1. Hydropower Engineer, Dept. of Electricity Development, Ministry of Energy, Water Resource and Irrigation, P.O. Box 2507, Sanogaucharan, Kathmandu, Bagmati 44600, Nepal (corresponding author). ORCID: .
2. Assistant Professor, Dept. of International Studies, Univ. of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan.
3. Professor, Dept. of Civil Engineering, Univ. of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.