russm, really glad you posted, been thinking of using PVC my self as where I live at the moment could be more temporary than I'd like. You say you haven't had problems with movement?? What region of the country are you in and how long has this section been standing? I have winter to contend with and my fear is freezing and breakage of pipes or weakening them with drain holes. I guess a foot or so of gravel in the bottom of the hole would take care of drain problems,.. but then so would simply capping the up rights I guess...... sorry....been think typing again ...S.B.