\"color: #00a7e1;\">Perfect<\/span> in every way.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;10223&#8243; img_size=&#8221;large&#8221; css_animation=&#8221;top-to-bottom&#8221;][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;10216&#8243; img_size=&#8221;large&#8221; css_animation=&#8221;top-to-bottom&#8221;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css_animation=&#8221;left-to-right&#8221;]<\/p>\n<h2><span style=\"font-weight: 400; font-size: 18pt; color: #00a7e1;\">How to define its water needs by applications? (Agricultural) ?<\/span><\/h2>\n<p>Some applications need more or less water volume compared to others. To help you, we have realized some examples to calculate your water needs according to your farms :<\/p>\n<table style=\"border-collapse: collapse; width: 0%; height: 149px;\" border=\"1\">\n<tbody>\n<tr style=\"height: 21px;\">\n<td style=\"width: 27.7971%; height: 21px; background-color: #e0e0e0;\"><span style=\"font-weight: 400;\">1 dairy cow<\/span><\/td>\n<td style=\"width: 26.0562%; height: 21px;\"><span style=\"font-weight: 400;\">120 to 140 l \/ day<\/span><\/td>\n<td style=\"width: 28.9653%; height: 21px; background-color: #e0e0e0;\">1 serum pork<\/td>\n<td style=\"width: 36.4485%; height: 21px;\"><span style=\"font-weight: 400;\">15 to 20 l \/ day<\/span><\/td>\n<\/tr>\n<tr style=\"height: 21px;\">\n<td style=\"width: 27.7971%; height: 21px; background-color: #e0e0e0;\">1 adult cattle<\/td>\n<td style=\"width: 26.0562%; height: 21px;\"><span style=\"font-weight: 400;\">50 to 60 l \/ day<\/span><\/td>\n<td style=\"width: 28.9653%; height: 21px; background-color: #e0e0e0;\"><span style=\"font-weight: 400;\">1 horse<\/span><\/td>\n<td style=\"width: 36.4485%; height: 21px;\"><span style=\"font-weight: 400;\">50 to 60 l \/ day<\/span><\/td>\n<\/tr>\n<tr style=\"height: 21px;\">\n<td style=\"width: 27.7971%; height: 21px; background-color: #e0e0e0;\">1 sheep or 1 goat<\/td>\n<td style=\"width: 26.0562%; height: 21px;\"><span style=\"font-weight: 400;\">5 to 8 l \/ day<\/span><\/td>\n<td style=\"width: 28.9653%; height: 21px; background-color: #e0e0e0;\"><span style=\"font-weight: 400;\">100 chickens<\/span><\/td>\n<td style=\"width: 36.4485%; height: 21px;\"><span style=\"font-weight: 400;\">10 to 12 l \/ day<\/span><\/td>\n<\/tr>\n<tr style=\"height: 21px;\">\n<td style=\"width: 27.7971%; height: 21px; background-color: #e0e0e0;\">1 pregnant sow<\/td>\n<td style=\"width: 26.0562%; height: 21px;\"><span style=\"font-weight: 400;\">15 to 20 l \/ day<\/span><\/td>\n<td style=\"width: 28.9653%; height: 21px; background-color: #e0e0e0;\">100 hens<\/td>\n<td style=\"width: 36.4485%; height: 21px;\"><span style=\"font-weight: 400;\">35 to 40 l \/ day<\/span><\/td>\n<\/tr>\n<tr style=\"height: 21px;\">\n<td style=\"width: 27.7971%; height: 21px; background-color: #e0e0e0;\">1 suckler sow<\/td>\n<td style=\"width: 26.0562%; height: 21px;\"><span style=\"font-weight: 400;\">25 to 30 l \/ day<\/span><\/td>\n<td style=\"width: 28.9653%; height: 21px; background-color: #e0e0e0;\">100 hens in battery<\/td>\n<td style=\"width: 36.4485%; height: 21px;\"><span style=\"font-weight: 400;\">50 to 60 l \/ day<\/span><\/td>\n<\/tr>\n<tr style=\"height: 44px;\">\n<td style=\"width: 27.7971%; height: 44px; background-color: #e0e0e0;\">1 fattening pig<\/td>\n<td style=\"width: 26.0562%; height: 44px;\"><span style=\"font-weight: 400;\">7 to 10 l \/ day<\/span><\/td>\n<td style=\"width: 28.9653%; height: 44px; background-color: #e0e0e0;\"><span style=\"font-weight: 400;\">100 rabbits<\/span><\/td>\n<td style=\"width: 36.4485%; height: 44px;\"><span style=\"font-weight: 400;\">30 to 40 l \/ day<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>About the irrigation of agricultural crops, the flexible tank is more appropriated for <span style=\"color: #00a7e1;\">storage named \u201cbuffer\u201d<\/span>. Indeed, it can be used <span style=\"color: #00a7e1;\">to empty your water harvesting system who is already in place or to store pumping water present in your wells and\/or falsifiers after a thunderstorm<\/span>. Consequently, drip systems can be implemented on your more distant crops. Think about it! <span class=\"c-emoji c-emoji__medium c-emoji--inline\" data-qa=\"emoji\" data-sk=\"tooltip_parent\" aria-describedby=\"sk-tooltip-6047\"><img decoding=\"async\" src=\"https:\/\/a.slack-edge.com\/production-standard-emoji-assets\/10.2\/google-medium\/1f609.png\" alt=\":clin_d'\u0153il:\" aria-label=\"\u00c9moji clin d&amp;#39;\u0153il\" data-stringify-type=\"emoji\" data-stringify-emoji=\":wink:\" \/><\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css_animation=&#8221;right-to-left&#8221;]<\/p>\n<h2><span style=\"font-weight: 400; font-size: 18pt; color: #00a7e1;\">How to determine the collection capacity of your roof?