The study examined the intra-seasonal rainfall variability in the Oti River basin for the historical (1981-2010) and future periods (2021-2050) by analysing rainfall indicators like annual rainfall total, seasonal rainfall total, onset, cessation, length of the rainy season and the number of wet and dry days, as well as the repercussions of the variations on the basin’s streamflow. The study projected a decline in its mean rainfall, a late rainfall onset, early cessation and shorter length of the rainy season in the basin. For streamflow, a general increase was predicted except for Arly which would decrease by 2.79% under RCP4.5 scenario. The study also revealed how the accuracy of streamflow prediction by the HBV model decreased in smaller basins like Arly and Porga.

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