Text / Technical Report: Klamath River Dam Removal Study - Sediment Transport DREAM-1 Simulation

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Title: Technical Report: Klamath River Dam Removal Study - Sediment Transport DREAM-1 Simulation
Creator: Stillwater Sciences
Date Created and/or Issued: 2008 October 01
Publication Information: Stillwater Sciences
Contributing Institution: UC Riverside, Library, Water Resources Collections and Archives
Collection: Clearinghouse for Dam Removal Information (CDRI)
Rights Information: Copyrighted
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.
Description: Scope/Content: Abstract: Iron Gate, Copco 1, Copco 2, and J.C. Boyle dams, located on the Klamath River in Oregon and California downstream of Upper Klamath Lake, are under consideration for possible removal. Data collected to date indicate that 11.5 to 15.3 million m3 (15 to 20 million cubic yards) of deposits are stored within the four reservoirs (Eilers and Gubala 2003; GEC 2006). Unlike the other mid- to large-sized dam removal projects in the U.S. (e.g., Marmot Dam on the Sandy River, Oregon; dams on the Elwha River, Washington; Matilija Dam on Ventura Creek, California; and San Clemente Dam on Carmel River, California), the deposits in the above four reservoirs on the Klamath River have a high water content (~ 80% by volume), and the majority of the sediment particles are fine-grained (i.e., in the silt and clay range), while the composition of the Klamath River channel bed downstream of these dams are cobble sized (e.g., Stillwater Sciences 2004; Cui et al. 2005; GEC 2006; Shannon and Wilson Inc. 2006). As a result, if the deposits are released downstream, high suspended sediment concentrations and their associated biological impacts due to the quick release of fine sediment will most likely be the major concern (GEC 2006), while concerns for downstream sediment deposition common to other dam removal projects will be minor, as demonstrated by the "worst-case-scenario" assumption analyses conducted in Stillwater Sciences (2004).
Scope/Content: Author affiliation: Stillwater Sciences
Type: text
Identifier: ark:/86086/n2br8rn9
951
Language: English
eng
Subject: Ecology and river restoration
Sediment and channel dynamics
Dams
Dam retirement
Place: Klamath River, CA
Klamath River, OR
Copco 1 Dam
Copco 2 Dam
Iron Gate Dam
J.C. Boyle Dam

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