1. Principal, D.C.E. Darbhanga, Darbhanga, Patna, Bihar 846005, India (corresponding author).
2. Professor, Dept. of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India.
3. Caroline and William N. Lehrer Distinguished Chair in Water Engineering, Regents Professor and Distinguished Professor, Dept. of Biological and Agricultural Engineering, Zachry Dept. of Civil Engineering, Texas A&M Univ., Scoates Hall, 2117 TAMU, College Station, TX 77843-2117.
4. Lecturer (Senior Scale), Dept. of Civil Engineering, Government Polytechnic Muzaffarpur, Bihar 842001, India.