As recently as a hundred or so years ago, hollowed logs were used as pipes to move water. They were joined together in ostensibly water tight fitted connections.
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This pipe came from a mill in the Ottawa Valley area.
You can see how the one end is shaped to fit snug into another piece. The other end has been blocked and a slot cut to direct the water out. It is 8 feet long and 5.5" square in cross section.
A unique conversation piece for your garden - nobody else has one.