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[Rigel]

So I embarked on a temperate region that had two springs and an additional river, everything was frozen at the beginning before the eventual thawing. Once that happened the lower end of the river didn't seem to be able to drain away the water sufficiently fast and now in mid summer I've got a steadily growing lake in what used to be a valley. The water level is still some 5 z-levels from the initial embarkement spot and the volume of the would be megalake being enourmous there's no way it will reach it for years to come. However, since I don't expect this to be convenient to my FPS in the long run I was wondering what could be done to get the river flowing neatly. I'm not sure what exactly is the problem here, but going out on a limb here I'd say there's more incoming water due to one of the springs entering the river than what can flow out (the other spring flows to a different exit point alltogether). So just to give a quick sketch of the map:

Spoiler (click to show/hide)

Noticeably the river enters from the northwest and drops as a waterfall to the level of the spring in the middle, then the combined water flows to the south flooding the southwest corner of the map.

So how to end this deluge? I guess I could try damming the river before it hits the waterfall or damm the spring before it gets to the river but I was kinda hoping for finding a way to set the drainage appropriate, probably when it's all frozen again - if there's a way to influence the drainage that is, the tiles at the edge don't seem to be different from any others in the exit point of the river, just the entry points are clearly labeled as water sources. Any ideas?

[Tsuchigumo550]

Either wait for a freeze and wall off as much as you can, find a place to drain like an aquifer or off-the-map, or use DFHack.

[shadowclasper]

I don't see why you're so miffed... during winter the top layer should freeze over, and then everything under it should spill out I -think- but I could be wrong.

Alternatively, dig down to the cavern layer ASAP and begin draining the lake down into it.

[Tsuchigumo550]

Douse the fires of hell, or have the best swimming pool ever. Actually, fill it with loot. Dump goblin sacrifices into it. Go as an adventurer to see the mystical lake. Spread the save around on DFFD to let the crazy engineers go wild. The world is your oyster.

I do kinda want to see this first hand, which is why I mention the save.

[Rigel]

Well, first winter just took over and the pool turned into something that looks decent for a dwarven hockey game.

Spoiler (click to show/hide)

I was checking every now and then how fast it expanded and I think it didn't grow for the last few months so apparantly it reached equilibrium, though I'm not sure what exactly contributed to that (is that a large enough area to have significant evaporation when the depth steadily decreases outward from the rivermouth? also there are around 50-60 tiles of the pool that reach the map edge but I can't tell just be the variation of depth if it really drains anything). Anyways, it seems clear that the apocalypse moved on to another day, I'm still wondering though what the heck to do with that puny pond of puke.