D2012-1 Top of Page
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| 1. SOR request |
SPECIFICATIONS: Beginning immediately and maintaining for duration of five days: i. Operate Powerhouse Two (PH2) at the mid-point of the 1% best efficiency range. With all available units operational, at the above operational ranges, this would be the powerhouse capacity over the next five days; any flows above this powerhouse capacity would be spilled. ii. If powerhouse capacity is reached with the above operational criteria, and spill amounts lead to TDG exceedences below Bonneville Dam, then operate Powerhouse One at Open Geometry outside of the 1% best efficiency range, while maintaining operations at Powerhouse Two at the mid-point of the of 1% range. ACTION AGENCY RESPONSE: Action Agencies (AA) indicated it would not be possible to cap PH2 at the mid-point of the 1% best efficiency range because this would result in voluntarily exceeding the gas cap. At this time the AA’s would not be able to voluntarily exceed the gas cap. However in coordination with the TMT the AA’s provided TMT with the following proposed operation that would minimize mortality at PH 2 and could be used to implement the SOR: 1. Bonneville (BON) PH2 units will be operated at the 25% of the 1% operating range. 2. To pass additional flows, operate powerhouse 1 (PH1) units up to the 100% (full capacity) of the 1% operating range. 3. To pass additional flows after PH1 is fully loaded, increase PH2 units one at a time in the order of priority within 25-50% of the 1% operating range. 4. To pass additional flow after PH1 is fully loaded and all available PH2 units are operating at 50%, increase operation of PH1 units up to best geometry. 5. To pass additional flow after all available PH1 units are operating at best geometry, increase PH2 units one at a time in the order of priority withing 50-75% of the 1% operating range. 6. To pass additional flow after all available PH2 units are operating at 75%, decrease PH1 unit operation to 100% of the 1% operating range and increase PH2 units one at a time in the order of priority within 75-100% of the 1% operating range. An additional operational adjustment implemented in an effort to minimize mortality during the Spring Creek hatchery release included changing the spill priority list. This change was coordinated during the April 11 meeting and the TMT changed the spill priority list (moving BON to the top of levels 3-7) in an effort to provide additional spill at BON. |
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| 2. Participants |
National Marine Fisheries Service, US Fish and Wildlife Service, Nez Perce Tribe, the Columbia
River Inter-Tribal Fish Commission, Washington Department of Fish and Wildlife, Idaho Fish and
Game, Oregon Department of Fish and Wildlife (ODFW not a signatory on the SOR but ODFW clarified
during the April 13 TMT meeting the lack of inclusion as a signatory was a technical error and
the intention was to be a signatory on the SOR). |
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| 3. TMT recommendation |
TMT polling below is based on the AA’s proposed operation to implement the SOR as discussed above
(Section 1. SOR Request, 1-6). TMT polling results: NOAA - Support USFW - No objection OR - No objection BOR - Support WA - No objection Colville - No objection IDFG - No objection Umatilla - No objection Nez Perce - No objection MT - No objection BPA - Support |
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| 4. AA decision | AA’s implemented the operation (Section 1. SOR Request, 1-6). | ||||
| 5. IT recommendation | |||||
| 6. AA decision (after IT) | |||||
| 7. Actual Operation |
The AA’s implemented the operation from April 13 to April 17. The operation was effective
at keeping mortality rates low at PH2 during the Spring Creek hatchery release as reflected
in the mortality rates below: 4/13 0700 hours – 4/14 0700 hours: 1,692 sampled fish; 9 mortalities; 0.5% mortality rate 4/14 0700 hours – 4/15 0700 hours: 330 sampled fish; 18 mortalities; 5.5% mortality rate 4/15 0700 hours – 4/16 0700 hours: 322 sampled fish; 8 total mortalities; 2.5% mortality rate 4/16 0700 hours – 4/17 0700 hours: 438 sampled fish; 17 mortalities; 3.9% mortality rate |
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| 8. If different from AA decision, why? | |||||