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Pool and Chute Fishways

Pool and Chute Fishways

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Pool and Chute Fishways

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  1. Pool and Chute Fishways Presented to: Pacific Northwest Fish Screening & Passage Workshop, 2006 Yakima, WA Presented by: Patrick D. Powers P.E. September 13, 2006

  2. What is a Pool and Chute Fishway? • Hybrid type fishway that operates in two flow regimes, plunging and streaming flow

  3. Background • Carpenter Creek – Pool and Weir Fishway • Rainbow Creek – Pool and Weir Fishway • WDFW Model Study • Town Dam Pool and Chute Construction • California

  4. Pool and Chute - Definition Side Walls Baffle Baffle Weir Port Floor

  5. Pool and Chute - Cross Section W Xpc d Pb b Pw

  6. Pool and Chute – Profile – Plunging Flow H SoL Pw So L

  7. Pool and Chute – Profile – Streaming Flow d Pb So L

  8. Equations Flow over a weir Open channel flow Chezy Eq.

  9. Research on streaming/plunging flow regimes Rajaratnam, N. and Katopodis C. 1988. Plunging and Streaming Flows in Pool and Weir Fishways. Journal of Hydraulic Engineering 114:939-944

  10. Streaming/Plunging Flow Regimes Plunging Transition Streaming

  11. Streaming/Plunging Flow Regimes High Flow - Flood Streaming

  12. Streaming transition flow calculations Example: b = 2 ft L = 6 ft So = 10% Qst = 4 cfs So = 15% Qst = 6 cfs So = 20% Qst = 8 cfs

  13. Case Studies - Parameters

  14. Case Studies - Results

  15. Fairchild Trib • Q = 44 cfs • D = 1.75 ft • Qt = 5.3 cfs • Chezy C = 31.5 • Xpc = 1.2 • EDF = 2.4 • Passage Rating Fair

  16. Fairchild Creek • Q = 27 cfs • D = 1.65 ft • Qt = 5.3 cfs • Chezy C = 20.5 • Xpc = 1.6 • EDF = 2.1 • Passage Rating Good

  17. Percival Creek • Q = 24 cfs • D = 1.5 ft • Qt = 5.3 cfs • Chezy C = 22.3 • Xpc = 1.5 • EDF = 1.3 • Passage Rating Fair

  18. Fairchild Comparison – 12 Foot Wide 44 cfs: EDF = 2.4 29 cfs: EDF = 2.1

  19. Chezy C vs Qst

  20. Design Criteria • Xpc = Fish Passage Corridor - 0 to 2 ft • EDF = 2 to 3

  21. Design Process • Calculate Qfp • Select: W, baffle slope, drop, L, b, Pw • Calculate: Qst • Select d and C • Trial and error until Q = Qfp • Check: EDF, Xpc

  22. Benefits • Reduced or No false attraction (small streams) • Self cleaning (gravel/small cobbles) • Diverse passage routes for adult and juveniles • Pool sizes can be reduced

  23. Limitations • Number of weirs fishway length • Alignment • Roughness values

  24. Existing Design Guidelines • Draft in Progress - Pool and Chute Fishways • Discussion and Design Process • Revised September 11, 2001 • By: Patrick D. Powers, P.E. • Design Spreadsheet