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[Goblins]

Is it possible to re-route a brook/stream and make it flow down underground a lot of Z levels? 

And a corollary to that question would be; Could I connect my dwarf-made stream to the edge of the map, thus making it have the same properties as a regular river?  Meaning it will not dry up or won't fill up my whole chamber.

If this is true... oh boy!  I have a lot of plans!

[BoogieMan]

You can flow liquids off the edge of the map indefinitely. If there isn't a natural open space on the edge of the map to use, you can't mine the outermost tiles but you can carve them into fortifications which allow liquids to pass through.

[Magistrum]

Since you are new to the game I recommend extreme caution with water, pressure exists.
If you connect your river to your man Dwarf-made stream the later can and most likely will overflow, just like if you had connected anything you plan to connect to it to the main river in the surface, but other than that, yes, it will gain the proprieties of a river, just remember that the river flows towards one direction, make sure to not dig near the start side.

[GhostDwemer]

Without using dfhack, you can't create new water source tiles, so you will have to use the existing source. But, as mentioned, you can create new "sink" tiles at the edge of the map by smoothing and fortifying. Also note that aquifers are infinite sources AND sinks for water. Finally, note that large areas of water (or magma) with less than 7/7 depth will murder your FPS.

[Goblins]

Okay this is giving me many ideas... but could you maybe show me how that might look?

[C27]

Since you are new to the game I recommend extreme caution with water, pressure exists.

Waterfalls are highly dangerous; dwarves can easily be washed away and swept to their deaths if you're not extra careful. Additionally, they often have trouble escaping water if they become submerged and don't know how to swim, even if a path is open that they could use. It might be prudent to use floodgates or raising bridges to get the aqueduct finished and clear, and make sure that nobody will be caught in the flow. Finally,make sure to do all you can to keep dwarves from trying to path through the running water after it's flowing.

[Aslandus]

Okay this is giving me many ideas... but could you maybe show me how that might look?

How an aqueduct would look? Or how fortifications on map edges would look? It's not that complex, but hard to pull off without sacrificing a miner until you understand water pressure...

There are loads of things you can do with water, especially flowing water, but be careful...

[Baffler]

Also note that you will not be able to fish from this river, only original water tiles can be fished from (provided there's still water in them when you're done.)

[tussock]

You should be able to make an underground river by dropping the surface via cave-in with the river already on it and just give it a prepared exit at (or below) the level it's going to stop at. Then cover 8 z's above the new surface with constructed walls from all the blocks you made when digging out a space for it (all the way back up to surface level) and it'll be fishable, grow some full-size cave trees and cave moss, assuming the river source can still flow in to keep it wet.

That may be fun enough that no one's ever done it, at least successfully, or at least without a lot of water ending up in interesting places. A biome that freezes the river for a long time in winter would make it a wee bit less drown-tastic.

[Findulidas]

Just a warning: waterfalls and such often drain a lot of fps and making your own rivers usually will as well.

[Pirate Santa]

Also note that you will not be able to fish from this river, only original water tiles can be fished from (provided there's still water in them when you're done.)

If I DfHacked new source tiles underground to create an underground river, would I be able to fish from that?

[Magistrum]

Yes, but in reality you can fish from anywhere anyway, make a pond, wait a bit and there will be some fish there.

[Goblins]

Wow, you guys post a lot faster than I would expect!  Not really used to such a... nice community.  I would like to say that most of my dwarfs are expendable.  I have five miners so far and so if one goes and dies... eh.  I'll just make my females pump some babies out.

This has never been done before?  That sort of makes the prospect of this a bit daunting.  Maybe once I get better gear/dwarfs and all that jazz I'll lead my dwarfs to terrifying inevitable deaths  mine that place out. 

Are you saying that I could essentially make an "underground Eden" that provides all the comforts of above?

[Aslandus]

You can make a completely underground fortress, and many do (you can grow plump helmets just as well 60 z levels down as you can 2 z levels down assuming you can find the soil). Miners might be expendable (mostly due to the apparent overpopulation of the mountainhome rather than the fertility of your lady dwarves given the 12 years it takes a child to mature), but picks might be harder to come by, depending on what metals you have.

[flame99]

You can make a completely underground fortress, and many do (you can grow plump helmets just as well 60 z levels down as you can 2 z levels down assuming you can find the soil). Miners might be expendable (mostly due to the apparent overpopulation of the mountainhome rather than the fertility of your lady dwarves given the 12 years it takes a child to mature), but picks might be harder to come by, depending on what metals you have.

Even finding soil isn't really necessary. I mean, if you're willing to make a massive underground river, I'd think you'd be willing to make a shaft for transporting water to a room for muddying it.