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[Oolon]

OK.  So here's a picture of my fortress' demise.

Yay devastation...

So the cause of this cataclysm appears to be the big diamond room I made upper right.  It was really late last night and I completely forgot about the 7x7 rule because I wasn't making a normal square room.  Lesson learned.

I got the message "You hear a distant rumbling" or whatever, and before I could react, there was water in every room west of the underground river, despite several doors in the way.  No water east of the river, and no obvious room collapse, despite of what I figured caused this whole thing anyway.

The huge blue ripples of water coming out the front doors are amusing, also.

So it seems a little buggy that a simple room collapse deep in the fortress would cause the entire area west of the river to be completely flooded.  The well in the room wasn't completed, btw.  And the flood didn't go away, either.  It drowned everything and lagged down my computer (3.4 GHz) in what seemed to be an attempt to calculate the various directions of the water bouncing in and out of rooms.

I'm posting it here because I assume it isn't normal.  And unfortunately there's no save game for you, since it bogged down the game so much after a few minutes that I had to crash the game myself.

[Gronut]

It's hard to tell exactly what's going on, but the potential room collapse (hasn't happened yet, from the looks of it) almost certainly has nothing to do with anything and it is mere coincidence that you heard the rumbling before your fort got washed out to sea.

However, what probably did happen has to do with the fact that when a man-made flood (as in for irrigation) hits a natural water source (a river), it basically becomes a permanent, megawoe flood. In the case of a locked farming room, you end up with a permanently flooded room, and artificial underground lake of sorts, but if someone were to enter that room and the floodwaters escaped, doom is upon you. Closing the door won't help if the floodwaters hit the river again in one of your main hallways, if you can even manage to close it somehow. I'd imagine that some variety of this scenario is what purged your dwarves from their homes.

Or it could be something completely different...

[Oolon]

Hmmmm....maybe that is what happened and I just didn't notice it.  Doors are passable when there's a flood behind them?

[Gronut]

Yup. You have to manually lock them if you want to keep dwarves from opening them while you're irrigating.