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[ledgekindred]

I embarked in a location where I discovered it rains more often than not.  I breached a murky pool to flood a farming plot, expecting the usual, that the pool would drain into my farming area, then I could wall off the pool and start farming.  While it was raining, the pool (a relatively small one, maybe about 8x10 tiles) was filling up faster than it emptied and I had to get my miners digging like mad to expand the flooded surface fast enough that I could get a mason    to run in and wall up where I had breached it. 

On the one hand, hooray!  An endless supply of water.  On the other hand, wow, a murky pool can fill up from rain faster than it can be drained by flooding out into my farming plot?  I never imagined a murky pool was threatening to flood out my entire fort.

[Levi]

Maybe the soil nearby was an Aquifer?  http://df.magmawiki.com/index.php/DF2010:Aquifer

I never embark on them, as they sound dangerous and annoying.  But it sort of sounds like that might be the problem?

[Psieye]

The terrors of maximum rain and minimum drainage. Can be partially avoided at worldgen by saying "no the maximum rain won't be 100% and the minimum draingae won't be 0%".

[ledgekindred]

Nope no aquifer, just lots and lots and lots of rain, apparently.  I was watching the water level drop, and the level at the exit point where I breached it only went down to 1 a couple times after I had cleared out a ridiculously huge amount of space for it to drain into.  I had to continuously un-suspend building the wall just to hit a point where it was low enough to build.  Tiles on the opposite side of the exit never went below 4 or 5 and went up in depth several times while it was still draining.

Not so much a "question" as a "statement" I guess.  I recall seeing a question on this forum a while back asking if murky pools would ever refill from rain, but couldn't find it.   Answer: yes!  Under certain conditions anyway.

[Black Bellamy]

Build a roof over the pool?