Arba Minch Institute of Technology, Arba Minch University, Arba Minch, Ethiopia
School of Civil and Environmental Engineering, AAiT-AAU, Addis Ababa, Ethiopia
Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway
Geophysical Institute, University of Bergen, Bergen, Norway
Copyright © 2016 Dereje Tesfahun Mengistu, Semu Ayalew Moges, Asgeir Sorteberg et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.