1. Scientist “F,” National Institute of Hydrology, Roorkee 247 667, India. E-mail: ncg@nih.ernet.in
2. Emeritus Fellow, Water Resources Development and Management, Indian Institute of Technology, Roorkee 247 667, India. E-mail: gcmdrfwt@iitr.ernet.in
3. Research Scholar, Water Resources Development and Management, Indian Institute of Technology, Roorkee 247 667, India.