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[Macalano]

Now i've just gotten into dwarf fortress a week ago, and I'm still learning a lot but I've got the basics down. I've been reading a lot on the forums about pumps, and magma, and what kinds of problems magma solves (though I have not yet encountered it since my fortress of Warspoon is on the beach).

I was wondering...
(please ask me if this sounds confusing)

If you construct a water pump that goes high enough (highest z level) and showers water down on to a

high pressure magma pump shooting through the downpour of water
would it create a solid magma (obsidian?) arc?

Terra-forming! o_ O

[Skorpion]

Actually, you'd get a lot of dropping rocks. Especially since magma doesen't flow like water.

Drop the magma into a jet of water, however, and you have a fairly good trap.
Well. As long as you don't dig extensively into the first Z-level like I tend to.

[JaaSwb]

I'd say this would probably just create a pile of obsidian at the bottom.

Pressure in DF is completely unlike pressure in real life - it merely indicates the level to which liquids may rise. Your magma pump would simply cause cubes of magma teleport to their exit tile, giving it no momentum whatsoever - they'd fall straight down.

Where magma and water intersect, obsidian is created, so you'd basically turn a waterfall into a rockfall.

[Thief^]

Not that that's not awesome

[Macalano]

Not that that's not awesome

I like the falling steam+magma rock dropper though.

[Footkerchief]

Note that the dropped rocks won't damage anything they fall on either.  Yeah, it sucks.

[Akigagak]

They don't mean rocks, they mean 'natural' rock walls.

That most certainly will kill and maim things.

[Footkerchief]

Oh damn, that's right.  I forgot about that.  Yeah, it'll hurt.

[zecro]

This isn't exactly related to a magma arc, but it's along those lines.

Say I built half my fort underground, and want to build up, except I want to make a tower of obsidian which I will then carve.

I would be pumping magma and water, obviously, and making a pool of one inside a cast and then dropping the other liquid into the pool.

What's better, dropping the magma into water, or dropping the water onto magma? And should I cast the tower layer-by-layer or just go at it once? If I go at it at once, would the obsidian walls that fall through the water or magma cause a cave-in on the underground levels of the tower?

[jocan2003]

Each time water will touch a new magma tile a *cave-in* will occur wich mean a lot of interuption, im not sure you want a trap like that, i would mean to many cave-in event as the new natural rock obsidian fall down as soon they are create

[zchris13]

Great way to frame-by-frame destruction though.

[Quantum Toast]

Won't the obsidian walls eventually stack up high enough to get in the way of the water/magma?

[Sizik]

This isn't exactly related to a magma arc, but it's along those lines.

Say I built half my fort underground, and want to build up, except I want to make a tower of obsidian which I will then carve.

I would be pumping magma and water, obviously, and making a pool of one inside a cast and then dropping the other liquid into the pool.

What's better, dropping the magma into water, or dropping the water onto magma? And should I cast the tower layer-by-layer or just go at it once? If I go at it at once, would the obsidian walls that fall through the water or magma cause a cave-in on the underground levels of the tower?

The best way is to put down a layer of magma, then cover it with water such that the magma gets turned into obsidian with a layer of water on top, then pour on the magma, forming another layer, and repeat.

Step 1:
|                      |
|                      |
|                      |
|                      |
|~~~~~~~~~~|
------------------

Step 2:
|                      |
|                      |
|                      |
|~~~~~~~~~~|
|###########|
------------------

Step 3:
|                      |
|                      |
|~~~~~~~~~~|
|###########|
|###########|
------------------

[jocan2003]

Won't the obsidian walls eventually stack up high enough to get in the way of the water/magma?

Eventually yes

[Armok]

Screw armies, Toady should totally work on the Flying Magma Development Arc.