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The water source is not infinite, just a rather large cistern below. Thanks for the tip, Quietust. I'll try that in my own fortress, it has a similar overflowing problem (this video was from a community fortress, see the link above).
I have brightened all colors, because with the default colors I can't see sh**. I didn't know they would show up in the movie.
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::shrug:: I guess I didn't need this space after all!