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[Morpha]

So I've got a nice embark, not too happy about the river being stagnant due to the bug but I've been doing fine regardless. Was wondering about something though. I know if a tile is marked as stagnant it is permanently stagnant, but if I was to widen and deepen the river by one tile each direction after draining it then block the source tiles with bridges could I possibly reset the stagnant effect? Water does freeze during winter which will help, what about atom smashing, it removes contaminants after all. How is the game handling the source tiles regarding the stagnant effect (if the water spawner is indeed altered as opposed to the water output simply instantly being converted by surrounding water)?

[slothen]

the tile itself is contaminated.  Thus even if you drained the water and put in new clean water it would become contaminated as soon as it touched that tile.  I suspect even if you demolished the river bed entirely and build a free standing pool out of marble blocks, any water placed into that same place in space would become stagnant.

[khearn]

So if you dug a new channel, completely below the old channel (with appropriate drains so it can flow off the map edge below the old river channel), it sounds like the new channel would stay clean. Just make sure the water level never gets high enough to reach the level of the old bottom of the river.

Of course, while you're at it, you could also make it go someplace else if the old river didn't quite go exactly where you wanted.

[Garath]

the stagnant has spread to your source blocks. nothing will help

[Morpha]

Damn, was hoping something along the lines of what khearn said, but if the output water is automatically contaminated then I guess it's hopeless.

[Garath]

it's a known issue, very frustrating

[Ashsaber]

Captain Obvious says:

The only way to really -deal- with stagnant water:
DFHack's "liquids" function lets you remove stagnant flags on water tiles.

[Morpha]

Good to know.

[Saiko Kila]

Also, atom smashing doesn't really remove contaminants, at least in not all cases. I have smashers built into 5 wells, they smash the only tile accessible in each case. They do not remove contaminants like blood or vomit. Dwarves do clean it, after some time.

[Uristocrat]

You should be able to pump it into a cistern, so long as that cistern has never held stagnant water.  Just make sure the well is at least 2 tiles deep.

[Garath]

and the water from the pump NEVER contacts the river

[Sadrice]

Clearly you should dig a new river bed next to the old one and transfer it at the sources and exit with pumps, filling in the old river bed with obsidian.

[khearn]

And put up a sign saying:

WARNING!!
Stagnant Obsidian
Do Not Eat

[Saiko Kila]

Problem with stagnant water is that it can spread its stagnancy even without actual water - I have experienced it when digging a completely dry channel two z-levels under a brook. The miners started under a stagnant area, were moving more or less upstream, the stagnancy was propagating above them. If you prepare a separate, unconnected artificial riverbed and then pump water from original river then you should be fine, but no guarantee, thanks to that bugginess.