1. a Africa Center of Excellence for Water Management, Addis Ababa University, Addis Ababa, Ethiopia
2. b School of Hydraulic and Water Resources, Dilla University, Dilla, Ethiopia
3. c Bahir Dar Institute of Technology, Bahir Dar University, Bahir Dar, Ethiopia
4. d Ethiopian Institute of Water Resources, Addis Ababa University, Addis Ababa, Ethiopia