Thinking about building a deck for someone but water is up and it never goes down. Where I used to live people would build during winter when water was down. So any tips on digging my holes? I'm worried years from now it could sink a little where I didnt get my holes deep enough and hit good ground. Oh and there a no boats that pile-drive them here. Anyone have an idea? If not I want do it because I dont want my name to become bad 10yrs. from now.