1. Senior Research Fellow, Dept. of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India (corresponding author). E-mail: banasris@gmail.com
2. B.P.Chaliha Chair Professor for Water Resources, Dept. of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India. E-mail: aks@iitg.ernet.in
3. Professor, Dept. of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India. E-mail: chandan@iitg.ernet.in
4. Distinguished Professor & Caroline & William N. Lehrer Distinguished Chair in Water Engineering, Dept. of Biological and Agricultural Engineering, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-2117. E-mail: vsingh@tamu.edu