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[whitecold]

My current embark features a 15 lvl waterfall dropping into a small river. Somehow the whole lower river has become stagnant water and part of the upper river, resulting in water not draining properly but instead flooding the surrounding lower landscape. . My FPS is now suffering, and my planned fortress entrance is submerged. Is there any way to get the River flowing again? I tried purging the stagnant water with DFhack, but it just reappears. Also, is there a way to prevent rivers from becoming stagnant?

[Kogut]

A known bug, AFAIK without workaround except DFHack. See http://www.bay12games.com/dwarves/mantisbt/view.php?id=5232

[Moonshine Fox]

If any body of water comes in contact with salt or stagnant water, that entire body of water instantly becomes salt and/or stagnant. Known, and very annoying bug.

[Xebeth]

Strange, my current fortress has a river with a waterfall which is only partly salty.

[peskyninja]

Water doesn't flow in a waterfall, it falls in chunks. That can stop the upper part from becoming salty/stagnant.

[Xebeth]

Water doesn't flow in a waterfall, it falls in chunks. That can stop the upper part from becoming salty/stagnant.

This is before the waterfall.

[ydaraishy]

If any body of water comes in contact with salt or stagnant water, that entire body of water instantly becomes salt and/or stagnant. Known, and very annoying bug.

Even worse might be the fact that rivers that share a wall with a body of stagnant water get contaminated. 

Also, if a river contaminated in one part freezes then unfreezes, all of it is stagnant.

[Kijiro]

Can someone explain how to use dfhack to get rid of stagnant water? I downloaded it but I'm not sure which command would work the best.

[dree12]

AFAIK stagnant rivers should still absorb water, though this might be incorrect. If there is an aquifer on your site anywhere, channeling the river into an aquifer may help. Otherwise, try diverting the river: carve fortifications on the edge of the map and channel a path from the upper or lower river to the fortifications. This should reinstate the pressure effects that usually let rivers absorb water.

[GhostDwemer]

Yeah, water not draining right is a different bug than the stagnation issue. Stagnation is simply a contaminant like salt and has nothing to do with the flow of the river. Easy to see how you would think one had something to do with the other, though.

[PsychicKid]

Can someone explain how to use dfhack to get rid of stagnant water? I downloaded it but I'm not sure which command would work the best.

Go into the Liquids menu and find the method to Fill an entire area with water. I think it also has something to do with Clean, I've not done it in a while. Just re-fill all of the murky pools touching the River with fresh water, then do the same with the river.

[Xebeth]

... Otherwise, try diverting the river: carve fortifications on the edge of the map and channel a path from the upper or lower river to the fortifications...

Stupid question, but how do you do that? The game won't let me touch the tiles on the border of the map.

[AWdeV]

You dig right up to the edge, leaving that last wall standing there. This only works with stone by the way.

Then you smooth that stone wall d-s and then carve fortifications in them d-a, if I'm not mistaken. This way you can let the water flow off.

[Xebeth]

Ah I see. It won't work for me unless maybe I dig down to the stone (the first layer is sand and the two layers below are clay)... Anyway thanks that's good to know.

[AWdeV]

Just dig down a few floors, it only increases your capacity. I had the same for a magma-outlet once. Was stone where I had the stuff flooding in but I tried to dig a way out. Went through yellow sand, so I dug down, more sand. Dug down further untill I had three floors of stone on top of each other then I carved fortification in all three of those. It worked splendidly for getting rid of the stuff.