Abstract: The risk assessment map for urban waterlogging is the basic technical data for disaster prevention and mitigation in urban areas. Using basic geographic data as urban pipe networks, after watershed division and pipe network generalization and parameter rate, Xiamen waterlogging model was established. The depth of surface gathered water in Xiamen Island under the rainfall of different return period was also simulated and was viewed as hazard assessment factor in risk assessment of waterlogging disasters. Furthermore, the river network influence, sensitive point density and vegetation coverage constitute the sensitivity factors of hazard inducing environment; and population density and per capita GDP compose the vulnerability assessment factors of disaster body. Based on such factors, the risk assessment model for the waterlogging disaster of Xiamen Island is established, and waterlogging disaster risk level evaluation map at different return periods is generated. The results show that: With the increase of the return period, the area of high-risk index is gradually increasing, mainly showing the trend of expansion from coastal to island. Some areas exhibit stable low-risk characteristics due to the influence of the underlying surface such as the mountain and water system.

Key words: urban waterlogging, SWMM, return period, risk assessment