Click the link to read the article on The Denver Post website (Bruce Finley). Here’s an excerpt:
The water gushing out of dam jets this week normally would have flowed gradually over the month of April out of Lake Powell into the river. Eventually, the water will end up in Lake Mead, the key supply for Arizona, California and Nevada. Federal officials based their recent decision to allow the simulated floods on the relatively heavy high mountain snowpack this year along headwaters of the Colorado River, which begins west of Denver near Grand Lake…
Federal hydrologists have estimated 14.7 million acre-feet of water this summer will flow from Colorado, Wyoming and Utah into Lake Powell. Since 2018, federal dam operators have declined to release water for simulated flood surges due to long-term drought and anxieties around record-low reservoir water levels, linked by scientists to climate warming and aridification of the Southwest — transformations that have left Lake Powell and Lake Mead less than a quarter full. Yet the nation’s 1992 Grand Canyon Protection Act requires efforts to ensure ecological health in the canyon, and officials established a program that includes simulated floods…
Denver Water “is supportive of the environmental flow program” in the Grand Canyon, utility manager Jim Lochhead said, lauding the effort by multiple agencies that “come together to shift water releases — not increase overall releases — in order to mimic spring hydrology through the basin, which helps to improve beaches, sandbars and aquatic habitats.”
[…]
In 1963, the construction of the Glen Canyon Dam atop the Grand Canyon disrupted essential natural processes and created Lake Powell. Sand and other sediments that for centuries moved downriver, scouring surfaces and creating beaches, suddenly were backed up on the reservoir side of that dam. And the regularized, steady flows of clear water, devoid of sediment, gradually are transforming the canyon.