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[ousire]

ok, im working on a flooding trap to help get rid of seiges (and maybe elves? ) and i need a few details i am unsure about to be sure that i wont flood my fort inadvertantly when i build this thing.

here is the layout so far, sorry if i have it completly wrong

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WWWWWWWWW       W = wall
W       W       - = channel
W      -W       P = pressure plate
W      -WWW     D = door
D      P D
W     --WWW
W     -PDXW
WWWWWWWWWWW

ok, the idea is that our merry band of gobbos march into the room, one of them steps on the plate in the middle, and that locks em all in. the plate also starts water to flood the room up completly. once the room reacheds 7/7 water, that triggers the plate surrounded buy the channels which opens that other door to the pump, which should suck the water back out of the room. am i right so far?

the questions i have are how do i open the doors again, so that the next batch of gobbos can come to their doooooom? i thought of having a plate triggered by 0/7 water, so that once the room is dry again it opens the doors. would this conflict with the other plate that locks the doors? if it does, what do i do? (note: i was hoping to have this automated, no dwarf lever pulling or anything)


comments/ideas/corrections all welcome! 

[Jurph]

I think your best bet is to have an ARM / DISARM interlock somewhere in the chain, and to make the pit two z-levels deep.  I'd place a floodgate downstream from the incoming pump, and then have a (3/7) depth-checking pressure plate on the second z-level.  The sequence of operations would be:

1) ARM the trap manually: floodgate that blocks the pump opens up on Z+2.
2) Goblins attack and one of them steps on the pressure plate (on Z+1), opening the other door that releases the pump flow.
3) Water starts to flood in from the pump on Z+2
4) Water fills Z+1 to 7/7, goblins start to drown
5) Water level rises and begins filling Z+2.
6) Water level on Z+2 reaches 3/7 and triggers pressure plate, drain gate on Z+1 opens.
7) Now is a good time to DISARM the trap manually and close the seal on the flooding pump.
8 ) Always-on pump in the drain cistern (probably at Z=0) pumps water back into the flooding pump's reservoir.
9) When the water level is low enough, the pressure plate closes the other pump seal. 
10) When that seal closes, manually re-ARM the trap.

[ousire]

so i have the plate seal off the doors to trap them in and it also opens my holding tank above to flood them.
right above the room i have a plate set for 3/7 water and that one closes the gate above and opens the door so that the pumps bring the water back into the holding tank
so how do i unlock the doors for the next set of goblins?

what if i have the holding tank 2 zlevels deep as well, have the plate by the door only let in water, and have the 2nd zlevel of the water tank have a plate to lock the doors at say 0/7-6/7 water, so that the second the water leaves, it makes the doors lock, and once the water is filled back up again it unlocks them?

[Samus1111111]

also, if possible I would make the chamber longer to accommodate the fact that sieges spread themselves out as they move toward your fortress.

[ousire]

it would be easy to scale the room up as much as nessicary or to move the doors further down the halls to catch more gobbos. just gotta make sure theres enough water for them to all get dipped. also might want more pumps in that case so the extra water volume is delt with a bit faster

[ousire]

one quick question im not sure about for the pumps: pumps are two tiles large, and they take water from one tile and put it in the other? or do the take from next to/below the input tile and put out above the exit tile?

[i2amroy]

They take it from the tile below the input and put it out on the tile next to the output. If you could look at a pump from the side, it would look like this

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_|with the _ being the input/standable tile, and the | being the output/non-water-permeable tile. The pump takes the water from the tile below the space next to the input,

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X _|
X~XXX_| = pump
~ = water
X = wall

and places is in the tile next to the wall part of the pump

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X _|~
X XXX