Abstract: A typical partial section of the Jin River in Tianjin was taken as the research object in this study,and a waterlogging model was reconstructed based on urban geographic information and operational modes of drainage pipe network.Grids of river,road,sewer and community in the urban waterlogging model were partitioned by layer in order to build independent modelling systems for these grids,and then a multiple and three-dimensional urban waterlogging model with different sub-regions and layers was developed based on the established systems.The simulation results of ten rainfall events in Tianjin from 2009 to 2015 were validated using the urban seeper information and the data of river water level provided by Drainage Management Department.The results indicate that 88% of all the rainfall processes in Tianjin from 2009 to 2015 was simulated with an absolute error between the simulated and real maximum seeper depth less than 10 cm.The evolution of water level simulated by the model is consistent with the real evolution,with a statistical mean error between the simulated and measured river water level less than 10 cm and a relative error of water balance of zero.This multiple urban waterlogging model can effectively simulate the variation of river water level and urban seeper.

Key words: Urban waterlogging model, Seeper depth, Drainage radius