Location
Agriculture Science Theater, Oregon State University
Start Date
27-6-2013 10:05 AM
End Date
27-6-2013 10:25 AM
Description
The North Fork Hydroelectric Development is part of the Clackamas River Hydroelectric Project in northwest Oregon, owned and operated by Portland General Electric (PGE). Design of the North Fork Floating Surface Collector (FSC) is near complete and construction should begin during the summer of 2013. The project is scheduled to be complete and operational by December of 2015. The North Fork Dam is a thin walled arch dam and it was determined that a large facility in the forebay could not be attached to the dam. Since prior studies had revealed that fish tended to congregate along the dam near the center of the forebay a fixed collector on the shore would be unlikely to attract a significant portion of the fish. This led to the choice of an FSC. This presentation will provide an overview of the overall design of the FSC, noting similarities with other FSC facilities, and focusing on the unique features of the North Fork FSC. These include passing fish directly from the FSC into a bypass pipe that delivers the fish to the tailrace of River Mill Dam downstream, as opposed to operation as a trap-and-haul facility, and the need to combine the fish with fish collected at an existing collector prior to passage downstream. This led to unique design challenges including the need for a hole to be cored through the dam to provide passage downstream from the reservoir, a section of bypass pipe that is submerged in the reservoir and allows movement of the FSC, a unique flow control facility designed to transition from full pipe flow to open channel flow, and a facility located on the bank downstream of the dam designed to combine the fish flows from both collectors and remove debris.
Concurrent Sessions D: Downstream Migrant Surface Collectors-What Works and Doesn't Work - North Fork Dam Floating Surface Collector Design
Agriculture Science Theater, Oregon State University
The North Fork Hydroelectric Development is part of the Clackamas River Hydroelectric Project in northwest Oregon, owned and operated by Portland General Electric (PGE). Design of the North Fork Floating Surface Collector (FSC) is near complete and construction should begin during the summer of 2013. The project is scheduled to be complete and operational by December of 2015. The North Fork Dam is a thin walled arch dam and it was determined that a large facility in the forebay could not be attached to the dam. Since prior studies had revealed that fish tended to congregate along the dam near the center of the forebay a fixed collector on the shore would be unlikely to attract a significant portion of the fish. This led to the choice of an FSC. This presentation will provide an overview of the overall design of the FSC, noting similarities with other FSC facilities, and focusing on the unique features of the North Fork FSC. These include passing fish directly from the FSC into a bypass pipe that delivers the fish to the tailrace of River Mill Dam downstream, as opposed to operation as a trap-and-haul facility, and the need to combine the fish with fish collected at an existing collector prior to passage downstream. This led to unique design challenges including the need for a hole to be cored through the dam to provide passage downstream from the reservoir, a section of bypass pipe that is submerged in the reservoir and allows movement of the FSC, a unique flow control facility designed to transition from full pipe flow to open channel flow, and a facility located on the bank downstream of the dam designed to combine the fish flows from both collectors and remove debris.
Comments
Mr. Christensen is a senior civil engineer and fish biologist with 26 years of experience providing fisheries science and design engineering consulting services to the hydroelectric industry and resource agencies. He has been working with Portland General Electric on a wide variety of fish passage and protection designs, both conceptual and finaldesigns, for over 12 years, and served as the technical lead design engineer on the North Fork Floating Surface Collector design.