3. Rooftop Rainwater Harvesting

The difficulty in maintaining a clean environment on the rooftops of buildings which acts as catchment areas is a probable cause with results in the contamination of the rainwater that is being harvested, and hence, it is recommended that use of rooftop harvested water for drinking and even for domestic use should be done only after it has been subjected to prior treatment. A majority of government reports suggest that India is suffering from the worst water crisis in its history, and millions of lives and livelihoods are under threat. As per the records of the Ministry of Housing and Urban Affairs, there has been an increase in urban population from 29 crores in 2001 to 37.70 crores in 2011 which is approximately a 30% increase along with this the urban towns too have risen from 5161 to 7935 in the same period. This has resulted in an increase in the demand for water in the urban areas, at a time when these metropolitan cities in the country are already facing acute shortage of drinking water in the summers this despite the fact that these cities experience good rainfall and flooding water logging of streets in the monsoon period. The very fact that water harvested is water produced and thus the need to make sincere attempts to harvest every drop of water that falls within every premises, locality, city, and country.