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[SeanTucker]

I just got an embark location with two magma pipes, an underground lake, and adamantine.

One of the magma pipes is in juuuuuuust the right spot for me to carry out my own Boatmurdered-style Operation: Fuck the World.

However, will this literally fuck the world (as in, keep anything from getting to my fort, forever) or will the magma cool off after a while? If the former, I may end up reconsidering my epic plan and just submerging my trade depot whenever elves show up.

[Shinziril]

If the map is flat and you flood the entire surface, the magma will not flow off the edge of the map (it's just like that) and will prevent caravans. 

You can, however, wall off the edges to within 5 tiles (the build limit), use raising drawbridges to the edge to preserve a very small entrance, and then flood the rest of the edge to restrict traffic to that portion in a very dwarfy manner.  (Be sure to actually raise the raising drawbridges before you activate the magma pumps!)

EDIT: See Snaketributes for an example of this.

[Retro]

For reference, Snaketributes, one of the best examples of magma-controlled map access.

ed- Gah, ninja'd by an edit.

[Diablous]

Two magma pipes!?! Save file plz?

[DarkDragon]

Two magma pipes!?! Save file plz?

It's probably a pipe and a pool. I don't think it's possible to have 2 pipes on the same region tile, unless someone has figured out a way to do that via modding or memory address hacking.

[NW_Kohaku]

Do note: Unless you have a fairly small map, this will positively decimate your framerate.  Liquid flow calculations are very CPU-intensive, especially when you have thousands of tiles being calculated every single tick of the clock.

[Itnetlolor]

Yeah, my site has a pool and a pipe within close proximity of each other.

As far as I know, it shouldn't be possible. Do both of these start from the bottom level and scale all the way up? If so, then they are pipes. If within a Z-level or 2, then they're pools.

[ShadowLuigi147]

Magma airlocks sound pretty awesome! Just be sure to make everything that will be doing the air locking is magma-proof...otherwise yay melting mechanisms and flaming test subjects!

[SeanTucker]

Oh, nevermind, it's a pipe and a very large pool.

[DarkDragon]

Do note: Unless you have a fairly small map, this will positively decimate your framerate.  Liquid flow calculations are very CPU-intensive, especially when you have thousands of tiles being calculated every single tick of the clock.

I have been able to run my magma flooding device at 15-20 FPS pretty reliably.

The real killer is the pumping it seems for me. The actual flow once it gets going doesn't seem to hurt the FPS for me, but if the pumps get "dry" the FPS goes to shit, which is really weird.

[kg333]

Best of luck to you with flooding the world.  I gave it a try and failed...I emptied the magma pipe, and still couldn't pump fast enough to keep the stuff on the surface from evaporating.

KG

[XSI]

Two magma pipes!?! Save file plz?

It's probably a pipe and a pool. I don't think it's possible to have 2 pipes on the same region tile, unless someone has figured out a way to do that via modding or memory address hacking.

It is possible, but extremely rare, there was another case mentioned on the forum a while(Several months ago even?) back, and apparently the game only shows one of them at embark, even if there are more. My memory is a bit fuzzy, and I don't know the rest of what happened in the thread, but I think it may be possible to have a volcano with magma pipe at the same region tile. Technicly they are both magma pipes, but there is a small possibility the game mistakes it for something else.

Not that it really matters, the way we get our magma will change next version anyway, and I won't be surprised if there are several ways of getting (near)infinite magma.

As for the OP's question, which I'm not sure is answered as he intended the question, there are 2 things.

Magma does not drain off the map.
And Magma will only cool off if it's at 1/7 depth, 2/7 will not cool.

From this it can be concluded that if you use just enough magma it is possible to completely wipe the map of live, while allowing the magma to slowly cool. Note you can store magma in an aboveground reservoir while letting the pipe refill. I made a magma flooding device, success is easier at small maps.

[Malibu Stacey]

Do note: Unless you have a fairly small map, this will positively decimate your framerate.  Liquid flow calculations are very CPU-intensive, especially when you have thousands of tiles being calculated every single tick of the clock.

That's only true if you have many tiles of non-7/7 liquid & even then it depends on what the liquid is doing, where & how often as DF fakes a lot of the calcs when it can (for obvious reasons). A dozen or so murky pools with 6/7 water & 1 7/7 tile each are more likely to impact framerate than untapped magma pipes/pools.

[deoxy]

For reference, Snaketributes, one of the best examples of magma-controlled map access.

ed- Gah, ninja'd by an edit.

Man, a building destroyer 2 could just ruin your whole day...

[DarkDragon]

For reference, Snaketributes, one of the best examples of magma-controlled map access.

ed- Gah, ninja'd by an edit.

Man, a building destroyer 2 could just ruin your whole day...

Building destroyer 2 tagged creatures will destroy bridges that are down, but I don't believe they destroy ones that are raised.

Never tested it myself though, but I'm pretty sure the game treats raised bridges as constructed walls for all intents and purposes.