Scientists at the city-based National Geophysical Research Institute have developed a methodology to pinpoint the ground water potential in rocky areas. A large portion of area in and around Hyderabad is hard rock terrain, and ground water is believed to be trapped in fractures of the bed rock.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/new-technique-pinpoint-ground-water-rocky-areas
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-chronicle-hyderabad
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hyderabad-d
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drainage
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources