1. Assistant Professor, Dept. of Civil and Environmental Engineering, Mississippi State Univ., Mississippi State, MS 39762 (corresponding author).
2. Assistant Professor, Dept. of Forest Engineering, Resources and Management, Oregon State Univ., Corvallis, OR 97331.
3. Graduate Student, Dept. of Civil and Environmental Engineering, Mississippi State Univ., Mississippi State, MS 39762.
4. Professor Emeritus, Dept. of Civil and Environmental Engineering, Univ. of Delaware, Newark, DE 19716; and Consultant, ADAMA Engineering, Inc., P.O. Box 7838, Newark, DE 19714.