1. Research Scholar, Dept. of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247 667, India (corresponding author).
2. Professor, Dept. of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247 667, India.
3. Scientist-G, National Institute of Hydrology, Jal Vigyan Bhawan, Roorkee, Uttarakhand 247 667, India.