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| Title | Evaluation of turbine bypass efficiency, Wells Dam |
| Author | John Skalski, Gary Johnson, Colleen Sullivan, Edward Kudera & Michael Erho |
| Date | Mar-29-1996 |
| Description | The statistical and logistical aspects of conducting a rigorous hydroacoustic assessment of fish passage at a hydroelectric project are presented. A 3-year evaluation was conducted at Wells Dam (river km 830.1 Columbia River) to estimate bypass efficiency. Wells Dam has a unique hydrocombine structure where the spillway is located directly above the turbine intakes. Baffles placed in the spill intakes create attractant flow for bypassing downstream migrant salmon smolts. Fixed-location hydroacoustic techniques coupled with finite sampling methods were used to estimate bypass efficiency at the project using 2-29 transducers located in turbine and spill intakes. Spring bypass efficiency estimates ranged from 84.3 to 95.0% with a 3-year average of 89.4% (SE 3.1%). Bypass efficiency for summer migrants varied from 76.5 to 97.0% between years with a 3-year average of 89.0% (SE 6.3%). |
| Doc | wells_turbine_bypass.pdf |
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