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Applying IFIM on the Gila River

Applying IFIM on the Gila River. Methods for recommending fishery flows. -Minimum flow, hydrograph -Natural flow regime -WUA-based, PHABSIM only -WUA-based, IFIM. Terminology. -IFIM vs. PHABSIM -Physical HABitat SIMulation vs. Instream Flow Incremental Methodology. PHABSIM.

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Applying IFIM on the Gila River

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  1. Applying IFIM on the Gila River

  2. Methods for recommending fishery flows • -Minimum flow, hydrograph • -Natural flow regime • -WUA-based, PHABSIM only • -WUA-based, IFIM

  3. Terminology • -IFIM vs. PHABSIM • -Physical HABitat SIMulation • vs. • Instream Flow Incremental Methodology

  4. PHABSIM • -Study sites/transects • -Microhabitat (depth/velocity/substrate, cover) • Fish habitat suitability indices (HSI) • -WUA as a function of discharge

  5. Transects and Cells

  6. Cells of depth, velocity

  7. Rectangular Representation of Depth and Velocity

  8. HSI: Depth and Velocity suitability

  9. 2D- complete coverage of a site

  10. Rainbow TroutWUA in a 2D site

  11. PHABSIM • -Mesohabitats • -Transects • -Microhabitat measurements • Depth/velocity/substrate/cover -Habitat Suitability Indices (HSI) -Weighted Usable Area (WUA)

  12. MESOHABITATS • -Pool • -Riffle • -Cascade • -Complex habitats

  13. Pool

  14. Riffle

  15. CASCADE Cascade

  16. Riffle/Pocket Water

  17. Complex habitats

  18. Survey transects

  19. Measure depths and velocities

  20. Substrate

  21. COVER

  22. (lots of cover)

  23. HSI: Fish Observations

  24. HSI- fish observations

  25. PHABSIM • Models Weighted Usable Area (WUA) • Ends at WUA

  26. WUA, 3 life stages

  27. IFIM • -A problem-solving approach • -Usually incorporates • PHABSIM • Hydrology • -Often incorporates • Temperature/water quality • Sediment • Flood flows • Special habitats

  28. IFIM • -Can incorporate many other effects • Channel change • Predation • Competition • Migration • Food base • other

  29. Streamflow at Three Sites, Summer 2002

  30. Droughts

  31. Average Minimum Flow, 1949-2001

  32. Floods (recreation flows)

  33. Special Habitats

  34. Predation

  35. Incorporating Temperature WUA (ft/1000 ft) x Total Length 1000’s of ft) x Temperature Suitability per length = Total Habitat

  36. Total Habitat Area:WUA x Temperature

  37. Flow Exceedance Scenarios

  38. i median

  39. IFIM: Drawbacks • Salmon and trout • WUA ~ Population? • Multi-species interpretation difficult • PHABSIM-only oversimplified • Data-intensive

  40. IFIM: Strengths • Accepted methodology • Incorporates many disciplines • Expertise/support available • Incremental results • Allows negotiated solutions

  41. Example issues • Is channel in equilibrium? • Water quality and temperature • Invasive species: predation/competition • Do key species migrate? • Critical habitat areas • Food base effects • Population bottlenecks • .........100 others

  42. STUDY PLAN - 1 • 1. Describe the proposed action. • 2. Describe the issues. • 3. Identify target species/resources. • 4. Select methods to address each issue. • 5. State the study objectives.

  43. STUDY PLAN - 2 • 6. Delineate study boundaries. • 7. Identify the baseline condition. • 8. Details, quality control - studies/models. • 9. Schedule, milestones, deadlines.

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