Abstract
Development of the numerical system to reproduce runoff phenomena in a large river basin is important as tools not only to predict the disaster, but also to evaluate the complex system of water transport affected by the topography, geology, and vegetation in the basin. This study deals with the runoff by the typhoon 17, 1996 in the whole Abukuma River basin with the catchment area 5400 km2. A runoff analysis model is developed by using the kinematic wave method and channel networks. The effect of the mesh size and the distribution of Manning' sroughness are examined by comparing the observed hydro-graph at about 30 observatories.
