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Presentation to WALPA by Curtis DeGasperi - Foster Wheeler Tarang Khangaonkar – Foster Wheeler

A Water Quality Model of Lake Billy Chinook: Application to Issues Associated with Anadromous Fish Passage and Bull Trout. Presentation to WALPA by Curtis DeGasperi - Foster Wheeler Tarang Khangaonkar – Foster Wheeler Kevin Marshall - PGE April 13, 2000.

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Presentation to WALPA by Curtis DeGasperi - Foster Wheeler Tarang Khangaonkar – Foster Wheeler

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  1. A Water Quality Model of Lake Billy Chinook: Application to Issues Associated with Anadromous Fish Passage and Bull Trout Presentation to WALPA by Curtis DeGasperi - Foster Wheeler Tarang Khangaonkar – Foster Wheeler Kevin Marshall - PGE April 13, 2000

  2. Lake Billy Chinook (LBC)- Study Area - Columbia River Portland, Oregon Deschutes River Basin Lake Billy Chinook

  3. Lake Billy Chinook (LBC)- Study Area - Cool river runoff Warm river runoff

  4. Problem Definition • Pelton Round Butte Project – Existing Condition • Inflow from three different tributaries • Release of colder water at Round Butte • Seasonal stratification in Lake Billy Chinook (LBC) • Complex flow patterns in the reservoir • Result • Ineffective fish passage at Round Butte Dam • Modification of downstream temperature regime

  5. Objective and Modeling Approach • Primary Objective: Re-establish downstream fish passage at Round Butte Dam • Provide required downstream attraction flow • Make effective modification of reservoir flow patterns • Secondary Objective – Address project-related in-lake and downstream water quality issues • Modeling Approach - Develop the ability to simulate hydrodynamic behavior and water quality response of Lake Billy Chinook

  6. Development of BETTER Water Quality Model • Background • Water quality limited [303(d)] listing for Lake Billy Chinook for chlorophyll a and pH • Lake productivity establishes available food sources and also affects dissolved oxygen (DO) and pH levels • Objective • Develop a predictive water quality (eutrophication) model of Lake Billy Chinook

  7. Development of BETTER Water Quality Model

  8. Development of BETTER Water Quality Model • Recommend preliminary calibration to existing 1995 data • Calibrate model to match observed in-lake temperature, TSS, DO, pH, alkalinity, algal biomass, and nutrients • Apply the calibrated model to proposed Blend 13 operational modification

  9. Field Data Station Locations(1994-1997) and (January-July 1999)

  10. BETTER Model Segmentation

  11. BETTER Model GeometryDeschutes branch geometry

  12. BETTER Model Inputs • Hydrology – Tributary flow and temperature, and powerhouse withdrawal • Climatology – Air and dew point temperature, wind speed, solar radiation • Water Quality – DO, pH, alkalinity, nutrients, organic matter, algae

  13. Tributary Inflows and Rainfall1995

  14. Meteorological Inputs - 1995

  15. Water Quality Inputs Temperature 1995

  16. Water Quality InputsNutrients and Algal Biomass 1995

  17. In-Lake Water QualityAlgal Biomass and Succession 1995

  18. BETTER Model Calibration Data • Temperature • Dissolved Oxygen (DO) • pH • Algal Biomass • Turbidity • Transparency • Alkalinity • Nutrients

  19. Temperature CalibrationForebay Temperature Profiles - 1995

  20. DO CalibrationJuly 1995

  21. pH CalibrationJuly 1995

  22. Algae and Nutrients Calibration Ammonium-N Nitrate-N Ortho-P Chlorophyll a

  23. Temperature Verification – Forebay Temperature Profiles - 1999

  24. Model Alternative Studies Detail Specifications of Alternatives 1-4

  25. Development of Selective Withdrawal Alternative • Design Criteria - Compliance with temperature standards • Release of cold surface waters in winter and spring • Deeper colder water stored for release in summer • Release of surface water with deeper colder water as needed • Hydrodynamic model results indicated that surface withdrawal provides currents beneficial to fish collection

  26. Temperature CorrelationRBD and Rereg

  27. Surface/Bottom Water BlendingBlend 2: regression to Rereg temperature Percentage of Surface Water Withdrawn

  28. Surface/Bottom Water BlendingBlend 4: regression to Rereg temperature Percentage of Surface Water Withdrawn

  29. Surface/Bottom Water BlendingBlend 13: regression to Rereg temperature Percentage of Surface Water Withdrawn

  30. Blend13 vs. Existing Condition - LBC 1995 temperature Existing Blend 13 Deschutes Branch Existing Metolius Branch Crooked Branch

  31. Blend 13 vs. Existing Condition LBC Dissolved Oxygen Existing Condition – Forebay Time Series Blend 13 – Forebay Time Series

  32. Blend 13 vs. Existing Condition LBC pH Existing Condition – Forebay Time Series Blend 13 – Forebay Time Series

  33. Summary and Conclusions • Temperature calibration/verification complete • Preliminary water quality calibration complete • Model Application to Blend 13 Selective Withdrawal run • Increase in in-lake and discharged DO • Improves in-lake and downstream temperatures • Small increase in pH • Proposed model improvements • Sampling to define tributary BOD and detritus loads

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