Abstract
The Shakujii River basin is a highly urbanized area which is located in northwest of the 23 wards of Tokyo. The drainage system with high density was constructed in this area. This basin has been suffered from flood damage twice in the last decade. In this study, we conducted numerical prediction to investigate both a process of urban inundation and flooding. As a result, inundation risk in this basin was made clear with high accuracy and high resolution. In this study, we focused on the water exchange which occurred between the drainage system and the Shakujii River. In order to realize real-time prediction of inundation, another attempt about the simplification of computation was also conducted.
