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Generalised hydrogeological map of Lower Saxony, 1 : 200 000 - Groundwater cover protection potential   (HUEK200SPGW)

The "Generalised hydrogeological map of Lower Saxony, 1 : 200 000 - Groundwater cover protection potential" evaluates the properties and thickness of the local rocks in terms of their capacity to protect the upper aquifer against the ingress of potential pollutants (Vulnerability map). Groundwater is regarded as protected in cases where low-hydraulic conductivity strata above the groundwater body prevent infiltration and large groundwater-surface distances favour an extended residence time.

The protection potential is summarised in three classes, in which various substance-degradation properties of the rocks in the groundwater cover are summarised.

• Low:

< 1 m low-hydraulic conductivity rock (clay, silt) or;

< 5 m permeable rock (fine- to medium sand) or;

< 10 m highly permeable rock (coarse sand, gravel, jointed or karstified consolidated rock).

• Moderate:

1 - 5 m low-hydraulic conductivity rock (clay, silt) or;

5 - 10 m permeable rock (fine- to medium sand) or;

> 10 m highly permeable rock (coarse sand, gravel, jointed or karstified consolidated rock).

• High:

> 5 m low-hydraulic conductivity rock (clay, silt) or;

> 10 m permeable rock (fine- to medium sand).

In principle, groundwater is protected against the ingress of potential pollutants, transported as a liquid phase or dissolved in the infiltrating precipitation, wherever low-hydraulic conductivity strata above the groundwater body prevent infiltration and large groundwater-surface distances favour an extended residence time, allow degradation process to become active.

Roughly speaking, three substance groups can be differentiated:

• biodegradable substances (e.g. certain organic compounds, nitrogen compounds);

• adsorbable substances (e.g. certain organic compounds, heavy metals, a number of cations of salts);

• persistent substances (e.g. certain organic compounds).

A number of criteria must be considered in relation to degradation processes enhanced by long residence times in the unsaturated zone:

• the viscosity of liquid phases plays an important role, thin phases can infiltrate easily, while pasty phases are easily retained in the ground;

• solid phases in the rock or at the surface are washed out at different rates, depending on solubility;

• in terms of substance adsorption, the available surface areas of clay minerals and the organic carbon content play a primary role.

The infiltration capacity of aqueous solutions depends on the whole on the hydraulic conductivity of the infiltrated rock. In turn, this depends on the effective void space, determined in unconsolidated rock by the pore space and in consolidated rock by interconnected joints, bedding and solution cavities.

Those regions in which the residence times of pollutants is short and only very little or no adsorptive surfaces are available as a result of the very thin potential barrier rocks, or the absence of them, (clay, silt), or because of small groundwater-surface distances, are classified as 'low'. Substance degradation process (degradation, adsorption) are therefore almost impossible.

Those regions in which the residence times of pollutants is moderate and only few adsorptive surfaces are available as a result of the moderately thin potential barrier rocks (clay, silt), or because of moderate groundwater-surface distances, are classified as 'moderate'. Substance degradation process (degradation, adsorption) are therefore possible to a limited degree.

Those regions in which the residence times of pollutants is long and extensive adsorptive surfaces are available as a result of the thick potential barrier rocks (clay, silt), or because of large groundwater-surface distances, are classified as 'high'. Extensive substance degradation process (degradation, adsorption) are therefore possible.

Potential cleaning processes in the groundwater-filled zone are not taken into consideration. Consolidated rock regions were assessed on the basis of the groundwater transport capacity of the shallow rocks.

Informations about data

Deutschland Übersichtskarte mit Position
 
Aktuelle Position

  • Editing state: Erfassung bzw. Erstellung der Daten ist abgeschlossen (completed).
  • Date of last publication: 01.01.1982
  • Information about data origin:

    An Datengrundlagen sind eingegangen:

    - Geologische Übersichtskarte im Maßstab 1:200 000

    - Bohrungen der Bohrdatenbank Niedersachsen

    - Bewertungsschema zum Schutzpotenzial

Contact person

Phone:   +49 511 643-3613
Fax:   +49 511 643-533613

Organisation:
Landesamt für Bergbau, Energie und Geologie (LBEG)
Stilleweg 2
30655  Hannover (Niedersachsen)
Deutschland
Fon: +49 511 643-0
Fax: +49 511 643-2304
Email:
Web: http://www.lbeg.niedersachsen.de/


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To access the data online you can use the following applications/services:

Distribution information

Common informations (order proccess, product choise, prices):

Kostenfreier Download über den NIBIS-Kartenserver oder Kosten über den Datenvertrieb des LBEG entsprechend der Gebührenordnung

Data formats

  • ArcGIS-Shapefile  ( Version:   unknown)
  • JPEG  ( Version:   unknown)
  • PDF  ( Version:   unknown)
  • TIFF  ( Version:   unknown)

Data medium

  • DVD (dvd)
  • CD-ROM (cdRom)
  • Ausdruck (hardcopy)

Distribution contact

Phone:   +49 511 643-3354
Fax:   +49 511 643-533354

Organisation:
Landesamt für Bergbau, Energie und Geologie (LBEG)
Stilleweg 2
30655  Hannover (Niedersachsen)
Deutschland
Fon: +49 511 643-0
Fax: +49 511 643-2304
Email:
Web: http://www.lbeg.niedersachsen.de/


Additional information about the data

  • Format of data: digitale Karte in Raster- oder Vektorform (mapDigital)
  • Topic: Geowissenschaften (geoscientificInformation)
  • Key words: inspireidentifiziert, sgd_Hydrogeologie, opendata, NIBIS-Metadaten, opendata
  • Key words GEMET: Geology
  • Thesaurus name: GEMET - INSPIRE themes, version 1.0
  • Thesaurus date of puplication: 2008-06-01
  • Geometry type: Fläche (surface)
  • Scale: 1:200000
  • Coordinate system: 4647; ETRS89 / UTM zone 32N (zE-N) (Europäisches Terrestrisches Referenzsystem von 1989 / Universale Transversale Mercatorabbildung Zone 32N)
  • Altitude reference system: DE_DHHN92_NH
  • Reference layer: Datenbestand (dataset )
  • Language: ger
  • Character set: utf8

Access- and security restrictions

  • Security classification: unbeschränkt (unclassified)
  • Restriction of application: Es gelten keine Zugriffsbeschränkungen.

Information about content (auto detected)

  • Amount datasets/features: keine Angabe
  • Spacial notation: vector
  • Eastern longitude: 6.5475   to   11.7416
  • Northern latitude: 51.225   to   53.9343

*1EPSG codes are used to combine transformation parameters.   More information  ...

About this data description

  • Metadata standard: Standard   ISO 19115 ,  version   ISO 19115:2003/Cor. 1:2006 (E)
  • Metadata status: 10.12.2024
  • Metadata language: ger
  • Metadata character code: utf8

Metadata contact

Organisation:
Landesamt für Bergbau, Energie und Geologie (LBEG)
Stilleweg 2
30655  Hannover (Niedersachsen)
Deutschland
Fon: +49 511 643-0
Fax: +49 511 643-2304
Email:
Web: http://www.lbeg.niedersachsen.de/