Vrushabhavathi Valley, a tributary of Arkavathi river that flows through Bengaluru, is in dire neglect.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/more-plants-needed-treat-waste-water-flowing-through-vrushabhavathi-study
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-herald-bangalore
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/karnataka
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/arkavati
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage-treatment-plants-stp