Vol. 11, Special Issue 8 (2022)

Author(s):
Pramod Kumar, Ramesh Kumar, Asisan Minz, Ragini Kerketta and Manoj Kumar

Abstract:
In this study, analysis of the variability and trends in the daily gridded rainfall events of ≥5 mm or [daily rainfall events] during the southwest monsoon of four seasons (Monsoon, Post-monsoon, winter and summer) season over geographical regions of Giridih district of Jharkhand, India. The results of this study underscore the complex processes and variability of rainfall data that is associated with 13 blocks of Giridih, district, India, over 20 years (2000-2019) were analyzed. The average annual rainfall of Giridih district of Jharkhand, India was observed about 1058.4 mm. Dumari recorded the highest rainfall of 1362.2 mm while the lowest was 737.6 mm in Gawan block. No significant variations in total rainfall were observed. The result showed that the rainfall distribution among four seasons (Monsoon, Post-monsoon, winter and summer) which clearly indicated that 85.1 to 89.4 percent rainfall mainly concentrates during monsoon months and rest 10.6 to 14.9 percent within the rest three seasons under such circumstances possibility of second crop is only for less water requiring crops with minimum, reduced tillage or under paira cropping. The huge difference in rainfall was observed in the month of June that was lies between 91.8 mm and 243.3 mm among the allocated blocks of Jharkhand, while less fluctuation in rainfall was observed in September among the rest blocks of Jharkhand, India. in this research the September rainfall virtually helps the maturity of crops and planning the succeeding Rabi crops. Under such situation if rain seizes, a supplemental irrigation is essentially required and harvested water may support the crops to greater extent. Variations in trend of rainfall have been observed in time and space. Trend analysis on total as well as monsoonal rain has been showed variable trend within the blocks. Most of blocks (Giridih, Bengabad, Gandey, Jamua, Dhanwar, Deori, Tisari, Gawan, Pirtand, Dumari, Bagodar, Suriya) recorded a decreasing trend of rainfall between -4.0 to -42.3 mm/yr whereas increasing trend of rain was observed in Birni as 14.5 mm/yr.