Abstract
In Japan, we have been severely damaged by natural disasters. Recently, the disasters caused by climate change are also expected. In order to take effective and efficient measures such as broad disaster prevention plans and business continuity plans against such natural disasters, the authors developed 'Water Supply Hazard Map' which can visualize the information of the water supply utilities and their risks, by which we can estimate impacts of disasters in each basin widely and integratedly. Furthermore, the developed 'Water Supply Hazard Map' was applied to Kino river basin and Oyodo river basin. As a result, each impact of the municipalities on water supply utilities such as water intake points, water treatment plants, and affected population could be quantitavely assessed using the indicators such as the seismic intensity levels of the earthquake and the inundation levels of tsunami flood. In addition, differences of the two basins were estimated and it turned out that the affected population in Oyodo river basin was larger and more concentrated in a few specific cities than those in Kino river basin.
