Probability Anlysis of Rainfall

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The amount of rainfall at different probability levels (10-90%) called Assured Rainfall (AR) have been computed for each standard week by fitting Incomplete Gamma Distribution model. Tables of assured rainfall at different probability levels were prepared. Rainfall patterns were identified on the basis of peaks and troughs in the AR values over the period of time. Areas showing similar pattern are identified as assured rainfall zones. On this basis dry farming tract of India has been divided into seven homogeneous rainfall pattern zones. The homogeneous rainfall pattern zones of Gujarat, Rajasthan, Maharashtra, Karnataka, Andhra Pradesh and Tamil Nadu States have also been delineated using taluka level data.