A 2024 Fall HFE

High Flow Experiment- 2024

Sediment Conditions

Fall Accounting Period

Paria River gage at Lees Ferry

• Paria input (July 1, 2021 and March 1, 2023): mt
• Accumulated in Upper Marble Canyon (July 1, 2021 and March 1, 2023, lower bound) = mt
• Accumulated in Lower Marble Canyon (July 1, 2021 and March 1, 2023, lower bound) = mt
• Available for Spring HFE: mt

HFE Transport

Upper Marble Canyon

• Paria input (April 24 - 27): mt
• Evacuated from Upper Marble Canyon (April 24 - 27, lower bound) = mt
• Evacuated from Lower Marble Canyon (April 24 - 27, lower bound) = mt
• Left over in Marble Canyon after HFE (April 24 - 27): mt

HFE Details

Schedule & Duration

Ramp Rates

• Ramp up: 4,000 cfs/hr from 6,500 - 23,100 cfs, then 3,750 cfs/hr to peak (39,500 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

Releases and Lake Elevation

Costs

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