Higgy,
I am guessing he used PVC because he could find it easily (one of his criteria). Rain water isn't going to hurt plastic (hopefully). Not sure on the differences.
Tango Charlie,
What kind of valving are you in need of? I would think you could find PVC plumbing valves that would do the job quite nicely. I have seen PVC ball valves for simple "ON/OFF" operation. Do you need something more sophisticated? A major advantage of using what exists is that you don't have to make it yourself.
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