Data | Why does Chennai get flooded even after a single spell?

From urbanisation to missing links of stormwater drains, the maps tell it all.

November 30, 2021 01:29 pm | Updated 08:20 pm IST

A view of an empty plot of land filled with rain water in Thazhambur

A view of an empty plot of land filled with rain water in Thazhambur

Every rainy season, Chennai is flooded. Some of its streets get inundated even after a single spell. The maps show that as the need for residential units grew, houses were built in low-lying areas and floodplains, leading to stagnation. The loss of a portion of the Pallikaranai marshland added to the crisis. Moreover, many missing links of stormwater drains, even along major roads, led to frequent stagnation.

Flat terrain

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Chennai lies in a relatively flatter terrain and is close to sea level in most places. Some localities are in relatively low-lying areas, so the water doesn't get drained quickly, leading to flooded streets

Land of lakes