In this scatter diagram the variation is weakly linear but it would be hard to draw a so-called "best-fit" straight line through points with this much scatter.
However, there are some generalizations that we can draw from the variation depicted.
Casual inspection of the plot suggests that the maximum annual discharge has tended to decrease since the records began in 1982.
Therefore, the slope is:
Knowledge of the maximum annual discharge in one year leads to a satisfactory prediction of the maximum annual discharge in the next year.
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