Though there is considerable variation within the basin among different climatic zones, some of the previous studies in BNB didn't find a significant trend of change in historical precipitation.
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A review of hydroclimate variability and changes in the Blue Nile Basin, Ethiopia.
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Within the same sub-basin of Lake Tana, a study reported a significant decrease in annual precipitation across the majority of the area, while one out of ten stations showed a positive trend during the period from 1980 to 2015 [ 30 ].