Abstract
From September 23 to 24, 2022, heavy rainfall occurred in Shizuoka Prefecture due to
Typhoon No. 15. A maximum 24-hour precipitation of 544 mm and a maximum one-hour
precipitation of 125 mm were recorded. Precipitation was particularly heavy for short periods of
time, with five of the 28 JMA stations in Shizuoka Prefecture recording one-hour precipitation
amounts and eight recording three-hour precipitation amounts exceeding their maximum values
since 1976. Three people were killed in the heavy rainfall disaster. One victim was killed by
landslides, one by flooding, and one by falling into a river. Thousands of houses were damaged,
especially in Shizuoka City, which was severely affected by the flooding. Shizuoka City
experienced a major flooding disaster in 1974, but the scale of damage this time was likely
smaller than that. In the eastern area of Shizuoka City, 76,300 households had their water cut off
when water intakes were buried by the flood, and it took nearly 10 days to restore the water
supply. All of the victims occurred in areas where flooding and sediment disaster were possible
due to the topography of the area. Flooding in Shizuoka City is also likely to be within the range
anticipated by the hazard map.
