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The picture that the OP posted is a little misleading because it appears to show the boat traveling downhill.  Aren't catalogs and flyers all like that, even to this day?

Unfortunately in real life the ground upon which the waterway is set up would have to be extremely flat and level, otherwise the highest points around the loop would have very little water in them, and the lower ones too much.

What's the old plumber's saying?  "Remember: xxxx always flows down hill!"

M.

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