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[wlmartin]

I have the premise of the trap in my head (a room that fills with water and expels the water when done)

But to make this work, how can I create a floodgate in the floor?

[bluephoenix]

You can't put a floodgate in the floor, you have to use a lever operated floor hatch.

[wlmartin]

I don't want to do that... for reasons

Basically I want my bad guys to drop a tile, land in a normal room, i flood it, i empty it.
However if I create a floor hatch I will also drop the body and I can't loot it.

Ideally I need a grate that opens/closes somehow.

[Pancakes]

Build a floor grate, preferably one that is the product of a strange mood (as to prevent building destroyers from breaking it), and then on the next level down, build a floodgate

Code: [Select]

....#....
...._X___(Drains)
.........

Where . = wall, _= open floor, X = floodgate, and # = floor grate

[wlmartin]

Build a floor grate, preferably one that is the product of a strange mood (as to prevent building destroyers from breaking it), and then on the next level down, build a floodgate

Code: [Select]

....#....
...._X___(Drains)
.........

Where . = wall, _= open floor, X = floodgate, and # = floor grate

Yeah i was thinking that as well, just was thinking about it backward (floodgate on top of grate instead of your suggestion)

/facepalm

Cool, looks interesting... now to try and build it 100 times before i get it right and then realize that once I have the preset conditions and scenario to deploy it, i might as well have just used a spike trap

[BoredVirulence]

...preferably one that is the product of a strange mood (as to prevent building destroyers from breaking it)...

For the record, building destroyers can still deconstruct it. They can't destroy it, but they can deconstruct it.

For stuff like this, I would have a timed retracting bridge with a floor of grates under it. The bridge should also mean no mud, and no plants.

[SeelenJägerTee]

Just pump the water out from above through a floor grate.
As long as the building destroyer can't path to the floor grate he can't destroy/deconstruct it.

[BoredVirulence]

Just pump the water out from above through a floor grate.
As long as the building destroyer can't path to the floor grate he can't destroy/deconstruct it.

That would work too. I'd use a few pumps dispersed evenly through the hall so you don't have to deal with too much evaporation. It would likely require more power (or useless idling dwarves), but would have less complexity than timed retracting drawbridges. You also don't have to worry about the possibility that something doesn't drown, and the bridge either won't open (too large a creature) or drops an enemy into part of your fortress (the collection area).

I had a similar trap, it was intended to push building destroyers down a pit, and the bridge would close and trap them there. It had a failsafe, if the bridge couldn't retract then it would stay sealed until I could pump magma in to obsidianize it.

if you have a 3 tile wide hallway, you may be able to perform a similar setup.

Spoiler (click to show/hide)

Code: [Select]

Side view:
------------------------------------
Z5 -    ║~◄%  ║
Z4 -    ║~║~~~║
Z4 -    ║~║~~~║
Z3 -    ║#╠╬╬╬╣
Z2 -  ◄%  ║ ◄%
Z1 - ║≈║___╠╬╣≈≈≈║
Z0 - ║≈≈≈≈≈≈≈≈≈≈≈║
------------------------------------
Legend:
------------------------------------
Wall:         ║╠╬╣
Pump:         ◄%    - Pumps west, includes a grate where necessary
Floor:        __
Water:        ≈
Magma:        ~
Floodgate:    #    - Happens to have magma on top
On Z1 we have two pumps, one that acts as a "vacuum" and another that supplies the water. They link back to the same reservoir, but that's optional. Note that the supply pump on the east side has a wall between it and the room, this diagonal should cut off pressure and stop the water from rising too high. There are other methods to control the height if this fails. Z3-Z5 is a measured magma reservoir that can be dropped whenever needed. It should supply just enough magma to obsidianize the bottom 3 floor tiles. This simple design can be expanded for each tile in length that the hall needs to, but is pump heavy. Further optimization could occur, but it will likely depend on the length of the hallway.

Also, I'd like to note that its possible the water supply pump's pressure release would still cause the water to rise up to Z2, which will cause for incomplete obsidianization. If this happens I suggest using a similar method to measure the amount of water to release, similar as to whats done with the magma.

This way, if something decides not to drown, you can still eliminate it, and get some obsidian in the process.

[vjek]

You could adapt something like this design.

All you need to make it work is an aquifer, instead of the magma sea.  And of course the aquifer is a source of infinite power , as in (M)achine power, not... ultimate mwahahah power.

I've gone the route of fluid drowning chambers with logic circuits (water & gear, both styles), retracting bridges, snorkel sensors, reservoirs, massive drainage arrangements, soft seals, hard seals, etc, etc.  It can be done, but there are simpler designs, depending on your goals.