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随着改革开放的不断深入,城市经济得到迅猛发展,农村人口不断向城市地区集中,致使城市区域内的人口和不透水面积不断扩张,“城市化”的进程不断加快。而且绝大多数城市伴江河而立,地势平坦,又多位于季风区域,所以洪涝成为制约城市经济发展的主要灾害之一。1 城市洪涝灾害的特点1.1 城市暴雨洪水集中一般每年的6～9月份的降水量占全年的60%～80%;暴
With the continuous deepening of reform and opening up, the rapid development of urban economy and the continual concentration of rural population in urban areas led to the continuous expansion of population and impervious areas in urban areas. The process of “urbanization” has been accelerating. And most of the cities stand with rivers, flat terrain, and more in the monsoon region, so floods become one of the major constraints that restrict the economic development of cities. 1 Characteristics of Urban Flood Disaster 1.1 Concentration of Storm and Flood in Urban Area Generally, annual precipitation from June to September accounts for 60% ~ 80% of the annual total;