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TERMINOLOGY

TERMINOLOGY. Macrohabitat – water quality and hydrology Mesohabitat – commonly occurring habitat types Critical habitat – important to a species even if not common Microhabitat – depth, velocity and cover within each mesohabitat. PHABSIM Study. Study Planning

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TERMINOLOGY

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  1. TERMINOLOGY Macrohabitat – water quality and hydrology Mesohabitat – commonly occurring habitat types Critical habitat – important to a species even if not common Microhabitat – depth, velocity and cover within each mesohabitat

  2. PHABSIM Study • Study Planning • Locate reaches and transects • Obtain channel profile and microhabitat data • Develop hydraulic model • Input suitability rating criteria 6. Output suitability available at each flow increment of interest

  3. Hypothetical flow control issue Flow control downstream

  4. Review physical characteristics Minor tributary Flow control Repeating channel pattern: riffle/run/pool Major tributary Unique channel condition: cobble rapids downstream

  5. Link species/lifestages or guilds to specific mesohabitats

  6. Define overall study area Flow control Juvenile and adult feeding and holding Spawning bar downstream

  7. Stratify reaches according to physical, hydrologic and habitat use characteristics Flow control REACH 1 REACH 2 downstream

  8. Select study sites representative of each reach Representative reach study site Flow control REACH 1 REACH 2 Critical reach study site downstream

  9. Representative Study Site pool Sand bar riffle run

  10. Cell Boundaries are located at breaks in habitat types pool riffle run

  11. Cell Boundaries (continued) pool riffle run

  12. One transect is located within each longitudinal cell T-5 pool T-4 riffle T-3 T-2 T-1 run

  13. transect T-1 (looking downstream) headpin tailpin Top of bank Water surface Toe of bank Edge of water Thalweg

  14. Verticals are located along each transect to capture key substrate and profile features headpin tailpin Top of bank Toe of bank Edge of water Thalweg

  15. Verticals and cell boundaries act to divide each segment into a mosaic of known areas T-5 pool T-4 riffle T-3 T-2 T-1

  16. Habitat is “pixilated” into a mosaic of known dimensions

  17. Calibration flows are gathered across the flow range of interest High flow (WSL only) mid flow (WSL and velocities) low flow (WSL and some velocities)

  18. This permits interpolation and extrapolation of other flows 1,800 cfs 100 cfs

  19. Model output: Habitat-flow relationships for each river segment

  20. Suggested Problem-Solving Process Review hydrology time series Compare habitat under existing and alternate flow scenarios Compare project operation under existing and alternate flow scenarios Assess extent to which all objectives are met under each flow scenario Evaluate trade-offs Re-run alternative scenarios

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