Open problems · Cities, housing & transport
Floods and lost wetlands in south Chennai
South Chennai flooded badly in 2015 and 2023, as wetlands such as Pallikaranai marsh have been built over.
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What we know
South Chennai flooded in 2015 and 2023. Wetlands such as Pallikaranai marsh have been built over. Water supply and traffic in the IT corridor are further problems.
Open questions
- How much of Pallikaranai marsh is left today, compared with forty years ago?
- What did the flood-control works after 2015 cost, and did they help in 2023?
- Which coastal cities have restored wetlands to reduce flooding?
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