Abstract: A method of simulating the urban waterlogging process caused by rainstorm is presented. The method integrates the urban storm intensity formula in Chinese standard, the Chicago rainfall process model, the SCS (soil conservation service) runoff model by US Secretary of Agriculture, and the local isometric method based on ArcGIS. With Tangxun Lake catchment in Wuhan as a research object, the waterlogging elevation and submergence area in the presence of rainstorm of varied reoccurrence periods are obtained through simulation using the proposed method. Results reveal severe waterlogging in the Tangxun Lake catchment. Rainstorm of ten-year reoccurrence period would give rise to slight waterlogging; but the area of waterlogging does not change with the reoccurrence period of rainstorm. Rainstorm with longer reoccurrence period would cause larger submergence depth, wider submergence range, and severer impact on surrounding areas.

Key words: urban waterlogging, SCS model, GIS, rainfall, scenario simulation, submergence analysis, Tangxun Lake