Relationship between Rainfall Amount, Mean Daily Rainfall Intensity and Rainy Days at Udham Singh Nagar District, Uttarakhand, India

In the present study, long-term daily rainfall data (1962-2012) of Udham Singh Nagardistrict was analysed to understand relationships between Rainfall Amount (RA), Mean Daily Rainfall Intensity (MDRI) and Rain Days (RD) on monthly, seasonal and annual basis. The study revealed erratic distribution of rainfall occurrence as MDRI with highly correlated values (0.83-0.90) was observed for different months, seasons and annual data series. The value of X * (percent rain amount cumulated in first 50% of rain days) was found highest (11.89%) for March, whereas, among seasons, its highest value (10.45%) was observed for season S 2 (March-May). In the same way, value of first 50% rainfall cumulated ( Y *) was found highest for October month and among seasons with season S 4 (October-December). It was also found that 29.59% rain days per annum accounted for 78.98% rainsreceived at Udham Singh Nagar district.