暴雨站次增多，强对流天气多发，局部地区受淹积水 强降雨来袭，城市该如何应对内涝？

Core Viewpoint - The article discusses the increasing frequency of urban flooding in Sichuan and other regions due to extreme rainfall, highlighting the inadequacies of existing drainage systems and the need for comprehensive urban flood management strategies. Group 1: Causes of Urban Flooding - Urban flooding occurs when the incoming water volume exceeds the outgoing water volume, primarily influenced by heavy rainfall intensity and concentration [1] - Inadequate drainage systems, including outdated infrastructure and insufficient pipe diameters, contribute to flooding during extreme weather events [2] - River flood capacity also affects drainage efficiency; if rivers cannot discharge water effectively, it can lead to backflow into drainage systems, exacerbating flooding [2] Group 2: Urban Drainage Improvement Measures - Comprehensive measures are being implemented to enhance urban drainage, including the inspection and upgrading of drainage networks, with 29,000 kilometers inspected and 7,500 kilometers cleared as of May [3] - Real-time monitoring of drainage systems is being prioritized, with sensors installed at critical points to prevent overload situations [3] - The construction of smart drainage management platforms is underway in cities like Chengdu to improve flood response capabilities [3] Group 3: Sponge City Initiatives - The development of sponge cities is a key strategy, utilizing green infrastructure such as rain gardens and permeable surfaces to absorb rainwater and reduce surface runoff [4] - In Deyang, the implementation of ecological facilities has achieved a 60% reduction in peak flow rates, demonstrating the effectiveness of sponge city concepts [4] - Mobile drainage equipment is being pre-deployed in flood-prone areas to mitigate flooding risks, as evidenced by the operational use of mobile pumps in Chengdu [4] Group 4: Challenges in Urban Areas - Underground spaces are particularly vulnerable to flooding due to their low elevation and potential for backflow when drainage systems fail [6] - New urban areas, despite having updated drainage systems, can still experience flooding due to geographical factors and incomplete drainage connections [7] - Some regions face sewage overflow issues during heavy rainfall due to inadequate separation of stormwater and sewage systems, leading to contamination [8]