They meet residents living on the banks of the stream
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/tiruchi-school-children-collect-data-uyyakondan-pollution
[2] http://admin.indiaenvironmentportal.org.in/category/author/c-jaisankar
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-chennai
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tiruchirapalli-d
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waste-disposal
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution