Trend and Periodicity Analysis in Rainfall

Seasonal and annual rainfall data of the stations: Akluj, Baramati, Bhor and Malsiras stations lo-cated in Nira Basin, Central India, were analyzed for studying trend and periodicity using 104 years ’ rainfall data. The analysis was carried out by using Mann-Kendall (MK), Modified Mann-Kendall (MMK) and Theil and Sen’s slope estimator tests describing rising trend at all the stations. However, it is statistically significant at Akluj and Bhor stations at 10 % significance level. Bhor station showed the maximum increase in percentage change i.e. 0.28 % in annual rainfall. Monsoon and post-monsoon seasonal rainfall shows a rising trend while the summer and winter seasonal rainfall shows a falling trend. Wavelet analysis showed prominent annual rainfall periods ranging from 2 to 8 years at all the stations after 1960s resulting in describing more changes in the rainfall patterns after 1960s