What is the use of rain water harvesting?
Answers
Answer:
Rainwater harvesting is a sustainable process that helps in preserving rain water for different purposes and for the future needs as well. Rainwater Harvesting is a method of collecting and storing rain water to be used for various purposes while it can be used in future as well.
Methods of Rainwater Harvesting
There are primarily two prevalent methods of rainwater harvesting that are used in most of the areas:
Surface Run-off Rainwater Harvesting: The rainwater that flows off in the urban areas can be collected and stored to recharge the groundwater level or the aquifer bed, instead of letting the water flow into the drains.
Rooftop Rainwater Harvesting: In rooftop harvesting the rainwater is directly collected from the roof of the buildings and transported either into a tank or an artificial aquifer. Through this method the harvested water can be used for daily use purposes (including drinking and cooking, only after purifying the water at a basic level) and for recharging the aquifers and help restore the groundwater levels.
Explanation:
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Global warming, climatic changes, increasing population, construction activities, industrialisation, etc. – all of these are likely to worsen the water shortage that we already face today. To deal with this problem, municipalities all over India have mandated rainwater harvesting (RWH).
However, its implementation remains inconsistent, as it is a seasonal and passive method of conserving water. At present, Chennai leads in the number of successfully implemented projects, with over five lakh installations. Cities like Ahmedabad and Delhi use purely recharging techniques. In Delhi’s Panchsheel Park Colony, for example, about 1,000 residents collected Rs 4.5 lakh to implement rainwater harvesting and in the process, have managed to save more than 170 million litres of water, annually. In Chennai and Bengaluru, rainwater from the roof is stored in sumps (underground water storage tanks) and surface run-off is used to recharge the soil. In places like Porbandar, the entire rainwater from the roof is stored in tanks.