1. Programmer, Water Resources Development Training Centre, Indian Institute of Technology, Roorkee-247 667, Uttaranchal, India.
2. Professor, Dept. of Hydrology, Indian Institute of Technology, Roorkee-247 667, Uttaranchal, India.
3. Ex. Professor, Dept. of Mathematics, Indian Institute of Technology, Roorkee-247 667, Uttaranchal, India.