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[gamewizardinnc]

I just started a new fortress on a volcano because I wanted to see what magma was like. Once summer came around I decided to hook me up some magma forges. After channeling the necessarily path I let the magma loose. Turns out however There was a gap I didn't notice...

So to summarize I flooded the entrance to my fort. With magma. Anyone to drain it? No casualties BTW But I only have 7 dwarfs to work with and I was forced to seal the only entrance to my fortress. I need those migrants. Help please.

[ed boy]

Can you make a hole in the roof of your fort and use that as your new entrance?

[Graebeard]

First thing's first: make a new, well guarded entrance to let the migrants in and keep the gobbos out.

Second, stop the flow of the magma.  Magma floods are a lot easier to stop, because the magma will never rise above the level you cut into the tube at (unless you're pumping it out).  Probably the easiest way to do this is by pouring water over it.  Do you have a river?  If so, pull some water out of there and shoot it at the encroaching magma.

Then, once you've stopped its advance, you can obsidianize the rest of it or just use it as a magma reservoir for fun traps or a magma industry. 

[IT 000]

Make a succession game out of this

[Dr. Hieronymous Alloy]

You can use a pit/pond designation and a water bucket brigade to pour water on it and turn it to obsidian.

[Crashmaster]

When using buckets I think you need to drop the water from at least 1 z-level above the surface of the magma for it to make obsidian instead of just turning to steam... or so I've read.

[Sutremaine]

Yes, it needs to fall through a full z-level or more of open space.