Rainfall Trends of Bhadradri District in the Past Three Decade

Abstract

Bhadradri district of the central Telangana zone is monsoon dependent as like our country in the past three decades many changes and shifts in the rainfall was experienced by the district farming community. Hence, the rainfall data of the past three decades (1991-2020) was analyzed by using non parametric statistical tests i.e Mann-Kendall (MK) test and Sen’s slope estimator for determining the trend and magnitude. The Results of the study revealed that Z test value for annual rainfall was significantly increased with Positive linear trend of Sen’s slope estimator with +12.79 mm increase per year. Among the seasons Southwest monsoon period reported significantly positive trend with Z value of 2.07 and Sen’s slope estimator was +9.227 mm per season. Highest rainfall variability (116.3%) was found in the winter season with negative Z value (-1.559) and decreasing Sen’s estimate of -0.397 mm per season was reported. Mann Kendall test values for monthly rainfall reported that significant increase in the march month with Z value of 2.030 and Sen’s slope estimator was highest during the month of August +3.988 mm per month.