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[Paralyzoid]

Sorry for posting a lot of questions here :/

I have a new fortress situated around a waterfall. For the entire year, the river's been stable. I dug a small area under and behind the waterfall, at (1 above) water level, for a water source that would instantly destroy vomit.

However, now it's late autumn. The upper river's just started to freeze. For some reason, the lower river has started to flood, even though no part of the lower river is frozen.

Why is this happening, and is there any pump-less method to prevent it?

[CaptainArchmage]

Sorry for posting a lot of questions here :/

I have a new fortress situated around a waterfall. For the entire year, the river's been stable. I dug a small area under and behind the waterfall, at (1 above) water level, for a water source that would instantly destroy vomit.

However, now it's late autumn. The upper river's just started to freeze. For some reason, the lower river has started to flood, even though no part of the lower river is frozen.

Why is this happening, and is there any pump-less method to prevent it?

What's happening is the non-frozen part probably is upstream, and the downstream part is no longer draining due to the ice. Therefor, the waterfall keeps adding water on top of the non-frozen water, that doesn't have anywhere else to drain...

Also a few screen caps would help diagnose your problem.

[Skorpion]

Sorry for posting a lot of questions here :/

I have a new fortress situated around a waterfall. For the entire year, the river's been stable. I dug a small area under and behind the waterfall, at (1 above) water level, for a water source that would instantly destroy vomit.

However, now it's late autumn. The upper river's just started to freeze. For some reason, the lower river has started to flood, even though no part of the lower river is frozen.

Why is this happening, and is there any pump-less method to prevent it?

Why?
Fluid pressure fuckery.

Pump-free method of fixing it?
Dig. Dig an overflow valve that flows into the caverns, or your well. Or use it as an obsidian farm. Build a damn that obstructs extra water flow but not regular flow, and use that to divert water into a hole. That hole can then flow anywhere, or just lead to a huge area to evaporate the water and leave you with mud.

Uses for all this water?
Inundation-based agriculture.
Obsidian farms.
A well.
Holding tank for water-based fun.
Swimming pool.

[Paralyzoid]

It's passed and it's summer now.

But I was confused because the ice dam is on top of the waterfall, and the flooding occurred at the bottom of the waterfall. I'd expect the bottom to run dry. Unless water can go up waterfalls now?