2.4 Methodology
The analysis of the groundwater level trends is described as a supporting element for the water balance test, conducted as part of the process for determining the groundwater quantitative status (CIS, 2009; EPA, 2010).
Since WISE SoE - Water Quantity (WISE-3) provides the possibility to report in more than one temporal resolutions (daily, monthly, seasonal and annual), an aggregation approach has been followed to optimise the use of reported groundwater level data. The aggregation started with daily data and aggregated all the available daily groundwater level values to monthly, seasonal and finally annual values. A minimum set of criteria were met in all intermediate steps, in order to ensure adequate representativity of all seasons on the annual aggregate value.
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Comment from AT
End of 1st sentence: Reference should be (EC, 2009) and not (CIS, 2009)
2nd sentence: What kind of aggregation has been made?
What means seasonal aggregation? What seasons?
And for the country level you are counting the stations with trends? This is not described.
No assessment at GWB level?
Thank you for your comment.
Reference in first sentenced was changed to (EC, 2009)
The description was the aggregation approach was improved:
The data availability and quality was not sufficient for an assessment at GWB level.
POLAND
What was a minimum set of criteria? Length of datasets? Representative periods? It should be explicit.
Thank you for your response. The methodology section was improved and was made more explicit in terms of criteria, length of datasets and representative periods.