1. Research Scientist, Dept. of Civil and Environmental Engineering, Virginia Tech, 418 Durham Hall, Blacksburg, VA 24061 (corresponding author).
2. Charles Lunsford Professor of Civil Engineering, Dept. of Civil and Environmental Engineering, Virginia Tech, 418 Durham Hall, Blacksburg, VA 24061.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Virginia Tech, 418 Durham Hall, Blacksburg, VA 24061.
4. Civil Sanitary Engineer, Greeley and Hansen, LLC, 6564 Loisdale Court, Suite 100, Springfield, VA 22150.