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[revlob]

The wikis say that magma does not flow 'up', but that when poured into a pool, it will raise the level. If I dig a tunnel up to a magma vent, and dig some channels in the floor of that tunnel, I expect the channel to fill but what happens when it is full? If this was water the channel would overflow, and the water would keep on travelling, but with magma I'm not sure. Here's what I mean:

code:

~~~#===OOO@
~ Magma
# Wall
= Tunnel
O Channel
@ Dwarf

When I remove that last piece of wall, will my dwarf be safe or not?

[zagibu]

I suppose it doesn't overflow. I dug into a magma vent 3 levels below it's surface, had the tunnel end in a channel (to drop garbage in) and it has not overflown in months.

[Zereth]

Your dwarf will not be safe. However, if that's the, say, fifth level down of the magma vent, and the dwarf was staring into some channels on the level above, he would be.

[stoney]

That would overflow.  If you dig the tunnel on the level below where you're dwarfs will be, it won't overflow:

code:

 
Sideways view:
~~~####___@
~~~#======
~ Magma
# Wall
= Tunnel
_ Channel
@ Dwarf

Then remove the last bit of wall

code:

~~~####___@
~~~~~~~~~~
 

[Zironic]

remember to create fortifications to keep imps out - using smooth wall then fortify wall. example

code:

 
1.~~~#________ 2.~~~#________ 3.~~~# _______ 4. i~~#________
  ~~~~##======   ~~~~#F======   ~~~~~F~~~~~~    ~i~~~F~~~~~~   

1. Basic set up - a pre-built tunnel.
2. Fortify the front of it with 1 wall space inbetween magma.
3.Channel out the wall space - magma flows through the space
4. Cover the channel boom- imps can't get through fortification or channel!