The Bangalore Water Supply and Sewerage Board (BWSSB) has gazetted the rain water harvesting regulations, giving a clear picture on how to install the RWH system.
As per the regulations, under the roof-based RWH, rainwater has to be harvested for use through a filter into a storage tank or for recharge of an open well.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/govt-comes-rwh-regulations
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-herald-bangalore
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-harvesting
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/root-crops
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bangalore-t
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater-regulation