The 2017 Fall HFE

High Flow Experiment- 2017

2017 Fall High Flow Experiment Snapshot

• A 2017 HFE was not conducted for lack of adequate sediment input from the Paria River

Sediment Conditions

Fall Accounting Period

Paria River gage at Lees Ferry

• Paria input (Jul 1 - Nov 30): 274,189
• Accumulated in Upper Marble Canyon (Jul 1 - Nov 30, lower bound) = 1,500
• Accumulated in Lower Marble Canyon (Jul 1 - Nov 30, lower bound) = 1,100
• Available for HFE: 1,500 + 1,100 = 1,600

Spring Accounting Period

Upper Marble Canyon

• Paria input (Dec 1 to Apr 1): 17,000
• Evacuated from Upper Marble Canyon (Dec 1 to Apr 1, lower bound) = -187,000
• Evacuated from Lower Marble Canyon (Dec 1 to Apr 1, lower bound) = -16,000
• Available for spring HFE: -187,000 + -16,000 = -203,000

Lower Marble Canyon

---