Deersheimer Aue
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Deersheimer Aue upper course: Rottebach |
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 The Deersheimer Aue on Hessendamm with an old watchtower |
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| Data | ||
| location | Saxony-Anhalt , Germany | |
| River system | Elbe | |
| Drain over | Großer Graben and Schiffgraben → Bode → Saale → Elbe → North Sea | |
| source | Rottebach south of Danstedt 51 ° 54 ′ 13 ″ N , 10 ° 53 ′ 4 ″ E |
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| Source height | 165 m above sea level NHN | |
| muzzle | south of Mattierzoll Coordinates: 52 ° 2 ′ 50 ″ N , 10 ° 45 ′ 46 ″ E 52 ° 2 ′ 50 ″ N , 10 ° 45 ′ 46 ″ E |
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| Mouth height | 87 m above sea level NHN | |
| Height difference | 78 m | |
| Bottom slope | 3.5 ‰ | |
| length | 22 km | |
| Catchment area | 99.87 km² | |
| Left tributaries | Graben Heudeber, Sohlenbach, Marbecker Bach | |
| Right tributaries | Stiddebach, Höllebach | |
| Small towns | Osterwieck | |
| Communities | North Harz , Winnigstedt | |
| Water body LHW: SAL18OW08-00 and SAL18OW10-11 | ||
 Restoration measure in the estuary area in 2015 |
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The Deersheimer Aue , together with the upper reaches Rottenbach a 23 km long water bodies in the northern Harz region, which in the district of Harz , Saxony-Anhalt runs, in Danstedt starts and east of the Great case stone on Hessen dam in the Great digging ends.
geography
course
The upper course of the Deersheimer Aue is formed by the Rottebach, which is fed from the Koppelgraben south of Danstedt. The height of the source area is 165 m above sea level. NHN . The Rottebach crosses the center of Danstedt, at the end of which it bends sharply to the west. It turns to the north-west, takes up the Heudeber trench flowing in from the left and after about three kilometers meets the Stiddebach flowing in from the north-east, i.e. from the right, at a small wooded area. From here the water is mapped under the name Deersheimer Aue.
After a good one and a half kilometers , the floodplain reaches Zilly , where it takes up a branch of the Sohlenbach on the outskirts. It turns to the north, passes the swimming pool and the place on the eastern edge of the settlement and takes on the Höllebach from the right. The Sohlenbach, which comes from the south, flows in further below Zilly and the floodplain turns to the northwest. Up to the confluence of the Sohlenbach, the Deersheimer Aue is assigned to the SALOW08-00 water body as the upper course. Below the Sohlenbach, the section known as the underflow begins with the water body designation SAL18OW10-11.
Half a kilometer below the confluence of the Sohlenbach, the floodplain reaches the Aumühle on federal road 244 , a little later takes up the Marbeck Brook coming from the south-west and continues to flow through intensively agricultural area to the edge of the forest south of the eponymous town of Deersheim . There it turns to the north and receives a flow from the Westerbeekgraben from the west. It passes Deersheim on the east side and swings to the north-northeast, then to the north-northwest. The next town, Hesse, is also on the west bank of the brook, which has now grown into a small river. It is crossed at the Steintor by federal road 79 , which follows the stream on Hessendamm below the town . The floodplain reaches the Großer Bruch and, together with the Schiffgraben-Ost flowing in from the west, forms the Großer Graben and the border to Lower Saxony . A memorial plaque for the opening of the border in 1989 has been erected on Hessendamm. About half a kilometer above, the Deersheimer Aue already feeds the Oberer Beiläufer, which flows parallel to the Großer Graben .
Catchment area and length information
The official water body data sheet specifies a length of 19.6 km for the upper reaches. On the map of the state of Saxony-Anhalt, the Rottebach is about 4.5 km long and the section between Stiddebach and Sohlenbach about 3.5 km long, making a total of about eight kilometers. The data sheet may also take into account the lengths of other tributaries. The upper course is assigned to the river type "7: Coarse material-rich, carbonate low mountain stream " . Its catchment area is 58.24 km².
The lower reaches has a length of 14.4 km and a catchment area of 41.63 km², it is assigned to the river type “6: Fine material rich, carbonate low mountain range”.
Elbe-Weser watershed
The Deersheimer Aue belongs to the catchment area of the Elbe . On the west side of the Großer Fallstein , the Zieselbach flows to the Ilse , which in turn drains to the Weser via the Oker and Aller . The fall stone thus forms a watershed between the two catchment areas. The ship ditch divides here into the ship ditch west and the ship ditch east.
Water quality
The monitoring of water quality and water development within the framework of the European Water Framework Directive is the responsibility of the State Office for Flood Protection and Water Management Saxony-Anhalt, which published a water report with tables and maps as well as data sheets on surface water bodies in 2008 and 2013. While the upper course water body is still rated “unsatisfactory” for the ecological potential, this is rated “bad” for the lower course. This is due to the poor biological quality, i.e. underdeveloped flora and fauna, and the poor structure . The latter is classified as "significantly changed" (HMWB), due to a canal-like course and the predominantly missing bank vegetation. The chemical assessment for both water bodies is “not good”, which is mainly due to an excessively high nitrate content. The nitrate input usually takes place through agricultural fertilizers.
Web links
- Water report on surface water 2008-2013 - tabular part , State Office for Flood Protection and Water Management (LHW) Saxony-Anhalt, State Service for Water Sciences, on lhw.sachsen-anhalt.de
- OWK data sheets Data sheets for all surface water bodies in Saxony-Anhalt
Individual evidence
- ↑ Your mountains online converter coordinates. Retrieved February 28, 2018 .
- ↑ LGLN : Topographic Map 1: 50,000 , as of 2000, CD-ROM Top50 Viewer
- ↑ a b c Saxony-Anhalt Viewer. Retrieved February 27, 2018 .
- ↑ a b c OWK data sheets. (PDF) State Office for Flood Protection and Water Management Saxony-Anhalt, pp. 573-576 , accessed on February 27, 2018 .
- ↑ At maps.google.de the name Rottebach is used up to the confluence of the Sohlenbach.
- ↑ Report on the nature of rivers and lakes in Saxony-Anhalt 2009-2013. (PDF) State Office for Flood Protection and Water Management Saxony-Anhalt, p. 103 , accessed on February 27, 2018 .