Stormin Mormon wrote:
First thing comes to mind, is sunlight and the UV rays. So,
what you use should be UV resistant.

White PVC tubing might work for a while. The cost of
fittings might add up. Typically sold in 10 foot lengths,
and the tubing is relatively rigid.

White PVC will be weakened by UV. Works great buried.


The new "Pex" stuff they sell for indoor water tubing may
work, but not sure how UV resistant it is.

Most Pex is easily damaged by UV.


They also sell some grey tubing for electrical conduit,
which might be more UV resistant, but not sure it's used for
outdoor water.

It's not rated for that.

Which brings us back to black poly pipe.


As to winter, may be able to to blow it out with compressed
air, and leave it dry.

OR install drain valves in the low spots.