1. Watson Fish Screen By: Bryan Heiner August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

2. Objectives
Perform a Hydraulic and Biological Evaluation of the Watson Fish Screen
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

3. Plan View Bypass Flow Screen Pipe August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

4. Profile View 4% Slope August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

5. Isometric View
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

6. Isometric View
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

7. Horizontal Screen Design From: “Fish Protection at Water Diversions” (USBR 2009)
Flow Characteristics:
Uniform flow velocities through screen
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

8. Horizontal Screen Design From: “Fish Protection at Water Diversions” (USBR 2009)
Flow Characteristics:
High sweeping velocities (> 2 ft/sec)
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

9. Horizontal Screen Design From: “Fish Protection at Water Diversions” (USBR 2009)
Flow Characteristics:
Approach velocities that meet criteria
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

10. Horizontal Screen Design From: “Fish Protection at Water Diversions” (USBR 2009)
Flow Characteristics:
Approach velocities that meet criteria
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

11. Horizontal Screen Design From: “Fish Protection at Water Diversions” (USBR 2009)
Flow Characteristics:
No Hydraulic Jumps
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

12. Horizontal Screen Design From: “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
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

13. Horizontal Screen Design From: “Fish Protection at Water Diversions” (USBR 2009)
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

14. Watson Screen (As Delivered)
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

15. Horizontal Screen Design From: “Fish Protection at Water Diversions” (USBR 2009)
Approximate Flow velocities through screen
About 1 ft/sec
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

16. Watson Screen (ReDesign)
Added a Velocity Guidance Plate
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

17. Watson Screen (ReDesign)
Added internal 2, 4 & 6ft.
Open areas of 3, 10 & 12%
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

18. Watson Screen (ReDesign)
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

19. Watson Screen (ReDesign)
More uniform velocity distribution
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

20. Watson Screen (ReDesign)
Sweeping vs Approach Velocity
Qin
Qpipe
Qout
Approach Velocites (Qpipe/ScreenArea)
Sweeping Velocity at 0.00 ft (Upstream End)
Sweeping Velocity at 7.5 ft (Downstream end)
GPM
ft/sec
966
885 80
0.094
2.582
2.15
1,288
893
394
0.095
2.810
4.69
1,610
716
3.020
5.47
1,931
1,038
3.130
6.17
2,286
895
1,391
3.303
6.20
2,575
1,680
3.359
6.42
2,897
900
1,997
3.405
6.68
3,235
903
2,332
0.096
3.604
6.74
3,525
906
2,619
3.696
6.67
3,863
909
2,954
3.756
6.87
4,153
914
3,238
0.097
3.828
7.22
4,523
917
3,605
3.721
6.89
4,796
919
3,877
0.098
3.772
7.40
5,151
921
4,230
3.934
7.07
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

21. Biological Results
Fish being pulled against screen (1850 GPM, no guidance plate)
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

22. Biological Results
Fish being pulled against screen (1850 GPM, no guidance plate)
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop

23. Biological Results
Fish being pulled against screen (4000 GPM, no guidance plate)
August 2014
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)
August 2014
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
August 2014
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.
August 2014
Clark Fork Coalition - Small-Scale Fish Screen Workshop