Good news for you lucky boaters who will be in Grand Canyon November 7-12! Here is a high flow update from the Glen Canyon Dam people, dated October 24.
At this time we anticipate that a fall HFE is highly probable. This HFE will be the fourth conducted under the Protocol. If an HFE is to occur, the timing will begin on the morning of November 7th at 6:00 AM, releases from Glen Canyon Dam will be increased up to full power plant capacity (approximately 21,000 cfs). At 9:00 AM on November 7th, bypass tubes at Glen Canyon Dam will be opened, one every hour, and releases will continue to increase up to full power plant and bypass capacity (approximately 36,000 cfs) by midday on November 7th. Releases will be maintained at peak release for 4 days (96 hours) and then begin ramping back down. Releases will return to normal operations in the early morning hours of November 12th.
The entire experiment, including ramping is expected to last nearly 5 full days.
November releases from Glen Canyon Dam prior to and after the HFE are expected to fluctuate between 6,500 cfs and 9,000 cfs. The total release in November, including the HFE, is anticipated to be approximately 744 kaf. The annual release volume from Lake Powell will not change as a result of the HFE.
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