Reservoir completed in the basement of JR Shibuya Station Mitigating flood damage in the underground mall due to heavy rain August 19 at 18:28
k10012574221_202008191819_202008191820.mp4
A new facility has been completed in the basement of JR Shibuya Station to temporarily store rainwater from heavy rain. It is expected that the facility will be able to mitigate inundation damage in underground shopping malls by providing facilities for extremely heavy local rain.
The facility was built underground in the East Exit Square of JR Shibuya Station, where redevelopment is proceeding.
25 meters from the surface of the ground, you will find a facility called a pool, which is shaped like a pool.
The size of the part that stores water is 45 m in length, 22 m in width, 7 m in depth, and about 4000 tons of rainwater can be stored.
According to the Tokyo Sewerage Bureau, which manages the facility, there is a sewer pipe around Shibuya Station that can drain 50 mm of rain per hour, but even if it exceeds that, up to 75 mm per hour It means that it can be poured into this facility temporarily for storage.
The area covered by the facility is limited to 27 hectares on the east side of Shibuya Station, around Aoyama Street and Miyamasuzaka, but it means that it has the effect of reducing inundation of the underground shopping area of Shibuya Station.
"In recent years, heavy rain exceeding 75 mm per hour has been increasing in recent years, and the completion of the facility does not mean that we can handle any situation. I would like to promote flood control measures for the department."
Shibuya Station under the slope Tokyu Toyoko Line ticket gates also flooded
Shibuya Station is located under slopes such as Dogenzaka and Miyamasuzaka, and in the past, flooding damage to underground shopping areas has been a major issue during heavy rain, and countermeasures have been an issue.
In August 1999, a large amount of water flowed into the Tokyo Metro Hanzomon Line station yard, and in July 2015, the ticket gates on the Tokyu Toyoko Line were flooded.
Due to this damage, on the west side of Shibuya Station where Hachiko Exit etc. are located, in 2006, a kind of sewer pipe that can temporarily store 4000 tons of rainwater of the same scale as this time 2.6 m in diameter, full length Inundation measures are being taken, such as the construction of a water storage facility of about 760 meters.
The 58th pool in the 23 wards of reservoir Reservoir for 2000 cups of rainwater
In order to prevent flood damage in urban areas, the construction of facilities that store rainwater underground has advanced in recent years across the country.
Of these, in Tokyo, this is the 58th reservoir in the 23 wards that was built at Shibuya Station.
The amount of water that can be stored varies depending on the facility, but according to the Tokyo Sewer Bureau, it is possible to store about 600,000 tons of rainwater at 58 facilities and 2000 pools of rainwater at the school pool. about it.