Question

what do you mean by rain water haevesting?

Answer 1

Rainwater harvesting is the accumulation and storage of rainwater for reuse on-site, rather than allowing it to run off .
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Answer 2

Rain water harvesting (REH) is a technique of collection and storage of rain water into natural reservories or tanks ,or the infiltration of surface of water into subsurface aquifers .

One method of rain harvesting is rooftop harvesting