1. Associate Professor, Dept. of Civil Engineering, Birla Institute of Technology and Science, Pilani, Hyderabad Campus Jawahar Nagar, Shameerpet (Mandal), R.R. District Hyderabad, Andhra Pradesh 500 078, India (corresponding author).
2. Professor, Dept. of Biological and Agricultural Engineering and Zachry Dept. of Civil Engineering, Texas A&M Engineering Experiment Station, Texas A&M Univ., College Station, TX 77843-2117.