1. University Distinguished Professor, Emeritus, Dept. of Civil and Environmental Engineering, 200 Patton Hall, Virginia Tech, Blacksburg, VA 24061. E-mail: jmd@vt.edu
2. Associate Professor, Dept. of Civil and Environmental Engineering, 200 Patton Hall, Virginia Tech, Blacksburg, VA 24061 (corresponding author). E-mail: tb@vt.edu
3. Brunswick-Abernathy Regents Professor, Civil Engineering Dept., The Univ. of Texas, 1 University Station C1792, Austin, TX 78712-0280. E-mail: swright@mail.utexas.edu
4. Research Engineer, USACE ERDC, 3909 Halls Ferry Rd., Vicksburg, MS 39180-6199. E-mail: noah.d.vroman@erdc.usace.army.mil