Lost water
As Lost water several streams at the right edge of the are, in part, as a proper name, but also as a colloquial collective term, Dresden Basin in Saxony called that often seep back after a few 100 meters of its course. In hydrogeology this process is called influenza .
distribution
There is lost water in Dresden , Radebeul and Coswig . They can be found on an approximately 20 km long section of the northern edge of the Elbe valley, which stretches from the Dresdner Heide over the Heller to the Lößnitz and beyond into the Friedewald . The direction of flow of these short bodies of water is usually at right angles to the slopes of the Elbe Valley, i.e. heaped from north to south. They strive towards the Elbe or the Prießnitz , but seep away first. Overall, this process is very atypical for Central Germany . For similar reasons, brooks in Fläming and Harz also bear the name Lost Water.
causes
Geology and soil
There are several reasons for the rapid infiltration . The main cause is the natural geological composition of the area, namely the transition from a water-impermeable to a permeable subsoil. The streams have their origin in the rocky plateaus north of Dresden on the Lausitzer Platte . They come from either descending springs or well overflows and drainages and often begin in shallow meadow hollows . Then they worked their way into the adjacent syenite or granodiorite rock and formed notch valleys , in the course of which the Lost Waters usually cross the Lusatian Fault and meet a sandy terrace. This emerged during the Elster Cold Age and represents an alluvial cone of a large glacier runoff to the south, which reached a natural reservoir in the Elbe valley and deposited fluvial sediments in it . Soon after the brooks have reached the water-permeable sandy soil , they seep away and return to the groundwater.
Amount of water in the streams
The normally very low water flow of the streams has a significant effect here. This is another reason why the sandy soil is able to permanently absorb the entire amount of water. Larger streams such as the Prießnitz or the Lößnitzbach also meet the sand terrace, but lead too much water to completely seep away. That is why they permanently reach their receiving waters and are the only right tributaries of the Elbe in this long section.
However, the water flow of the lost water fluctuates quite strongly. This depends on the seasons and, in the short term, particularly on precipitation, and has an impact on small streams that strive towards the Prießnitz itself in the Dresden Heath area. Mainly in heavy rain or thaw, they can temporarily reach their nearby receiving waters, but otherwise seep away as well. In contrast, the other Lost Waters never penetrate as far as the Elbe, as it runs several kilometers away in the middle or even near the southwest side of the Elbe valley.
Previous types of forest use
The periodic drying up of the streams may be partly due to former types of forest use, for example the litter rake. Leaves, twigs and moss were swept up on the forest floor and collected to be used as cattle litter. The removal of this layer, however, promoted the exposure of the loose sandy soil and thus increased the seepage.
Examples
- Lost water from the Jungferngrund, Albertstadt , Dresdner Heide
- Sand gorge river, near Klotzsche , Dresdner Heide (reaches the Prießnitz temporarily)
- Kretzschelgrundbach, near Klotzsche, Dresdner Heide, (sometimes reach the Prießnitz)
- Klotzscher Dorfbach, town center Altklotzsche, Heller
- Olterbach, near Rähnitz at the Dresden- Hellerau junction of the federal motorway 4 , Heller
- Lost water, at the Wilschdorf cultivation , Junge Heide
- Brook in the Boxdorfer Grund, on the Baumiese, Junge Heide
- Nesselgrund, near Boxdorf , Junge Heide
- Fiedlerbach , near Radebeul- Oberlößnitz (in Fiedlergrund ), Junge Heide and Lößnitz
- Strakener source system in Strakengrund , Radebeul- Wahnsdorf and -Oberlößnitz, Lößnitz
- Kroatengrund, Radebeul- Naundorf , Lößnitz
- Rietzschke , Rietzschkegrund , Radebeul- Zitzschewig , Lößnitz
- Pfarrgrund, Coswig , Friedewald
See also
swell
- Lössnitz and Moritzburg pond landscape (= values of our homeland . Volume 22). 1st edition. Akademie Verlag, Berlin 1973.
Individual evidence
- ↑ fvv-brueck.de
- ↑ Langestein-harz.de ( Memento of the original from July 23, 2007 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice.
