Debris Management
description
Transcript of Debris Management
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Debris Management
• Trashracks• Screen Cleaning Systems
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Trash racks - Criteria
• “Open channel intakes shall include a trash rack which shall be kept free of debris.”
• “In certain cases, a satisfactory profile bar screen can substitute for a trash rack.”
• Comment - No trashrack would be rare situation - such as an on-river screen.
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Trashracks
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Trashracks
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Trashracks
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Trashrack Spacing
• Salmon can reject passage through small bar spacing's (3”).
• Recommend no smaller than 4”, but only go this small if there is a compelling reason to do so.
• Usually 6” – 9” spacing works pretty well.• Need to carefully assess what debris may be
present.
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Trashrack Maintenance
• Install at a 1:5 (horizontal:vertical) slope (or flatter) for ease of cleaning.
• Provide easy access for cleaning.• Provide range of freedom for manipulating
debris.• Need to clean trashrack whenever head drop
exceeds a few inches, or whenever debris accumulates
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Cleaning Systems
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Main Criteria for Cleaning Systems
• Effective, reliable, proven, approved by NMFS• Head differential to initiate cleaning = 0.1 ft• Automated cleaning for most systems
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Traveling Brush Cleaning System
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Air Burst Cleaning System
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Water Jet Cleaning System
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Rotation – Vertical
Traveling Screens Cleaning System
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Rotation – Drum Screen Cleaning System
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Flow Distribution and Balancing
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Approach flow – poor conditions
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Approach flow - good conditions
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Correcting Channel Configuration – Hydraulic Modeling
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Channel Configuration – Approach Flow Conditions
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Balancing Screen Approach Velocity
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Balancing Screen Approach Velocity
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Baffles for Adjusting Approach Velocity
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Baffles for Adjusting Approach Velocity
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Swift FSC – Offset Orifice Baffle Panels
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Balancing Rotary Drum Screens
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Cylindrical Screen Without Internal Baffles
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Cylindrical Screen With Internal Baffles