Dwarf Fortress Bug Tracker - Dwarf Fortress
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0009655Dwarf FortressWeatherpublic2016-03-23 20:332016-07-11 00:23
resolvedno change required 
0009655: Underground icing of a resivour
So i got this underground water resevour which the half the map freezes in autum, and the rest in winter, but i have an inside light Above ground well,
which just recently deconstructed when the water under the well froze, and it was either 7/7 or 6/7 water, and all my pumps which are under one massive roof froze too, except one
embark in df mode in a freezing river biome, make a resevour -1 z-level down under the surface, wait till winter, and watch as the well deconstructs when full
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has duplicate 0011636resolved Knight Otu Fortress layout changes after offloading site 
Issue History
2016-03-23 20:33djthekillerNew Issue
2016-03-24 00:34PatrikLundellNote Added: 0034914
2016-03-24 16:43djthekillerNote Added: 0034917
2016-03-24 16:44djthekillerNote Added: 0034918
2016-07-11 00:23LociStatusnew => resolved
2016-07-11 00:23LociResolutionopen => no change required
2016-07-11 00:23LociAssigned To => Loci
2020-10-15 04:43Knight OtuRelationship addedhas duplicate 0011636

2016-03-24 00:34   
It's as intended. Any tile exposed to light remains exposed even if roofed over. This means that the temperature will follow the surface one as well, and thus cause your once exposed reservoir tiles to freeze.
To avoid this problem, move the reservoir to a location that's truly underground, and, obviously, move the well as well.
2016-03-24 16:43   
2016-03-24 16:44   
just didn't know if it was a bug or not