Suggestions Invited For Large-Scale Rainwater Harvesting

Rain Water Harvesting is most essential on earth. We, the people in Assam are lucky enough that still we are getting enough rain and water. That's why we do not bother about water. But, we have seen that in the dry season, particularly in the city like Guwahati, people don't get consumable water, well/ponds get dry due to excessive under-ground water exploitation. If we start RWH, (it should be done by every household) crisis of water will diminish.