Development of initiatives that contribute to the local community and utilize for education and research
Typhoon No. 2019, which hit the Tokyo metropolitan area on October 10, 12, caused enormous damage to various places such as flooding of rivers due to record heavy rains mainly in the Kanto and southern Tohoku regions.The Tokyo City University Setagaya Campus, which is close to the Tama River, was spared the damage caused by the flooding and overflowing * of the Tama River, but was severely inundated by the inland flooding caused by the two branch rivers flowing nearby.In addition to introducing the situation, he reported on efforts to make new contributions to the community by utilizing the experience of the disaster in education and research, such as restoration activities that resumed classes in just two weeks and activities to investigate the damage situation in the surrounding area. ..
Unexpected inundation
On Saturday, October 2019, 10, Typhoon No. 12, the strongest class in the history of observation, landed in the Tokyo metropolitan area.Railway companies in the Tokyo metropolitan area have announced planned suspension from the day before, and many schools in the Kanto region have decided to close in advance.In addition, this day is also the day when entrance exams were scheduled at many universities, and Tokyo City University also announced that it will postpone the scheduled AO entrance exam to October 19th the following week, giving priority to ensuring the safety of examinees. Was.
Typhoon No. 7, which landed on the Izu Peninsula in Shizuoka Prefecture before 19:13 pm, traversed Fukushima Prefecture from the Tokyo metropolitan area without losing its power while remaining large. An extratropical cyclone off the coast of Tohoku at noon on the XNUMXth, but a large amount of record rainfall during this period caused enormous flood damage in various places.The flooding of the Abukuma River in Fukushima Prefecture was particularly enormous, but it has left scratches in various parts of the Tokyo metropolitan area, and there are areas around the Tama River, which is a major river in Tokyo, that suffered unexpected damage.One of them was the Tamazutsumi district of Setagaya Ward, where the Tokyo City University Setagaya Campus is located.
Setagaya Ward has a beautiful landscape where the city and nature are fused, with the Tama River flowing along the border with Kawasaki City in the southwest.The Tokyo City University Setagaya Campus is located on a flat land that was once carved by the Tama River, and is located in an area that symbolizes Setagaya Ward, where quiet houses are lined up.On the other hand, according to the hazard map issued by the government, if the embankment of the Tama River breaks, it is expected to be inundated by about XNUMX m.However, the Tama River, which flows through the metropolitan area and is an important living infrastructure as an urban function, has sufficient river width and embankments, so it is difficult to anticipate a catastrophic disaster.In this case as well, although there was a record heavy rainfall upstream, there was a temporary flooding of the embankment in the undeveloped area near the Futakotamagawa River, but it did not lead to a serious situation such as the collapse of the embankment.
Nevertheless, from the evening of the 12th, an incident began to occur in the Tamazutsumi district where the campus is located.A public road that crossed almost the center of the vast campus was flooded, and the water level rose sharply.It reached an estimated height of about 8 cm around 80 pm.It is probable that the water centered on the Yasawa and Maruko rivers, which are two tributaries flowing in the vicinity, overflowed because they could not join the flooded Tama river, and as a result, they gathered near the public roads of the lower campus in this area. ..Due to the phenomenon of inland water flooding, a total of 50 tons of water covered Tamazutsumi and Denenchofu 3-chome, of which about XNUMX tons flowed into the campus.In addition to flooding to the first floor in multiple buildings, the building with the basement floor becomes a space for collecting water, such as the library's basement library and learning commons, the basement floor of the classroom building, the English lounge, the secretariat floor, and research. The facilities and equipment of the building were damaged.Damage to wind and percussion instruments in the brass band's basement warehouse also amounted to millions of yen.
The area of the campus was designated as a scenic area in 1970, and is an ordinance for maintaining and preserving the beauty of nature and landscape, and the height of buildings is limited to 15 m or less.Many buildings had basements to secure space for education and research while meeting this standard, but it is said that the amount of water stored in these basements on the campus eased the spread of damage in the neighborhood. ..
On the basement floor of the library (29 floors above ground, 8 floor below ground / 3000 books), the dry area for daylighting, moisture proofing, and ventilation was the main inundation route.The library of the same university, which has a new concept that responds to changes in learning in recent years, has expanded the space for group learning as well as individual space.For this reason, books that were rented or viewed infrequently were stored underground, but the water pressure that filled the ceiling with a height of XNUMX m broke the glass of the storage, and about XNUMX books were submerged in the water. bottom.
In addition, in the building where power receiving equipment and mechanical equipment were installed on the basement floor, the entire building including the upper floors without flooding was shut down, and the campus power outage continued for more than a week.The riverbed ground was also flooded, and the nearby international student dormitories were also inundated.
