I see your water bridge, but ask, what happens when a big boat wants to get past? I'll tell you what happens- The Barton Swing Aqueduct.
this post was submitted on 01 Oct 2025
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Amazing.
Thankfully that waterway has a bridge so it doesn't have to get wet crossing the river!
I wanna see two boats cross this at the same time.
Here's a fun fact action lab pointed out: setting aside wind, etc, the load the bridge has to be designed for is only the water that fills it.
That bridge will have the same force on it from a tanker or a kyaker.
Because boats and ships displace the heavier water?
Boat displacement is the amount of water the boat displaces while floating. It is equal to boat weight.
So, if you put a 100 ton boat in enclosed bowl, you will of course get 100 tons more on a scale. However, if you do the same with a large surface body of water (river, lake, ocean), the water will be displaced equally over a large surface area, thus distributing the weight. You still get 100 tons more, but less over the are "under" the boat.
I'm only going to be a pedant because that's sort of the point of these conversations, that's not a bad interpretation and I appreciate you posting it.
Edit re-reading your answer we might be saying the same thing. Leaving incase this version lights someone's bulb
BUT, it's not so much that it's "distributed" as that, so long as the boat floats, there will be a mass of water displaced exactly equal to the mass of the boat. In this case it's displaced off the bridge (off either end). There is zero force being applied up or downstream (except during the initial transition). That's the fun thing about incomprehensible fluids, every infinitely small point at the bottom of a water colum ONLY has the force of the column above it acting on it. A pressure gage will read the same for a square mm or square m.
Spot on with the bowl though. The displaced water can't leave the system in that case so the masses add.
Heres the action lab video BTW! https://m.youtube.com/watch?v=SUq_tM3yGTM&pp=ygUKQWN0aW9uIGxhYg%3D%3D
That's the fun thing about incomprehensible fluids
MFer talking about lovecraftian non-euclidian water
Did you think shadow of innsmouth was warning you about the fish? Nah man. Evil H2O.
I assume you mean incompressible? I can comprehend water just fine
That makes one of us. Fluid dynamics gets screwy.
I am no physicist, so thanks or added context!
I see your Waterbridge and I raise you this 200 year old Waterbridge.
I ii
II L
Drinking water vs. animal/human effluent/carcass water?
Just don't cross the ~~beams~~ streams.
In the documentary Canal Boat Diaries the dude goes over several of these, each time i was like phhhrrrrfuckwhat
The aquaduct at Llangollen is particularly alarming to be on
That's some Water 7 type boat highway.
gamechanger
Yo dawg I heard you like water bridges... Etc
Bridge under the river Kwai?
Aquaduct