It is now possible to calculate the amount of rainwater that can be harvested from the roof of houses thanks to a new smart phone app developed by UN Environment and the United Nations Educational,
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/innovative-smart-phone-app-improve-rainwater-harvesting-africa
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/relief-web
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-supply
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-harvesting
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-management
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change