[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-135596-105":59,"doc-detail-135596-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","rainwater-harvesting-rwh-handbook-system-installation-sizing-and-maintenance","Rainwater Harvesting (RWH) Handbook - System Installation, Sizing and Maintenance","","Rainwater Harvesting (RWH) guidance explains how to collect rainfall and deliver cleaner stored water for household uses. It covers protecting the storage tank from sunlight to reduce algae, configuring inflow and extraction to disturb sediment less, and selecting components such as first-flush devices and inlet/outlet screens that block debris and mosquitoes. The brochure also outlines storage sizing factors, disinfection steps for drinking water, and ongoing maintenance actions to keep roof, gutters, filters, and tanks in safe condition.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/rainwater-harvesting-rwh-handbook-system-installation-sizing-and-maintenance/135596/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/rainwater-harvesting-rwh-handbook-system-installation-sizing-and-maintenance/135596.png","ImageObject",300,407,{"name":92,"@type":93},"Cipher","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-22","2026-08-21",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",12,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"Why should the storage tank exclude sunlight?","Question",{"text":113,"@type":114},"To prevent algal growth and protect the stored water quality.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How can the system reduce contamination entering the storage tank?",{"text":118,"@type":114},"Use a first-flush installation to hold initial roof runoff and install fine mesh screens at tank inlets and outlets to exclude debris and mosquitoes.",{"name":120,"@type":111,"acceptedAnswer":121},"What steps are recommended to disinfect rainwater intended for drinking?",{"text":122,"@type":114},"Add bleaching powder at 10 mg per litre (25% free chlorine), shake and leave for 30 minutes, and boil drinking water for at least 3 minutes, especially for vulnerable people.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},135596,1787315749,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":14,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":130,"read_time":24},687208528416,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","The tank must exclude sunlight to prevent algal growth.  \nIncoming water should be separated from the stored water by a down-pipe that descends to near the bottom of the tank. This minimizes disturbance of fine sediment that may have accumulated at the tank bottom. To extract the cleanest top layer of water, a flexible intake hose attached to a float is recommended.  \nThe following diagrams illustrate installations of inflow and extraction arrangement in the tank.  \n(a) Inflow (b) Outflow  \nDownpipe  \nBreak ring  \nSince the storage needs to be installed below the elevation of the roof, a pump will be required to lift and circulate the water through the house.  \nSizing of the storage  \nThe capacity of the storage depends mainly on the size of your household, your consumption rate and the reliability of your primary water supply. If your home is to be totally reliant on rainwater, the size of your storage will need tobe greater.  \nSafety suggestions  \nDisinfection of water intended for drinking is recommended particularly for use by persons with weakened or compromised immune systems, such as the ill, the very young or very old, and recovering patients.  \nTo disinfect your water, add 10 milligrams of bleaching powder (containing 25% of free chlorine) per litre of water, shake and leave to stand for 30 minutes. It is also recommended that you boil water intended for drinking for at least 3 minutes.  \nMaintaining your RWH  \nMaintenance of your RWH system is of great importance to ensure the best water quality.  \n• Keep your roof, guttering and filters free of any accumulated organic matter (leaves, animal droppings), and clean the first-flush component periodically;  \n• Clean the storage tank annually with a chlorine solution;  \n• Repair any cracks in the tank;  \n• Seal off any holes in the screens;  \n• Drain, clean and disinfect the tank immediately if the water becomes contaminated by a dead insects or rodents;  \n• Prevent mosquitoes from breeding in the tank by applying domestic kerosene ( not power kerosene for equipment use) at a concentration of 5 mL per 1,000 litres of water.  \nFor further information about RWH, contact:  \nCaribbean Environmental Health Institute The Morne, P.O. Box 1111  \nCastries, St. Lucia  \nTel: 758-452-2501  \nFax: 758-453-2721  \nEmail: [cehi@candw.lc](cehi@candw.lc)[ ](cehi@candw.lc)You can download the RWH Handbook [at www.cehi.org.lc](at www.cehi.org.lc)  \nAn initiative of the Caribbean Environmental Health Institute (CEHI) in partnership with the United Nations Environment Programme (UNEP)  \nWhat is Rainwater Harvesting (RWH)?  \nRainwater harvesting (RWH) is an old tradition dating back over 4,000 years. It is simply the collecting of rainfall for use.  \nIn many parts of the world including the Caribbean, rainwater is the primary source of water for many households where potable or pipeborne supplies are not adequately available.  \nWhy harvest rainwater?  \nIt is one of the easiest means of obtaining afresh supply of water for a wide variety of uses including:  \n• Laundry and toilet flushing  \n• Cooking  \n• Drinking  \n• Irrigation  \n• Livestock watering  \n• General washing  \nHaving your own rainwater harvesting system offers the security of having water available during water shortages and after natural disasters. You can save on your water bills by meeting some of your demands from rainwater.  \nThe RWH system  \nThe typical household RWH system consists of three main components:  \n1. The collection or catchment area  \n2. The conveyance system  \n3. Storage  \nFigure 1: A typical household RWH system  \nThe Collection or Catchment Area  \nGenerally, the rooftop of your house can be used as the collection/catchment area. The surface should be made from neutral materials, meaning that it should be free of harmful chemicals like bitumen or lead sheeting. Smooth metal roofs are best because they are less prone to contamination and water can run off easily.  \nThe Conveyance System  \nThis is the network of gutt","cbCaiaZigWzOpCQ7","https://ap.wps.com/l/cbCaiaZigWzOpCQ7","pdf",167918,"English","# What is Rainwater Harvesting (RWH)?\n## Why harvest rainwater?\n# The RWH system\n## The collection or catchment area\n## The conveyance system\n## First flush installation\n## Screens\n## Storage\n# Inflow and extraction arrangement\n# Sizing of the storage\n# Safety suggestions\n## Disinfection for drinking water\n# Maintaining your RWH","[{\"question\":\"Why should the storage tank exclude sunlight?\",\"answer\":\"To prevent algal growth and protect the stored water quality.\"},{\"question\":\"How can the system reduce contamination entering the storage tank?\",\"answer\":\"Use a first-flush installation to hold initial roof runoff and install fine mesh screens at tank inlets and outlets to exclude debris and mosquitoes.\"},{\"question\":\"What steps are recommended to disinfect rainwater intended for drinking?\",\"answer\":\"Add bleaching powder at 10 mg per litre (25% free chlorine), shake and leave for 30 minutes, and boil drinking water for at least 3 minutes, especially for vulnerable people.\"}]","Rainwater Harvesting (RWH) Handbook - System Installation, Sizing and Maintenance | PDF"]