很多人认为,中国城市落后的地下排水系统,是逢雨必涝的罪魁祸首,中国青年报最近的一项有关内涝的调查显示,83.8%的人认为国内城市频发内涝原因在于“很多城市的建设重地表,轻地下”。我国大多数城市存在每年雨量分布不均,一年在夏季四个月的雨量都在全年雨量的70%以上,而其他月份又降水量偏低。例如:南宁市近些年的平均降水量在1298mm,每年的4~9月份是降雨的高峰期,能够达到1032mm,占了 Many people think that the underdeveloped underground drainage system in China’s cities is the culprit in every rainstorm. A recent survey by China Youth Daily on waterlogging shows that 83.8% of the people think the reason for frequent domestic waterlogging lies in the fact that many cities The construction of the surface, light underground ". In most of China’s cities, there is an uneven distribution of annual rainfall. In one year, the rainfall in the four months of summer is more than 70% of the annual rainfall, while the precipitation in other months is low. For example: Nanning City in recent years the average rainfall at 1298mm, 4 to September each year is the peak rainfall, to reach 1032mm, accounting for