February 13, 2011

Flood Risks, Climate Change Impacts and Adaptation Benefits in Mumbai.

by Stéphane Hallegatte et al

- Managing risks from extreme events will be a crucial component of climate change adaptation. In this study, we demonstrate an approach to assess future risks and quantify the benefits of adaptation options at a city-scale, with application to flood risk in Mumbai. In 2005, Mumbai experienced unprecedented flooding, causing direct economic damages estimated at almost two billion USD and 500 fatalities. Our findings suggest that by the 2080s, in a SRES A2 scenario, an ‘upper bound’ climate scenario could see the likelihood of a 2005-like event more than double. We estimate that total losses (direct plus indirect) associated with a 1-in-100 year event could triple compared with current situation (to $690 - $1890 million USD), due to climate change alone.

Stéphane Hallegatte, Nicola Ranger, Sumana Bhattacharya, Murthy Bachu, Satya Priya, K. Dhore, Farhat Rafique, P. Mathur, Nicolas Naville, Fanny Henriet, Anand Patwardhan, K. Narayanan, Subimal Ghosh, Subhankar Karmakar, Unmesh Patnaik, Abhijat Abhayankar, Sanjib Pohit, Jan Corfee-Morlot, Celine Herweijer (2010). "Flood Risks, Climate Change Impacts and Adaptation Benefits in Mumbai. An Initial Assessment of Socio-Economic Consequences of Present and Climate Change Induced Flood Risks and of Possible Adaptation Options." OECD Environment Working Papers,
No. 27, Nov 2010.