Is the flood of the Shimane Enokawa caused by heavy rainfall in the upstream Hiroshima prefecture? Ministry of Land, Infrastructure, Transport and Tourism July 14, 16:05
At the observation point in Miyoshi City, Hiroshima Prefecture, which is located upstream of Enokawa, the amount of rainfall during the 24-hour period until the dawn of 14 days was the highest since the start of the observation, and the rain that continued in the upstream gathered downstream due to the time difference and the water level suddenly rose. The flood is believed to have occurred.
According to the Ministry of Land, Infrastructure, Transport and Tourism, Enokawa is the largest river in the Chugoku region, with a total length of nearly 200 km, which flows from the mountainous area of Hiroshima prefecture and then enters Shimane prefecture and flows into the Sea of Japan in Gotsu city, Shimane prefecture.
In the upstream area, it has been raining since the 13th, and of these, at the station of the Japan Meteorological Agency located in Kimita, Miyoshi City, Hiroshima Prefecture, the highest amount of rainfall since the start of observation for 24 hours before 5 am on the 14th was 193.5. Reached millimeters.
In particular, from the early morning of the 14th, heavy rainfall of more than 20 mm per hour has fallen, and during this time, the water level of the Eno River suddenly increased at the Ozekiyama Observatory located in the upper part of the same Miyoshi City, and the flood occurred at 5 am. The dangerous water level has been exceeded.
On the other hand, at the Kabira Observatory in Gotsu City, Shimane Prefecture, which is the downstream area where flooding information was announced, no heavy rain of more than 20 mm was observed in 1 hour from the 13th, and as a result of weak rains, the flooding occurred at 7 am Information on flood occurrence was announced at 9:30 am above the dangerous water level.
There was no rainfall at this water level station during the time when the flood information was announced.
Regarding this, the Hamada River National Highway Office of the Ministry of Land, Infrastructure, Transport and Tourism said, "It is considered that the heavy rain that had fallen in the upstream Hiroshima prefecture gathered in the downstream, and the rain that had fallen in Shimane prefecture also added, causing a sudden rise in the water level." Talking