1. The Japan Dam Foundation, “Dam Binran 2017,” http://damnet.or.jp/Dambinran/binran/TopIndex.html [accessed May 12, 2018]
2. River Environment Division, Water and Disaster Management Bureau, Ministry of Land, Infrastructure, Transport and Tourism, “Implementation Manual and Accompanying Commentary for the Comprehensive Inspection of Dams,” 2013.
3. Ministry of Land, Infrastructure, Transport and Tourism, “Standards for River Works: Practical Guideline for Maintenance work (Dams),” 2014 (revised in 2016).
4. Cabinet Order Concerning Structural Standards for River Administration Facilities, etc., 1976.