Scientists have unleashed a man-made flood in the Grand Canyon, hoping it encourages new life.
More than 117 (b) billion gallons of water from the Colorado River will be released into the canyon in a week-long experiment.
The eight-foot-wide valve was opened in the Glen Canyon Dam on Tuesday, to release more than 117 (b) billion gallons of water in one week.
Scientists hope the torrent of green water from the Colorado River will stir nutrient-rich sediment below the dam and redistribute it through the canyon.
The goal is to create hundreds of new beaches where plant life can thrive and become food for fish and animals. The test marks a shift in government focus from the dam's ability to generate power to its effects on the environment.