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[Argonnek]

I have a magma pipe, but I need to drain it for a megaproject, and I'm wondering how. Any suggestions?

[immibis]

Possbilities:
* Pump magma into a chasm/bottomless pit
* Pump magma into another reservoir until the level's low enough, then seal it with obsidian (or don't). You can also pump it back later to refill the pipe faster
* Not sure if magma will drain through fortifications off the side of the map.

[NFossil]

Assuming you don't have chasm, I've heard people talking about carving fortification at the map edge, but I've never tried. Also, use powered pumps or it'll take a looooooooooooong time.

[Argonnek]

No chasm or bottomless pit, and pumping it off of the edge of the map doesn't seem to be working:


Looks like my only option is the evaporation method. 

[Ravenplucker]

You'll want to atom smash it with magma safe drawbridges

[NRN_R_Sumo1]

draw bridges is honestly the best way of getting rid of any type of fluid.

[Hyndis]

You cannot pump magma off the edge of the map, ever.

The only two ways to get rid of it are to crush it with bridges/doors/floodgates, or to spread it out so it evaporates.

[kotekzot]

Excess magma? I'm not sure I understand what you're trying to say.

[Garrie]

Excess magma? I'm not sure I understand what you're trying to say.

It's not so much excess as it is inappropriately located. ie, where it is, OP wants dwarfs to do something that magma unfortunately prevents them from doing.

[Demonic Spoon]

Use it for some crazy megeproject, and only water can go off of the edge of the map via fortifications. It's because magma cannot flow off the map, period. You can fill the enitre map up the highest z-level with water without any of it flowing off, and the amusing this is if you then came along with a adventurer it'd all start flowing off immediately. Someone should illustrate that.

[tigrex]

Pump the magma someplace where it couldn't possibly cause any trouble, such as the entire surface of the map. 

[Repulsion]

 Pump it around your base, making various cisterns, and other things like that. Try to use the magma for a series of traps that use magma, for your entrance, and maybe make a special one just for the Elves. Use it to power magma forges, if you have not already, and create a reserved spot for the nobles.

[The Scout]

I have a magma pipe, but I need to drain it for a megaproject, and I'm wondering how. Any suggestions?

Dig a large magma pipe structure and out the magma there. Also since you have a magma PIPE it will refill slowly.

[Kanddak]

I recently needed to partially drain a magma pipe temporarily.
I built a cistern positioned directly above the magma pipe, pumped the magma up into the cistern, and then when I was done, I rigged a collapse to drop all the magma back into the pipe.

[Shinziril]

That sounds effective, but how do you prevent the pipe from refilling while you're working?