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Hydro-Climatic Variability: A Characterisation and Trend Study of the Awash River Basin, Ethiopia

1
Environment and Rural Science, University of New England, Armidale 2351, Australia
2
Department of Agriculture, Science and Environment, Central Queensland University, Bundaberg Campus, Bundaberg QLD 4670, Australia
3
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), BP 320, West and Central Africa Regional Hub, Bamako 00223, Mali
*
Author to whom correspondence should be addressed.
Hydrology 2019, 6(2), 35; https://doi.org/10.3390/hydrology6020035
Received: 21 March 2019 / Revised: 24 April 2019 / Accepted: 25 April 2019 / Published: 27 April 2019
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Abstract

The objective of this study was to characterize, quantify and validate the variability and trends of hydro-climatic variables in the Awash River Basin (ARB) in Ethiopia using graphical and statistical methods. The rainfall and streamflow trends and their relationships were evaluated using the regression method, Mann–Kendall (MK) test and correlation analysis. The analysis focused on rainfall and streamflow collected from 28 and 18 stations, respectively. About 85.7% and 75.3% of the rainfall stations exhibited normal to moderate variability in annual and June to September rainfall, respectively, whereas 96.43% of rainfall stations showed high variability in March to May. The MK test showed that most of the significant trends in annual rainfall were decreasing except in two stations. These research findings provide valuable information on the characteristics, variability, and trend of rainfall and streamflow necessary for the design of sustainable water management strategies and to reduce the impact of droughts and floods in the ARB. View Full-Text
Keywords: Awash Basin; hydro-climate; variability; streamflow; trend Awash Basin; hydro-climate; variability; streamflow; trend
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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 (CC BY 4.0).
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Tadese, M.T.; Kumar, L.; Koech, R.; Zemadim, B. Hydro-Climatic Variability: A Characterisation and Trend Study of the Awash River Basin, Ethiopia. Hydrology 2019, 6, 35.

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