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Consequences of Damming for Ribb River and Fogera Plains, Lake Tana Basin, Ethiopia

  • 15 April, 2015
  • IHE Delft, Water Resources and Ecosystems
  • Prof.dr.M.E.McClain
  • Dr. A. Crosato

The primary effects of dams on downstream rivers are hydrological alterations, which are generally characterized by reduction of discharge peaks and increase of low flows, together with changes in their duration, occurrence period, and frequency. By blocking the movement of sediment produced in the upstream watershed, dams drastically reduce the sediment input to the downstream river. Hence, the main objective of this study is to analyze the downstream river system adaptation in response to the upstream damming, in particular, the Ribb River, Ethiopia. Ribb Dam is under construction on the Ribb River at 77 km upstream from the river mouth and a diversion weir, 30 km downstream from the dam, to irrigate 15,000 ha of the Fogera Plain, which is shared by the Ribb and the Gumara Rivers. The study combined primary and secondary data collection, and the application of remote sensing, analytical, and mathematical modeling.

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Chalachew Abebe Mulatu

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