Deliverable D.7-2: Compilation of the examination results of the data sets of input data for the respective methodologies assessing vulnerability of the upper aquifer to pollution

This deliverable is part of work package (WP) 7 in the overall project HOVER - Hydrogeological processes and Geological settings over Europe controlling dissolved geogenic and anthropogenic elements in groundwater of relevance to human health and the status of dependent ecosystems. WP7 deals with the harmonized vulnerability to pollution mapping of the upper aquifer, with 16 member states partners.

The vulnerability assessment will be carried out i) at a small scale to obtain a pan-European overview of the groundwater vulnerability and ii) in larger scales to achieve a more precise picture of the groundwater vulnerability situation in several pilot areas, with one of transboundary character, covering parts of Polish and German territory.

In a previous step (Broda et al., 2019) two index methods were identified from a set of proposed approaches to evaluate the intrinsic groundwater vulnerability.

The DRASTIC method (Aller et al., 1987) will be used for the continent-wide evaluation and for non-karstic regions in the pilot areas. In those parts of the pilot regions with karstic features dominating groundwater flow, the COP approach (Vías et al., 2006) will be applied.

Both methods require a set of spatially distributed input data. Subject of this report is the documentation of the input data/input layers that will be used for the pan-European (section 2) and the pilot scale (section 3) vulnerability assessments, respectively. The input layers are generated by rating the values or characteristics of source datasets according to given classification schemes.

Appendix A1 summarises the types of input data and the respective rating system required for DRASTIC (Depth to water table (D), Recharge (R), Aquifer media (A), Soil media (S), Topography (T), Impact of vadose zone (I), Hydraulic conductivity (C)). All input layers of this deliverable were prepared based on the same rating, on which all WP partners agreed. Appendix A2 provides a scheme on how to determine the factors Concentration of flow (C), Overlying layers (O), and Precipitation (P), all of them consisting of a combination of several types of source data, to establish a groundwater vulnerability assessment based on the COP methodology.

For each pilot area, appendix B1 provides tables of data sources and applied methodologies to generate the DRASTIC input layers including main characteristics, supplemented by small maps of the respective input layers. Appendix B2 provides the same information on the input data for the application of COP. However, for reason of clarity the provided maps restrict on the three main factors C, O, and P (see appendix A2).