The 2018 Fall HFE

High Flow Experiment- 2018

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:

ADDITIONAL

• AZ Central news article: Controlled flood of the Grand Canyon begins a four-day exercise on the Colorado River

---