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Hood River Tributaries

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  1. Hood River Tributaries Draft area Weighted Suitability Presented by: Thomas Gast, Normandeau Associates Presented to: Hood River Water Planning Group Instream Flow Subcommittee June17, 2013

  2. Area Weighted Suitability AWS = WUA – weighted useable area An index of suitable physical habitat availability NOT an actual area Presented as a relationship to flow Calculated from each sample point (station) along study transects What is it?

  3. Area Weighted Suitability The index of suitability of each station component is multiplied together and weighted by the area it represents • Habitat Suitability Criteria (HSC) applied to: How is it calculated?

  4. Area Weighted Suitability AWS is determined from: • Depth suitability • Velocity suitability • Attribute (substrate/cover) suitability Weighted by stream area represented What does it mean? • AWS does not include • Temperature • Dissolved Oxygen • Suspended Sediment • Or anything else (flow availability!)

  5. Area Weighted Suitability Use a historic flow time series record Compare alternatives • How does each alternative alter habitat availability for each species/life-stage? Limit frequency and extent of low values Balance competing life-stages and use of water Consider management strategies How do you use it?

  6. Habitat Time Series Analysis • A time period is selected which corresponds to a species’ life stage of interest. The time period here is July-December for Spawning Chinook Salmon. For this example, day 123 (October 31) is selected for the example. • The flow corresponding to day 123 is 246 cfs on this hydrograph. HABITAT INDEX • The habitat index that corresponds to 246 cfs is found on the Chinook Salmon Spawing AWS curve at ~ 25000.

  7. Habitat Time Series Analysis • The Habitat Index of 25000 corresponding to day 123 is plotted to develop a Habitat Index Time Series. • To complete the Habitat Index Time Series, all the remaining days and corresponding habitat index are plotted.

  8. HABITAT Time series Analysis In the previous example, one streamflow time series was considered and in the Water Planning Study, a different streamflow time series will be generated for each of the 32 alternatives at each IFIM reach. To evaluate the Habitat Suitability for each of these alternatives the following steps will be completed: • The Habitat Time Series will be rearranged by probability of exceedance, similarly to a Flow Duration Curve, where Habitat Index values replace flow. • The “Habitat Duration Curve” will then be generated for each of the 32 alternatives. • The alternative with highest cumulative habitat index is more favorable to the species during the period selected.  

  9. East Fork Hood River Lower Site

  10. East Fork Hood River Lower Site

  11. East Fork Hood River Lower Site

  12. East Fork Hood River Lower Site

  13. East Fork Hood River Upper Site

  14. East Fork Hood River Upper Site

  15. East Fork Hood River Upper Site

  16. East Fork Hood River Upper Site

  17. West Fork Hood River

  18. West Fork Hood River

  19. West Fork Hood River

  20. West Fork Hood River

  21. West Fork Hood River

  22. Green Point Creek

  23. Green Point Creek

  24. Green Point Creek

  25. Green Point Creek

  26. Neal Creek

  27. Neal Creek

  28. Neal Creek