Verlorenes Wasser
As water is lost, partly as a proper name, but also as slang generic term, several streams along the right edge of the Elbe in Saxony boiler referred to seep often after only a few 100 meters of their course again. In hydrogeology, this process is called induction.
Dissemination
Lost water there is in Dresden, Radebeul and Coswig. They are found on a 20 -kilometer section of the northern border of the Elbe valley boiler, which further extends from the Dresdner Heide about the Heller to Loessnitz and beyond in the Friedewald. The flow direction of this brief waters normally runs at right angles to the slopes of the Elbe valley, so frequently from north to south. They aspire to the same or Prießnitz but seep before. This process is very atypical for a total of central Germany. For similar reasons, but also streams in the flaming and the Harz bear the name of lost water.
Causes
Geology and soil
For the rapid percolation there are several reasons. The main cause is the natural geology of the area, namely the transition from a water-impermeable to a permeable surface. The streams have their origin in the plate located on the Lusatian, rocky plateaus north of Dresden. They come from either dump ends springs or wells overflows and Dränungen and often begin in flat meadow hollows. Then they worked their way into the fitting here syenite or granodiorite rocks, forming V-shaped valleys, in the course of the lost water normally cross the Lusatian fault and hit a sand terrace. This was taken during the Elster glacial period and represents a debris cone of a large glacier runoff to the south is, which reached a natural reservoir located there at that time in the Elbe valley kettle and settled in fluvial sediments. Soon after the streams have reached the permeable sandy soil, they seep and thus revert back into the groundwater.
Amount of water of the streams
Significantly acts here from the normally very low water levels in the streams. Even so it is possible the sandy bottom, permanently absorb the entire amount of water. Although larger streams such as the Prießnitz or the Loessnitz Bach also meet on the sand terrace, but lead to much water to seep away completely. Therefore they reach their permanent outfall and in this long section are therefore the only right tributaries of the Elbe.
However, the water supply of the lost water varies quite strong. This depends on the seasons and particularly short of rainfall from and has an influence on the streams that strive in the area of the Dresdner Heide Prießnitz itself. Mainly in heavy rain or thaw they can temporarily reach their near outfall, but otherwise seep well. In contrast, the other lost water never penetrate to the Elbe, as it extends several kilometers away in the middle or even near the southwest side of the Elbe valley boiler.
Earlier forest use types
The periodic drying up of streams may sometimes also by former types of forest use be caused, for example, the cluster computing. This leaves, twigs and moss were swept up and collected in order to find a use as livestock litter on the forest floor. However, the removal of this layer promoted the exposure of the loose sandy soil and reinforced so that the seepage.
Examples
- Lost water from the Virgin reason Albert City, Dresdner Heide
- Sandschluchtflüsschen in Klotzsche, Dresdner Heide ( reaches the Prießnitz times)
- Kretzschelgrundbäche in Klotzsche, Dresdner Heide ( reach the Prießnitz times)
- Klotzscher village stream, the center Altklotzsche, Heller
- Olterbach in Rähnitz at the Dresden -Hellerau the Federal Highway 4, Heller
- Lost water, when Wilschdorfer cultivation, boy Heath
- Bach in Boxdorfer reason on the tree lawn, boy Heath
- Nesselgrund in Boxdorf, boy Heath
- Fiedler Bach, in Radebeul- Oberlößnitz ( in Fiedler reason), Young and Heath Loessnitz
- Croats reason Radebeul- Obernaundorf, Loessnitz
- Rietzschke, Rietzschkegrund, Radebeul - Zitzschewig, Loessnitz
- Parish reason Coswig Friedewald