<\/span><\/h2>\n<p style=\"font-weight: 400;\">And yes, your rainwater yield also depends on <span style=\"color: #00a7e1;\">the surface of your roof<\/span>! To calculate it, you just need to do this simple calculation <span style=\"color: #00a7e1;\">S (m2) x PV (l \/ m2) x Ct<\/span> with:<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"color: #00a7e1;\">S<\/span> = Surface of your roof (generally corresponding to that of your building, without taking into account the inclination),<\/li>\n<li style=\"font-weight: 400;\"><span style=\"color: #00a7e1;\">VP<\/span> = Rainfall value (the local amount of annual precipitation, obtain it from your town hall),<\/li>\n<li style=\"font-weight: 400;\">and <span style=\"color: #00a7e1;\">Ct<\/span> = Roofing coefficient.<\/li>\n<\/ul>\n<p>The coefficient of the roof varies depending on <span style=\"color: #00a7e1;\">the type of roof<\/span> you have. Don\u2019t worry, we give you everything below:<\/p>\n<table style=\"border-collapse: collapse; width: 38.0134%; height: 198px;\" border=\"1\">\n<tbody>\n<tr style=\"height: 21px;\">\n<td style=\"width: 40.9908%; background-color: #00aaff; text-align: center; height: 21px;\"><span style=\"color: #f7f7f7;\">Type of roof<\/span><\/td>\n<td style=\"width: 20.2935%; background-color: #00aaff; text-align: center; height: 21px;\"><span style=\"color: #f7f7f7;\">Coefficient<\/span><\/td>\n<\/tr>\n<tr style=\"height: 68px;\">\n<td style=\"width: 40.9908%; height: 68px;\">Clay roof tile, baked and glazed<\/td>\n<td style=\"width: 20.2935%; text-align: center; height: 68px;\">0.9<\/td>\n<\/tr>\n<tr style=\"height: 44px;\">\n<td style=\"width: 40.9908%; height: 44px;\">Cement or slate roof tile<\/td>\n<td style=\"width: 20.2935%; text-align: center; height: 44px;\">0.8<\/td>\n<\/tr>\n<tr style=\"height: 44px;\">\n<td style=\"width: 40.9908%; height: 44px;\">Flat roof with gravel<\/td>\n<td style=\"width: 20.2935%; text-align: center; height: 44px;\">0.6<\/td>\n<\/tr>\n<tr style=\"height: 21px;\">\n<td style=\"width: 40.9908%; height: 21px;\">Green roof<\/td>\n<td style=\"width: 20.2935%; text-align: center; height: 21px;\">0.4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>Keep your two results, they will serve you for the third and final step which follows.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css_animation=&#8221;left-to-right&#8221;]<\/p>\n<h2><span style=\"font-weight: 400; font-size: 18pt; color: #00a7e1;\">How to size your tank?<\/span><\/h2>\n<p style=\"font-weight: 400;\">Once you have calculated your water need according to your application and your collection capacity, it remains to define the ideal volume of your flexible tank. For this, it will be necessary to take into account <span style=\"color: #00a7e1;\">the formula calculation factor x K<\/span>:<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"color: #00a7e1;\">the calculation factor<\/span>: the smallest value between the amount of water captured by your roof and your need for rainwater,<\/li>\n<li style=\"font-weight: 400;\">and <span style=\"color: #00a7e1;\">the K<\/span>: the constant which is 0.0625.<\/li>\n<\/ul>\n<p>Here, you have all the keys in hand to define your rainwater recovery system. If you liked this article, we invite you to also read our article <span style=\"text-decoration: underline;\"><span style=\"color: #00a7e1; text-decoration: underline;\"><a style=\"color: #00a7e1; text-decoration: underline;\" href=\"https:\/\/www.pronal.com\/en\/3-raisons-dutiliser-la-citerne-souple-de-stockage-eau-pour-votre-systeme-dirrigation\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u201c3 reasons to use the flexible water storage tank for your irrigation system\u201d<\/a>.<\/span><\/span>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text css_animation=&#8221;top-to-bottom&#8221;]The year 2020 has known a difficult start and it\u2019ll not end with the drought, which promises to be alarming for this summer. Until now, African countries were mainly&#8230;<\/p>\n","protected":false},"author":3,"featured_media":4910,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[134],"tags":[370,369,444],"class_list":["post-10235","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-advices-tutorials","tag-agriculture-en","tag-eau","tag-eau-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Drought, define your rainwater harvesting system - Pronal<\/title>\n<meta name=\"description\" content=\"Pronal helps you to calculate and define the best rainwater harvesting system for your needs of irrigation, watering animals, cleaning buildings...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pronal.com\/en\/drought-define-your-rainwater-harvesting-system\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Drought, define your rainwater harvesting system - 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