Chikuma River Breakdown Expert Field Survey “Damage Near Flooding Assumption” October 15th, 20:00

Experts who assumed inundation conducted a field survey in Nagano, where the bank of the Chikuma River broke down due to the heavy rain of Typhoon # 19. Experts pointed out that “the damage was close to the assumption of inundation when the amount of rain fell once every 100 years. It is important to take early measures based on the assumption.”

Professor Haruhiko Yamamoto of Yamaguchi University's Faculty of Agriculture, who is familiar with river inundation assumptions, visited the Akanuma area near Hoho, Nagano city, where the bank of the Chikuma River broke down due to heavy rain of Typhoon No. 19, and the walls of buildings and apples I looked for what was left behind in the tree and investigated how high the water was.

We also confirmed the height of flooding after leaving the fence near the “Nagano Shinkansen Vehicle Center” where vehicles on the Hokuriku Shinkansen in the same Akanuma area were flooded.

As a result, the height of the water that rushed to the periphery of the vehicle center seems to have been about 3 meters and 80 centimeters, Professor Yamamoto said, “The amount of rain once every 100 years that the city issued 12 years ago. Assuming that this place will be inundated, it will be close to "more than 5 meters".

Prof. Yamamoto points out, “In a place where inundation is expected, it is important to take action such as moving in advance if there is an important asset, as well as evacuating early to protect life.” On the other hand, “The reality is that even if the local government knows the assumptions, it is difficult to accept what happens in reality. Check the assumptions of where they are and take early measures to protect their lives and property. Is important. "

Nagano City has released a hazard map that assumes the amount of rain once every 1000 years in March.