Crawlspace plumbing

Should crawlspace plumbing for sinks, tub, etc. run along the dirt floor, be buried under the dirt, or be suspended from the floor joist with metal straps?

This house has the plumbing running along the dirt floor. Not sure whether I need to bury it deeper or suspend from floor joists. The crawlspace area is about 2 feet high.

Matters not that I know of as long as it is supported correctly and has the proper slope I would have no concerns .
Roy Cooke

Up, out of the way, protected from damage would be my preference.

Generally I have seen supply piping supported to the joists and waste pipe along the ground. Actually, I have never seen supply pipe on the ground.