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Let the River Run

“Whether you instantaneously remove a structure or you take it down in stages turns out to be a huge determinant about the nature and mechanism of the downstream erosion,” says Gordon Grant, a geomorphologist at the U.S. Forest Service’s Pacific Northwest Research Station in Corvallis, Ore. “We sort of knew this, but we hadn’t really explored and understood it. How does a river get its teeth back into all this stored sediment?”

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Study finds air temperature models poor at predicting stream temps

Increases in air temperatures in the future are still likely to influence stream temperatures, but climate sensitivity of streams “is more complex than what is being realized by using air temperature-based models,” said Mohammad Safeeq, an Oregon State University researcher and co-author on the study.

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Dam Removals: Rivers on the run

Marmot had nearly 20 times more sediment and Condit had double that of Marmot. Because it would be too expensive to dig out that material and carry it away, project managers opted for a more radical approach, colourfully described as “blow and go”, in which the dams were removed quickly, says Gordon Grant, a research hydrologist at the Forest Service's Pacific Northwest Research Station in Corvallis, Oregon.