NHK has learned that more than 13,000 homes were flooded due to Typhon Hagibis which swept across Japan over the weekend.
Data collected from NHK stations across the country showed that more than 1,000 houses were destroyed or partially damaged.
Water rose above the ground floor in 7,325 homes in 16 prefectures, including Nagano and Tochigi.
Water entered below the ground floor in 6,472 houses in 21 prefectures, such as Shizuoka and Saitama.
A total of 77 homes in seven prefectures including Chiba were half-destroyed while 1,038 homes in 21 prefectures, including Tokyo and Kanagawa, were partially damaged.