Dadau

Dadau
Mouth in Cornau (Drebber) in the Hunte
Basin countries Germany
Location Lower Saxony
Length 16.6km
Source elevation 7m
Mouth elevation 33m above sea level

The Dadau is a tributary of the river Hunte. For the most part of its upper course it forms the border between the administrative districts of Diepholz and Vechta and for a lesser part of its lower course it forms the border between the town of Diepholz and Barnstorf Samtgemeinde.

Route

The 16.6 km long Dadau has its source in the Diepholzer Moorniederung in Südlohner Moor near the town of Lohne. Then it flows northwards between Südlohner, the Brägeler Moor to the west and the Aschener Moor to the east and kinks at the border of Lohne and Vechta on its left bank and heads east. Behind Bundesstraße 69 the Dadau flows in an easterly but sometimes south-easterly direction. In the final section it runs through in full latitude (upstream its right bank belongs to Diepholz) the municipal area of Drebber. The Dadau joins the Hunte, and a few metres east of Bundesstraße 51 in Cornau, a part of Drebber. The Hunte carries on flowing northwards towards Oldenburg. Between the Hunte and the Dadau is Deckau also a part of Drebber.

In 2003 the towns of Vechta and Diepholz as well as the municipal area of Drebber decided to match their borders with the current route of the Dadau. In 2004 the administrative districts which would have been affected, agreed to the change of their borders. Altogether Diepholz was increased in size by 0.8323 ha (8323sq mi) at the Vechta's expense.[1]

Historical Meaning

Near to the mouth of the Dadau the water castle of Cornau, the castle of the district Diepholz as part of the Holy Roman Empire, was located between the Dadau and the Hunte, from where the area was ruled up until the castle in Diepholz was constructed. There was a moat to the west of the castle Cornau, which closed the gap between Dadau and Hunte. The rest of the moat was filled up in 1962. The castle has been falling into ruin since the 15th century. Until 1751 its remains were removed.[2]

The Dadau has since Reformation Times been marking the border of areas with a predominantly Roman Catholic population from other areas with a predominantly Evangelical, Lutheran population. To the west of this border lay the Niederstift Münster, the Free State of Oldenburg with the region of Oldenburger Münsterland as well as the Regierungsbezirk Weser-Ems in Lower Saxony. To the east of the border is the district of Diepholz, The Kingdom of Hanover, The Kingdom of Prussia as well as the Regierungsbezirk Hannover in Lower Saxony.

Nature Reserves

The Dadau cross and borders the nature reserves of Südlohner Moor, Aschener Moor/Heeder Moor, Boller Moor and Lange Lohe, it touches the natural reserve of Drebbersches Moor.

Water Quality

In 2004 the Dadau's and adjacent streams' water quality were valued negatively by qualified public authorities in Lower Saxony: "The organically and sand-filled lowland streams of the western Duemmer's depression were graded as moderate to unsatisfactory. Fastidious organisms, who could indicate a good condition, were hard to find. A relatively high amount of moors were run through [by affected streams]. Due to mostly intensive drainage of the moor areas, the waters are more or less influenced by swamp water. The released swamp-like substances from humans have led to high organic charges of the waters. Iron and nutrients have been released to a considerable extent and have led to eutrophication of consumptive oxide degradation processes and sapropel formations. This process will be benefited by minor shading and reducing the flow rate through jams and pipe colverts."[3]

The "Integrated rural development concept" (ILEK) [Districts] Vechta/Central-South[4] provides a revitalisation, the "Integrated urban development concept (ISEK) of Lohne[5] a renaturation of the Dadau.

Literature

See also

Coordinates: 52°40′N 8°28′E / 52.667°N 8.467°E / 52.667; 8.467

References

  1. ↑ Landkreis Diepholz: Vorlage 115/2004 für die Kreistagssitzung am 25. Oktober 2004
  2. ↑ Stefan Mehrholz: Die Burg
  3. ↑ Bezirksregierung Weser-Ems / Niedersächsischer Landesbetrieb für Wasserwirtschaft, Küsten- und Naturschutz (NLWKN): Bestandsaufnahme zur Umsetzung der EG-Wasserrahmenrichtlinie Oberflächengewässer. Bearbeitungsgebiet Hunte. 21. Dezember 2004, S. 20
  4. ↑ Grontmij GmbH
  5. ↑ Grontmij GmbH: Integriertes Stadtentwicklungskonzept für die Stadt Lohne - ISEK Lohne 2030 - Erläuterungsbericht. 29. November 2012, S. 66
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