Abstract
Baro-Akobo River basin is one of the major contributors of the Nile River flow, which is located in the remote, largely rural southwestern part of Ethiopia. It is also one of the basins with scarce hydrological data availability. The objective of this paper is to develop regional flood frequency curves and procedure for estimation of design floods in the data scarce basin. The study facilitates estimation of design floods at ungagged locations for planning and management of water resources in the basin. Extreme value theory along with quantile-quantile plots (Q-Q plots) were utilized to construct regional curves for the basin after selecting the appropriate distribution through distribution tail analysis method. The upper Baro-Akobo basin displayed two distinct flood frequency regions: one having steep slope (Region 2) and the other flat slope (Region 1), Furthermore, the mean annual maximum flow (MAF) characteristic of the entire upper Baro-Akobo is described with one simple regression model, which relates the MAF as a function of catchment area (A). The lower Baro-Akobo basin is a flood plain region located downstream of Gambella up to Sudan border and is not suitable for construction of flood frequency curves due to significant overbank flow along the river channel system. Water resources planning in this part of the basin requires flood plain hydraulic modeling.
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