Wambua Raphael .,Mutua Benedict M.,James Raunde.2025-07-102025-07-102017-08DOI: • 10.5897/IJWREE2017.0723http://41.89.96.81:4000/handle/123456789/2156enAnalysis of spatial and temporal drought variability in a tropical river basin using Palmer Drought Severity Index (PDSI)Article