Storm Water Management Model (SWMM) is a digital hydrological model which is widely used for the simulationof rainfall-runoff processes in urban catchment. SWMM is a distributed model, which means a study urban catchmentneeds to be divided into several irregular subcatchments first before simulation. However, most of the existing subcatchmentsdivision approaches for the SWMM are not able to capture the characteristics of the spatial variability in topographyand hydro information of urban catchment. In this paper, a new subcatchment-division approach for SWMM isproposed. Two existing division method are combined together in this approach by using Geographic Information System(GIS), which can make the subcatchments fully reflect the hydrological features of the urban catchment, thus further improvethe simulation results of SWMM. The actual application results show that the SWMM using the subcatchment dividingby the approach in this paper is more reliable than other existing SWMM in urban region.
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