1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Maryland, College Park, MD 20742-3021.
2. EI, Project Engineer, CH2M Hill, 3201 Beechleaf Ct, Suite 300, Raleigh, NC 27604.
3. Assistant Professor and Extension Specialist, Dept. of Biological and Agricultural Engineering, North Carolina State Univ., Raleigh, NC 27695-7625.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, College Park, MD 20742-3021 (corresponding author).