Study on Risk Assessment of Urban Waterlogging

Risk assessment is applied to the study of urban waterlogging. A series of methods which are suitable for the risk study of urban waterlogging are presented. Based on the hydraulic model built by InfoWorks Collection System software, the situation of normal state/ pump failure under special return period is simulated. Also, the seeper depth and recoverability theory are selected as the quantitative indexes of risk consequence and calculated by the Visual Basic (VB) programs. Moreover, comprehensive decomposition analytical method combined with check list method is applied to the risk identification; the Monte Carlo method is applied to the risk estimation as well as the fuzzy comprehensive evaluation is used to the risk evaluation. Finally the risk map of specific return period is drawn to directly reflect the degree of urban waterlogging.