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For 9% of the monitoring stations a trend downwards was observed, while 10% of the monitoring stations showed a trend upwards. Although, occasionally, increases and decreases may exceed 2 metres per year, the groundwater level increases or decreases most commonly range up to 0.2 metres per year.
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Comment from AT:
0.2 metres per year means that in 2000 the level was 3.8 metres higher/lower compared to 2019? That sounds more impressive than 0.2 meter per year. Would be good to also indicate the total maximum increase and decrease (more than 2/year means more than 38m in total?)
It would also be good to distinguish trends into several classes and not to put soft and very significant trends in one box. 9% down and 10% up sounds quite balanced, but it is not, if the 9% consist of -2.2m/y trends and the 10% up consist of 0.01m/ trends.
Thank you for your comment. We agree that this classification is too vague and it is improved. However, with the purpose of conveying a clear message to policy makers we maintain the representation in three classes in the figures instead of a more detailed classification.
In the section with supportin information, the classes are described as:
Also, additional information on the distribution over these classes is provided in the note section of Figure 1a and 1b:
“It can be observed that 11% of the monitoring stations show a downward trend (less than 0.1 m/y decrease: 4%; between 0.1 and 1 m/y decrease: 6%; decrease of more than 1 m/y: less than 1%), 6% of the monitoring stations show an upward trend (less than 0.1 m/y increase: 2%, between 0.1 and 1 m/y increase: 3%; decrease of more than 1 m/y: less than 1%) and 83% of the monitoring stations show no significant trend.”
POLAND
It should be recalculated with using the same units.
Thank you for your comment. Please refer to the anwers to the previous comments.