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[SquirrelWizard]

On this map, I'm planning on making a fortress that will be, save for maybe one or two floors, underwater. I've got some glassworks running. At the moment I'm not quite prepared to start construction, but it is coming up, and I'm starting to think about how I plan to design this sucker.

At this point in time there is only 4 or 5 z levels of ocean with further z levels of ground under that. To fully design this, I plan to excavate the ground to artificially deepen the ocean here. Anywho...

I'm trying to plan ahead for "FUN" as much as possible, and one thing I was thinking about was with my fortress I would have a level of fortress, that is the area the dwarves work in, then under that a level of piping (if magma or water is needed) and it being a relatively hollow cistern with grates that lead to the bottom of the fortress where the bilge pumps are set up. The concept being, if there is ever a flood in an upper level, it drains to the plumbing level below it, then drains to the bottom where it gets pumped out of the fortress at the top. Its a tad complicated, but I think it will be safe, but I'm seeing one problem, its excessively space consuming. Effectively each level is two levels worth of building. Another option is to have a central drainage that sends the water to the bilge pumps at the bottom but I'm not sure how effective that would be to dealing with an accidental flood.

Another question regarding plumbing.

If I remember correctly farms need to be irrigated if they're built on construction, do I need to have a system to reirigate each season or is it a one shot deal?

[Cockyy]

Once muddied the ground will stay mud (irrigated) forever. At least that's how it has been for me.

[andrea]

but i don't think you can grow things in an ocean biome

[Lonewolf]

My dwarven oil rig had a special dome for growing crops above the sea. After it was built and irrigated, the list of crops it could support was empty, despite seeds of aboveground plants being available. I had to build a strut which would support the entire complex and at the same time serve as an elevator underground, below sea level. You can grow standard dwarven crops underground even if there is an entire sea above it.

[SquirrelWizard]

k, thanks for the help so far. I have some more questions.

when I drop the flaming lignite barrel into the ocean, will it vaporize all of the water in the ocean evenually, or will it just create a hole in the ocean as it only vaporizes a small portion of it.

[redacted123]

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[Quietust]

when I drop the flaming lignite barrel into the ocean, will it vaporize all of the water in the ocean evenually, or will it just create a hole in the ocean as it only vaporizes a small portion of it.

Neither - all of the water will boil away instantaneously.
The extremely high water pressure will cause all of the water to constantly move toward the bin, and the high temperature of the burning lignite will cause the water to instantly vaporize when it gets close enough. Since the movement and vaporization happen at effectively the same time, it effectively turns the burning lignite bin into a black hole capable of absorbing an infinite amount of water.

With the huge amounts of water moving around (tens of thousands of tiles worth), your FPS will crash to near zero (e.g. 2 minutes per frame) until the only water left is 7/7 tiles sitting directly on top of floor tiles, and that'll subsequently spread around gradually.

Incidentally, pretty much the same thing happens if you try to drain an ocean into an aquifer.