1M-Tech Scholar, G.B. Pant University of Agriculture & Technology, Pantnagar, Uttarakhand, India
2Professor, Department of Irrigation and Drainage Engineering, GBPUA&T, Pantnagar, Uttarakhand, India
Online published on 8 May, 2017.
The probability and frequency of rainfall pattern is one of the important parameter for long term planning of agricultural operation and irrigation schemes as well as for watershed management. Keeping above points in view the statistical analysis has been carried out for 20 year period (1996–2015) of rainfall of Udham Singh Nagar. The average annual rainfall was found to be 1706.0 mm. All months, season and years has been distributed as drought, normal and surplus months. The expected rainfall at different rainfall chances (80%, 50% and 20%) has been carried out. The study reveals that the Kharif was the wettest season with average rainfall of 1530.705 mm and C.V. = 4.1 and Rabi was the driest season with average rainfall of 176.8 mm and C.V. = 0.7. Out of all 20 years months 44.17% months are drought months and 43.75% and 12.08% months are normal and surplus months, respectively. Maximum number of normal months was found in July and August months and maximum number of droughts months in November month followed by October. The expected probability analysis results can be used for crop planning, intercultural operations and planning of irrigation scheme in the command area. The surplus water available in the monsoon season can be stored by constructing water harvesting structures in the command area and that can be used during Rabi season when scarcity of water faced due to lack of rainfall.
Normal, Drought, Surplus season, Normal, Drought, Surplus months
