Thinking I will go with 4" pvc. The small sizes of HDPE are hard to find locally although I did find 6". Perhaps 4" HDPE if I can find it. Sch 40 has less overall height due to no corrugations so I can get a little more coverage depth but it's not a huge amount. I can see the flexibility of HDPE being a plus. And the flow will be spread out a bit more with smaller pipes. On the fill if I don't do concrete what is the preferred type fill around it? One of the suppliers stated for the HDPE it should be non-compacting fill. I am guessing that means something like clean gravel? I am looking at installation info now and not familiar with fill classes 1, 2, 3, etc... I can probably put a foot or so between the pipes which seems better than close together.
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