The story began over a century ago. Between 1862 and 1872,
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/how-did-it-get-so-bad
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waterlogging
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/flood-control
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/epidemics
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kala-azar
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/insects
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/micro-organisms
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bihar