GCDAMP- HFE 2016

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High Flow Experiment- 2016
CRC 121119 0038.JPG

2016 High Flow Experiment Snapshot

  • The 2016 HFE represents the 4th controlled high flow release conducted under the HFE Protocol.
  • A preliminary analysis of these images indicates that sandbar size increased at 55% of sites, remained unchanged and 30% of sites, and decreased at 15% of sites, a response similar to those observed during each of the 2012-2014 HFEs.
  • Before and after images from the November 2016 HFE from each of the 45 sandbar sites monitored with remotely deployed digital cameras are available here.

Sediment Conditions

Fall Accounting Period
  • Paria input (Jul 1 - Nov 6): 844,748
  • Accumulated in Upper Marble Canyon (Jul 1 - Nov 6, lower bound) = 373,000
  • Accumulated in Lower Marble Canyon (Jul 1 - Nov 6, lower bound) = 72,000
  • Available for HFE: 373,000 + 72,000 = 445,000
HFE Transport
  • Paria input (Nov 7 - 12): 1,000
  • Evacuated from Upper Marble Canyon (Nov 7 - 12, lower bound) = -492,000
  • Evacuated from Lower Marble Canyon (Nov 7 - 12, lower bound) = -184,000
  • Left over in Marble Canyon after HFE (Nov 7 - 12): 445,000 + 1,000 - 492,000 - 184,000 = -230,000
Spring Accounting Period
  • Paria input (Dec 1 to Apr 1): 160,000
  • Evacuated from Upper Marble Canyon (Dec 1 to Apr 1, lower bound) = -241,000
  • Evacuated from Lower Marble Canyon (Dec 1 to Apr 1, lower bound) = -81,000
  • Available for spring HFE: -241,000 - 81,000 = -322,000

HFE Details

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: 1.15 million
  • Direct expenses for removal of concession assets: TBD

SUPPORTING DOCUMENTS

COMPLIANCE

CONCERNS

ADDITIONAL