Abstract:
I My sincere appreciation goes to the Nile Basin Initiative who supported
owe this achievement of mine to the Almighty Godme morally and financially through the time of my study.
From his input to this work and his continuous advice I have been greatly
encouraged.
I would like to take this opportunity to sincerely thank the supervisor
Dr.Nigussie Teklie Girma, for his guidance and advice through this work. am also very grateful to the School of Post Graduate Studies, at Arba
Minch University, for providing me material support and for creating a good working environment during the study period. My thanks also go to all Professors for the knowledge they transmitted to me. Finally, I would like to forward my thanks to my family especially my wife
Niyomwungere Feliclte who always encouraged me and friends who in one way or the other stood beside me during my study period.
