Question

what is meant by rainwater harvesting mention the method used for it

Answer 1

rainwater harvesting means to collect the rain water
metofs
you can make huge tanks on your roof to collect rainwater
then purify the collected water
and use it for your various house hold purposes
hope it helps u

Answer 2

heya,

rainwater harvesting is storing the rainwater and reusing it such as peoples make dams to store rain water and then they reuse it.
dams are very useful to store rainwater.
for storing rain water peoples make a big well and then they use it in agriculture, bathing animals, etc.

thank you.