1. Africa Center of Excellence for Water Management, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
2. Faculty of Engineering and Surveying, Ndejje University, P.O. Box 7088, Kampala, Uganda
3. Department of Civil and Environmental Engineering, Waseda University, 1-104 Totsukamachi, Shinjuku-ku, Tokyo 169-8050, Japan
4. Faculty of Civil & Environmental Engineering, Jimma University, P.O. Box 378, Jimma, Ethiopia