Location
Groningen, The Netherlands
Event Website
http://fishpassage.umass.edu/
Start Date
24-6-2015 3:00 PM
End Date
24-6-2015 3:15 PM
Description
Abstract:
The River Mill Dam Hydroelectric Development is part of the Clackamas River Hydroelectric Project in northwest Oregon, USA owned and operated by Portland General Electric (PGE). A downstream migrant fish collector and bypass facility was installed on the dam in 2012. The dam was constructed in 1911, and although a fish ladder was included at the time, and upstream passage of anadromous and resident fish has always been provided, downstream passage was only possible through the turbines or over the spillway until the collector and bypass was added. The collector is unique in that attraction water used to entice the fish into the collector is provided by the integration of one of the original five turbine/generators into the collector. This eliminates the need for pumps or the spilling of water to drive the attraction flow, and results in very costeffective operation. The majority of the attraction flow is screened away from the fish and passes directly through the turbine. The orientation of the collector entrance is also designed to work in conjunction with the powerhouse trashracks in front of the remaining four turbine/generator units to lead the fish toward the entrance. The fish bypass facilities include a sampling station that automatically sorts fish by size and a bypass pipe to the tailrace that combines smoothly at high velocity with a second bypass pipe from another dam upstream. The project has been extremely successful, and has safely collected and bypassed numbers of fish far in excess of its original design capacity in both of the first two years of operation. This presentation will provide an overview of the project, the hydraulic design involved in the unique turbine integration and fish attraction characteristics, and the impressive biological results from the initial years of operation.
Session C8: River Mill Dam Downstream Migrant Integrated Collector and Bypass
Groningen, The Netherlands
Abstract:
The River Mill Dam Hydroelectric Development is part of the Clackamas River Hydroelectric Project in northwest Oregon, USA owned and operated by Portland General Electric (PGE). A downstream migrant fish collector and bypass facility was installed on the dam in 2012. The dam was constructed in 1911, and although a fish ladder was included at the time, and upstream passage of anadromous and resident fish has always been provided, downstream passage was only possible through the turbines or over the spillway until the collector and bypass was added. The collector is unique in that attraction water used to entice the fish into the collector is provided by the integration of one of the original five turbine/generators into the collector. This eliminates the need for pumps or the spilling of water to drive the attraction flow, and results in very costeffective operation. The majority of the attraction flow is screened away from the fish and passes directly through the turbine. The orientation of the collector entrance is also designed to work in conjunction with the powerhouse trashracks in front of the remaining four turbine/generator units to lead the fish toward the entrance. The fish bypass facilities include a sampling station that automatically sorts fish by size and a bypass pipe to the tailrace that combines smoothly at high velocity with a second bypass pipe from another dam upstream. The project has been extremely successful, and has safely collected and bypassed numbers of fish far in excess of its original design capacity in both of the first two years of operation. This presentation will provide an overview of the project, the hydraulic design involved in the unique turbine integration and fish attraction characteristics, and the impressive biological results from the initial years of operation.
https://scholarworks.umass.edu/fishpassage_conference/2015/June24/17
Comments
Presenting Author Bio: Peter Christensen, PE is a senior Civil Engineer and Fish Biologist with R2 Resource Consultants in Redmond, Washington, USA. He has 30 years of experience providing engineering design and scientific research to the hydroelectric and water resource industries related to fish protection and restoration. Peter has worked closely with Portland General Electric engineers and biologists on a wide range of fish restoration design projects for the Clackamas River Hydro Project, and led the design of the River Mill Downstream Migrant Collector and Bypass from its concept development through managing the final design and providing construction support.