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[ResMar]

I dig out a channel for waterflow and barricade it with a door. Will it work?

[BlackFlyme]

It should, so long as you set it to forbidden/kept tightly closed so that nothing will try to open it.

[vastaghen12]

Yes they do. However, its more convinient to use bridges for controlling fluid movement, as they more efficient mechanism wise and will obilerate anything in their tiles, guaranteeing that no object will block your channel open.

[TripJack]

bridges also have the added plus of not being vulnerable to building destroyers

[ResMar]

A dwarf opens a door. How much water has to be on the tile before he's unable to close it again?

[BlackFlyme]

http://dwarffortresswiki.org/index.php/Door

"Doors destroy any fluid on their tile when they close."

If it is attached to a mechanism, it will be able to close no matter what once the lever shuts it, unless it is jammed or used by an invader.

[Laurin]

That's what floodgates are for. They can only be opened/closed using a lever.

[Larix]

I think a lever-linked door works almost exactly like a floodgate. It can only be opened/closed by operating the mechanism and blocks units and liquids. The main differences should be:
-wooden doors can be destroyed by some weak building destroyers, wooden floodgates presumably not.
-floodgates have an activation delay - the gate will only open/close 100 steps after the signal has been sent; doors react instantly.

When you're installing the 'plumbing' before the full structure has been built, doors offer the added advantage that your dwarfs can freely pass through them before they've been linked up.

[Rose]

Water will not prevent a door from closing, but a sock will. In my fort, I had double airlock doors to prevent accidents, and accidents happened anyway with me forgetting to keep them tightly closed.
Fun fact: even if there's nothing behind the door for dwarves the path towards, they will still open it to walk around somebody.

[UberFuber]

Water will not prevent a door from closing, but a sock will. In my fort, I had double airlock doors to prevent accidents, and accidents happened anyway with me forgetting to keep them tightly closed.
Fun fact: even if there's nothing behind the door for dwarves the path towards, they will still open it to walk around somebody.

Lesson Learned: Keep critical air-lock doors at least two tiles away from pathable routes.

[Rose]

That only matters if you don't lock it, like I forgot to do.

[WhimsyWink]

will a door in channel be placed at z-1?

[cdombroski]

will a door in channel be placed at z-1?

No, it will be placed exactly where you designate it. In addition, I'm pretty certain that a door over a channel will not stop liquids (or anything else) from going through as it doesn't stop vertical movement.

[Quietust]

will a door in channel be placed at z-1?

No, it will be placed exactly where you designate it. In addition, I'm pretty certain that a door over a channel will not stop liquids (or anything else) from going through as it doesn't stop vertical movement.

The only place in a channel where you could possibly place a door would be down inside it - you can't place it on top because you can't build doors over open space.

[ResMar]

Alright, good to know. I'm asking this because I'm building a complex pressurized above-ground cistern and need six piping channels (well...not really *need* I suppose), and don't want to deal with six floodgates and six levers for letting the miner escape after he punctures a hole if I could just make a door.