<p>This talk will introduce our continuous research effort in developing a high-performance hydrodynamic system (i.e. High-Performance Integrated hydrodynamic Modelling Systems, or HiPIMS for short) to predict surface water flooding and other hazardous processes from intense rainfall across an entir catchment/city at unprecedented resolution. HiPIMS solves the fully 2D shallow water equations using a shock-capturing Godunov-type finite volume method. Innovative numerical methods have been developed and implemented to handle wetting and drying of very shallow overland flow over complex terrains. The model is further implemented on multiple graphics processes units (GPUs) to achieve high-performance computing, enabling high-resolution and stable simulation or forecasting of high-transient flood dynamics as well as other relevant processes across an entire city or catchment of 100s or even 1000s of km2. New modelling components have been further developed to consider the interactive human and social dynamics during a hazardous event, potentially allowing systemic risk assessment and management by taking into account dynamic vulnerability and adaptation capacity.</p>