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Paper Details

Rainfall and rainy day trends at Dharwad, Karnataka

U.V. MUMMIGATTI*, N.E. NAVEEN AND B.T. NINGANUR

Journal Title:International Journal of Agricultural Sciences
Abstract


Rainfall data of 27 years (1985-2011) obtained from Agromet Observatory, Main Agricultural Research Station (MARS), University of Agricultural Sciences, Dharwad was analysed for rainfall and rainy days. The trend indicated that the tract received a mean annual rainfall of 720.2 mm in 54 rainy days with maximum contribution (62.93%) from south west monsoon (June to September). July was the rainiest month (129.7mm) with 11 rainy days. This region experienced severe drought (mean rainfall of 379.8 mm) during the period 2000 to 2004. On the contrary, during recent the last 7 years (2005-2011), the annual rainfall was exceptionally above normal, which ranged from 866.2 mm to 1140.4 mm with a mean value of 986.8 mm and lower standard deviation (97.72) and co-efficient of variation (13.56 %), indicating lesser variability and more dependability. The annual rainfall variability during the last 27 years (1985 to 2011) indicate that 17 years normal rainfall (-4.8 to 58.2%) and 5 years slightly drought (-13.2 to -24.4%) and 2 years moderate drought (-26.9 to -39.6%) and 3 years severe drought (-49.7 to - 75.7%).There were no significant trend in the mean annual rainfall. The mean annual 54 rainy days of 27 years (1985-2011) was recorded with maximum contribution of 68.72 per cent with 37 rainy days from south west monsoon (June to September).

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