Rain Water Harvesting
Rain Water Harvesting has been implemented successfully in different parts of India. This page has a list of such examples.
Rainwaterharvesting.org - has a lot of Information about RWH
Gobartimes article on how to do Rain Water Harvesting
Successful Examples: Chennai
Akash Ganga Chennai - Example of RWH in Chennai
Article about Akash Ganga Chennai in indiatogether
Chennai Metro Water Supply link about RWH
Article about Akash Ganga Chennai in raincenter.org