Changes in short term river flow regulation and hydropeaking in Nordic rivers.

Around 50% of the statistically significant gauging stations showed a positive trend slope for HP1, with Sen’s slope value ranging between 0.00007 and 0.087 annually.

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Changes in hydropeaking in recent years Of the 92 regulated river gauging stations analyzed, 54 had more than five years of hourly discharge data, and 34 (63%) of those 54 stations showed a significant trend (Mann-Kendall trend test) for HP1, while 40 (74%) showed a significant trend for HP2.

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In the present analysis, we observed that hydropeaking is already at high levels in many Nordic rivers and that there is an increasing trend in HP1 for 63% of rivers with >5 years of observations and in HP2 for 74% of these rivers.

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