1. Fukada Geological Institute (Former PACIFIC CONSULTANTS CO., LTD.)
2. PACIFIC CONSULTANTS CO., LTD.
3. Nikko Sabo Office, Kanto Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism
4. Public Works Research Institute
5. Sediment Control Division, Nagano prefecture
6. SABO Planning Division, SABO Department, National Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, Transport and Tourism