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[Tacomagic]

And in the old version the water needed to drop at least one additional z level for obsidian to form in the magma sea. I don't know if that is still true. There was a thread where somebody described in detail how to drain the magma sea completely (well, almost).

From what I recall, that only applied if you were using a bucket brigade - if the water is already on the map (e.g. flowing from a river, lake, cistern, or aquifer), then it doesn't matter how far up it is.

This is correct.  I recently unintentionally smoothed over the top layer of a magma pipe during an aquifer dig when I drained into the cavern layer.  The water spread out from my drain and eventually worked its way over the pipe, slowly capping it.

[nasobema]

And in the old version the water needed to drop at least one additional z level for obsidian to form in the magma sea. I don't know if that is still true. There was a thread where somebody described in detail how to drain the magma sea completely (well, almost).

From what I recall, that only applied if you were using a bucket brigade - if the water is already on the map (e.g. flowing from a river, lake, cistern, or aquifer), then it doesn't matter how far up it is.

This is correct.  I recently unintentionally smoothed over the top layer of a magma pipe during an aquifer dig when I drained into the cavern layer.  The water spread out from my drain and eventually worked its way over the pipe, slowly capping it.

Which again makes things a lot easier to handle... I'd say my project is back to life.

[Saiko Kila]

I used to do it in v0.34.x and it still works: make shaped rooms above magma, put some shallow water in it, and mine (channel) exactly these tiles where you want obsidian to form one level below. There is no need to use more than 1/7 of water to create obsidian, so the shallow 2-3/7 pool allow miners to wade and create obsidian with pinpoint precision without bridges. The holes plug themselves so the water is conserved. This works best if the magma is directly below - the obsidian cubes cling to the level the miners are.

However, obsidian also clings to adamantine you are surrounding, and you can almost always create an obsidian bridge from the "shore" of magma pipe if there is need, that is when there is open space between magma surface and the miner's level floor.

[Tacomagic]

I used to do it in v0.34.x and it still works: make shaped rooms above magma, put some shallow water in it, and mine (channel) exactly these tiles where you want obsidian to form one level below. There is no need to use more than 1/7 of water to create obsidian, so the shallow 2-3/7 pool allow miners to wade and create obsidian with pinpoint precision without bridges. The holes plug themselves so the water is conserved. This works best if the magma is directly below - the obsidian cubes cling to the level the miners are.

This is one of those simple solutions that seem so obvious AFTER somebody points it out to you.  I'm going to have to give this a try.  I always engineer something overly complicated to do this job.

What am I saying... DF is all about over-elaborate ways of solving simple problems!

[nasobema]

This is one of those simple solutions that seem so obvious AFTER somebody points it out to you.  I'm going to have to give this a try.  I always engineer something overly complicated to do this job.

What am I saying... DF is all about over-elaborate ways of solving simple problems!

Simple is for elves!

[gunpowdertea]

I used to do it in v0.34.x and it still works: make shaped rooms above magma, put some shallow water in it, and mine (channel) exactly these tiles where you want obsidian to form one level below. There is no need to use more than 1/7 of water to create obsidian, so the shallow 2-3/7 pool allow miners to wade and create obsidian with pinpoint precision without bridges. The holes plug themselves so the water is conserved. This works best if the magma is directly below - the obsidian cubes cling to the level the miners are.

However, obsidian also clings to adamantine you are surrounding, and you can almost always create an obsidian bridge from the "shore" of magma pipe if there is need, that is when there is open space between magma surface and the miner's level floor.

This is not possible over the magma sea, at least for me it did not work at all. The water seems to need to drop an additional z level, as far as I understood the "draining teh magma sea" howto.

[Saiko Kila]

I used to do it in v0.34.x and it still works: make shaped rooms above magma, put some shallow water in it, and mine (channel) exactly these tiles where you want obsidian to form one level below. There is no need to use more than 1/7 of water to create obsidian, so the shallow 2-3/7 pool allow miners to wade and create obsidian with pinpoint precision without bridges. The holes plug themselves so the water is conserved. This works best if the magma is directly below - the obsidian cubes cling to the level the miners are.

However, obsidian also clings to adamantine you are surrounding, and you can almost always create an obsidian bridge from the "shore" of magma pipe if there is need, that is when there is open space between magma surface and the miner's level floor.

This is not possible over the magma sea, at least for me it did not work at all. The water seems to need to drop an additional z level, as far as I understood the "draining teh magma sea" howto.

I've just checked that method in v0.40.13 to be absolutely sure and it definitely works. The water the miner was wading was fluctuating, but the moment he finished the channel it was 3/7. He was greeted by "Praise the miners" announcement, because channelling revealed two adamantine veins in the sea, but what counts is that the obsidian wall was created immediately below (Z=-1) in the middle of magma sea. On the miner's level (Z=0) the hole was plugged by obsidian floor, as expected. Plus the usual steam.

If it doesn't work for you, check if the magma isn't "Magma flow" instead of "Open Space".

[Dorf and Dumb]

This is pretty straightforward:

1.  Dig a tunnel from some water source with a gate (door, floodgate, or bridge) controlled by mechanisms, that pours out directly above the adamantine.
2.  Dig out the whole region above the magma and adamantine, leaving plenty of extra room on all sides.
3.  After having a look if anything lives in the magma below, cut down stairs into every tile over the region.
* Note: you may want to think carefully about whether you do this over or adjacent to any 2x2 regions in the adamantine below...
4.  Turn on the water.  The magma turns to stone and sticks to the layer above.
* Unless you're directly over the 'magma flow' tiles; then you need to make sure all routes for magma to get into them are blocked.  Or... hit . over and over again as the water falls, until by luck you get the tile empty.  Command building a stairway in those tiles on that turn; nothing can suspend it once you get it designated.
5.  Turn off the water when all the ways for it to drain down are running out.