1. Research Fellow, Auburn Univ., Auburn Research Park, 559 Devall Dr. CASIC Building, Office 207, Auburn, AL 36832 (corresponding author).
2. Professor, Ecological Engineering, Auburn Univ., 206 Tom E. Corley Building, Auburn, AL 36849.
3. Professor, Dept. of Civil Engineering, Auburn Univ., 229 Harbert Engineering Center, Auburn, AL 36849-5337.