Is rain water harvesting is a sustainable development?
Yes, of course.
‘Sustainable’ means that which does not result in an irreversible loss, depletion or damage in the ecosystem which in fact sustains life.
Rainwater harvesting meets that criterion.
Rainwater harvesting needs to be considered as a part of a long term and overall environmental plan towards more sustainable development. The advantages to us and the wider environment of preventing flooding and erosion of all the water courses are incalculable.
it is likely that rainfall patterns will continue to change bringing shorter but heavier bursts of rain causing flooding and soil erosion. Household water consumption is increasing per capita, and as the climate warms other usage will increase, so new ways will have to be found to reduce, reuse and retain water within the environmental system we inhabit.
Hope this helps :)