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[WJLIII3]

So, it seems to me that the dig restrictions on map edges will leave the source and empty tiles on the a brook frozen. Now, I have the source, so I can thaw that fully, but what do I do with the other end?

[ancistrus]

Could you ask that question in a more elaborated way? I am not sure what you mean.

In case you are in a freezing biome, with a brook that springs on your location, instead of flowing from outside the map and you want to use underground magma reservoir to make the whole thing flow like it is in a warm biome then i suggest  making fortification under the edge tiles and then using dfliquids to prevent the magma from spilling outside the map.

[WJLIII3]

My brook only freezes in the winter, but I want a waterworks, and for that I'll need perpetual water motion. My question is, how do I heat the very last row of brook tiles, the ones that drain the water out, so that it doesn't just become still water.

[Stoup]

So to clarify, the brook flows onto his map from one side but, since the other end of the brook where it exits the map is in a freeze-capable biome, during the winter the brook freezes on the output end and becomes still until the ice melts.

The answer is magma, of course. From what I understand of magma-thawing mechanics you'll want to place a small reservoir of magma just underneath the frozen brook, which should cease it from freezing altogether.

[blizzerd]

or just wall off the river just before where it freezes, and reroute to an exit off map that does not freeze

[WJLIII3]

but there's no digging edge squares, so how can I get magma under those edge river squares? Also, the river does not flow onto my map, it is born there, that's why the source isn't any trouble.

[billybobfred]

You could try putting the magma over the river instead. Dunno how well that'll work.

You can't build walls or floors too close to the edge, but apparently bridges are okay?

[Sphalerite]

You can't dig edge tiles, but you can smooth them and then carve fortifications in them.  This lets you drain liquid off the map anywhere there is a stone wall edge tile.

[Lectorog]

Divert the flow of the river down, into caverns, aquifer, etc. Along the way, make a passage for some water wheels. Underground water never freezes, so you can also just continuously keep some flow around there.

Also, try the Dwarven Water Reactor if you're not opposed to small exploits. That'll put an end to any waterworks problems.

[krenshala]

This makes me wonder how much water/how many water wheels would be needed to run a pump stack to combine a water reactor with a mist generator/water fall to have a self contained Perpetual Dwarven Happiness Generator.