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[franti]

I found a great embark that spawned an idea for my next project: a Tenochtitlan-style city build in the middle of a fresh-water lake. I'm going to build it out of smoothed Limestone Blocks with Obsidian Blocks and Chalcopyrite Blocks providing ornamentation.

The area beneath the lake contains an aquifier and the lake never feezes.
I'd like some advice on how to:
1) Dig through a lake and an aquifier without pumps
2) Build realistic-looking supports on the botton of the lake for the structure above it
3) Pump magma to the surface through an aquifier for a forge

[malimbar04]

1 - either go crazy with bucket labors ( i > create zone on lake > w || i > create zone by hill > p > P > f). Your dwarves will use buckets to dump the water off a hill. Why not just use a pump though?

2 - when it is empty, put down a stone support (or wall) on the bottom. There should be at least one ramp or staircase on teh edge of the lake. I'd suggest a ramp, since it fits the whole "lake" idea better.

3 - a lot more complicated than a sentence or two. Basically pound a hole through the aquifer (moses effect or mountain- spear effect) ; pump up magma through magma-safe pumps, and then underneath your forge.

[Patchy]

Drain the lake into the aquifier and then punch through the aquifier with any standard breaching method you want. And then build a pumpstack as usual.

[krenshala]

Just remember, the lake will most likely act like a murky pool and refill when it rains, so don't block off your drain point until you are ready for the lake to be refilled.