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[Marshall Burns]

How about this: drain the lake into a massive cistern underground. Build the foundation of your tower, then pump all the water back into the lake.

[Madventurer]

Nope. It would just refill from edges.

Use magma instead. Magma+Water=Obsidian, which can be dug out once done.
Unless it is too hard or impossible to get.

[Marshall Burns]

Wait, it's on the edge? I missed that part. I thought it was in the middle and fed by a river or something.

Still, you can drain it from the bottom and then dam it. That one guy that ranched sea serpents drained the ocean, so a lake shouldn't be too hard.

[Loud Whispers]

Lakes that appeared connected to your map upon embark will refill from those edges.

...So nuclear coalbins, or

Spoiler (click to show/hide)

Cats. MAGMAAAAAAAAAAAAAAAAA

Cave ins would be a lot easier than the above though.

[MagmaMcFry]

But how can you remove the obsidian afterwards?

[Loud Whispers]

But how can you remove the obsidian afterwards?

Dig. Dig dig dig.

[Wannazzaki]

But how can you remove the obsidian afterwards?

Dig. Dig dig dig.

I AM A DWARF AND I'M DIGGING A HOLE! DIGGY DIGGY HOLE! DIGGY DIGGY HOLE!

[Marshall Burns]

Yeah, see? Dig. That's what I said.

[Spish]

Just thought of something. With a little extra effort, you can build a giant cast above the water and cool the magma into a solid cube (or whatever you want it to be) before dropping it in, that way you get a shapely chunk of obsidian rather than a circular, haphazard mess.

[Marshall Burns]

Ooh, I like that one.

[MagmaMcFry]

But how can you remove the obsidian afterwards?

Dig. Dig dig dig.

No, think about it: If you have a multiple-z-level obsidian cast acting as a dam in a lake, how can you remove it? If you remove the top first, you can't reach the bottom, and if you remove the bottom first, the water shoots through the hole and balances out. In any case, a dwarf making a hole into the dam will very quickly get washed away as soon as he's finished.

[Spish]

But how can you remove the obsidian afterwards?

Dig. Dig dig dig.

No, think about it: If you have a multiple-z-level obsidian cast acting as a dam in a lake, how can you remove it? If you remove the top first, you can't reach the bottom, and if you remove the bottom first, the water shoots through the hole and balances out. In any case, a dwarf making a hole into the dam will very quickly get washed away as soon as he's finished.

Aye, there's no way to completely remove the rock once you put it there. However, if you just remove the top layer, no one on the surface will be able to tell the difference.

Anyways, sculpting the obsidian before dropping it in is definately the best way to go.

[Loud Whispers]

But how can you remove the obsidian afterwards?

Dig. Dig dig dig.

No, think about it: If you have a multiple-z-level obsidian cast acting as a dam in a lake, how can you remove it? If you remove the top first, you can't reach the bottom, and if you remove the bottom first, the water shoots through the hole and balances out. In any case, a dwarf making a hole into the dam will very quickly get washed away as soon as he's finished.

Aye, there's no way to completely remove the rock once you put it there. However, if you just remove the top layer, no one on the surface will be able to tell the difference.

Anyways, sculpting the obsidian before dropping it in is definately the best way to go.

Well if you wanted to remove the obsidian, add more, make a chute, remove the lower area and wait for it all to drain out (assuming it has somewhere to drain to), then proceed to remove the rest, building/digging stairs and walls when needed. Building inside lakes is not the easiest of things to do :d

[MagmaMcFry]

Well if you wanted to remove the obsidian, add more, make a chute, remove the lower area and wait for it all to drain out (assuming it has somewhere to drain to), then proceed to remove the rest, building/digging stairs and walls when needed. Building inside lakes is not the easiest of things to do :d

So to empty a lake, a drain is always the best thing to use.

[Loud Whispers]

Well if you wanted to remove the obsidian, add more, make a chute, remove the lower area and wait for it all to drain out (assuming it has somewhere to drain to), then proceed to remove the rest, building/digging stairs and walls when needed. Building inside lakes is not the easiest of things to do :d

So to empty a lake, a drain is always the best thing to use.

Not if it fills from the map edge, plus you run the risk of FPS death