Author(s): Anshu lata Xalxo, GK Das and N Manikandan

Abstract: The present investigation entitled “Rainfall variability in the Northern-Hill zone of Chhattisgarh and its impact on climate change adaptations” was conducted at Institute Of Water Management, Bhubaneswar, Odisha, during 2019-2020. The district-wise long term weather data (1981-2018) was collected from Department of Agrometeorology, IGKV, Raipur. The northern hill zone selected that includes Jashpur-Nagar, Koriya and Surguja. It was observed that in Northern Hill zone areas of Chhattisgarh the average seasonality index value ranges from 1.2 that means the rainfall occurs less than 2-3 months. In Jashpur-nagar the highest value observed in 2006 (1.3), where as in Surguja the lowest values ranges from 0.9-1.3 during 1982 and 1998 year respectively which denotes with the long dry period in the season the highest value observed during 1991 (1.3) which indicates less than 3 months. Where as in koriya district the minimum value observed 1.0 during 1982, 1998, 2003, 2013, 2014 and 2015. As we observed maximum rainfall occurred during less than 3 months further investigation of index done in the southwest monsoon and hence in Jashpur-Nagar it was observed that the values are obtained in between 0.12 and 073 in which the lowest value was 0.12 are observed in 2011 year. On the basis of Seasonality Index this year indicates the distribution of rainfall pattern throughout the season. The highest value was obtained in 2009 (0.73) which denoted that the distribution of rainfall pattern is seasonal. On average values from 1981-2018 years the value was observed 0.34 which denotes that Jashpur-Nagar district showed rainfall distribution pattern for south-west monsoon is seasonal with a long dry period in the season during the last 38 years. In Surguja it was observed that the minimum value of Seasonality Index 0.07 was observed in the year 2005 which indicates that during this year the rainfall was spread throughout the season. The average values of south-west SI for the last 38 years for Surguja district reported 0.46 that the rainfall occurred with a short drier period in the season. In koriya it was observed that the highest value is 0.18 which was observed in 2005 year which indicates that during this years the distribution of rainfall pattern for south-west monsoon is less than 3 months in the season while in the year 2006 realized lowest value with 0.73 which indicates that in this year the distribution of rainfall pattern is seasonal for south-west monsoon season. The average south-west Seasonality index value of the district was 0.44 denotes than the Koriya district showed the distribution of rainfall is rather seasonal with a period of short drier season.

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