Despite the implementation of the underground drainage scheme sanctioned under the National River Conservation Programme (NRCP) mainly aimed at preventing the pollution of the Cauvery a decade ago,
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/demand-steps-check-sewage-flow-cauvery
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-chennai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cauvery
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drainage
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution