Flooded extensively with “inland water flooding” and “backwater” Kawasaki Oct. 18 16:04
Kawasaki City has been flooded by typhoon No. 19. It was found that inundation damage occurred one after another in a wide area of the city, and there were two phenomena that occurred due to the inundation damage, “inland flooding” and “backwater”, in different locations.
According to Kawasaki City, “inland water inundation” is a phenomenon in which drainage from the sewer to the river is not in time or backflows when heavy rain falls in the city. Inundation damage.
In Nakahara Ward, where flood damage to tower condominiums, etc. has continued, it is highly probable that there has been an “inland water flood” in which water from the Tama River flows back from the drain pipe.
On the other hand, “backwater” is a phenomenon that causes the mainstream water level to rise and makes it difficult for tributary water to flow. It is one of the phenomena that causes river flooding and bank breaks.
In Takatsu Ward, where an apartment was flooded and a man died, the “backwater” caused flooding of the Hirase River, a tributary of the Tama River, and the possibility of flowing into residential areas.
The city is investigating more closely, considering that these two phenomena occurred in different places in the city and that flood damage was a succession in a wide range.