In east Africa, Liwenga et al.  project warmer and wetter conditions in the Great Ruaha River region and with increasing seasonal variation and extremes towards the end of the century. A similar observation is made for the River Pangani, with mean river flow being about 10% higher in the 2050s relative to the 1980-1999 period, associated with a 16-18% increase in rainfall in its upper catchment . However, at more local scales, the projections cover a range of slight declines to significant increases in mean annual rainfall amounts . In the Tana River basin in Kenya, water yield is projected to increase progressively under RCP4.5 and RCP8.5 relative to the baseline period 1983-2011 but is characterised by distinct spatial heterogeneity .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report