Groundwater non-conductor

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With groundwater non-conductor , or Aquifuge be in the Hydrogeologie the layers referred to a ground conductive layer ( aquifer limit), and even not, or hardly permeable to water. The frequently used definition of DIN 4049-3 (from 1994) defines it as “rock that is impermeable to water or may be viewed as impermeable from the perspective of the respective point of view”. It should be noted that this definition is defined in terms of the application or question. A rock that is regarded as a groundwater non-conductor for the purpose of drinking water abstraction, can be used as a groundwater lower level (also groundwater inhibitor, or aquitarde) for other purposes, for example when sealing landfills or contaminated sites . Accordingly, it is impossible to specify a fixed threshold value for the permeability of unconsolidated or solid rock, which would have to be regarded as a threshold between aquifers or aquifers. Threshold values ​​often given in the literature are in the range of 10 −8 to 10 −9 meters per second. Due to this lack of clarity, it has recently been recommended to drop the term entirely.

Typical groundwater non-conductors as solid rock (fissured aquifers) are metamorphites and claystone , both with permeability of the order of 10 −9 meters per second and below. Sometimes a distinction is made between de facto impermeable rocks or aquifuge and rocks with very low permeability or aquicluden (many mudstones).

Groundwater aquifers lying under groundwater barrier layers and groundwater non-conductors can lead to artesian confined groundwater that, when exposed, e.g. B. in a borehole, as an artesian well comes to light.

Individual evidence

  1. ↑ World Meteorological Organization (Ed.): International Glossary of Hydrology. WMO, 2012, ISBN 978-92-3-001154-3 , p. 18.
  2. ↑ quoted from: Frank Wisotzky, Nils Cremer, Stephan Lenk: Applied groundwater chemistry, hydrogeology and hydrogeochemical modeling: Fundamentals, applications and problem solutions. 2nd Edition. Springer Spectrum, Berlin 2018, ISBN 978-3-662-55557-6 , p. 486.
  3. ^ Ingrid Stober, Andreas Gautschi: Geringleiter. Special issue. (= Groundwater - Journal of the Hydrogeology Section. Volume 22). 2017, pp. 163–164. doi: 10.1007 / s00767-017-0367-y
  4. ↑ Rolf Mull, Hartmut Holländer: Groundwater hydraulics and hydrology: An introduction. Springer Verlag, Berlin et al. 2002, ISBN 3-540-43942-0 , p. 36.
  5. ^ Hans-Gustav Olshausen, VDI-Gesellschaft Bautechnik (Ed.): VDI-Lexikon Bauingenieurwesen. Springer Verlag, Berlin et al. 1991, ISBN 3-662-30425-2 , groundwater non-conductor on p. 259.
  6. ^ Helmut Prinz, Roland Strauss: Engineering Geology. 5th edition. Spektrum-Springer, Heidelberg 2011, ISBN 978-3-8274-2472-3 , pp. 179-180.

literature

  • Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU) (Hrsg.): Groundwater in Germany. (= BMU series environmental policy. ). August 2008.