A prefectural committee investigating the cause of the debris flow in Atami City, Shizuoka Prefecture, published an interim report, revealing an analysis that water had flowed underground into the embankment that was the starting point of the debris flow.
Deputy Governor Namba said that the embankment was created in a place where water was likely to collect by an inappropriate construction method, which led to the collapse. "It is almost certain that the embankment was the source of the debris flow." ..
In the large-scale debris flow disaster that occurred in Atami City last July, Shizuoka Prefecture set up a verification committee to investigate the cause and released an interim report on the 29th.
According to this, it is analyzed that water flowed underground from the basin of the Naruzawa River located on the mountain side of the embankment, which was the starting point of the debris flow, to the basin of the Aizome River downstream of it, and then flowed into the embankment.
In addition, it was revealed in an interview survey by the prefecture that some companies related to the embankment testified that "water oozes from the slope of the embankment 365 days a year, and there are puddles in some places. The whole was messy." became.
Regarding this, Vice Governor Namba said at a press conference that the cause of the collapse was that water was very easy to collect and that the embankment was created by an inappropriate construction method in a place where the embankment should not be created. It is almost certain that it was the source. "
The prefectural committee wants to compile the final report by July 3, which is one year since the debris flow occurred.