Inundation disasters have directly affected human?s lives such as traffic confusion and loss of life. Many current researches of urban flooding analysis have been focused on model development and representation methods based on Geographical Information Systems (GIS). We try to develop an integrated inundation analysis system using Urban Information Systems (UIS), Storm Water management Model(SWMM), and Ubiquitous Sensor Networks(USN) Systems. The developed system uses real-time inflow discharge data through sensors and geographical information of drainage devices. The system can provide road route information as well as inundated streets and zones based on UIS. Also, we develop a map viewer to integrate real-time and geographical data with drainage information, and the system provides detail inundation information according to users? location.