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[Deathcrow]

Okeee, i started playing DF, but i guess i kinda suck

I had the "genius" *cough* idea to get water for irrigation (for farms) from underwater river. Luckily the floodgate i set in place is holding, buuuut of course the room that was supposed to become my farm is now completely flooded (7's all around).

Is there a way to throw something - from above ground - into the channel to close it and then maybe drain the water? I'd call it Operation "Top Kill" (too subtle? ^^).

Or is this area of my fortress now kinda damned forever?

[Eidako]

Can't you close the channel with your floodgate?

I'm guessing that you did this one z-level below ground? If so, you can quickly drain it with a screwpump. Have your carpenter make a corkscrew, pipe, and either your carpenter or mason make a block, give someone the architecture labor, build the pump directly above the flooded room, channel out the square at the passable light green end of the pump, then give someone the pumping labor and activate manually. They'll pump it out in no time; since it's outside and there's plenty of space, there's no danger from the water running on the surface, provided you don't do this right next to your main stairs.

edit: clarification on where to channel
_XX.

[K4el]

Okeee, i started playing DF, but i guess i kinda suck

I had the "genius" *cough* idea to get water for irrigation (for farms) from underwater river. Luckily the floodgate i set in place is holding, buuuut of course the room that was supposed to become my farm is now completely flooded (7's all around).

Is there a way to throw something - from above ground - into the channel to close it and then maybe drain the water? I'd call it Operation "Top Kill" (too subtle? ^^).

Or is this area of my fortress now kinda damned forever?

You can build a section of wall a few Z levels above the point you want to plug provided you clear out floors etc in the way. Using a support linked to a level you can drop this new wall into place and it will plug the hole.

Something like this:

Spoiler (click to show/hide)

 

x_____
x  - - - -I
x  - - [wall]
x
x



x = up down stairs
_____ = floor
I = support
- - - floors to be used only for constructing the wall section/support then removed

Screw pumps are a totally valid method too but this may be simpler depending on the situation. Screens would help us... help.

[Quadricwan]

I was under the impression that constructed walls broke down into their respective parts, rather then staying whole, when they collapse from above...

[Eidako]

I thought so too. AFAIK it's only natural walls which stay intact. I'll check.

Edit: verified, constructed walls deconstruct on collapse.

[Kza]

At least it's true in 40d for sure. I collapsed walls several times and had them break down.

[K4el]

regardless the principal will hold true if you're clever about using the natural walls above the leak.

[Astramancer]

Or, if you want to make the problem worse dwarfy, pump some magma over the leak and dribble it down, it will form an obsidian plug.

[Skorpion]

Pump the room empty to clear it.
Then, if water's welling up from a channel, stick a screw pump atop it to remove any water coming up, and wall around it.

If there's no flow entering the room, just deconstruct the door or dig a hole in the wall or something. Some flooding will happen lower down, but it'll evaporate.

[cdrcjsn]

If there's room, you can also dig 6 more identical floors underneath the room and poke up a corner with stairs (alternate corners).

Then you'll have 7 floors of farms!  You don't even need to use them all for farming.  Save some of the muddied floors for when you breach the deep caves and you can have your own safe place to harvest underground trees.