Abstract:
The study investigates trend for rainfall, temperature and potential evapotranspiration for the
Kalahandi-Bolangir-Koraput (KBK) region in the state of Odisha using Mann-Kendall (MK) test and
Sen’s Slope estimator. The rainfall trend analysis indicates Malkangiri with significant increasing and
Nuapada with significant decreasing trend at 95% significant level. The study also investigates monthly,
annual and seasonal trend of meantemperature of KBK districts for the period 1901 to 2002 (102 years).
Seasonal analysis has also been carried out for the annual mean temperature. MK test indicate a
significant increasing temperature trend in the mean annual series. The districts like Kalahandi, Koraput,
Malkangiri, Nabarangpur, and Nuapada, the increasing temperature trend is significant at alpha = 0.001
level of significance. The seasonal mean temperature is also showing an increasing trend in the region.
The Southern and Western part of the KBK region (Nabarangpur, Malkangiri), in particular, are
experiencing significant increasing temperature trend at alpha = 0.001 level of significance in comparison
to the Northern and Eastern part (Bolangir and Sonepur). On investigation of the potential
evapotranspiration of the eight districts and whole KBK region, it has been found that the trend is upward
in nature i.e. increasing. This will increase the water demand in the region with higher crop water
requirement in future.
