The 2018 Fall HFE

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High Flow Experiment- 2018
2018HFE lights.jpg

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
HFE Release Details
https://www.usbr.gov/uc/rm/gcdHFE/
  • 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

https://www.usbr.gov/uc/rm/gcdHFE/

COMPLIANCE

CONCERNS

ADDITIONAL


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