1. Graduate Student, Civil Engineering Dept., Univ. of Texas at Austin, Environmental and Water Resources Engineering, ECJ 8.6 Austin, TX 78712.
2. Assistant Professor, Dept. of Civil, Architectural, and Environmental Engineering, Drexel Univ., 3141 Chestnut St., Philadelphia, PA 19104 (corresponding author).
3. Graduate Student, Dept. of Civil, Architectural, and Environmental Engineering, Drexel Univ., 3141 Chestnut St., Philadelphia, PA 19104.