Use of ‘Easy Fit Software for Probability Analysis of Rainfall of Lower Bhavani Project Command, Tamil Nadu

Rainfall analysis is one of the important components in hydrological processes for either using it as a random chance constrained input or for taking a risk at certain level for crop planning. Hitherto, in rainfall analysis scientists used a few probability distributions and which ever is close fit., represented the data accordingly. Some researchers had used some transformation techniques like Box-Cox square root transformation etc., for bringing the data to suit to either Normal distribution or so. The latest mathematical tool “Easy Fit” a Windows based user friendly software tests about 70 probability distributions and performs two types of goodness of fits Kolmogorov and Anderson and provides ranks as perthe goodness of fit. An attempt was made to analyze the rainfall of Lower Bhavani Project command in Tamil Nadu, the study area for the conjunctive use management of ground and surface water by etymyzing the data to annual, summer, winter and rainy seasons. The best fitted distributions were listed in this paper for all these 4 sets of data. The available 9 years data was used for the study.