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[WolfeyS]

I probably could just test this myself, but I'm trying to avoid fun right now as my fortress is having troubles. 

Would it be possible to drain this much water off map?
Also, why doesn't it already drain when it touches the edge naturally?

Spoiler (click to show/hide)

[Kogut]

It is filled through the edge.

[Sphalerite]

When there is a cavern lake that touches the edge when you embark, the edge tiles will act as infinite sources of water.  You can't drain the cavern lake without first blocking off the edge.  It's like trying to drain the ocean - possible, but takes some doing.

[WolfeyS]

Right thanks, this is going to take some time...

[Loud Whispers]

Right thanks, this is going to take some time...

It's easier with obsidianisation, caving in, pumps or draining the water down into another cavern layer / cistern

[WolfeyS]

Idea, so if I tap the infinate water source, have it drain down past 10000 trillion water wheels, and then off the map somewhere, I have infinately more power and infinately less FPS?  This might actually be a good thing.

[Blue_Dwarf]

What happens if we flood an area until it hits the map edge? Does it start generating more water?

[melphel]

Idea, so if I tap the infinate water source, have it drain down past 10000 trillion water wheels, and then off the map somewhere, I have infinately more power and infinately less FPS?  This might actually be a good thing.

You could do that, but what would you really use all that power for?  You can already create infinite power with water reactors, but there just aren't many applications for obscene quantities of power.  Slowing your FPS to a crawl is not worth it.

If you really want to drain that cavern lake, you can try building pumps to keep water from flowing into an area (make the moses effect) just long enough to wall off the water source on the edge tiles.  Then smooth and carve fortifications into the edge tiles somewhere else, and pump the remaining lake water off the map through that.

[WolfeyS]

Who said I needed that much power?  I just want it.

[Loud Whispers]

What happens if we flood an area until it hits the map edge? Does it start generating more water?

Nope, this is only on world gen/map embark, depending on the source. Think of a river source.

[Squirrelloid]

The best way to do it involves nuclear coal bins.  You know, a magma-proof bin containing !!coal!! which instantly vaporizes any water within 3 tiles of it.  Drop enough of those across the opening to 'block' it and you should get to watch the whole layer slowly drain - unless of course there's *another* source elsewhere.

[Loud Whispers]

The best way to do it involves nuclear coal bins.  You know, a magma-proof bin containing !!coal!! which instantly vaporizes any water within 3 tiles of it.  Drop enough of those across the opening to 'block' it and you should get to watch the whole layer slowly drain - unless of course there's *another* source elsewhere.

This is one of the most wasteful approaches.

Proceed.

[kaenneth]

That could make a good 'scenario' as an advanced play feature... an indestructable gear assembly at the edge of the map, your goal: provide 100000 Urists of power to it.

[Loud Whispers]

That could make a good 'scenario' as an advanced play feature... an indestructable gear assembly at the edge of the map, your goal: provide 100000 Urists of power to it.

NONONONONONONONOO!!!

Make it destructible - You'll have to protect it

[dr_random]

The best way to do it involves nuclear coal bins.  You know, a magma-proof bin containing !!coal!! which instantly vaporizes any water within 3 tiles of it.  Drop enough of those across the opening to 'block' it and you should get to watch the whole layer slowly drain - unless of course there's *another* source elsewhere.

Interesting, I am looking for ways to generate steam. How could I put !!coal!! into a bin? Would it incinerate inside the bin when doused with magma?