Water and unit elevation check?

[oolon]

I'm looking for a way to return the current water elevation, as well as a way to return a unit's elevation or z-coord position. I was hoping I could use Pick Each Unit based on a unit's elevation, but I can't make it work so far. I can create my own variable for the water level if I have to, but if there's a built-in function for it, that'd be even better.

Any ideas?