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[Five chickens]

I'm wondering if I have to worry about kids running through a wall grate and into the river.  (They like to play in an area I use for water drainage.)

[Dunamisdeos]

They can't fit through the bars for being small, or anything like that.

It blocks pathing unless moved or destroyed. Blob-type creatures can blubbablub right on through fortifications, but I think that only applies if underwater? Not sure.

[mightymushroom]

They cannot path into the wall grate tile as long as it remains in the closed state. However, the (somewhat buggy) way that DF handles things that are pushed by flowing water means that there is a chance they can be accidentally washed into or through that tile if they are in the area while you use it for drainage.

Fortifications are programmed differently, and it's well documented that with 7/7 water anything that swims can swim through. (Opinions vary on whether this is bug or intended.) And they are also subject to the pushing thing even when the water isn't so deep.

To the best of my knowledge, children and other valuables will not be washed through a floor grate if you can possibly amend your plans to include one.

[Five chickens]

Can an object get stuck in a floodgate and prevent it from closing?  Thank you for the responses so far.

[clockwork]

Can an object get stuck in a floodgate and prevent it from closing?  Thank you for the responses so far.

No

[PatrikLundell]

Can an object get stuck in a floodgate and prevent it from closing?  Thank you for the responses so far.

No

Well, it depends on what you mean by "stuck". Floodgates and doors can be blocked from closing by any object or creature in the tile (including a seed: size doesn't matter). Drawbridges smash the objects, and so can't be blocked by items (but can be by some creatures).

[Fleeting Frames]

On this note, doors get stuck open when there's an item in the way and have to get another close signal to close; floodgates close as soon as there is no blockage, once they've been told to close.

You can always link the wall grate to the lever or pressure plate if you think you may need to open it to retrive a child.

[evilDagmar]

To the best of my knowledge, children and other valuables will not be washed through a floor grate if you can possibly amend your plans to include one.

One of my standard "cheap tricks" is a central column through the fortress where I've got no less than eight (because trying to do it with fewer than this makes splitting up the water very finicky) sets of floor grates around the four central stairwells creating a series of waterfalls that they've no choice but to be exposed to repeatedly (that is, if they want to ever move from floor to floor).  I'd have surely seen socks and idiots piling up in the collection pool twenty levels down by now if they could be washed through a grate.

(Remember, a moist dwarf is a happy dwarf!)

[Five chickens]

Do you build those directly next to the stairs?  And do your dwarves ever get knocked down the stairwell?

[evilDagmar]

Well, if you could make stairs out of grates I'd be doing that because 1-deep water falling on them is about the equivalent of getting caught in the rain, but no, they're not forced to walk through the falling water(falls *ahem*) (although they can if they want to).  This just generates a reasonable amount of mist in areas where they're going to regularly visit.

	#		#
#	X		X	#
		S
#	X		X	#
	#		#

(Some extra art exposure never hurts)

If you like you can alternate between up-stairs and down-stairs at each corner, but in practice this just seems to add travel time.  Just know that unless you split the single square of depressurized water eight ways, you run an unaccepable risk of water being 2-deep which can knock dwarves over.

Oh, and in case this doesn't seem obvious, this is now greywater meaning it does not go into a cistern to supply a well.  ...not unless you want epidemics of poisoning and occasionally vampirism.

[Fleeting Frames]

You can build grates and hatches directly on stairs, but that's about it for "building stairs out of grates".