Abstract
Emergency water supply is one of the necessary operations for preventing the secondaly problems, human health and sanitary issues occurring after a huge earth quake. Therefore, the stocking volume of emergency water and the workload have to be evaluated in each city to prepare a rapid and concrete action on an emergency situation. We tried to estimate the necessary water volume on each water supply base area, which is separated by Voronoi method using GIS analysis from supplying population and supplying water volume for each person, 3L until the 3rd day after a disaster and 20L until the 20th day on each day. This research was simulated at Toyota City, Aichi. The necessary water volume for emergency will be shortage at 3 areas where the higher density of residentail land sets in 10 areas, while the enough volume is pooled in a whole city. This result suggests the city needs to prepare the opperation manual about the water that the reservoir accumulates enough distributes to a shortage area. In addition, the workload that means a number of tracks delivering water from water supply base to each evacuation center was estimated by a same method as the water volume. Under 10 tracks demands to deliver water at 70 % of a whole evacuation center in the first three days after a disaster, however, the ration decreases to 25 % after 4th day.
