Difference between revisions of "The 2018 Fall HFE"
From Glen Canyon Dam AMP
Cellsworth (Talk | contribs) |
Cellsworth (Talk | contribs) |
||
| (One intermediate revision by the same user not shown) | |||
| Line 26: | Line 26: | ||
*Evacuated from Upper Marble Canyon (Nov 5 - 10, lower bound) = -360,000 | *Evacuated from Upper Marble Canyon (Nov 5 - 10, lower bound) = -360,000 | ||
*Evacuated from Lower Marble Canyon (Nov 5 - 10, lower bound) = -160,000 | *Evacuated from Lower Marble Canyon (Nov 5 - 10, lower bound) = -160,000 | ||
| − | *Left over in Marble Canyon after HFE (Nov 5 - 10): 172,000 + 1,119 | + | *Left over in Marble Canyon after HFE (Nov 5 - 10): 172,000 + 1,119 - 360,000 - 160,000 = -346,881 |
| − | ''' | + | '''Fall Accounting Period''' [[File:2018 lower marble canyon.png|thumb|right|400px|[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09383050/09383100 '''Lower Marble Canyon'''] ]] |
*Paria input (Nov 11 to Apr 1): 366,588 | *Paria input (Nov 11 to Apr 1): 366,588 | ||
*Accumulated in Upper Marble Canyon (Dec 1 to Jun 30, lower bound) = -120,000 | *Accumulated in Upper Marble Canyon (Dec 1 to Jun 30, lower bound) = -120,000 | ||
Latest revision as of 14:58, 3 November 2022
| High Flow Experiment- 2018 | |
 |
Contents
2018 High Flow Experiment Snapshot
Sediment Conditions
Fall Accounting Period
- Paria input (Jul 1 - Nov 4): 753,000
- Accumulated in Upper Marble Canyon (Jul 1 - Oct 1, lower bound) = 240,000
- Accumulated in Lower Marble Canyon (Jul 1 - Oct 1, lower bound) = -68,000
- Available for HFE: 240,000 + -68,000 = 172,000
- Paria input (Nov 5 - 10): 1,119
- Evacuated from Upper Marble Canyon (Nov 5 - 10, lower bound) = -360,000
- Evacuated from Lower Marble Canyon (Nov 5 - 10, lower bound) = -160,000
- Left over in Marble Canyon after HFE (Nov 5 - 10): 172,000 + 1,119 - 360,000 - 160,000 = -346,881
- Paria input (Nov 11 to Apr 1): 366,588
- Accumulated in Upper Marble Canyon (Dec 1 to Jun 30, lower bound) = -120,000
- Accumulated in Lower Marble Canyon (Dec 1 to Jun 30, lower bound) = 120,000
- Available for spring HFE: -120,000 + 120,000 = 0
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. (38,100 cfs)
- 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
- Estimated acre feet of water bypassed during HFE: 81 kaf
Costs
- Estimated costs to hydropower: $923,963
- Actual costs to hydropower: $1,300,000
- Direct expenses for removal of concession assets: TBD
SUPPORTING DOCUMENTS
- Financial Analysis of Experimental Releases Conducted at Glen Canyon Dam during Water Year 2019
- Possible LTEMP Experiment: Fall 2018 HFE PPT
- 2018 High Flow Experimental Release Decision Memorandum
- Final Tech Team Report: Recommendation to Implement a Fall 2018 High Flow Experiment at Glen Canyon Dam, November 5-8, 2018
COMPLIANCE
- News Release: 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
- Grand Canyon flood fattened fish, but it's not all good news on the Colorado River
- Lighted bypass tube video
- Colorado River Pearce Ferry Rapid After High Flow Release From Glen Canyon Dam
- NPS: November 2018 High-Flow Experiment
