Widespread impact of 2015 flood brought people and institutions in and around Chennai together, to provide support to the flood victims. These documented case studies provides an insight into the actions undertaken by government departments, institutions, National Disaster Response Force (NDRF), civil defense, private enterprises, Community Based Organizations (CBOs) and social media during the flood incident. Understanding of their interventions and some of the challenges faced can help urban local bodies better prepare for such extreme event eventualities.