The U.S. Geological Survey used a drone last week to measure streamflows in the Roaring Fork and Colorado rivers. The crow-sized quadcopter buzzed 100 to 200 feet above the rivers, filming the water’s ...
Q. What is the meaning of the river and lake levels or stages on the weather page? Is it depth from the surface, or surface above sea level or what? A. It's both. "River stages" usually refers to the ...
ABOUT two years ago, I wished to know from time to time the rate at which a river was rising after a fall of rain. The river was at a considerable distance from the spot where its height was to be ...
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