Hydrogeological overview map 1:250,000 of Germany (HÜK250)

The hydrogeological overview map of Germany (HÜK250) describes the hydrogeological properties of the upper, extensively connected aquifers in Germany on a scale of 1:250,000. In addition to lithology, stratigraphy and ladder character, five hydrogeological attributes are recorded, which are shown in the thematic maps of consolidation, rock type, type of cavity, permeability and geochemical rock type. The respective systems and classifications are based, among other things, on the hydrogeological mapping instructions of the State Geological Services (SGD) from 1997. The HÜK250 is a digital map series. The HÜK250 is a joint project of the SGD under the leadership of the BGR, which was launched in 2000 as the HÜK200 on the occasion of the implementation of the EU Water Framework Directive (EU-WFD). The information from the geological overview map 1:200,000 (GÜK 200) on lithology, stratigraphy and genesis as well as regional maps and specialist knowledge of the SGD formed the basis. In the course of the project, cross-state coordinated hydrogeological information was compiled nationwide and finally made available digitally with a uniform general legend. In 2019, the scale migration took place from 1:200,000 to 1:250,000.