Hydrogeological overview map of Lower Saxony 1: 500 000 — Permeability of near-surface rocks (WMS service)

The map shows the permeability of the near-surface rocks in a scale of 1:500 000. The rock units of the Geological Survey Map 1:500,000 (GUEK500) have been divided into three permeability groups, which were defined according to a rough assessment of the effective cavity proportions and using the information available from hydraulic investigations. This assessment is based on the classification of mountain permeability, as given by the Working Group Hydrogeology of the State Geological Services in its hydrogeological carting instructions (Grimmelmann et al. 1997). The gross allocation of the permeability coefficients is carried out as follows: — Low permeability corresponds to permeability coefficients of < 1-10-5 [m/s],— — Mean permeability corresponds to the range of permeability coefficients from 1-10-5 [m/s] to 1-10-4 [m/s], — High permeability corresponds to permeability coefficients of > 1-10-4 [m/s] and — Permeability highly variable means that the corresponding rock complex has such different properties that it can be clearly assigned to any group. The map presented here was created by reattributing the contents of the Geological Overview Map of Lower Saxony 1: 500 000 and thus, as a rule, only takes into account a depth range of about 2 m below the top of the terrain.