【命题背景】近几年,我国一些大中城市频繁发生“雨后看海”事件,城市内涝给人们生产生活、城市发展带来了安全威胁和较大的经济损失。城市建设脚步加快的同时,对原始自然系统的扰乱也在加速:城市地表由原来的土地变成钢筋混凝土及柏油路,导致雨水不能深入地下,只能通过排水系统排走,遇到暴雨天气时,易 Proposition Background In recent years, some large and medium-sized cities in our country have frequent occurrences of events such as “looking after the sea after a rainstorm”, urban waterlogging giving birth to people’s livelihood, and urban development that posed a security threat and a large economic loss. As urban construction accelerates, disruption of the original natural system is also accelerating: the surface of urban land from the original land into reinforced concrete and asphalt road, leading to rain can not penetrate underground, drainage through the drainage system only, in case of heavy rain ,easy