The image must have been removed from the wikipedia article since 2011.
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Barton Swing Aqueduct is in an unattractive patch of urban Manchester, but impressive in engineering terms. It’s a canal-over-canal bridge which can swing aside to let big ships through:
The engineering needed to hold up a train (along a hillside, never mind over a bridge) is much cheaper than that needed to hold up a canal, because a train is much lighter than all that water.
2. ...Except that, if the level is maintained by water flowing over a weir, the weight of the boat is compensated for by a decrease in the water content of the canal.
3. Water level changes from launching a boat, or the lock operations to bring it into a section, propagate as waves, so do not take effect throughout the section immediately.
4. A moving boat creates waves in a canal. When the boat occupies a significant part of the canal's cross-section, water flowing around the boat's hull from stem to stern lowers the water level alongside the boat. I guess that it is possible for boats crossing an aqueduct to reduce the load on that aqueduct (while the bow wave may increase it.)
Edit: Google shows canal du midi is indeed from 1670 but this aqeduct section is later, completed in 1858 (the order was decreed by Napoleon himself according to wiki)
and one from 1690: https://en.wikipedia.org/wiki/Cesse_Aqueduct
The surprising part about fossa carolinga is how it happened at a time when most known infrastructure projects were hardly more than permanently staffed camps for a roaming band of warlords.
Apple Maps does not.
This whole area is pretty much paradise to bicyclists, from the D&R Canal's 70 miles of towpath, to the 15 miles of the Colombia Trail. There's a huge amount of riding to be done, completely off roadways and safe from cars.
Given that large US construction projects always seem to come out costing multiple billions of dollars, this seems quite cheap. The Eastern span of the Bay Bridge ran about $8 billion and Boston's Big Dig also multiple billions.