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[Anjey aka PM]

If I have a screw pump underwater (including accessible cell) what will happen if water freeze in winter. Also if pump will be stopped will it block entire system? Can I have central power plant for underground and aboveground portions of my water system or I should separate 'em to avoid underground system part blockage?

Thx for help

[umiman]

Mrm... so many questions at once.

I don't know what you mean by underwater, since you obviously can't build UNDERwater as your dwarves currently don't know how to construct while diving without drowning.

If you have an underground lake or an underground water source, you can build a pump station there and nothing will happen during winter since water sources only freeze in winter if it's labelled outside.

If that pump is blocked (I assume by the ice freezing), it would depend on how complicated your system is. If you have more than one pump and one isn't frozen, then everything should be good. But for most people and most systems who aren't insane building 20000 safeguards on their water systems, yeah, your water system will halt.

If your "powerplant" is big enough, you could use just one to power your whole fortress. Provided you can build one big enough, that is. Most people normally just build power when they need it since it's much easier and simpler that way.

I have come across a strange bug where eventhough the water is labelled inside and subterranean, it still freezes in winter. So... I dunno.

[Anjey aka PM]

Ok! try to explain more clearly

1. I've built a pump outside
2. I've connected the pump to central (10k Horse Power Units) power plant.
3. I've opened floodgate and pump is flooded with water (not only level below but also a Cell where Pump operator supposed to be) due to water pressure.
4. Winter came water freeze.

Two questions:
1. Will pump freeze or simply continue pumping air?
2. IF pump will freeze will it block entire power plant or not? (as described above entire fort is powered by one huge power plant).

Thanx for help

[umiman]

yes for both questions.

You could try building a perpetual motion power generator to avoid that (or use windmills)
http://www.dwarffortresswiki.net/index.php/Waterwheel

It's complicated at first. But once you understand it, wow! Everything becomes so clear and yet... totally illogical.