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Professor King replying on behalf of the authors said that the drainage pattern of Uganda is virtually independent of geological structure, but shows a remarkably regular arrangement of major valleys trending E-W and herring-bone systems of tributaries comparable with an initial westward flow. In his opinion it is inconceivable that such an arrangement could have developed fortuitously by a series of captures affecting an original SE-NW drainage. Capture and other modifications of the early drainage have certainly occurred, particularly in the case of the rivers in the south and south-west, such as the Kagera and Ruizi. This can be ascribed to greater uplift and tilt and consequently an enhanced influence of structures revealed by increased erosion.
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