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[vp]

So I accidentally built a linear water reactor, a perpetuum-mobile machine similar to classic water reactor but much simpler.

First I built an ordinary hydro power plant with artificial underground river and fortifications in the edge of the map. Then for some reason I decided to cut the rivermouth off with a cave-in:



Surprisingly the water in remaining part of the river didn't cease to flow, the flag WATER_IS_FLOWING or whatever it's named, that flag apparently had not been cleared. I closed the incoming waterflow and so I have a big pool of physically stagnant water that logically is flowing from nowhere to nowhere and this quantum-like flowing generates 100 urists of power per water wheel:



It seems to me that it needs more science.

[Gigaz]

Yeah, it works like that. You can also block off the water flow with bridges.

[Fleeting Frames]

It also gets toggled on with aquifers (but not portable drains). Furthermore, this permaflow still carries off contaminants, which allows for self-cleaning water trenches for dwarves to walk through.

[DrCyano]

Here's a perpetual water power machine I built over an ocean (which apparently has no wind):

Spoiler (click to show/hide)

Z=1

Z=2

Starting the pump: