In 1969, the U.S. Army Corps of Engineers dewatered a section of the Niagara Falls to conduct geological studies.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...d_fullsize.jpg
Previously:
Tractor swamp draining attachment - GIF
Above ground French drain river landscaping - photo
Dam breach in China - GIF
Huge dam spillway release - GIF
Flushing silt from a dam - GIF
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