The idea is to have a stockpile tile, so dwarves automatically haul things there, that when the dwarves leave (pressure plate) the floor opens and chutes the stockpile's contents down to another stockpile, magma, inspection chamber, whatever...
The thing is... is not that easy... you can't place stockpiles on bridges, floor hatches, floor bars or floor grates, that as far as I know are the only floor tiles that could be open/closed on command...
I tried placing a stockpile on natural floor and channeling, dwarves won't dig....
on a constructed floor, you can deconstruct the floor, the stockpile contents will drop, but no new items will be hauled, and you can't construct bridges, hatches, bars or grates.... you're left with open space with an unusable stockpile on it...
I don't want a garbage zone over open space, because I don't want to constantly mark things for dumping, and claim them, I want an automatic chute....
So far the best idea I've come up is placing a stockpile, next to the chute, when the dwarf leaves a pump flushes the stockpile contents into the chute and down onto a floor grate to get rid of the water.... but that would deal with the bug of items disappearing when flushed...
it could work for certain purposes, like a vermin remains chute, where dwarves gather remains place them on the stockpile, when the stockpile gets full, it's flushed down to magma incinerator, or with unusable remains like nervous tissue, etc...
How really bad is the flushing bug anyway? has any !!science!! been done??
Any ideas??