Corridor clearance
The term floor distance describes a difference in height between the surface of the terrain and a groundwater surface .
description
Ground distances are recorded in hydrogeological maps or ground distance maps, but are also processed when creating flood hazard maps . In addition, a possible impairment of underground structures (e.g. basements) or the availability of the existing groundwater for plants can be assessed from the respective corridor distance. The boundary floor distance indicates the maximum possible floor distance for a development of the existing water resources by the respective plant species. Plants root the soil to different depths. For example, wetland plants are on average less than 50 cm away from the ground , while trees are still growing even with three to four meters (e.g. in the urban area of Berlin). Thus, depending on the distance between the corridors, the natural vegetation is different.
Particular attention is paid to areas with a small corridor distance of less than four meters, as the groundwater there can be affected by soil contamination much more quickly than with greater corridor distances. This risk also depends on the nature of the soil layers above the groundwater.
See also
Web links
Individual evidence
- ^ Conseil Régional d´Alsace, State Institute for Environmental Protection Baden-Württemberg: La nappe phréatique rhénane - The groundwater in the Upper Rhine Rift. Edition 04.1998, A.1: Interesting facts about the groundwater in the Upper Rhine Graben . (July 29, 2011).
- ↑ hw-karten.de: Cologne flood risk map . (Accessed July 29, 2011).
- ↑ a b c stadtentwicklung.berlin.de: Corridor distance of the groundwater (2010 edition). (Accessed July 29, 2011).
- ↑ boku.ac.at, University of Natural Resources and Life Sciences, Vienna: Mean corridor distance of the groundwater level (accessed on July 29, 2011).