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[Variance]

I've thought of trying this for a while, but I haven't really come up with an idea of how to get the domes to the ocean floor.

It seems to me the only option is to drain the whole thing. As for that, I've seen posts in here that say that it's possible to drain infinite amounts of water into an aquifier. Now, I don't know if this is true or just old information, but it would be worth a try if you have an aquifier.

Don't forget about dumping magma into the ocean, but in the case of the aquifer, it will always continue to refill, but if you hook up enough pumps, the pump rate will exceed the rate at which the water is drained, and you can quickly build walls in the small area.

The problem with the ocean is that, unlike an aquifer, there are often multiple z-levels of water, the ocean refills along the map edges at every z-level, AND the water at the bottom where there are more than a couple z-levels of water is so pressurized that it effectively draws water from any tile on that z-level to instantly fill the hole you try to create using pumps. This gets worse the farther down you go with pumps through layers of water.

The pumping infrastructure you would need would be unbelievable, and could very well be impossible due to how many pumps you can fit on the map, even with floating water wheel powerplants and other exploits like that.

[Time Kitten]

The good news is that oceans tend to sit atop aquifires dirrectly, so you can sometimes just punch throguh the bottem.... oh, new stratagy pick a map with a nice winter freeze, dump in an ice wall to damn off the ocean, scramble like mad to start your domes... breed more dwarves after the thaw, build another ice wall and finish them.

[jplur]

I thought this was interesting so i did some testing..

Aquifer, floodgates, and bridges can all drain the ocean, at least down to the last level of water.  After that you would need to do the ring of screw pumps.

punching through an aquifer will insta-drain everything, the hard part is finding an ocean with an aquifer one level lower than the lowest ocean level.

Floodgates work but they are too time intensive to set up.

The bridge thing works great.  Just mine out a big room next to the lowest part of the ocean, fill it with drawbridges, hook them up to a lever, then send in an expendable miner to punch through.

Now I'm off to find a super deep ocean, drain it, settle on the seafloor, and let it fill back up.

[Foa]

Dude, I've got a great drainage plan.

You need two pumpers, per waterwheel to generate enough flow to activate them, and to use the ocean's aquifer to drain out the excess.

You may need to stack the pumps to make an overflow.

Aquifers absorb excess water, and bam, water free.

Text ladder post makes it easier for you lazy bastards to read the connected points.

[numerobis]

I have no idea what Foa's talking about...  I must be lazy.

Pumping out the ocean works, for the first level.  Make sure to build floors over any open water in your drained area, or else you'll have ocean waves spawning.

For the second level, you can't really pump water out fast enough just by dumping it back into the sea.  What happens instead is you get a huge wedge of 7/7 water one level above sea level emanating from your pumps.  It is rather an awesome sight, so I quite recommend it.  However, it slaughters your frame rate.

Connecting the ocean to the aquifer is another, much more effective way of doing violence to your frame rate.  But, it most certainly does work.  After opening the bottom of the ocean, go get coffee, lunch, a nice romantic date, get married, have a couple kids.  Then come back, and the game will have wiped out all but the bottom-most level of the ocean.  Things will be in the single-digits frames per second thenceforth, but not frozen.  As the beaches dry up, the framerate increases, but never gets outright fast until you close off the connection to the aquifer.

Oh yeah -- you did build a floodgate to do that, right?

[jplur]

This is hilarious, my guys have barely unpacked the wagon:

http://www.mkv25.net/dfma/poi-11423-theresaholeinthebottomofthesea

FPS is so bad I will have to leave it on all night.  I think once it drains I will put a cat in a little watertight box on the bottom and let the ocean fill back up

[Empty]

Wouldn't it be possible to wall off the bigger part of the ocean by making obsidian where you want the walls to be and then dumping them? And once it's completed you can use those bridges to empty out the inner part.

[Aldaris]

Wouldn't it be possible to wall off the bigger part of the ocean by making obsidian where you want the walls to be and then dumping them? And once it's completed you can use those bridges to empty out the inner part.

As I already said twice, I don't want ugly walls in my sea. And there is an aquifier on my map, 1 z level above the sea level, in a biome a region tile or two inland.

[jplur]

Ok, here's a question.  Will the ocean fill back up after you drain it?

My test world I drained the first level of ocean, and it seems to be gone for good.

EDIT: nevermind it just takes a while to fill back up

[Time Kitten]

As the recent solid fosil fuel experiments show, you can BURN IT... BURN It ALLL!!!!  BWAHAHAHAHA!

Erm... yeah, light a flux stone by putting it in a magma proof been, scrubbing with magma, then dropping it straight down into the lowest level of your ocean... any presurised water will immediatly hit and dissapait, turning your vast expance of water into a few small rivlets over the floor and a tiny puff of steam (be sure to restrict and forbid the entire area around the bin funtil it burns out) the rest should be easy for pumps to aim the water towards it or off to the side, and with a dingle one yuo'll have about a years time obefore just havign to dump another burnable rock atop it, letting it burn out only once you're through with the area.

[father_alexander]

any idea of how much surface should the bridges be covering?

[Smaug21]

If you don't want the walls there you could always build the bottom layer out of supports linked to a lever 

[Gertack]

http://mkv25.net/dfma/map-3966-blockaderhyming

[tsen]

There is a simpler way to do it, it's just intensely laborious. Use tweak to lower the temperature of the tiles in a circle and pump out the water, or do the whole cylinder and mine it out and quickly build the dome, re-freezing it every so often. It'll take forever but it'll leave no trace that there was ever anything but the dome there.

[Crossroads Inc.]

[please PLEASE e-mail the zip file of this location? PLEASE!