Final comprehensive report filed by the Additional Chief Secretary/Commissioner of the Revenue Administration before the National Green Tribunal in Original Application No. 264 of 2020 (SZ) on the action taken by the Tamil Nadu government for the temporary and permanent measures to prevent recurrence of flooding and sewage overflows in the areas highlighted in the newspapers.

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The report spelt out the causes for urban flooding and proposed mitigation measures for Chennai and its peri-urban areas. The rapid urbanisation of Greater Chennai and peri-urban areas falling in Kancheepuram, Chengalpattu and Tiruvallur district has brought about change in the land use pattern and planning for proper drainage system was not done. Construction of integrated road and street side storm water drainage network in the extended area of GCC, formation of surplus channels for missing links in the river basin, formation of macro storm water drains, adopting cut and cover macro drain systems for the missing links for the surplus canals of tanks - were some of the measures suggested to contain urban flooding in Chennai and its peri-urban areas.