I'm getting a bid together for my first dry creek bed. I am trying to figure out how long it will take to finish the job. I know there are a lot of variables, but does anyone have an average time by the square foot or anything else that could help? It will be in a backyard and the only acces is through a 40" gate. Also, I am trying to figure out a way to keep the bermuda from growing into the creek bed. Any ideas for an edging or something that would not ruin look but keep the grass out?