HotLine1:
The water line will lay on the ground as far as I know, (that probably violates some plumbing code).
Unfortunately, I am the AHJ, and do not have all the answers. As an AHJ I have not encountered a situation like this where they cannot bury the wiring method , or have a structure to secure to.
I have considered laying pressure treated wood on ground, then securing the PVC to that... but, in an extreme high tide it may float and the wave action may damage the conduit system. Not to mention the chemicals that will leech from the pressure treat into the water.
Type W cable is OK (say the engineers), & I have approved it in the past as a wiring method along the movable gangways to the floating docks, as it must be flexible, & it can be immersed in salt water. I wonder if I can go with a combination of type W and PVC conduit somehow. All this for a plug and a few lights.
Sometimes, being the AHJ in not such a good thing!
RickG
