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State the method for rainwater harvesting.

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Answer
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Hint: Rainwater harvesting is a simple technique which is used to conserve the rainwater by collecting, storing, conveying and purifying. It runs off from the rooftops, roads, parks, open grounds, etc., for later use.

Complete step-by-step answer:
The rainwater harvesting system consists of a catchment which is used to collect and store the rainwater. To transport the harvested water from the catchment area to the recharge zone, a conveyance system is used. A flush is used to redden out the first spell of rain. A filter is used to filter the collected rainwater and also to remove the pollutants. The filtered water which is ready to use is stored in tanks and the recharge structures. This process of rainwater harvesting involves the collection of water and its storage with the help of artificial design systems that naturally runoff or the man-made areas like the rooftop, rock surface, compounds, hill slopes, artificially repaired semi pervious or impervious land surface. There is a scarcity of good quality of water these days, which has become a significant concern. Rainwater is the purest form of water and of good quality which is used for irrigation, cooking, cleaning, washing, and bathing and for other livestock requirements. This method of rainwater harvesting is simple and low cost. It also helps in reducing the water bill.

Note: One of the best methods which are practised and followed for the conservation of water is rainwater harvesting method. The surface runoff harvesting and rooftop rainwater harvesting are the two methods of rainwater harvesting when it is broadly classified.