1. Japan Meteorological Agency (JMA).
http://www.jma.go.jp/jma/menu/H29kyusyu_hokubu.html
(2017)
2. Japanese Geotechnical Society (JGS): Report of the 2017 July Northern Kyushu Torrential Rainfall Disaster.
https://www.jiban.or.jp/wp-content/uploads/2017/07/saigai_kyusyuhokubugoukinkyuhoukoku20170713.pdf
(2017) (In Japanese )
3. Yamamoto, S., Yata, J., Yano, K.: Classification of slope failure along the Otoishi River: distribution and features. In: Proceedings of the Annual Conference of Japan Society of Engineering Geology, pp. 65–74 (2017) (In Japanese)
4. Miyazaki, S.: Hydrogeological survey method. In: Booklet Hydrogeology Series 4. Senjōchi Suikankyō Kenkyū Kikō, Japan (2017) (In Japanese)
5. Kashiwagi, T.: Hydrology: research and measurement method (flow survey and hydrogeological properties of mountainous areas). In: Booklet Hydrogeology Series 3. Senjōchi Suikankyō Kenkyū Kikō, Japan (2017) (In Japanese)