1. Ethiopian Institute of Water Resources, Addis Ababa, University, P.O Box 150461, Addis Ababa, Ethiopia
2. College of Science, Bahir Dar University, P.O Box 79, Bahir Dar, Ethiopia
3. College of Natural and computational Science, Addis Ababa University, Addis Ababa, Ethiopia
4. Faculty of Chemical and Food Engineering, Bahir Dar University, Bahir Dar, Ethiopia