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Re:‘That Girl Is Going to Get Herself Killed’ by el_nahual on Monday January 09, 2023 @10:26AM (#34311338)
Those are called "weirs", and often known as drowning machines. Practical Engineering on youtube has a great video about them: https://www.youtube.com/watch?v=YkR79oDAgOg&vl=en
Re:‘That Girl Is Going to Get Herself Killed’ by DLwdTxdU6smHQA on Monday January 09, 2023 @10:58AM (#34311783)
The same guy has a video called "The Most Dangerous Dams" [length 8:43]. It seems so be less technical and more focused on the dangerous aspects.

edit: link https://www.youtube.com/watch?v=GVDpqphHhAE