Hi,

I guess it depends - in some areas the sprays might be more suitable. You
prevent the pipes from twisting by using u-shaped metal pins to hold them in
place.

You have to keep the pipes above ground - if there is a leak - you want to
know where it is.

Here's an idea though - how about using large PVC pipes - drilling holes
into them - burying them into the ground - and connecting them to the water
supply with a turn off switch (in case of heavy rain).

The idea is that the PVC pipes will slowly leak out the water - and they are
fairly large and not easy to damage.