Abstract
From early morning to early afternoon on July 10, 2023, the activity of the Baiu-front became active and a linear precipitation zone developed, resulting in record heavy rainfall, with special heavy rainfall warnings issued for Fukuoka and Oita Prefectures. In the Hokushinkita Rainfall Observatory of the Mino Mountains, at around 9:30 a.m., when the accumulated precipitation since 0:00 a.m. on July 9 reached approximately 500 mm, a mudslide occurred in the Chinoo River flowing through the Takeno district of Tanushimaru-machi, Kurume City, located 2 km to the northwest, killing one person, seriously injuring one person, and damaging nearly 50 buildings. In the urban area of Tanushimaru-machi, the external flooding of the Kose River, a branch of the Chikugo River, and the internal flooding caused by rainwater runoff from the Mino Mountains caused damage to the Tanushimaru-machi General Branch Office, public facilities, medical institutions, stores, and homes that were flooded above and below floor level, the flooding occurred within an area designated as a flood inundation zone (Assumed Maximum Scale).
