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Dr. Zaus

Lifer
Oct 16, 2008
11,770
347
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Is there so much waterpressure that it can lift a car ?
That is amazing.
It’s a backup of the sewer - you can see they are in flood conditions. Sometimes the path of least resistance for the flood water is through the sewer and then it spouts up with incredible force - like an artesian well
 
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Reactions: destrekor

[DHT]Osiris

Lifer
Dec 15, 2015
14,658
12,781
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Is there so much waterpressure that it can lift a car ?
That is amazing.
When I was younger we had a local mall (pretty big one) that had a very expansive parking lot around it. Scattered around it were random manholes that were just party of the city sewer system. Well, one time we had a flash flood (TX, it happens) and it completely flooded out the storm drain system and so much pressure got pushed in the system that it started actually firing off these manhole covers like 20ft in the air across the parking lot with little geysers following. Was bizarre to watch them pop up, was like a movie scene.
 
May 11, 2008
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When I was younger we had a local mall (pretty big one) that had a very expansive parking lot around it. Scattered around it were random manholes that were just party of the city sewer system. Well, one time we had a flash flood (TX, it happens) and it completely flooded out the storm drain system and so much pressure got pushed in the system that it started actually firing off these manhole covers like 20ft in the air across the parking lot with little geysers following. Was bizarre to watch them pop up, was like a movie scene.


It’s a backup of the sewer - you can ser they are in flood conditions. Sometimes the path of least resistance for the flood water is through the sewer and then it spouts up with incredible force - like an artesian well

Yeah, that makes sense to me too. Now that i remember it. We had a few years ago a lot of rain here and it rained so hard that the man hole covers moved away because of the water pressure in the overflowing sewer . I had to lift ta manhole cover to put it back into place because otherwise i could not get out of the parking space with my car. Manhole covers are very heavy, i have learned.
But i was replying to the suggestion from stopsighhank that it was a fire hydrant. Because i doubt that sincerely.
 

destrekor

Lifer
Nov 18, 2005
28,799
359
126
Yeah a hydrant definitely would do that, but it also wouldn't be delayed. You knock that hydrant off and car gets lifted immediately.
The original clip in discussion was definitely storm sewer pressure during a flood, not a hydrant.
 

destrekor

Lifer
Nov 18, 2005
28,799
359
126
Here's a great example:


It's so violent it rips out an entire chunk of concrete as that was a sewer grate set into the concrete. It could survive practically anything else, but that torrent of water had far too much force.
 
May 11, 2008
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Incredible. I would not have expected that. But it makes sense when seeing a run away firehose flying around..
I must verify this with a colleague who is a voluntary firefighter.

But here in the Netherlands, i think that the pressure is not that high, just enough volume/second is needed. The pump is in the firetruck and delivers the pressure.Sometimes, when there is no fire hydrant nearby, water is taken from another fire truck or from a local canal.
 
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