Die Wasserkrise in Chennai wurde in 200 Bezirken kartiert – kein einziger Fluss erfüllt die Standards für sichere Wasserqualität [OC]

I combined data from 6 Indian government sources to map Chennai’s (Tamil Nadu, India) water situation at the ward level:

* CMWSSB (reservoir storage)
* CGWB/OpenCity (groundwater depth)
* CPCB (river water quality)
* GCC CFLOWS (flood hazard zones)
* GCC (storm water drainage)
* CMWSSB (sewerage infrastructure)

1,635 water bodies mapped. 14 wards face both groundwater stress and high flood risk. All four rivers – Cooum, Adyar, Kosasthalaiyar, Otteri Nullah – exceed safe pollution limits.

Tools: Next.js, Python, Leaflet, Claude (AI narratives)

Interactive version: [neervazhvu.org](http://neervazhvu.org)
Source code: [github.com/SundareshPrasanna/neer-vazhvu](http://github.com/SundareshPrasanna/neer-vazhvu)

„shocking news“ nobody could forsee considering how they treat the rivers.