1. 1) Cabinet Office : About the damage situation due to the heavy rain in July 2018 (January 9, 2019 version), http://www.bousai.go.jp/updates/h30typhoon7/pdf/310109_1700_h30typhoon7_01.pdf, 2019 (in Japanese, viewed on January 27, 2022).
2. 2) July 2018 Heavy Rain Disaster Verification Committee of Okayama Prefecture : July 2018 Heavy Rain Disaster Verification Report, pp. 1-104, http://www.pref.okayama.jp/page/574750.html, 2019 (in Japanese, viewed on January 27, 2022).
3. 3) Embankment Investigation Committee of the Oda River in the Takahashi River Basin System : 2nd Committee Handouts, http://www.cgr.mlit.go.jp/emergency/odagawateibochosa.html, 2018 (in Japanese, viewed on January 27, 2022).
4. 4) Japan Meteorological Agency : About the characteristics and factors of “heavy rain in July 2018” and record high temperature after mid-July, 2018 (in Japanese, viewed on January 27, 2022).
5. 5) Social Infrastructure Development Council of Ministry of Land, Infrastructure, Transport and Tourism : Climate change adaptation measures in the field of water disasters ~To a society that shares disaster risk information and a sense of crisis and works on disaster mitigation~, http://www.mlit.go.jp/river/shinngikai_blog/shaseishin/kasenbunkakai/shouiinkai/kikouhendou/pdf/1508_02_toushinhonbun.pdf, 2015 (in Japanese, viewed on January 27, 2022).