Estimates of how much water can be harvested in Delhi are mindboggling. According to estimates by Centre for Science and Environment, 5,600 billion litres of rainwater can be harvested in Delhi every year.
In fact, my estimate was 11217960000 litres of rainwater each year if 30.6 sq km of rooftop was used!!!
— AAP In News (@AAPInNews) June 20, 2015
— Aam Aadmi Party (@AamAadmiParty) July 30, 2015