As the level of Lake Powell rebounds with this spring's big runoff, the U.S. Bureau of Reclamation has resumed high-flow releases from Glen Canyon Dam.
on Monday opened the gates at Glen Canyon Dam allowing up to 39,500 cubic feet per second, or cfs, to pour into the river channel at Lees Ferry, sending a flood-stage surge of water through Grand Canyon. That’s like the contents of 27 Olympic swimming pools a minute spouting through the bottom of the dam.
Under a plan approved in 2012, the bureau had been conducting high-flow experiments almost annually until 2018. Since then, a string of dry years and excessive water use have depressed levels of Lake Powell, which today is onlyThat is about to change drastically in the coming weeks as the upper Colorado basin’s snowpacks, which are 157% of normal, melt and flow into Powell and upstream reservoirs. Thethis year, according to Bart Leeflang, the CRAU’s hydrologist.
“A couple years ago, we were bemoaning the fact that we had lost 2 million acre-feet from April to May [from Lake Powell],” Leeflang said. “And now you see that we picked up 2 million acre-feet in two weeks in March.” This year, the Bureau plans to increase releases from Glen Canyon Dam to 9.5 acre-feet to bring up the level of Powell’s downstream big sister, Lake Mead. That’s the maximum amount released under the dam’s operating guidelines and 2 million more than what is typically released in a year., has enabled federal river managers to resume the high-flow experiments.
Much of the water released during the experiments bypasses the dam’s eight hydroelectric turbines, but that won’t result in an increase in the amount of water released by the dam.
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