"The Natural Philosopher" wrote in message
...

Oh, its *way* better. Slinkies are relative crap by the way, long pipes
laid in flat loops are way better.

That is what a slinkie is.

But any trenches dug below local water table would likely be very
effective as well.. The river would serve to keep the soil wet and
conductive.

Until it freezes then you may have to reverse the heat pump to thaw it.