I'm running a trench out to my shed for electrical. I'd like to use the same trench for a water line so I can have a spigot back there, and possibly future sprinklers. I'd also like to make it fairly easily to replace if it ever freezes or develops a leak (digging through a foot of sodden clay isn't that fun).
My thought is to run the electrical in rigid metal conduit (so ~6" deep trench), and also lay down 1.5" PVC alongside it, then feed funny pipe through that. If I ever get a leak, I can just pull the funny pipe out and feed a new one in.
Any drawbacks I'm not thinking of here?