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[Iamblichos]

So here's the situation:

Previously, when building a well, I would produce a U-pipe into a reservoir a few levels below the actual well.  A diagonal at the bottom keeps the flow from filling beyond the reservoir.

This time I constructed it as usual and sent a miner to punch through into the underground river.  The entire hallway immediately flooded to a depth of 7 with no warning, and drowned the miner (without moving his body, so there was no water movement).  It was instantaneous. EDIT: For the sake of clarity, previously, water ran in at a normal rate - this was effectively "water teleporting".

Is this a new thing?

[PatrikLundell]

I haven't heard about such a thing, but I've never heard about an underground river either (well, maybe in reports from very old DF version with seasonal flooding and whatnot, but not in the 0.40.X-> I'm familiar with). I AM aware pressure is wonky upwards however, but that has usually resulted in a failure to flow unless prompted, rather than excessive flow.

[Mostali]

Was the water above the breach more than 1z deep? 

[Iamblichos]

It could be two tiles deep.  I would need to refer to the map again.  Would that cause this sort of explosive teleportation?

[Dunamisdeos]

I've seen something similar in highly pressurized pipes. It's wasn't ACTUALLY instantaneous for me, it just got forced through really quickly. When I move one frame at a time, I've been able to see it.

[Corona688]

This time I constructed it as usual and sent a miner to punch through into the underground river.  The entire hallway immediately flooded to a depth of 7 with no warning, and drowned the miner (without moving his body, so there was no water movement).  It was instantaneous. EDIT: For the sake of clarity, previously, water ran in at a normal rate - this was effectively "water teleporting".

I did extensive pressurized water experiments while trying to develop a carp cannon (back when carp were still hardcore) and that's what I'd expect when you breach a lake from beneath -- water from above lands on water below, creating a x/7 water block sitting atop a 7/7 water block:  Pressure.  This allows the water above to teleport through the breach straight to the end of the stream.  The draining won't even slow down until a significant area of water around the drain is below 2/7.

I tried to put a wall through an underground lake with pumps and couldn't do it.  You can do so with a brook but not an underground lake.  An underground lake covers big areas and connects to wide stripes of map edge.  Very difficult to put a dent in it.

Something similar happened to me when I forgot how diagonals worked:



As fast as you can say *fworsh*, the room was full...  That sure taught me.  Either breach the lake diagonally, or channel from above.  Or some dwarfy arrangement of levers and pillars to punch a hole from above...

[i2amroy]

It could be two tiles deep.  I would need to refer to the map again.  Would that cause this sort of explosive teleportation?

Yes it can:
Flow: Fluids under Pressure, aka Teleportation.

[Corona688]

It could be two tiles deep.  I would need to refer to the map again.  Would that cause this sort of explosive teleportation?

Yes it can:
Flow: Fluids under Pressure, aka Teleportation.

Doesn't need to be two tiles deep to cause pressure, digging into it from below instead of the side makes it 2 tiles deep.

[Quietust]

It could be two tiles deep.  I would need to refer to the map again.  Would that cause this sort of explosive teleportation?

Yes it can:
Flow: Fluids under Pressure, aka Teleportation.

Doesn't need to be two tiles deep to cause pressure, digging into it from below instead of the side makes it 2 tiles deep.

If it's only one level deep, only a single tile is going to be "exerting pressure", and that won't be enough to do anything meaningful. If the entire lake is 2Z (or more) deep, then each tile that's >1Z deep will be able to "exert pressure" when moving (though a given 16x16 area will take a total of 16 ticks in order to fully move, due to the way that fluid updates are staggered).