My NRCS design calls for a 120' length of 6 inch pipe sloping down through the dam. It specifics 3/16 wall welded steel pipe, but then they also attached Code 378.

Code 378 states it can be made of corrugated metal pipe, PVC 1120/1220, PVC C900, or welded steel. My initial thought would be welded steel would be best, but perhaps one of the PVC grades would be fine. I assume I could join the lengths of PVC together myself, rather than hiring a welder to come join steel sections.

What are some of the advantages and disadvantages of PVC vs steel?

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