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A Preliminary Evaluation of the Potential Downstream Sediment Deposition Following the Removal of Four Dams on the Klamath River
Alternative Title
Managing Watersheds for Human and Natural Impacts: Engineering, Ecological, and Economic Challenges, EWRI and ASCE 2005 Watershed Management Conference, Williamsburg, Virginia, July 19-22, 2005
Christian Braudrick
Steve Rothert
Yantao Cui
Stillwater Sciences, Berkeley, CA
Department of Earth and Planetary Sciences, UC Berkeley
American Rivers, Nevada City, CA
Date Created and/or Issued
Contributing Institution
UC Riverside, Library, Water Resources Collections and Archives
Clearinghouse for Dam Removal Information (CDRI)
Rights Information
Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user.
Scope/Content: Abstract: Evaluation of sediment transport dynamics following dam removal usually requires extensive field data, the collection of which requires both resources and time. Certain management decisions with regard to the removal of a dam, however, may be required before the commitment of such resources. Here we present a case study and demonstrate that certain aspects of the sediment transport characteristics following dam removal can be evaluated with very limited information available. The case study in question involves J.C. Boyle, Copco, Copco II, and Iron Gate Dams on the Klamath River, California with an estimated 11.6 million cubic meters (15.2 million cubic yards) of sediment deposit. With a reconnaissance field observation and upon examination of the very limited existing field data, we determined that it is possible to evaluate the potential sediment deposition downstream of the dam following the removal of the dams under the worst-case-scenario assumptions. The evaluation was carried out with the help of DREAM-1, one of the Dam Removal Express Assessment Models developed at Stillwater Sciences, California. Results of the assessment indicate that potential sediment deposition would occur only for a brief period within a few miles downstream of the dam with a maximum thickness of sediment deposition no more than 1.2 m (4 ft).
digital copy
Sediment and channel dynamics
Dam retirement
Klamath River, CA
Copco No.1 Dam
Copco No.2 Dam
Iron Gate Dam
J.C. Boyle Dam

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