The Union Government has told Delhi High Court that it is considering a proposal to harvest rain water on roof tops of residential and non-residential buildings having a roof area of 100 square metre
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/govt-open-rain-water-harvesting
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/pioneer-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/dams
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/irrigation