I had a trench dug and the water table was very high.

I had my Portuguese laurels delivered the same day and needed to get them into the ground. I ended up putting a garden mix soil back into the trench and then burming up the trees so that they sit just on top of the water table line.

Will that water eventually dissipate into the ground?

What else do I have to worry about since it is so wet there?

There's not much you can do about a high water table except try to plant above it. The level of the water table may go down if the weather dries out long enough to allow that but then again, it may not. Was it always this high? If you are near a water source (lake, river...) chances are it won't happen and you should have planted bog plants.

James - I read that these like free-draining soil and don't like to be wet for too long. If you have a poorly draining site, you may be taking a risk with the plants. A berm is good but is it high enough?