Warn

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Warn
The Warne flows into the Oker near Dorstadt

The Warne flows into the Oker near Dorstadt

Data
Water code DE : 48254
location Lower Saxony , Germany
River system Weser
Drain over Oker  → Aller  → Weser  → North Sea
source Döhrenberg in the state forest of Liebenburg
52 ° 1 ′ 30 ″  N , 10 ° 23 ′ 49 ″  E
Source height approx.  200  m above sea level NHN
muzzle At Dorstadt in the Oker coordinates: 52 ° 5 '53 "  N , 10 ° 34' 16"  E 52 ° 5 '53 "  N , 10 ° 34' 16"  E
Mouth height 82  m above sea level NHN
Height difference approx. 118 m
Bottom slope approx. 4.8 ‰
length 24.5 km
Catchment area 99.8 km²
Left tributaries Fuchsbach
Right tributaries Ostwinkelbach, Stobenbergbach, Krummbach
Big cities Salzgitter (-Bad)
Communities Liebenburg , Gielde , Werlaburgdorf , Heiningen , Dorstadt

The Warne is an approximately 24 km long, left-hand or western tributary of the Oker in Lower Saxony ( Germany ), which rises near Salzgitter-Bad .

geography

The brook, which runs in the independent city of Salzgitter and in the district of Wolfenbüttel , rises south of Salzgitter-Bad at the transition from the northern to the southern central part of the Salzgitter ridge . Its source is located in the Liebenburg State Forest between Liebenburg and Salzgitter-Bad. The upper course often falls dry, only the inflow from the Plünnekenbrunnen ensures a steady flow of water. From there it flows through the old town of Salzgitter-Bad. However, the Warne has been piped within the city since 1955 and only comes to the surface again at the eastern exit. It is the receiving water of the Salzgitter-Bad sewage treatment plant. From here it runs u. a. via Gielde and Werlaburgdorf (both districts of the municipality of Schladen-Werla ) to the east. It is crossed by the 130-meter-long Warnetalbrücke on the A 36 , where there are rest areas on both sides. Furthermore, it flows around the Oderwald on its southeast side and to the north parallel to the Oker to Dorstadt ( joint municipality Oderwald ). In this village it bends to the east and flows into the manor park of the manor in the Oker coming from the south . The course is mostly canalized. Short sections have only been renatured at the level of Werlaburgdorf and Heiningen .

In the section between Groß Mahner and Gut Nienrode , the former Mahner pond was converted into a retention basin in order to improve flood protection.

The Warnetalbahn , which runs along the stream, bears its name after the Warne .

Water quality

The water structure quality is the NLWKN judged to be poor. 60% of the river is assigned to class VI, which means "severely damaged", and 30% even to class VII. The river bed is partially concreted, piped or filled with stones and the course of the river, except for the renaturation sections, is mostly straightened and without bank trees. Throughout the course there are still several falls that hinder the migration of organisms. Sometimes the fields extend directly to the water, so that there is no balanced bank vegetation.

The water quality is reduced by the inputs from intensive agriculture and at most reaches water quality class II-III, ie "significantly impaired". In addition, there is the outflow from the SZ-Bad sewage treatment plant and the existing mixed water system in Salzgitter-Bad. This leads to strong fluctuations in the runoff and to disturbances of the flora and fauna. The chemical quality is assessed in the current water body data sheet as "bad", which is justified by the natural salt content but also by heavy metal pollution.

Web links

Commons : Warne  - collection of pictures, videos and audio files

Individual evidence

  1. ↑ a b Topographic map 1: 50,000 Land of Lower Saxony
  2. ↑ a b NLWKN , inventory of the implementation of the EU Water Framework Directive, surface water processing area Oker, draft (status: November 22, 2004), also C_Bericht_Oker_041222.pdf, accessed February 1, 2010
  3. ↑ NLWKN : Water quality report Oker 2002 , Braunschweig 2002, source PDF file 8 MB
  4. ↑ NLWKN : Water body data sheet 15021 Warne , as of 2012, NLWKN website on the EU Water Framework Directive, accessed on May 24, 2013.