walla walla district · pacific northwest. background • endangered species / regional impacts •...
TRANSCRIPT
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WALLA WALLA DISTRICT
SURFACE BYPASS&
REMOVABLE SPILLWAY WEIRS
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INTRODUCTION
• Walla Walla DistrictSnake andColumbia RiverProjects
United States
Pacific Northwest
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BACKGROUND
• Endangered Species /Regional Impacts
• Recovery Plan Options– Dam Removals– System Improvements
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FISH PASSAGE ROUTES
• Juvenile Fish PassageMethods– Multiple Paths– Traditional Spill Currently
Favored for In-River
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TRADITIONAL FISH SPILLDRAWBACKS
• Fish Passage– Deep Spill Gates
• Water Quality– Exceeds 110% TDG
• Forgone Power– $186 Million Annually
(LCR and LSR)– $40 Million Annually
(LSR)
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SURFACE BYPASSSPILL ALTERNATIVE
• Fish Goals– Increase Passage Non-Turbine Routes– Increase Survival– Reduce Delay
• Water Quality Goals– Lower Dissolved Gas Levels
• Power Goals– Higher Revenues
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SURFACE BYPASSDEVELOPMENT
• Columbia and Snake RiverProjects– Numerous Prototypes (mid
1990’s / early 2000’s)– Lower Granite Dam
Lower Granite Dam
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LOWER GRANITEPRE-RSW DEVELOPMENT
Site Plan(1998-2000) BGS – Isometric View
Powerhouse / SBC – Side View
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LOWER GRANITE RSWDESCRIPTION
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LOWER GRANITE RSWOPERATING POSITON
Side View Isometric View
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LOWER GRANITE RSWFLOOD CONTROL POSITION
Side View Isometric View
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HYDRAULIC EVALUATIONS
Field Measurements
Numeric Models
Physical Models
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BIOLOGICAL EVALUATIONS
• Biological Methods– Radio Tracking– Hydroacoustics– Balloon Tags– Acoustic Tags / 3D
Tracking
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CORRELATION FISHBEHAVIOR / HYDRAULICS
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RSWRESULTS AND BENEFITS
• Improved Fish Passage– Highly Efficient– Less Delay– Greater Survival Potential
• Better Water Quality– 120% to 110% TDG
• Increased PowerRevenues– $13-20 Million Annual
Savings (Four LSR Dams)
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FUTURE
• Broad RegionalSupport
• Lower Granite RSWNormal Operations
• Ice Harbor RSW in2005
• High Interest forOther Projects
Ice Harbor Dam
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QUESTIONS?