On 5/02/2015 11:12 PM, Martin Koppenhoefer wrote:
2015-02-03 20:33 GMT+01:00 Paul Johnson <ba...@ursamundi.org <mailto:ba...@ursamundi.org>>:It seems like an above-ground tank would be more prone to freezing, not less. I have lived in two houses that had cisterns, although neither one was still in use. In this climate, yes,actually in all climates. What is varying is the depth you have to go to to avoid freezing in winter, or if it's permafrost you don't have to care because it will be always frozen anyway ;-)
Here you dig down to get out of the heat. And the depth, as you say, varies as does the stable temperature. The depth variation is probably due to the soil/moisture variation. One book I've read says that there is a phase variation - if you pick the right depth you can have warmer in winter and cooler in summer.
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