At the time this happened, I was daydreaming about an alternate reality where you can ride on an overnight sleeper raft. The raft has a small cabin with a bed to sleep inside and moves through a 2.5 meter wide tube with water flowing through it. The raft moves through the water very slowly but it doesn't matter because you spend the whole night sleeping inside the cabin on the raft. You could also watch TV and sit on the couch inside the raft.
There would be tea set inside the cabin but the hot water would come from a flask instead of a kettle. There would be a cabin battery that powers the TV lights and usb sockets in the cabin. There would also be a flask tank to supply a small shower with water.
The aquaduct would be a delivery system for moving goods around the country where water is pumped in through one side of the duct and exits the other end carrying rafts full of goods during the day and rafts with small cabins on them during the night. You would get in the cabin, sleep during the night in the cabin on the raft and wake up in a different city after a having the smoothest trip ever. The aquaduct would also be a flood defense system taking water away from rivers that have too much water in them.