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[InsanityPrelude]

Alright, I'm embarking after my ocean fort got pwned by orcs.

Ancientstakes is on the edge of a tropical lake. I didn't bring much food or drink. I have magma. I have flux. I have a bunch of tapirs in the river. I have carp.

Just how badly is this likely to end? 

[Simmura McCrea]

I give you until the first orc siege.

[Wraithsight]

Do you have and aquifer? If yes, then horribly.

[InsanityPrelude]

Yep, there's an aquifer (on the level with sand, which is annoying because I want to set up a glass furnace), but there's also an area of marble I plan to go down through.

[Grendus]

It miiight not end in death if you take the right precautions. Presuming there's no aquifer beneath the marble, you can dig a fort through there. Booze production is set up ridiculously fast. Walls can repel even a megabeast. Carp cannot kill dwarves who avoid their rivers, so long as your dwarves don't run out of booze they will live.

[saihenjin]

Also, make a well ASAP from one of those aquifers or any water source. Injured dwarves need water, not booze, and if your guys are running back and forth to the nearest carp trap to get water for Urist McScratchedThumb then it's not gonna go well.

[Ultra-Towerdude]

Make your own pond to your fisherdwarf(if any). Like, make a hole, channel some water in it and hope the carps don't see it.

[Porpoisepower]

The marble may still be aquiferous.

Howeve you should be able to punch through the aquifer next to the magma.  Most levels of quifer's have a few squares of dry space arround Magma. That will get you by until you can get pumps / controlled Caveins through where you really want to be.

[Neoskel]

The marble may still be aquiferous.

Only a handful of stones in vanilla can have aquifers. Conglomerate, sandstone and..*checks*...nothing else. Certainly not marble.

[InsanityPrelude]

The marble's not wet, and it makes a good dining room.

Autumn of Year 2 and... nothing, yet, except a hunter managing to drown himself in a murky pool somehow. Even the fire imps haven't been a problem (the aquifer's making it a bitch and a half to channel magma towards the main fort, and my brilliant plan in that regard failed hard.)

Maybe I overdid it when I was trying to tweak the orcs so they wouldn't siege in the first year.

[Glacial Eidolon]

Is it possible to cave in rivers, sending them down z-levels? Also, is it possible to channel out the bottom z-level, creating mini-chasms? To potentially remove the river from existence?

If so, then your path is clear. You know what you must do.

I'd really like to see a movie with that in it.

[Slogo]

I've never tried it but I think the section of the river would just collapse then water would flow into the basin you created. You can't collapse the edge tiles of a river as it would require carving fortifications into the base of the river on the edge of the map. The same would actually apply to any part of the river unless you build a dam first.

[Quietust]

Also, is it possible to channel out the bottom z-level, creating mini-chasms?

No, it is not possible, as the game will not allow you to place any designation that would remove the floor from the bottom Z-level - this includes channels, downward stairways, and up/down stairways.

[Glacial Eidolon]

Ah, I see.

There goes one great idea...

[Vampire Penguin]

Ah, I see.

There goes one great idea...

You can still smooth and carve fortifications on the edge of the map to drain water. Not magma, though.