1. a Ethiopian Institute of Water Resources, Addis Ababa University, P.O. BOX. 150461, Addis Ababa, Ethiopia
2. b College of Agriculture and Environmental Science, Arsi University, P.O. BOX. 193, Asella, Ethiopia
3. c Water and Land Resource Center, Addis Ababa University, P.O. Box 3880, Addis Ababa, Ethiopia
4. d Institute of Technology, Arba Minch University, P.O. BOX. 21, Arba Minch, Ethiopia
5. e Australian Rivers Institute, School of Engineering and Built Environment, Griffith University, Brisbane 4111, Australia