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Significant upward trend and trend reversal of pollutants
The Groundwater Directive requires that significant and sustained upward trends of pollutants should be identified and reversed. A significant trend is one that could lead to a groundwater body failing to meet its environmental objectives before 2021, if measures are not put in place to reverse it. Only a few countries reported any upward trend for the first RBMP, so comparison is difficult.
The total groundwater area with identified upward trend (9.9 % of groundwater area) is nearly double the area with a trend reversal (5.9 % of groundwater area).
Significant and sustained upward trends were identified for 58 pollutants, mainly for nitrate, which were detected in 19 Member States (Figure 4.4). Other substances with upward trends are similar to those in Figure 4.3.
In contrast, trend reversals were reported for 65 pollutants by 14 Member States (Figure 4.5), mainly for nitrates, sulphates, ammonium and chlorides.
Figure 4.4. Pollutants with an upward trend by area of groundwater bodies
Figure 4.5. Pollutants with a trend reversal by area of groundwater bodies
Note Over 10 GWBs and over four countries shown - Number of countries in brackets
Source: Preliminary results based on WISE-SoW database including data from 25 Member States (EU28 except Greece, Ireland and Lithuania).
As groundwater chemical data for second cycle RBMPs were mainly collected during 2010 – 2012 and the effect of measures is likely to take time, increased trend reversal of existing pollutants may be expected in future years.
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Further and detailed information on groundwater pollutants with upward trend or trend reversal is available in WISE · Groundwater pollutants trend reversal · Groundwater pollutants upward trend |
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Part of the text in figure 4.4 is unreadable.
"Note Over 10 GWBs and over four countries shown - Number of countries in brackets" should be deleted.
(AT) 1st para:
The Groundwater Directive requires that significant and sustained upward trends of pollutants should be identified and reversed. A significant upward trend is one that could lead to a groundwater body failing to meet its environmental objectives before the end of this plan period in 2021, if measures are not put in place to reverse it. Only a few countries reported any upward trend for the first RBMP mainly due to the lack of suffiently long time series, so comparison is difficult
Groundwater Directive: Not the GWB buit the WFD requires that in Art 4.1.b.iii
SK: Page 48, 1st paragraph: In the last sentence, there is mentioned that only a few countries reported any upward trend for the first RBMP, so comparison is difficult. If it is possible, please, explain the reason behind it.
SK: Page 48, 4th paragraph: Can you shed some light why there are more pollutants with trend reversal than there are pollutants with upward trends? Particularly in reference to the lack of trend analyses for the 1st RBMP.
"Significant and sustained upward trends were identified for 58 pollutants, mainly for nitrate, which were detected in 19 Member States (Figure 4.4). Other substances with upward trends are similar to those in Figure 4.3.
In contrast, trend reversals were reported for 65 pollutants by 14 Member States (Figure 4.5), mainly for nitrates, sulphates, ammonium and chlorides."
Error bars here would be most helpful, are these changes significant at any level? It is difficult to interpret these figures without the appropriate context in regard to how important the changes reported might be, beyond qualitative indications.
The tool for data visualisation is very efficient and very pleasant.
However it's very difficult to understand data visualisation on « Groundwater bodies: Pollutants », especially « Upward trend » variable. For exemple, addition of trends of Nitrates by country don’t give 100 % ( Trend reversal « YES » + Trend reversal « No » + Trend reversal « Unknown »)
https://tableau.discomap.eea.europa.eu/t/Wateronline/views/WISE_SOW_gwPollutant/GWB_gwPollutant_Europe_G?:embed=y&:showAppBanner=false&:showShareOptions=true&:display_count=no&:showVizHome=no
Maybe a guidance would be useful, or a tool with less input parameters, or verification