据住房和城乡建设部2010年对351个城市进行的专项调研结果显示,2008年至2010年间,全国62%的城市发生过内涝,其中57个城市的最大积水时间超过12小时。北京、广州等一线城市更是成为内涝的重灾区,2012年北京“7·21”大雨夺走了70多个生命。“雨季到城市来看海”成为流行语。发生内涝的重要原因之一是城市地面 According to a special survey conducted by the Ministry of Housing and Urban-Rural Development on 351 cities in 2010, 62% of the cities in China suffered waterlogging during 2008-2010, of which 57 cities had a maximum waterlogging time of more than 12 hours. First-tier cities such as Beijing and Guangzhou have become hardest hit by waterlogging. In 2012, the “7 · 21” heavy rain in Beijing killed over 70 lives. “Rainy season to the city to see the sea” has become a buzzword. One of the important causes of waterlogging is the urban surface