Hi Essup. This is on the water side of the levee, so no critters shold be burrowing where I can't see them. This is not a dam on a running stream, so I don't have much critter problem, ie beavers, muskrats, etc.

I would not do this on top of the ground. This will be placed and installed on smooth bround that we dress for this specifically, and then we'll top it with at least 2 feet of clay soil.

Another consideration is I like to burn off the pastures every year. If you get even a small grass fire on the levee it will get the plastic down to the water line. MORE IMPORTANTLY...if you are new to this be VERY careful about fires on a levee, esp if you have a black plastic pipe serving as drainage. The fire can get to that and do a slow burn all the way through a levee and destroy the pipe and damage the levee too.

Thanks for the note.

Bill