1. Associate Professor, School of Civil Engineering, Purdue Univ., 550 Stadium Mall, West Lafayette, IN 47907-2051 (corresponding author).
2. Associate Professor, School of Civil Engineering, Purdue Univ., 550 Stadium Mall, West Lafayette, IN 47907-2051.
3. Professor, Dept. of Agronomy, Purdue Univ., 915 W. State St., West Lafayette, IN 47907.
4. Project Professional, Fugro Consultants Inc., 6100 Hillcroft, Houston, TX 77274.