Residents of Pushp Vihar have to dig 80 metres to extract water from the ground.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/water-table-dropping-fast-critical-s-delhi-areas
[2] http://admin.indiaenvironmentportal.org.in/category/author/jayashree-nandi
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-groundwater-board-cgwb
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-harvesting
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources