Here’s the release from the Bureau of Reclamation:
On November 5-8, 2018, the Department of the Interior will conduct a high-flow experimental (HFE) release from Glen Canyon Dam. This HFE will include a peak magnitude release of approximately 38,100 cubic feet per second (cfs) for 60 hours (four days including ramping from baseflows to peak release) to move accumulated sediment downstream to help rebuild beaches and sandbars. This HFE will be the first conducted under the 2016 Long-Term Experimental and Management Plan (LTEMP) HFE Protocol; similar HFEs were conducted in 2012, 2013, 2014 and 2016 in accordance with the 2011 HFE Environmental Assessment Protocol. The 2018 HFE is expected to provide resource benefits in the near term and will also provide scientific information to be used in future decision making.
This HFE will not change the total annual amount of water released from Lake Powell to Lake Mead. Releases later in the water year will be adjusted to compensate for the high volume released during this experiment.