Rainwater harvesting system

Rainwater harvesting system

Rainwater harvesting system is used for water efficiency in Green Building. Rainwater harvesting captures, diverts, and stores rainwater for later use. Implementing rainwater harvesting is beneficial because it reduces demand on existing water supply, and reduces run-off, erosion, and contamination of surface water. Home systems can be relatively simple to install and operate and it may reduce your water bill.


First of all rainwater is captured off rooftops and other surfaces, sent through an inlet filtration device designed to remove debris before storage in a tank. Inlet filters can be located in a variety of locations depending on site constraints.

Roof Catchment: Your roof accounts for a large surface-area, and when it rains, this water is typically routed through a system of gutters and pipes and dumped unceremoniously into your yard, where it washes away valuable topsoil. Roof catchment systems, which are the most common type for residential applications, collect this water by routing it through a system of gutters and pipes into a cistern, usually located on the ground level. The choice of roofing material is extremely important as some types can contaminate the water, such as those with coatings or metallic finishes or asphalt. Acceptable roofing materials for catchment systems include aluminum, tiles and slate or galvanized corrugated iron.

Ground Catchment: A ground rainwater harvesting system is a more simple approach than the rooftop version and offers the possibility of a wider catchment area. Water may be collected via drain pipes or earthen dams and stored above or below ground in tanks. The quality of water may be lower at the ground level, rendering the captured water suitable for landscaping needs only.


Secondly, collected rainwater is stored in a tank or cistern which can be located above or below ground. Depending on the project’s requirements, tanks are available in a variety of materials, with plastic (polyethylene), fiberglass, or galvanized steel the most common.

At last all rainwater harvesting systems require a rainwater control station to manage the system as well as treat and pump water. Water is distributed from the storage tank via pumps. Many applications also require filtering the water before pumping in order to safeguard non-potable water quality.


Rain does more than simply provide drinking water. It also supplies homes with a renewable source of water that can be harvested, collected and stored for various purposes, including irrigating gardens, cleaning, washing clothes and more. Promotes both water and energy conservation. Rainwater harvesting has been around for decades, but only recently has it received national attention due to water shortages throughout the United States. However, that rainwater harvesting systems require regular maintenance, such as cleaning the roof surface, piping and storage container to prevent the water from becoming contaminated. Also, standing water is a natural mosquito breeding ground, so you must use netting or other devices to keep them out. Cisterns can be unsightly. It is possible to camouflage them, and if you are really concerned about the aesthetic impact, then opt for an underground version.



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