-Editorial-SPECIAL ISSUE ON THE JULY 2020 HEAVY RAINFALL EVENT IN JAPAN

In July 2020, the Kyushu region experienced record-breaking heavy rains from July 4 to7, causing extreme floods in the Kuma and Chikugo Rivers. This was followed by atmospheric instability over a wide area from western Japan to the Tohoku region, resulting in heavy rainfall on July 13-14 in the Chugoku region, and on July 27-28 in the Tohoku region. There was also flooding of large rivers including the Go River and the Mogami River. In recent years, record-breaking torrential rainfall disasters have been occurring every year. The heavy precipitation scale has been increasing in space and time as well as in rainfall intensity, resulting in spatio-temporal expansion of the damage. Furthermore, in 2020, the disaster occurred amidst the restriction of social activities due to the COVID-19 pandemic. The compilation and dissemination of disaster survey data and lessons are essential for the sustainable development of society. Therefore, JSCE has planned a special issue on the July 2020 torrential rain disaster to share and disseminate disaster information and to contribute to the advancement of technology and science related to disaster prevention and mitigation. © 2022 Japan Society of Civil Engineers. All rights reserved.

SPECIAL ISSUE ON THE JULY 2020 HEAVY RAINFALL EVENT IN JAPAN

In July 2020, the Kyushu region experienced record-breaking heavy rains from July 4-7, causing extreme floods in the Kuma and Chikugo Rivers. This was followed by atmospheric instability over a wide area from western Japan to the Tohoku region, resulting in heavy rainfall on July 13-14 in the Chugoku region, and on July 27-28 in the Tohoku region, and flooding of large rivers including the Go River and the Mogami River. In recent years, record-breaking torrential rainfall disasters have been occurring every year, and the heavy precipitation scale as well as the rainfall intensity has been increasing in space and time, resulting in spatio-temporal expansion of the damage. Furthermore, in 2020, the disaster occurred while the social activities had been restricted due to COVID-19 pandemic. The compilation and dissemination of disaster survey data and lessons are essential toward the sustainable development of society. Therefore, JSCE has planned a special issue on the July 2020 torrential rain disaster in order to share and disseminate disaster information and to contribute to the advancement of technology and science related to disaster prevention and mitigation.抄録　令和2年7月，九州地方では4日から7日にかけて記録的な大雨となり，球磨川や筑後川では記録的な洪水が発生した．その後も西日本から東北地方の広い範囲で大気が不安定となり，江の川，最上川など大河川においても氾濫が相次いだ．近年では，毎年のように記録的な豪雨災害が発生しており，降雨強度だけでなく降雨のスケールが時空間的に大きくなっており，被害が時空間的に拡大している．さらに，令和2年度は新型コロナウィルスによる感染症対策のため，人々の活動が制限される中での災害となった．災害調査データを取り纏め，情報発信することは今後の持続可能な社会を検討する上で不可欠である．土木学会論文集では，災害情報を共有・発信し，防災に関する技術および学術分野の進展に資するために令和2年7月豪雨災害に関する特集を企画した．

FLOOD CONTROL MEASURES OF CORE MEDICAL INSTITUTION: LESSONS LEARNED FROM FLOODS IN KUMA RIVER IN 2020

Recordable heavy rainfall hit and caused severe floods from the Kuma River in Hitoyoshi and Kuma regions in July, 2020 due to an active frontal rain system. This paper aims to clarify challenges and issues in measures taken by core medical institutions against large-scale floods, which have been identified in the flood event in Kuma River in July 2020, based on the interview with the core medical institution in those regions. The paper then discusses directions for effective flood countermeasures of core medical institutions in order to have more robust Business Continuity Plan (BCP) for large-scale flood disasters.抄録　令和2年7月豪雨災害では，九州地方や東北地方などで大規模な出水となり，中でも九州地方では人的被害を含む甚大な被害が生じた．一方で，本災害は，新型コロナウイルス感染症（COVID-19）が全国的に流行する中で発生した最初の大規模水害であり，特殊な感染症への対応を継続しつつも，大規模な水害が発生した場合に地域の医療機能をどのように維持していくかが大きく問われた災害でもあった．本稿では，人吉・球磨地方における地域医療の拠点病院に対して令和2年7月豪雨災害での球磨川の氾濫に伴う浸水時の状況と対応についてヒアリングを行った結果を報告するとともに，これを踏まえた拠点医療機関の水害対策の課題と方向性について述べる．