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Stick to dress making
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Who knows
- Thread starter noseall
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It is spread throughout the canal system. Because the aqueduct is open at both ends. The water level in the aqueduct doesn't rise when a barge enters it.
I would say the answer is no.
The reason is because this:
If you imagine the canal is 10 miles long and closed at each end, the total weight bearing down on the bottom of the canal is the weight of the water plus all the barges floating on the water (because the barges cause an increase in the water depth in the canal)
water finds its own level so the water displaced by a barge is spread over the whole 10 miles of the canal.
The weight of the barge in question adds to the overall weight in the canal, so the aqueduct does experience an increase in weight as a result of the barge in the canal (as water displaced increases water level) but it makes no difference where the barge is in relation to the aqueduct. Weight doesn’t increase when the barge passes over the aqueduct.
The reason is because this:
If you imagine the canal is 10 miles long and closed at each end, the total weight bearing down on the bottom of the canal is the weight of the water plus all the barges floating on the water (because the barges cause an increase in the water depth in the canal)
water finds its own level so the water displaced by a barge is spread over the whole 10 miles of the canal.
The weight of the barge in question adds to the overall weight in the canal, so the aqueduct does experience an increase in weight as a result of the barge in the canal (as water displaced increases water level) but it makes no difference where the barge is in relation to the aqueduct. Weight doesn’t increase when the barge passes over the aqueduct.
Explained in my full answer above
OMG! That's what I said! Hopefully we are right!
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No...mounjaro
Indeed, you were the first person to correctly identify the vital bit: where the water goes.
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The mass of the boat displaces the water, depending how the displaced water reacts depends on where the load goes.
The amount the local aqueduct supports "feel" the additional mass is dependant on the wave/displacement caused.
Ultimately the weight will distribute over the whole water system, when it settles but in the short term depending on the speed of the vessel and therefore the wave height caused by the movement and displacement of the weight of the additional volume will bare on the supports.
The amount the local aqueduct supports "feel" the additional mass is dependant on the wave/displacement caused.
Ultimately the weight will distribute over the whole water system, when it settles but in the short term depending on the speed of the vessel and therefore the wave height caused by the movement and displacement of the weight of the additional volume will bare on the supports.
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Yes temporarily due to the wave caused
other than the wave caused by the boat displacing the water.
Once the boat stops and the water settles, you would be correct.
Given the Barge is moving and therefore displacing water locally which has not settled across the whole system - the answer is yes.
Except, of course, that the displacement of the barge moves away an equal weight of water, so the answer is no.
"Displacing water locally" raises the water level by a tiny amount over the entire canal. It might be enough to discern by precision measurement close to the vessel, but the boat does not have a footprint of increased pressure under it. Divers are not crushed every time a ship passes above.
D
Deleted member 317777
Yes, the aqueduct supports do feel the weight of the barge.
Here’s why:
An aqueduct that carries a canal is essentially a bridge filled with water, and when a barge (or any boat) floats in that canal, it displaces water according to its weight (per Archimedes’ principle). The total load on the aqueduct structure remains the same whether it’s just water or water plus a floating barge—because the barge displaces its own weight in water.
Breaking it down:
Conclusion:
Yes, the supports feel the weight of the barge, but not more than the weight of the water it displaces—they effectively support whatever weight is sitting in the canal, barge or not.
Here’s why:
An aqueduct that carries a canal is essentially a bridge filled with water, and when a barge (or any boat) floats in that canal, it displaces water according to its weight (per Archimedes’ principle). The total load on the aqueduct structure remains the same whether it’s just water or water plus a floating barge—because the barge displaces its own weight in water.
Breaking it down:
- The barge floats because it displaces a volume of water equal to its weight.
- That displaced water pushes against the aqueduct structure just as the barge’s weight would.
- So, the total downward force on the aqueduct supports remains unchanged: the weight of the water originally present is now distributed between water and barge, but the total is the same.
Conclusion:
Yes, the supports feel the weight of the barge, but not more than the weight of the water it displaces—they effectively support whatever weight is sitting in the canal, barge or not.
