1) Flood risk modelling and assessment involves using 1D, 2D, and 3D approaches to model flooding at different scales from sewer and overland flow to large domains and uncertainty analysis. 2) Flood modelling at city scale is important for understanding flood risk and developing resilient strategies, taking into account factors like urban growth, climate change, and health impacts. 3) Flood impact assessment requires a unified framework to evaluate impacts on critical infrastructure, transportation disruptions, and cascading effects across interconnected systems as well as developing and assessing resilient strategies.