This video shows how water diverted from a river flow at one level will be pushed through a U-shaped tunnel through the mountain until it runs out of pressure.
Recorded by ToadyOne. See http://www.bay12games.com/dwarves/dev_next.html for more information.
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Submitted by: dragoncurse - 2011-01-07
So, basically, the water pressure will be off if the water comes at original z-level.