To improve the hazard map of the inland water in the urban area, a few flooding images were given based on simulation data by NILIM2.0. Four conditions of the torrential rain had been simulated to Jakuzure district in Setagaya ward. For reliability improvement of inland water hazard map, the state of drainage function at the time of a flood has to be visualized, to offer a flood dynamic image. And administrative agency has to keep renewing the data base according to the progress on urban development. For the education of disaster prevention, the electronic media such as 3D images of flood simulations should be introduced．
