Question

what is rainwater harvesting? what are the two ways in which it can be done?

Answer 1

Rain water harvesting (RWH) is a technique of collection and storage of rainwater into natural reservoirs or tanks, or the infiltration of surface water into subsurface aquifers (before it is lost as surface runoff). One method of rainwater harvesting is rooftop harvesting.

Answer 2

the collection of rain date from the roof top and street corner is called rain water harvesting
one method is roof top harvesting