Answers

2015-12-15T20:20:23+05:30
Due to human activities like acquisition of more lands in lake or river banks especially as done in Chembarampakkam lake, the water had no way to pass through. This resulted floods in Chennai. The floods taught us Nothing stands in front of Nature.( Natural calamities)
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2015-12-18T21:03:32+05:30
While officials at the India Meteorological Department have said the exceptionally strong El Niño, along with a rare “coincidence of various factors”, has resulted in the heavy rain, there’s no denying that Chennai has failed in maintaining an effective storm water drainage system.In times when the city, and its suburbs, is being pounded with rainfall exceeding normal limits by over three times, a drainage system that isn’t functional, creeks and culverts that are blocked due to excessive dumping of garbage as well as the administration’s failure to ensure timely desilting.- See more at:
Cooum River, Adyar River and Buckingham Canal, which serve as the main rain water drain for the city, have all seen encroachments. In fact, only in September this year, the Madras High Court threatened to summon state’s chief secretary over differences in opinion between the government’s own departments. - See more at: 
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