1. 59/4 Ravindra Lok, Indian Institute of Technology Roorkee (formerly, Univ. of Roorkee), Roorkee 247 667, India.
2. Professor, Water Resource Development Training Center, Univ. of Roorkee, Roorkee 247 667, India.
3. Assistant Professor, Dept. of Civil Engineering, MBM Engineering College, JNV Univ. Jodhpur 342 011, India.