I'm proud that you are looking for a solution, a better infrastructure in the metro-politician coastal city that would retain with minimal loss during Disasters caused by extreme weather events on Equatorial buffer zone.

I agree there are lot of mishaps and illegal land occupation and improper planning of the city led to maximum destructions and havoc to people dwelling in this region. 

please check the following link.

https://en.wikipedia.org/wiki/Chennai_Metropolitan_Development_Authority

Meanwhile I will also en-quire with local friends to add information to your works.

dear arun, 

thank you for your quick response and your help. 

Kilian,

I'm not sure whether you are familiar with the Disasters Charter or not.

Following last year's floods, several flood maps were derived from satellite data and can be downloaded from: https://disasterscharter.org/web/guest/-/other-in-india

I assume these maps might be useful for your study, however if you are familiar with the Charter please ignore this note.  Good luck.

dear Ramesh,

thank you very much, I havn't been familiar with this page. I checked it out and it is more than useful.

best  regards