These systems work quite well at draining themselves. Remember, there is an emitter every few feet allowing the water to drain. Your real concern would be the mains and header lines. You can install manual drains at low points, like a simple gate valve. There are automatic drains available, too.

Thanks!

--Previous Message--
: Hello,
: I have a small orchard (approx 35 trees
: & some assorted berries). I would like
: to install a SDI system. I have read in many
: places that explain how to run a main line
: and then tap into it with emitter tubing and
: wrap around the tree. However I have found
: no information on whether this type of
: system will work if the ground freezes, and
: if it will what you have to do to drain
: these systems for the winter.
: