In the Republic of Korea, XP-SWMM is mainly used to analyze the causes of urban flooding, which occurs continuously, and to establish countermeasures. However, it is difficult for a model to be calibrated because most urban areas are ungauged. Therefore, many engineers use the default values provided in the user manual when using XP-SWMM. In this study, a sensitivity analysis of the four main parameters for simulating two-dimensional inundation with XP-SWMM was conducted. In addition, the proper ranges were reviewed for the parameters by comparing the archived map of the target area (Marine City in Busan) and the simulation results that were derived from parameter changes. The results of this study can be applied in the estimation of input data for various urban inundation analyses.
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