Once bountiful, Bengaluru's lakes have shrunk drastically. Statistics back this. Over the years, the city has lost 79% of its water bodies.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/bengaluru-has-lost-79-its-water-bodies-study
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-puducherry
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/karnataka
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bangalore-t
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lakes
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-conservation
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chennai-t
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/floods
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse