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[Loki]

I want a pressure plate to cause a floodgate to open when there's no water on it and close when any amount is. Is this doable with one plate or do I have to set up some not-gate shit?

[Untelligent]

Yep. Set the plate to activate at minimum depth 0 and max depth 0.

[Loki]

Yeah, that was the first thing I tried, with no result at first. I was expecting that as soon as they were hooked up, the flood gate would open right away, but it turns out that only happens after the plate gets wet and then dries off :/

[Urist Da Vinci]

Yeah, that was the first thing I tried, with no result at first. I was expecting that as soon as they were hooked up, the flood gate would open right away, but it turns out that only happens after the plate gets wet and then dries off :/

Hook a lever up to the floodgate, open the floodgate, and then dismantle the lever if you want it only controlled by water.

[Hans Lemurson]

Try using a raising-bridge instead, since they form a wall when receiving an "ON" signal.  Floodgates and Bridges have inverse behaviors in this regard which is of great use in dwarven computing.

[Girlinhat]

Designate a pond zone on the level above (if you can easily do this) and dump a bucket of water on the plate.  It'll trigger then.

[Jingles]

Don't disassemble the lever.  Pressure plates sometimes need to be reset.

[Marthnn]

Don't disassemble the lever.  Pressure plates sometimes need to be reset.

True.

I have a waterfall in my dining hall and statue garden. Under the 1x1 evacuation hole there is a 3x3 chute going down to the caverns... I plugged it because I ended up enjoying the caverns.
Now, 3z under the bottom room there is a floor with floodgates. 1z above that there's a hole in the wall with a pressure plate.
The pressure plate triggers at water depth 3 (or something like that), opening the floodgates. Water then falls down, triggering the close command and effectively destroying the water.

Yesterday, I had a cavern flood coming from the old chute. Water level rose and managed to fall down a remaining hole... because the pressure plate wasn't doing its job anymore (the slacker!). No idea why.

I had no lever linked to the floodgates, my bad, next time will be different. The resetting would have taken risky procedures like deconstructing flooded areas. I save-scummed to a not-so-far past, the problem didn't repeat itself.