Difference between revisions of "The 2018 Fall HFE"
From Glen Canyon Dam AMP
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*Direct expenses for removal of concession assets: '''TBD''' | *Direct expenses for removal of concession assets: '''TBD''' | ||
| − | == SUPPORTING DOCUMENTS == [[File:2018HFE_traveltime.jpg|thumb|right|400px|https://www.usbr.gov/uc/rm/gcdHFE/]] | + | == SUPPORTING DOCUMENTS == |
| + | [[File:2018HFE_traveltime.jpg|thumb|right|400px|https://www.usbr.gov/uc/rm/gcdHFE/]] | ||
*[https://www.usbr.gov/uc/rm/gcdHFE/pdfs/20181018%20DOI%20HFE%20Decision%20Memo_ASWS%20Signed_with%20attachments.pdf 2018 High Flow Experimental Release Decision Memorandum] | *[https://www.usbr.gov/uc/rm/gcdHFE/pdfs/20181018%20DOI%20HFE%20Decision%20Memo_ASWS%20Signed_with%20attachments.pdf 2018 High Flow Experimental Release Decision Memorandum] | ||
Revision as of 12:54, 19 November 2018
| High Flow Experiment- 2018 | |
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Contents
2018 High Flow Experiment Snapshot
Sediment Conditions
Fall Accounting Period
- Paria input (Jul 1 - Sept 21): 709,000
- Accumulated in Upper Marble Canyon (Jul 1 - Sept 4, lower bound) = 238,000
- Accumulated in Lower Marble Canyon (Jul 1 - Sept 4, lower bound) = 84,000
- Available for HFE: 238,000 + 84,000 = 322,000
HFE Transport
- Paria input (Nov 5 - 10):
- Evacuated from Upper Marble Canyon (Nov 5 - 10, lower bound) =
- Evacuated from Lower Marble Canyon (Nov 5 - 10, lower bound) =
- Left over in Marble Canyon after HFE (Nov 5 - 10):
Winter Accounting Period
- Paria input (Nov 11 to Apr 1):
- Evacuated from Upper Marble Canyon (Dec 1 to Apr 1, lower bound) =
- Evacuated from Lower Marble Canyon (Dec 1 to Apr 1, lower bound) =
- Available for spring HFE:
HFE Details
Schedule & Duration
- Nov. 5 - 6:00 a.m. begin upramp to powerplant capacity (~23,100 cfs) [7 generation units]
- Nov. 5 - 11:00 a.m. open bypass tubes, reach full bypass at 2:00 p.m.
- Nov. 8 - 9:00 a.m. end of bypass
- Nov. 8 - 3:00 p.m. end of High Flow Experiment
- Total duration: 3 days & 10 hours; 2 ½ days at peak release (60 hours)
Ramp Rates
- Ramp up: 4,000 cfs/hr from 6,500 - 23,100 cfs, then 3,750 cfs/hr to peak (38,100 cfs)
- Ramp down: 1,875 cfs/hr from 38,100 – 23,100 cfs, then 2,500 cfs/hr to 9,000 cfs
- Maximum total release: 38,100 cfs
- Powerplant capacity: 23,100 cfs
- River outlet tubes: 15,000 cfs
- Hydropower generation units available: 7 (one unit off-line for replacement)
- 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 7 inches during the 3-day experiment
Costs
- Estimated costs to hydropower: TBD
- Actual costs to hydropower: TBD
- Direct expenses for removal of concession assets: TBD
SUPPORTING DOCUMENTS
COMPLIANCE
- Interior Initiates High-Flow Experiment at Glen Canyon Dam
- Media Advisory: High-Flow Experiment at Glen Canyon Dam
CONCERNS
ADDITIONAL
- AZ Central news article: Controlled flood of the Grand Canyon begins a four-day exercise on the Colorado River
- Lighted bypass tube video
- Colorado River Pearce Ferry Rapid After High Flow Release From Glen Canyon Dam
