Core Viewpoint - The construction of resilient cities is essential for enhancing flood defense capabilities and adapting to extreme weather events in large urban areas like Beijing [1][7]. Group 1: Technological Empowerment in Water Management - Beijing prioritizes technological innovation, with R&D investment exceeding 6% annually, positioning it among the leading global innovative cities [2]. - The city is transitioning from experience-driven to data-driven water management, utilizing advanced technologies such as big data, cloud computing, and IoT [2]. - Projects like smart dams and digital twin systems are being implemented to enhance urban water governance [2][3]. Group 2: Flood Defense Strategies - Six major initiatives have been proposed to improve flood defense, including the establishment of flood control systems and the enhancement of water resource management [3]. - The integration of ecological and engineering approaches is recommended for effective water source protection and management [4]. - Short-term forecasting capabilities are crucial for emergency response during extreme rainfall events, with current systems able to predict flooding areas and depths effectively [5][6]. Group 3: Resilient City Framework - The increase in extreme rainfall events is attributed to global warming and local climatic conditions, necessitating the development of resilient urban infrastructures [7]. - A comprehensive drainage and flood prevention system is essential, focusing on reducing emissions at the source and improving emergency response capabilities [7]. - The promotion of sponge city concepts and the establishment of large-scale water retention spaces are vital for urban planning [7].