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[FengL0ng]

Hey there Folks!
I build three wells over my cystern in a mediterranean climate, so water will freeze in the winter.
Before building the wells I used a bridge as a roof for my lodging to save on materials but
sadly it seemed to not count as solid floor. So now the water tiles in my cystern have been
exposed to the outside and are now labled "above ground/inside". Although there are two bridges
and a solid floor now above the wells they are still freezing in the Winter, rendering them useless.

So my questions are:
- is it correct, that the "above ground" tag is causing it to freeze?
- can I remove this tag through some measure?
- is this tag propagated downwards? So if I build a lodging with a solid floor as roof outside where
the floor of the ground is labeled "above ground/inside" and I channel this floor, does the tile below
inherit this tag? Is this preventable?
Thank you for your time
-Feng

[PatrikLundell]

Once a tile has been exposed to the sky it will always remain exposed, regardless of what you do in game. You can of course use DFHack to change the flags (I'm not sure if there are scripts/plugins for that, but it's possible to write).

I believe it's the above ground property that causes outdoor temperatures to take effect (and allows you to grow surface crops).

I believe making a roof over your tile before you channel it should protect the channeled tile from the elements. As you've found out, drawbridges do not.

[h27kim]

Anything "above ground" freezes and anything that was once exposed to the surface, even if it is multiply roofed over, is "above ground"  (I believe people have even created "above ground hell" this way, I believe.)  There really is no way to counter this, I believe, short of turning off temperature, although a partial fix can be implemented via clever use of magma as with all things.  A "water heater" that prevents freezing of nearby water tiles can be created via a magma reservoir around the well, for example.

[h27kim]

roof does not protect from freezing.  once above ground, it will freeze, no matter how many roofs you have over it.

Once a tile has been exposed to the sky it will always remain exposed, regardless of what you do in game. You can of course use DFHack to change the flags (I'm not sure if there are scripts/plugins for that, but it's possible to write).

I believe it's the above ground property that causes outdoor temperatures to take effect (and allows you to grow surface crops).

I believe making a roof over your tile before you channel it should protect the channeled tile from the elements. As you've found out, drawbridges do not.

[FengL0ng]

So I basically can only create non-freezing wells on subterrainean tiles?

[Immortal-D]

So I basically can only create non-freezing wells on subterrainean tiles?

Correct.  When a tile is 'above ground', that status is permanent.

[PatrikLundell]

Anything "above ground" freezes and anything that was once exposed to the surface, even if it is multiply roofed over, is "above ground"  (I believe people have even created "above ground hell" this way, I believe.)  There really is no way to counter this, I believe, short of turning off temperature, although a partial fix can be implemented via clever use of magma as with all things.  A "water heater" that prevents freezing of nearby water tiles can be created via a magma reservoir around the well, for example.

If I understand it correctly, the well heater would have to be clever, because I think non flowing magma (not to be confused with magma flow which is something completely different) does not transfer heat, so you'd need to keep the magma moving (sloshing might be enough, but I wouldn't trust that without confirmation from a credible source).

[anewaname]

You could make a secondary cistern (just a 2-z pond) a short distance from your well, fill it from the well, and that will provide a replacement water source during the freezing months. Then start on that magma solution.