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Watson Fish Screen

Watson Fish Screen. By: Bryan Heiner. Objectives. Perform a Hydraulic and Biological Evaluation of the Watson Fish Screen. Plan View. Bypass Flow Screen

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Watson Fish Screen

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  1. Watson Fish Screen By: Bryan Heiner Clark Fork Coalition - Small-Scale Fish Screen Workshop

  2. Objectives • Perform a Hydraulic and Biological Evaluation of the Watson Fish Screen Clark Fork Coalition - Small-Scale Fish Screen Workshop

  3. Plan View Bypass Flow Screen Pipe Clark Fork Coalition - Small-Scale Fish Screen Workshop

  4. Profile View 4% Slope Clark Fork Coalition - Small-Scale Fish Screen Workshop

  5. Isometric View Clark Fork Coalition - Small-Scale Fish Screen Workshop

  6. Isometric View Clark Fork Coalition - Small-Scale Fish Screen Workshop

  7. Horizontal Screen DesignFrom: “Fish Protection at Water Diversions” (USBR 2009) • Flow Characteristics: • Uniform flow velocities through screen Clark Fork Coalition - Small-Scale Fish Screen Workshop

  8. Horizontal Screen DesignFrom: “Fish Protection at Water Diversions” (USBR 2009) • Flow Characteristics: • High sweeping velocities (> 2 ft/sec) Clark Fork Coalition - Small-Scale Fish Screen Workshop

  9. Horizontal Screen DesignFrom: “Fish Protection at Water Diversions” (USBR 2009) • Flow Characteristics: • Approach velocities that meet criteria Clark Fork Coalition - Small-Scale Fish Screen Workshop

  10. Horizontal Screen DesignFrom: “Fish Protection at Water Diversions” (USBR 2009) • Flow Characteristics: • Approach velocities that meet criteria Clark Fork Coalition - Small-Scale Fish Screen Workshop

  11. Horizontal Screen DesignFrom: “Fish Protection at Water Diversions” (USBR 2009) • Flow Characteristics: • No Hydraulic Jumps Clark Fork Coalition - Small-Scale Fish Screen Workshop

  12. Horizontal Screen DesignFrom: “Fish Protection at Water Diversions” (USBR 2009) • To achieve the requirements: • Place screen in well aligned channel • Divert 25% or less of the approach flow • Use ramps approaching and exiting the screens • Maintain adequate depth by use of tailboards or converging wall • Baffling may be necessary • Utilize valves to backwater screen Clark Fork Coalition - Small-Scale Fish Screen Workshop

  13. Horizontal Screen DesignFrom: “Fish Protection at Water Diversions” (USBR 2009) Clark Fork Coalition - Small-Scale Fish Screen Workshop

  14. Watson Screen (As Delivered) Clark Fork Coalition - Small-Scale Fish Screen Workshop

  15. Horizontal Screen DesignFrom: “Fish Protection at Water Diversions” (USBR 2009) • Approximate Flow velocities through screen About 1 ft/sec Clark Fork Coalition - Small-Scale Fish Screen Workshop

  16. Watson Screen (ReDesign) • Added a Velocity Guidance Plate Clark Fork Coalition - Small-Scale Fish Screen Workshop

  17. Watson Screen (ReDesign) • Added internal Baffles @ 2, 4 & 6ft. • Open areas of 3, 10 & 12% Clark Fork Coalition - Small-Scale Fish Screen Workshop

  18. Watson Screen (ReDesign) Clark Fork Coalition - Small-Scale Fish Screen Workshop

  19. Watson Screen (ReDesign) • More uniform velocity distribution Clark Fork Coalition - Small-Scale Fish Screen Workshop

  20. Watson Screen (ReDesign) • Sweeping vs Approach Velocity Clark Fork Coalition - Small-Scale Fish Screen Workshop

  21. Biological Results • Fish being pulled against screen (1850 GPM, no guidance plate) Clark Fork Coalition - Small-Scale Fish Screen Workshop

  22. Biological Results • Fish being pulled against screen (1850 GPM, no guidance plate) Clark Fork Coalition - Small-Scale Fish Screen Workshop

  23. Biological Results • Fish being pulled against screen (4000 GPM, no guidance plate) Clark Fork Coalition - Small-Scale Fish Screen Workshop

  24. Biological Results • Fish caught in a recirculation zone just downstream of the stop block slots (1850 GPM, no guidance plate) Clark Fork Coalition - Small-Scale Fish Screen Workshop

  25. Biological Results • Fish swimming at the transition from the guidance plate to the screen (4000 GPM, guidance plate Clark Fork Coalition - Small-Scale Fish Screen Workshop

  26. Conclusions • Remove upstream stop blocks that protrude into flow • When very little water (1/2 fish body) fish can still navigate upstream • Fish move to side of screen • Flows above 1850 GPM provide adequate water for fish to swim in water column • Pipe can take all water at flows below 1200 GPM • When this occurs fish are “high and dry” and must flop to escape eminent death. Clark Fork Coalition - Small-Scale Fish Screen Workshop

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