Analysis of rainfall variation using gis: the ambuliyar watershed, Tamil Nadu, India
Among the climatic elements, the rainfall is the first index, ever thought of by farmers and climatic analysers as it is the most important single factor, which determines the cropping pattern of an area in general, the type of crop to be cultivated and its success or failure in particular. Therefore, the present study deals the rainfall characteristics of the Ambuliyar watershed, which includes the spatial distribution and its variability through different seasons. The study was used 30 years (1984 to 2013) monthly rainfall data for 10 rain gauge stations.