Hydrogeology of Germany 1:1,000,000 – Classification according to the Standard Legend for Hydrogeological Maps (HY1000–SLHyM)

In the original version of the map (Map “Hydrogeology” of the Hydrological Atlas of Germany (HAD)), the surface rocks are first divided into four main types, with further differentiation depending on the extent and productivity. This original subdivision has been resolved applying the internationally widely used Standard Legend for Hydrogeological Maps (SLHyM) after Struckmeier & Margat (1995). This makes the map clearer and easier to read, but above all, it is comparable to other European hydrogeological country and regional maps, such as the International Hydrogeological Map of Europe (IHME1500). The productivity classes have been derived from permeability values. In addition, the surface strata are divided into 19 different types of consolidated or unconsolidated rocks and four types of covering layers. The map is based on the digital Geological Map of Germany 1:1,000,000 (GK1000) published by BGR in 1993.