Difference between revisions of "GCDAMP- HFE 2016"
From Glen Canyon Dam AMP
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== CONCERNS == | == CONCERNS == | ||
| + | *[[Media:20171219 GCPBA HFE comments.pdf| Grand Canyon Private Boater's Association (GCPBA) letter requesting '''slower downramp rates''' following the Fall 2016 High flow experiment.]] | ||
*[[Media:Katrina 2016 HFE final 10-13-16.pdf| '''Angler's concerns regarding a Fall 2016 High flow experiment''']] on foodbase, trout condition, and disbursement of green sunfish. Also, noted that a comprehensive written three year review of the first three HFEs has not been provided yet. | *[[Media:Katrina 2016 HFE final 10-13-16.pdf| '''Angler's concerns regarding a Fall 2016 High flow experiment''']] on foodbase, trout condition, and disbursement of green sunfish. Also, noted that a comprehensive written three year review of the first three HFEs has not been provided yet. | ||
| − | |||
*Re-emergence of [http://gcdamp.com/index.php?title=Green_Sunfish_Page '''green sunfish'''] in the -12 Mile Slough. | *Re-emergence of [http://gcdamp.com/index.php?title=Green_Sunfish_Page '''green sunfish'''] in the -12 Mile Slough. | ||
*Increase in [http://gcdamp.com/index.php?title=Brown_Trout '''brown trout'''] spawning and the increased prevalence of adult brown trout in the Lees Ferry reach since the beginning of the HFE Protocol. | *Increase in [http://gcdamp.com/index.php?title=Brown_Trout '''brown trout'''] spawning and the increased prevalence of adult brown trout in the Lees Ferry reach since the beginning of the HFE Protocol. | ||
Revision as of 14:48, 14 March 2017
| High Flow Experiment- 2016 | |
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Contents
2016 High Flow Experiment Snapshot
- The 2016 HFE represents the 4th controlled high flow release conducted under the HFE Protocol.
Schedule & Duration
- Nov. 7 - 6 a.m. begin upramp to powerplant capacity ( ~21,000 cfs)
- Nov. 7 - 10:00 a.m. open bypass tubes, reach full bypass at 12:00 p.m.
- Nov. 11 - 12:00 p.m. end of bypass
- Nov. 12 - 3:00 a.m. end of HFE
- Total duration: 5 days & 5 hours (96 hours at peak release)
Ramp Rates
- Ramp up: 4,000 cfs/hr from 6,500 - 21,000 cfs, then 3,750 cfs/hr to peak (36,000 cfs)
- Ramp down: 1,875 cfs/hr from 36,000 - 21,000 cfs, then 1,500 cfs/hr to 9,000 cfs
HFE Release Details
- Maximum total release: 36,000 cfs
- Powerplant capacity: 21,000 cfs
- River outlet tubes: 15,000 cfs
- Hydropower generation units available: 6
- River outlet tubes: 4
Releases and Lake Elevation
- Releases will range from 6,500 - 9,000 cfs prior to and after the HFE
- Lake elevation is projected to decrease by approximately 2.5 feet during the 5-day period
- Estimated acre feet of water bypassed during HFE: 125 kaf
- November volume = 745 kaf
Costs
- Estimated costs to hydropower: $1.4 million
- Actual costs to hydropower: TBD
- Direct expenses for removal of concession assets: TBD
SUPPORTING DOCUMENTS
- Fall 2016 HFE Planning
- Technical Team Memo: Final Recommendation to Implement a Fall 2016 High Flow Experiment at Glen Canyon Dam
- Leadership Team Memo: Approval of Recommendation for Experimental High-Flow release from Glen Canyon Dam, November 7-12, 2016
COMPLIANCE
CONCERNS
- Grand Canyon Private Boater's Association (GCPBA) letter requesting slower downramp rates following the Fall 2016 High flow experiment.
- Angler's concerns regarding a Fall 2016 High flow experiment on foodbase, trout condition, and disbursement of green sunfish. Also, noted that a comprehensive written three year review of the first three HFEs has not been provided yet.
- 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
- Sediment in the system: 962,000 metric tons
ADDITIONAL
