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Debris Management

Debris Management. Trashracks Screen Cleaning Systems. 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.”

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Debris Management

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  1. Debris Management • Trashracks • Screen Cleaning Systems

  2. 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.

  3. Trashracks

  4. Trashracks

  5. Trashracks

  6. 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.

  7. 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

  8. Cleaning Systems

  9. Main Criteria for Cleaning Systems Effective, reliable, proven, approved by NMFS Head differential to initiate cleaning = 0.1 ft Automated cleaning for most systems

  10. Traveling Brush Cleaning System

  11. Air Burst Cleaning System

  12. Water Jet Cleaning System

  13. Rotation – Vertical Traveling Screens Cleaning System

  14. Rotation – Drum Screen Cleaning System

  15. Flow Distribution and Balancing

  16. Approach flow – poor conditions

  17. Approach flow - good conditions

  18. Correcting Channel Configuration – Hydraulic Modeling

  19. Channel Configuration – Approach Flow Conditions

  20. Balancing Screen Approach Velocity

  21. Balancing Screen Approach Velocity

  22. Baffles for Adjusting Approach Velocity

  23. Baffles for Adjusting Approach Velocity

  24. Swift FSC – Offset Orifice Baffle Panels

  25. Balancing Rotary Drum Screens

  26. Cylindrical Screen Without Internal Baffles

  27. Cylindrical Screen With Internal Baffles

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