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[Gene GeRue <genegerue AT ruralize.com>]

> I've thought about wrapping some flexible pipe around a small stock tank,
> and running cold water through it to keep the temperature in the 40's F. I
> have gravity spring water, so no pump, but it's been awful dry around here
> and I don't have enough water to spare. I think 1/4 to 1/2 gallon a minute
> would provide sufficient flow to keep it cold.

Wow, Ted, where are you, Canada? That is some seriously cold water from 
your spring. Year-round ground temp, and therefore spring water, is about 
58 degrees in my zone 6a/6b part of the Ozarks.