1. Civil Engineer, US Army Corps of Engineers, P.O. Box 2947, Portland, OR 97208. E-mail: jeremy.p.britton@usace.army.mil
2. Professor, Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061-0105. E-mail: filz@vt.edu
3. Project Engineer, ARM Group Inc., 1129 West Governor Rd., Hershey, PA 17033-0797. E-mail: wherring@armgroup.net