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#32
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07-14-2022, 12:40 AM
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| My Rank: LANCE CORPORAL Poster Rank:3387 Join Date: Aug 2009 Posts: 105 Mentioned: 0 Post(s) Quoted: 43 Post(s)
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Re: Water Rescue Ends Badly
There's another term for this effect, drowning machines. Very brief description...I'm a biologist, not a hydrologist. What happens is that you have moving water falling into another pool of water. The direction of flow causes the faster moving water to flow along the bottom of the stream. When it reaches the bottom of the new section, it rebounds up. This creates a vortex effect that can trap any object (animate or inanimate) under the water. If caught in such a flow, the recommendation is to compress yourself into a small a ball as you can, and hope that you get kicked out of the vortex. It's more associated with low flow dams, but the frothing water in the area indicates that the same effect is occurring here. Image of the danger. https://images.squarespace-cdn.com/c...g?format=1500w Hopefully this makes sense. |
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#33
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07-14-2022, 12:50 AM
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 ♚ Legacy Gold Member ♚ Poster Rank:269 Join Date: Aug 2010 Posts: 5,007 Mentioned: 0 Post(s) Quoted: 266 Post(s)
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Re: Water Rescue Ends Badly
Appreciate what these guys did. Saved the kid. They deserve ultimate respect.
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#34
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07-14-2022, 03:17 AM
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 My Rank: SECOND LIEUTENANT Poster Rank:258 Join Date: Apr 2010 Posts: 5,412 Mentioned: 1 Post(s) Quoted: 901 Post(s)
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Re: Water Rescue Ends Badly
Wow, that was intense. And for once, it felt like people attempting to be genuinely brave and not having the time to think things out instead of genuinely stupid. Did they actually perish?
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#36
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07-14-2022, 11:54 AM
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| My Rank: SERGEANT Poster Rank:1159 Join Date: Feb 2014 Posts: 550 Mentioned: 0 Post(s) Quoted: 154 Post(s)
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Re: Water Rescue Ends Badly
what kind of chithole country has something like this OPEN TO THE PUBLIC like that???? i guess they don't care aobut life there. |
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#38
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07-14-2022, 01:24 PM
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 ♚ Legacy Gold Member ♚ Poster Rank:97 Male Join Date: Dec 2009 Posts: 16,758 Mentioned: 26 Post(s) Quoted: 10600 Post(s)
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Re: Water Rescue Ends Badly
KC posted a comment (in ching chong ching chong language) that purportedly suggests that everything turned out alright (ie, everyone survived). I prefer to cling to that news like a life preserver  |
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#39
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07-14-2022, 03:22 PM
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| My Rank: PRIVATE Poster Rank:10872 Join Date: Nov 2011 Posts: 12 Mentioned: 0 Post(s) Quoted: 3 Post(s)
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Re: Water Rescue Ends Badly
I feel this. They always call the hydraulic rollers of these low-head stream features “the drowning machine”. This is exactly the reason. Force from falling water pushes you down and the super aerated air in the pool reduces your buoyancy… even with a PFD. My main personal experience with dead bodies is after situations like this, and being on many water rescues that didn’t retrieve a live person from the drowning machine. You… gotta get out before that. Leisurely and calmly floating towards it while weakly grasping a stick is… not the way.
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