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The GLT is presented in three classes that indicate the statistical significance (p-value < 0.05) and direction of the groundwater level trends.
|
GLT index classes |
GLT ranges (m/y); p-value |
Color scheme |
|
Increasing groundwater level trend |
GLT > +0.01 m/y and p-value < 0.05 |
blue |
|
No significant trend observed (NT) |
p-value > 0.05 |
grey |
|
Decreasing groundwater level trend |
GLT < -0.01 m/y and p-value < 0.05 |
orange |
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POLAND
Why the applied methodology does not acknowledge R2 ? In accordance to „Aqueduct 3.0: Updated Decision. Relevant Global Water Risk Indicators”, to which the authors of the "draft" refer to, R2 value should also be evaluated.
Thank you for your comment. The R2 is not evaluated because it does not provide information about the significance of the groundwater level trends assessed in the developed approach. It could provide information about the level of temporal variability of the groundwater level trends. However, interpreting and aggregating such information for a range of individual groundwater level monitoring stations would lead to ambiguous conclusions. In the Aqueduct 3.0 approach, the Declining Groundwater Table Declining Trend (GTDT) is based on gridded global model results that are aggregated to the scale of large groundwater bodies before trend calculation is applied. In this apporach, the R2 values show a strong correlation with the p-values (low p-values with high R2, and vise versa).