Trend Analysis of Annual and Seasonal Rainfall in Tawa command Area

Abstract

The main objective of the study is to identify the trend in annual rainfall time series data as well as seasonal rainfall time series of four rainy months i.e. June, July, August and September during the period of 1971 to 2015. The annual sessional trend of rainfall was determinedby non-parametric Mann-Kendall test. Also a non-parametric Sen's Slope estimator was used for the determination of magnitude of trend. A functional relationship has been developed between variables using linear regression analysis in order to determine a linear trend of rainfall for the study area. The study concludes considering the result of all statistical test results, that the study area has shown variability in annual sessional rainfall pattern due to climatic variations. Also the sessional trend analysis of rainfall has suggested that there is a trendvariationof rainfall in the rainymonths