Generally, it was determined that lakes predominantly showed a trend towards a reduction in water level fluctuations.
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Long-term trends in water level fluctuations in lowland lakes in central Europe (Northern Poland).
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The sentences
In lakes in eastern Poland, similar to average water levels, a decreasing trend was observed in the period 1973–2002, while the opposite situation occurred in lakes in western and central Poland.
In the period 1963–1992, a negative trend occurred at four meteorological stations: Drawsko Pomorskie, Gorzyń, Kołuda Wielka, and Tomkowo.
On the other hand, there is a levelling of the highest levels (only five lakes showed an increasing trend, on average by 5.2 cm per decade) and amplitude of fluctuations.