Some people will GET OUT of a boat to walk across the aqueduck rather than even look across from the complete safety of inside the cabin or even the front cockpit of a boat. I suppose there is the illusory safety of having the railings on the towpath side to cling onto if overcome by vertigo. What they don't realise is that the towpath is cantilevered out over the trough, about a foot above the water, so they're actually walking on thin air. I wonder if they'd walk across if it was one of those glass pathways. Its a clever design feature that allows the water to flow around the boat, otherwise a boat progressing towards Llangollen would actually be pushing water over the side of the trough....
One interesting thing is that the canal has a distinct current running from just above Llangollen where water flows in from the Dee, progressing all the way to the junction with the Shroppie at Hurleston, where there is a reservoir to capture the excess water. The other interesting thing is that the Dee falls 126 feet from where it meets the head of the canal at Llantysilio to where the aqueduct passes over it, a mere 6 miles or so...
Another thing....
There is a big plug in the middle of the aqueduct.
Every now and then, the ends of the trough are planked off and the plug is pulled to empty the water so the cast iron trough can be inspected for corrosion, etc. Its an amazing sight to see it emptying into the Dee from ground level!