CHARACTERIZATION OF RAINFALL IN HAVERI DISTRICT
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Date
2018-08-01
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University of Agricultural Sciences, Bangalore
Abstract
The amount of rainfall and its pattern is one of the important factors that affect agricultural system. The analysis of rainfall data for long period provide information about pattern and its variability. For this purpose daily rainfall (mm) data pertaining to all taluks of Haveri district were collected from the AICRP on Agro meteorology, UAS, GKVK for the period of 32 years from 1982-2013.68. The average annual rainfall in the district during the study period was found to be 746.32 mm with a coefficient of variation of 21.27 per cent. Sixty eight per cent of the annual rainfall was received from South-West monsoon of which September month received highest amount of rainfall in the district. Mann Kendall test has revealed that all taluks of the district have registered non- significant positive trend. However, two taluks namely Byadgi & Hirekerur were found to have positive significant trend in annual rainfall out of seven taluks. The probability distribution viz., Normal, lognormal, Gamma (1P, 2P, 3P), General extreme value (GEV), Weibull (1P, 2P, 3P), Gumbel and Pareto were fitted for rainfall data of different periods of the district to observe pattern and goodness of fit was tested using Kolmogorov– Smirnov test. From the analysis, Weibull and Normal were found to be best fitted distributions for annual and seasonal rainfall data respectively. For Standard Meteorological Week 23rd to 39th SMW of rainfall data, Gamma, Log-Normal, Weibull and GEV were found to be the best fit distributions.