6" PVC sch 40 or HDPE N-12 can carry more weight?

   / 6" PVC sch 40 or HDPE N-12 can carry more weight? #11  
Definitely go for the bigger pipe as others have said. It's generally self-cleaning, unlike 4-6" pipe which will be plugged in no time from any plant material & other stuff in the area.
 
   / 6" PVC sch 40 or HDPE N-12 can carry more weight? #12  
A couple of my doublewall 14's have about 6" of cover and they get tandem axle dump trucks over them.
 

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