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[Gergination]

As I understand it magma pipes refill by spawning 1/7 tiles of magma where the top of the pipe should be.  If this 1/7 tile falls on top of more magma but is still a 1/7 tile will it eventually evaporate?

I thought I saw that it would but I can't seem to find that post again and confirmation on this is vital to my megaproject.

[kaypy]

"8/7" magma will indeed evaporate. "9/7" is of course fine again. I hollowed out a mountain to fill from a magma pipe and wound up with 1 full z-level and a mound of magma evapourating at the edges on the next level.

[Gergination]

Well it's going to be a nightmare to accomplish this project, but it must be done for dwarves everywhere!

[Demonic Spoon]

As I understand it magma pipes refill by spawning 1/7 tiles of magma where the top of the pipe should be.  If this 1/7 tile falls on top of more magma but is still a 1/7 tile will it eventually evaporate?

I thought I saw that it would but I can't seem to find that post again and confirmation on this is vital to my megaproject.

Wrong, they spawn little towers of 7/7 magma that then spread out.

[Quietust]

Also, 1/7 magma will not evaporate unless there is stone (or a construction) underneath - if it's on top of more magma, it'll just flow around and make pretty waves (which you won't see unless you turn on "show flow amounts").

[MrFake]

Also, 1/7 magma will not evaporate unless there is stone (or a construction) underneath - if it's on top of more magma, it'll just flow around and make pretty waves (which you won't see unless you turn on "show flow amounts").

What about 1/7 on top of 7/7, i.e. one z-level up?  That doesn't cause the same flow behavior does it?  It just sits (also, don't need flow amounts on to see this).

"8/7" magma will indeed evaporate. "9/7" is of course fine again. I hollowed out a mountain to fill from a magma pipe and wound up with 1 full z-level and a mound of magma evapourating at the edges on the next level.

[Quietust]

What about 1/7 on top of 7/7, i.e. one z-level up?  That doesn't cause the same flow behavior does it?  It just sits (also, don't need flow amounts on to see this).

Reading comprehension for the win:

Also, 1/7 magma will not evaporate unless there is stone (or a construction) underneath - if it's on top of more magma, it'll just flow around and make pretty waves (which you won't see unless you turn on "show flow amounts").

In this case, "more magma" means "7/7 magma". As for the flowing around, see this video for an illustration of what you should be seeing.

I hollowed out a mountain to fill from a magma pipe and wound up with 1 full z-level and a mound of magma evapourating at the edges on the next level.

In this case, the most likely result was that the magma chamber being filled was not 100% uniform and had floors along the edges, onto which the magma settled and evaporated.

[MrFake]

Well, you wouldn't need flow amounts on for 1/7 on 7/7, only for 1/7 on 1-6/7, which is, in a sense, magma on magma.

Clarity for the win.

[Sizik]

1/7 magma on top of 7/7 magma WILL evaporate. I know this from trying to fill a 42x42x2 room with magma. The first level went fine, but the second level reached some sort of equilibrium, never filling more than some percentage of the tiles with 1/7 magma.

I was able to overcome the problem by having magma come into the chamber via two sources rather than just one.

[Quietust]

Now I'm curious - does the same evaporation happen with water flowing on top of a 7/7 water tile? Because if it does, that's almost certainly a bug.

[Skorpion]

Not a bug. Water evaporates from large bodies all the time. That's why it rains.

[Quietust]

Water at a depth of 2 or greater only evaporates in hot climates - in a temperate area (or underground), water deeper than 1/7 will never disappear (unless a dorf decides to drink it).

[kaypy]

Water at 8/7 will also evaporate, even underground:
http://mkv25.net/dfma/movie-1648-evaporationdemonstration

[Albedo]

Yeah, if you drain a magma pipe down past the top level, then if the top level  is significantly smaller it can have trouble ever refilling (because new magma is actually generated from/on that top level, not the bottom.)  If those 1/7 tiles on that level don't get refreshed enough, you lose 'em, regardless of the layers and layers of 7/7 below.

Yes, lame.

[Gergination]

Bah, well I can always pump up from a 7/7 layer into a storage, let it refill those and then put some back in so that it goes above 1/7, wash, rinse, repeat.