CNN
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Lake Powell, the second-largest human-made reservoir within the US, has misplaced practically 7% of its potential storage capability since 1963, when Glen Canyon Dam was constructed, a brand new report exhibits.
Along with water loss because of an intense multiyear drought, the US Geological Survey and the Bureau of Reclamation report discovered, Lake Powell confronted a mean annual loss in storage capability of about 33,270 acre-feet, or 11 billion gallons, per 12 months between 1963 and 2018.
That’s sufficient water to fill the Reflecting Pool on the Nationwide Mall about 1,600 occasions.
The capability of the reservoir is shrinking due to sediments flowing in from the Colorado and San Juan rivers, in keeping with the report. These sediments settle on the backside of the reservoir and reduce the entire quantity of water the reservoir can maintain.
As of Monday, Lake Powell was round 25% full, in keeping with knowledge from the Bureau of Reclamation.
It’s dangerous information for a area already dealing with water shortages and excessive wildfires as a result of drought. Nationwide Oceanic and Atmospheric Administration drought specialists mentioned final week these circumstances are anticipated to at the least proceed – if not worsen – within the coming months.
Lake Powell is a crucial reservoir within the Colorado River Basin. Each Lake Powell and close by Lake Mead, the nation’s largest reservoir, have drained at an alarming charge. In August, the federal authorities declared a water scarcity on the Colorado River for the primary time after Lake Mead’s water stage plunged to unprecedented lows, triggering obligatory water consumption cuts for states within the Southwest that started in January.
And final week, Lake Powell dipped beneath the crucial threshold of three,525 ft above sea stage, sparking extra considerations about water provide and hydropower era tens of millions of individuals within the West depend on for electrical energy.
The importance of the dwindling water provide alongside the Colorado can’t be overstated.
The system provides water for greater than 40 million folks residing throughout seven Western states and Mexico. Lakes Powell and Mead present a crucial provide of consuming water and irrigation for a lot of throughout the area, together with rural farms, ranches and native communities.
“It’s vitally vital we have now the best-available scientific info like this report to supply a transparent understanding of water availability in Lake Powell as we plan for the long run,” Tanya Trujillo, assistant secretary for water and science with the US Division of Inside, mentioned in an announcement. “The Colorado River system faces a number of challenges, together with the results of a 22-year-long drought and the elevated impacts of local weather change.”
