GCDAMP- HFE 2016
SUMMARY
| High Flow Experiment- 2016 | |
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- Sediment in the system: 962,000 metric tons
- Peak CFS: 35,100 cfs
- Powerplant capacity = 20,100 cfs
- Units available: 6
- Bypass tube capacity = 15,000 cfs
- Estimated acre feet of water bypassed during HFE: 125 kaf
- November volume = 745 kaf
- Hourly Releases before and after HFE: fluctuate between 6,000 to 9,000 cfs
- Estimated costs to hydropower: $1.4 million
- Actual costs to hydropower: TBD
- Direct expenses for removal of concession assets: TBD
- Start Upramp: Nov 7, 2016
- Finish HFE: Nov 11, 2016
- Total HFE duration: 96 hrs
- HFE 2016 represents the 4th controlled high flow release conducted under the HFE Protocol.
SUPPORTING DOCUMENTS
Dear DOI Glen Canyon Leadership Team,
Please find attached for your consideration the High Flow Experiment (HFE) Technical Team's final conditional recommendation to implement a fall 2016 HFE at Glen Canyon Dam. I am pleased to report the HFE Technical Team's unanimous support of the attached report and recommendation.
In summary, the HFE Technical Team conditionally recommends that an HFE at Glen Canyon Dam be conducted beginning November 7, 2016 with a peak magnitude of approximately 36,000 cubic feet per second for 96 hours, as explained in the attached report, after 1) by Friday, October 21, GCMRC and NPS personnel confirm ammonia has provided effective treatment for green sunfish in the upper pond in Glen Canyon and 2) DOI commits to prioritizing the development and implementation of non-native species monitoring and mitigation to be in place within the next year.
The DOI Leadership Team will have a call to consider the recommendation tomorrow October 20, 2016 at 8:00 am mdt.
COMPLIANCE
CONCERNS
- Angler's concerns regarding a Fall 2016 High flow experiment
- Re-emergence of green sunfish in the -12 Mile Slough
- Increase in brown trout spawning and the increased prevalence of adult brown trout in the Lees Ferry reach since the beginning of the HFE Protocol
SEDIMENT
ADDITIONAL
