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[Baughn]

Unfortunately I didn't retain any saves from before the flooding, so some backstory:

I had tunneled into a mountain lake from below, to get water from my well - all other sources had dried up. The lake was level with my main fort, so I built an access tunnel for the digging from two levels above - pressure forced water up one of those levels. I also dug another level down just to the right of this access - my well was fed through this tunnel. Obviously it would've flooded, thus there was a floodgate to cut off the water supply.

After I finally dug into the lake, this happened:

• My miner ran for his life, ahead of surging water
  
• A giant toad got sucked in and got bruised - yay!
  
• Water surged *even faster* through the lowest tunnel, into the tiny well chamber, and out of the well
  
• I pulled a lever, dropping the floodgate and stopping the flood. It dried up fairly quickly.
  

So far, so good, but the seeds of disaster had apparently already been laid. I don't know if this would have happened had I stopped touching it, but regardless, a little later I decided to drain the well chamber (by digging into it from the side) and install a pressure plate to control the floodgate. Thus:

• Drain channel was dug. Well drained.
  
• Pressure plate installed, but the floodgate was still underwater - odd, since the water there *should* have been forced into the well chamber by pressure; moreover, there was still a 7/7 square on the stairway above the floodgate.
  
• Time passed. Not much time, but some. Eventually, and apparently spontaneously, the well chamber started flooding again - and didn't stop, flooding my kitchen too but not flowin upwards.
  
• I saved, copied the save, then made a movie of my various attempts to fix it - the last one successful.
  

You can find the savegame and (long) movie at  http://brage.info/~svein/df/ .

Although I successfully stopped the flood, I'll be reverting to the save to see if I can figure out exactly what caused it, and what stopped it. I'll be replying here if I do.

[Toady One]

So in this save is there an ongoing infinite flood?  Or has it stopped?

[Baughn]

It's still flooding in the save. The flood has no pressure, so it doesn't go upstairs, but if you mine into it from the side you still get infinite water.

[Toady One]

Okay, I've downloaded it and I'll check it out when I do my other infinite flow saves.