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[Hyndis]

So, we all know you can't construct walls to the edge of the map, nor can you mine/channel out that last tile.

However, you can smooth the wall and carve it into a fortification. 


However, this seems to have very wonky results. Lots of interesting potential, but weird stuff also happens.

For the first fortress, I dug out exits for water and magma. The water drained away quite rapidly. However, the magma did not. Then I made another map to test out on the edge of the ocean to try to drain the ocean. Well, after breaching the edge of the map with fortifications, I was actually getting water flowing in!

However I was not able to do further experimentation with this, as all of my dwarves were working in the tunnel and drowned when it suddenly flooded. I'm unsure if it matters, but that map tile biome had an aquifer in it, though I dug down to the lowest level on the map, through solid granite, to reach the edge of the map.

Anyone else have experience with this?

[Vampire Penguin]

Woah, this definitely seems useful. Thanks for the tip (even though Toady will probably fix it next release).

[Walliard]

...

*jaw drops*

[Untelligent]

One of the greatest Fortress Mode discoveries in a long time.

*thumbs up*

[dood_]

But if you have an area of an odd size, lets say 7x4 or something, then enemies can spawn inside the 'correct' area, so say 4x4. Still very useful though. Like, very very useful.

[Mcshay]

I can independently confirm that, on a map with no aquifer, map-edge fortifications will drain water rapidly. It took less than a second for a single fortification to empty effectively 52 units of water (9 tiles reservoir minus all surfaces covered with 1/7 by the end).

[Derakon]

At last! Chasms on any map! Very nice.

[Mcshay]

This could probably act like a garbage disposal too, since things have a tendency to teleport through fortifications when being moved by liquid.

[Shad0wyone]

You are a true dwarven genius!

[Hyndis]

However, the behavior of these fortifications isn't entirely predictable. Or perhaps my sample size was too small.

On a non-aquifer map, I was able to run water off the edge without any trouble. On this same non-aquifer map, I was not able to do the same with magma, which was unusual.

Also, on a map with an aquifer in the biome, even though I dug way down below the aquifer, my tunnel actually began to flood after breaching the edge of the map.


Anyone done any research on this? My DF time as of late has been rather limited due to my workload, but at least I'm getting overtime in this economy.

[AncientEnemy]

it's not such a mystery with magma. magma will not flow off the edge of a map even on the surface. water will. just seeing the same behavior in a new place.

[Hyndis]

Huh, didn't know that. I thought magma was a liquid just like water, and thus would flow off the edge of the map. I never actually tried sending water off the edge of the map until my current fort, because I had to have magma flowing to keep the river liquid.

I embarked in a freezing biome, and while I had a magma river under the water river, so it would heat up and keep it from freezing over, it only worked if the magma was moving. If the magma was 7/7, then the river would freeze until the magma moved again.

[Mcshay]

Huh, didn't know that. I thought magma was a liquid just like water, and thus would flow off the edge of the map. I never actually tried sending water off the edge of the map until my current fort, because I had to have magma flowing to keep the river liquid.

I embarked in a freezing biome, and while I had a magma river under the water river, so it would heat up and keep it from freezing over, it only worked if the magma was moving. If the magma was 7/7, then the river would freeze until the magma moved again.

Wow that's weird. I guess rivers are handled differently than sitting water (ie: glaciers)?