1 / 27

Pool and Chute Fishways

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

deion
Download Presentation

Pool and Chute Fishways

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related