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[Andir]

I have a map with a magma vent two rivers and two waterfalls.  I was thinking about testing this, but I don't want to drain out half of my magma on something that may turn out to be a bad thing.

If I channel from the cliffside (over water) to the magma pit, will the magma hit the water and turn into Obsidian, then overflow that obsidian into the neighboring water, turning into obsidian, cascading into a complete conversion of all my river to an obsidian pile? Since it's a waterfall, would the water then collect on top of that obsidian, along with the lava, causing the next layer to turn into obsidian and so forth up until the entire valley is full of obsidian?
http://img204.imageshack.us/my.php?image=magmatestyz4.png

[ Edit: Spelling ]

[ June 12, 2008: Message edited by: Andir ]

[Agdune]

I havn't had much experience with lava physics at all, but I can't see why it would be a bad idea to try  

Also, good luck running that map at any decent speed, that's huge, and with that much running water? eep!

[Yourself86]

Well, i can at least tell you that it would take a looooooooong time for the magma to finally reach the "lavafall", if at all. Since magma flows quite slowly in itself it'll be getting slower and slower the farther away from the source it gets.

Like water magma/lava will evaporate if a tile stays too long at 1/7. I realized this once when i made a huge lava moat and the lava evaporated before it could reach the end.

[ June 12, 2008: Message edited by: Yourself86 ]

[Andir]

quote:Originally posted by Agdune:
<STRONG>I havn't had much experience with lava physics at all, but I can't see why it would be a bad idea to try  

Also, good luck running that map at any decent speed, that's huge, and with that much running water? eep!</STRONG>

It's standard size, I've never really had issues with that size before and I've had some pretty ugly water events.

[Dadamh]

I've done the reverse.  That is, dropping water from an aqueduct some two z-tiles above a magma vent.

It creates single blocks of obsidian where the water lands, which promptly realize they have no support and sink off the map, pausing the came with a "A portion of your cavern has collapsed!" message or somesuch.

Eventually water splashes about and you end up with a pure obsidian cap under the drop point.

For a waterfall, you'd end up with a similar result.  A pile of obsidian until the water got stopped.  Rivers in this game don't flow around dams, so one the obsidian filled a spot, the water would stop there.

So make darn sure you have  a way to stop the magma flow when you need to.  A magma-safe floodgate with magma-save mechanisms is a start.

Otherwise you'll have a thin layer of obsidian over most of the map and a spreading blob of magma as well.

[Dadamh]

Whoop, just looked at your image.

Ok, in the case of what you posted, you'll basically fill that lake-ish looking spot there with obsidian, or magma separated from water with an obsidian wall, at the top level.

Also you'll have a channel across a huge section of map, and things will be skittish about it.  Might cause fires, not sure on that.

[Andir]

I know it's not listed in the wiki, but can you make a magma safe gate out of obsidian?

[Dadamh]

quote:Originally posted by Andir:
<STRONG>I know it's not listed in the wiki, but can you make a magma safe gate out of obsidian?</STRONG>

So far as I've seen, magma-safe means Iron, Steel, and Bauxite.

Now, a closed floodgate made of featherwood will stop a magma flow.  As will a closed wooden door.  The problem is that once it's opened, it becomes unclosable and will burn in about two seconds.

[Karpatius]

If you channel water TO magma, the first drip of water will turn the magma into obsidian and thus blockade the water channel, right?

What if you drop water to the edge of the magma vent, thus extending a "bridge" of obsidian over the vent slowly?
Wouldn't this cap the vent so that no fire imps etc. can mess with your fortress ever again, provided you have tens of magma-proof grates in any magma pipes leading to your fortress, or some other intruder-magma-proof precation?

Actually, if it caps the vent, it would also create a giant hot-spring.

[Dadamh]

quote:Originally posted by Karpatius:
<STRONG>
Wouldn't this cap the vent so that no fire imps etc. can mess with your fortress ever again, provided you have tens of magma-proof grates in any magma pipes leading to your fortress, or some other intruder-magma-proof precation?
</STRONG>

Yah, see my first post in this thread.  It caps the vent with obsidian, and fireimps/magmamen stay where they should stay, underground in the goop.

Plus you get a neat blotch of obsidian there.  You could build a dark tower.