1. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Houston, Houston, TX 77204-4003 (corresponding author).
2. Graduate Assistant, Dept. of Civil and Environmental Engineering, Univ. of Houston, Houston, TX 77204-4003.
3. Research Hydrologist, U.S. Geological Survey, 8027 Exchange Dr., Austin, TX 78754.
4. Associate Professor, Dept. of Civil Engineering, Lamar Univ., Beaumont, TX 77706.
5. Associate Professor, Dept. of Civil Engineering, Texas Tech Univ., P.O. Box 41023, Lubbock, TX 79409-1023.