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Water Resources Center Archives, University of California, Berkeley, staunchly assisted with literature searches.
Yirga Mulat generously provided technical assistance and warmly hosted Worku Legesse during his stay in the United States. Worku Legesse also would like to thank his wife, Haimanot Temesgen, for her steadfast support during his stay in the United States.
Lastly, we are grateful to Lester Bradford for critically reading the manuscript and the staff of Cambria Press for their creativity and resourcefulness during the editorial process.