DETECTING FIVE YEAR WISE RAINFALL TRENDS OF KALAYAN KARNATAKA, INDIAVISHWANATH AND G.V. VENKATARAMANA
An attempt was made to study the five year wise rainfall trends of Kalayan Karnataka. The study period spans for a period of 50 years from 1971-2020 which was divided into ten periods comprising each 5-year moving average to detect long term trends and further a linear tend was added as parametric test. Long term changes in rainfall characteristics were determined by both parametric and non-parametric tests. The analysis revealed that the period from 1991-1995 was found to be highest mean rainfall receiving period for the Bidar (1078.9 mm), Kalaburgi (976.7 mm) districts whereas for the Yadgir (1171.1mm) district it was from 1986-1990. However for Raichur (875.5 mm) and Koppal (670.7 mm) districts the period from 2001- 2005 was found to be highest mean rainfall receiving period whereas 1971-1975 was found to be for Ballari (705.7 mm) district. The highest CV was recorded during the period from 1981-1985, 1976-1980, 1976-1980, 2016-2020, 1976-1980 and 2006-2010 from Bidar (34.5%), Kalaburgi (36.8%), Yadgir (43.3%), Raichur (39.7%), Koppal (30.9%) and Ballari (30.8%) respectively indicating higher variability and lesser dependability. Senâs slope estimator showed that there is a positive trend for the Bidar, Raichur and Koppal rainfall pattern. However, Kalaburagi, Yadgir and Ballari exhibited a decreasing trend.