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[mnjiman]

Water cannon possible?

if water can go diagonally, you could have several pumps pumping in a single tile,

Then all of a sudden, open flood gate.

BAM. Blast of water.

[dwarfguy2]

this, and magma, are well in use for many purposes. there's a search tool.

[Hyndis]

Yes and it can be an extremely effective weapon against anything that needs to breath air.

Easy way is to just build a gigantic cistern. Fill it with a pump stack from a brook. You can put windmills on the top of the cistern for power. At the base of the cistern (which is above ground) put a retracting bridge. You will also need a drawbridge to seal up the entrance of your fort so you don't also flood the fort. As both bridge types have the same delay you can link them to the same lever.

Throw the lever and you will flood the world. The water will of course drain off, but it will take long enough that everything not within your fortress will have drowned.

[Shoku]

If you want something with a little more precision, like for throwing invaders around, you need to know the difference between pressure and flow. Only flow moves items and units around. It is easiest to understand if you have had liquid as numbers on already- the bunches of 6's dancing around amidst 7's is flow. The ways to get pressure are with pumps or water resting on top of a 7/7 tiles of water. In this case a square of water will search for the nearest open space connected to the body of liquid and then teleport there, which is why this doesn't move units around.

So this makes pushing units around kind of a pain. Water spreads really slowly without the pressure effect so what you need to do is unleash it down ramps. With a long series of ramps leading to your entrance you could have a whole army marching up it when you unleash the flood to sweep them into a pit somewhere, possibly where the fall kills them.

[b1gb0y2013]

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            ____    ________          = A dwarven Waterslide                   
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[TheDarkEnigma]

I also noticed a change in water mechanics in the new version... water doesn't flow up when pumped into a full reservoir, meaning it's harder for it to spill out and flood everything.

Anyway, that waterslide thing looks awesome. I'm gonna go try it next time I find a river!

[Shoku]

It never flowed up. Even with pumps it would only go up to the height of the pump (without pumps it will go to one level below the highest water.)

We've always had to make pump stacks to get water/magma up great heights.

[Hyndis]

Build the pump stack to the top of the reservoir. The level of the top pump will the the level of the water once it is full. Then hook the pump stack up to windmills or dwarven water reactors. If its on the surface its probably easier to use windmills because you're already building a huge structure on the surface anyways. Just stick some windmills on the top. Then pump water from a brook, river, or aquifer into the reservoir.

If there are any invaders on the map pull the lever to drown them all. Depending on the size of the flood and the source of the water reloading the reservoir may take a long time. The solution to this is of course obvious. Build more pumps! 

[Shoku]

If you want a magma flood you can speed things up greatly by having several pumps well away from the pump stack that feed it. Magma flows tend to get very slow from the big depression pumps make and how flow can't easily fill it. With water this is less of an issue because of natural pressure, though there would still be ways you could set up a pump stack that would end up being quite slow.

[Hyndis]

If you want a magma flood you can speed things up greatly by having several pumps well away from the pump stack that feed it. Magma flows tend to get very slow from the big depression pumps make and how flow can't easily fill it. With water this is less of an issue because of natural pressure, though there would still be ways you could set up a pump stack that would end up being quite slow.

Most brooks are 4 tiles wide. You can build a pump stack 4 pumps wide to soak up all of the water of the brook and dump it into a giant above ground reservoir. On the walls on the top of the reservoir put windmills to power your pump stack. You probably only need a few Z levels of water. If your embark space is 4x4, create a reservoir that takes up about a 3x3 space. Make the reservoir be 5-6 Z levels deep and that is plenty. When you pull the lever the entire world will be flooded long enough to drown everything, and due to water pressure nothing will be able to escape.

Using an entire brook to refill it should greatly speed up the process but it will still probably take a couple seasons to refill entirely.