The surface spread of hydrogeological units is shown without the overlay by overlays (lower permeable, binding, predominantly quaternary and holocene curler sediments). In addition, the pore aquifers in the valleys of larger rivers were also covered (see geola_hyd_pgwl). The coverage was usually done except for the top hydrogeological solid rock unit. In the foreland of the Alps, the holocene binding layers were removed, the glacial sediments were not taken into account. In the Upper Rhine trench, the top layers were removed except for the mighty quaternary pore aquifer.
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