Inundation depth up to 7.2 meters or Mito Geospatial Information Authority of October 17 20:33
According to a survey by the Geospatial Information Authority of Japan, the inundation depth in Ibaraki Prefecture is estimated to have reached a maximum of 7.2 meters in Mito City where the Naka River flows and a maximum of 4 meters in Naka City where the Kuji River flows. Residents were left behind in many places in Ibaraki Prefecture, such as these areas, and were rescued by fireboats and SDF helicopters.
Naoki Shirakawa, professor at the University of Tsukuba, who specializes in river engineering, researched the site where flooding and levee breaks occurred. ”And many people think that it will be fine this time as before.”
In addition, this time, the river increased from midnight to the early morning, and it was analyzed that the evacuation was delayed due to the flooding and breaching. "If the levee break is expected at night, you must act quite early. “Even if it ends in vain, it ’s important to escape early,” he said. “We need to evacuate early.