A positive value indicates an 'upward trend,' and a negative value indicates a 'downward trend.' Serial autocorrelation can increase the likelihood of the Modified Mann-Kendall (MMK) test detecting a significant trend.
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Analysis of trends and variability of hydroclimate variables in the Didessa Sub-basin: Implications for the Upper Blue Nile (Abbay) Basin, Ethiopia.
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The sentences
A study using the Mann-Kendall analysis on rainfall and streamflow data in the Abbay Basin observed an increasing trend in streamflow during the rainy season but a decrease during the dry season.
Conversely, Gidayana station displayed a marginally non-significant negative trend, while the Agaro and Nolekaba stations showed significant positive trends in the summer.
Conversely, two stations exhibited a decreasing trend, with one significantly decreasing trend at the 5 % significance level.
Rainfall The rainfall analysis results displayed a nonsignificant trend for most stations, including the sub-basin.
Stream flow Analysis results for the annual and seasonal timescales showed a positive trend in the observed stream flow of all stations except Dembi and Big Anger ( Table 5 ).