The 2019 Southwest monsoon season caused a series of floods across India from late June to early October 2019. In early July, Mumbai experienced its heaviest rainfall in a decade, resulting in flooding, while Assam experienced serious floods causing mass evacuation. In August, several areas in Maharashtra, Kerala, and Karnataka were inundated. In October, Bihar and Uttar Pradesh received heavy rain within a two-day period, resulting in extensive damage in these states.
To estimate the severity of the events AIR used a statistical approach to estimate peak discharges of rivers across India in the 2019 Southwest monsoon season, using observations from rated gauging stations, and estimated the return period of flows and their corresponding flood extents based on AIR’s India flood hazard maps.