The President: One of our concerns about building in urban areas in recent years has been the subject of water table, although it is not mentioned in the paper. I believe that, in Birmingham, the general rise of the water table, since extraction of water for industrial purposes has ceased, is at the rate of about 3m p.a. One of the consequences is to alter our thinking about pile design, from making them long and thin to making them short and fat. Would you care to say what considerations you gave to the changing water table.