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Why is getting caught in a backroller near a low head so dangerous?
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What is the danger of getting caught in a backroller near a low-head dam?
It is a danger to get caught in a backroller near a low-head dam because the "backroller" is part of a recirculating current which can hold an you against the face of the dam. If you approach too near the "boil line", even from apparent safety downstream, the current may pull you in and you may never escape
Why is getting caught in a backroller near a low head dam dangerous?
Because the "backroller" is part of a recirculating current which can hold an object (you) against the face of the dam. If you approach too near the "boil line", even from apparent safety downstream, the current may pull you in (yes, pull you UPSTREAM) and you may never escape. Unwary boaters, fisherman, etc. drown in these currents every year, and many professional rescuers have lost their lives trying to save them. See http://www.paddlermagazine.com/issues/2008-3/article_321.shtml
What major hazard is created by low-head dams?
backroller at the base of the dam
Why are low head dams dangerous to boats?
Low Head dams often have tops that are below the water surface. But aside from their lack of visibility, they can create a fatal trap for small boats. Water going over a low-head dam creates a strong recirculating current (a backroller) and a turbulent upflow (a boil). These currents can push boats back against the downstream side of the dam, where the boats may capsize and their occupants may be pulled under.
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