Climate Extremes Related with Rainfall Trends in Agniyar River Basin

The rainfall extremes variability due to climate change can be detected by the trend analysis. The trend analysis is implemented for the precipitation data period starting from year 1980 to 2021 (42 years) for the Agniyar river basin. The Mann-Kendall (M-K) test is employed to identify trends in precipitation, while The trend's magnitude is calculated using the Sen's slope method. The rainfall trend in Yearly Maximum Daily Rainfall (YMDR), South West Monsoon (SWM), Summer season, North East Monsoon (NEM), winter season and annual rainfall are computed. The results of twelve rain gauge stations in the Agniyar river basin revealed increasing, decreasing, and non-significant trends, with a notable increase in precipitation observed at some locations with acceptable significance. Most of the stations showing declining trend in precipitation based on Sen’s magnitude and negative slope. The outcome of this study needs of hour to the hydrologists, water resources engineers, water resources managers, environmentalist, sustainable development policy makers, inter-disciplinary climate change researchers and consultants involved in solving problems related to change in climate impact. The results of precipitation extremes are necessary for creating adaptation strategies in response to climate change.