John Day Lock and Dam Juvenile Fish Bypass System, Columbia River, Oregon-Washington. Supplement No. 3 to General Letter Report, Transportation Conduit and Outfall.

摘要

Supplement No. 3 to the General Letter Report presents the transportation conduit and outfall features of juvenile bypass system at John Day Lock and Dam. The General Letter Report developed the basic bypass system and in place of a feature design memorandum, the following supplements will be prepared: Supplement No. 1 Supplement No. 2 Supplement No. 3 Supplement No. 4 Supplement No. 5 Submerged Traveling Screen Handling System Submerged Traveling Screens and Vertical Barrier Screens Transportation Conduit and Outfall (this report) Submerged Traveling Screen Transportation and Maintenance Facility Submerged Traveling Screen Crane The bypass system will intercept the migrating salmonids before they enter the turbines and transport them to a release point downstream of the powerhouse. The juvenile salmonids entering turbine intakes are guided upward into the forebay bulkhead slots by submerged traveling screens. Gated orifices allow the fish to pass into a transportation conduit mined through the mass concrete upstream of the bulkhead slot. The fish travel south across the powerhouse and down an outfall chute to a release point in the tailrace. Based on December 1982 price levels, the construction and design costs for the transportation conduit and outfall are $16,040,000 and construction time is 24 months with completion by 1 October 1986.