1. Research Assistant, Dept. of Civil Engineering, Univ. of Louisiana at Lafayette, P.O. Box 42291, Lafayette, LA 70504 (corresponding author).
2. Associate Professor, Dept. of Civil Engineering, Univ. of Louisiana at Lafayette, P.O. Box 42291, Lafayette, LA 70504.
3. Professor, Institute of Hydraulic Engineering, Univ. of Stuttgart, Pfaffenwaldring 61, D-70569 Stuttgart, Germany.