This publication describes India’s fi rst comprehensive city-level fl ood forecasting and early warning system. Located in Kolkata, the system provides forecasts and real-time updates on rainfall and inundation levels, among other climate and environmental data, thereby strengthening the city’s resilience. Since 1998, the Asian Development Bank has been supporting the Kolkata Municipal Corporation. This partnership has made Kolkata a more livable city through integrated planning and phased investments for building resilience and improving urban services.