1. Project Engineer, MWH Global, Inc., 12 Farnsworth St., Boston, MA 02210.
2. Senior Consultant, Barr Engineering Company, 4700 West 77th St., Suite 200, Minneapolis, MN 55435 (corresponding author).
3. Joseph T. and Rose S. Ling Professor, Dept. of Civil Engineering, Univ. of Minnesota, 500 Pillsbury Dr. SE, Minneapolis, MN 55455.
4. Associate Professor, Dept. of Civil Engineering, Univ. of Minnesota, 500 Pillsbury Dr. SE, Minneapolis, MN 55455.
5. James L. Record Chair, Dept. of Civil Engineering, Univ. of Minnesota, 500 Pillsbury Dr. SE, Minneapolis, MN 55455.