Boye (river)

from Wikipedia, the free encyclopedia
Boye
The Boye crosses the Oberhausen – Hamm railway line in its lower course

The Boye crosses the Oberhausen – Hamm railway line in its lower course

Data
Water code DE : 27726
location North Rhine-Westphalia , Germany
River system Rhine
Drain over Emscher  → Rhine  → North Sea
source Southwest of Kirchhellen
51 ° 35 ′ 35 ″  N , 6 ° 54 ′ 6 ″  E
Source height 58  m above sea level NN
muzzle West of Karnap in the Emscher Coordinates: 51 ° 30 '47 "  N , 6 ° 59' 23"  E 51 ° 30 '47 "  N , 6 ° 59' 23"  E
Mouth height 34  m above sea level NN
Height difference 24 m
Bottom slope 1.7 ‰
length 13.8 km
Catchment area 74.358 km²
Left tributaries s. u.
Right tributaries s. u.
Big cities Bottrop , Essen , Gladbeck

The Boye is the largest right and, overall, the second largest tributary of the Emscher . The Boye River system includes all of the flowing waters that flow into the Boye, as well as the 13 km long Boye itself.

A total of 90 km of streams drain a 77 km² area in the area of ​​the cities of Bottrop and Gladbeck in the Ruhr area . The effects of coal mining gave and still give the brook system an unusually eventful recent history.

course

The upper course

The Boye rises southwest of Bottrop- Kirchhellen in Holthausen and initially flows naturally on the Bottrop district through forest and agricultural areas in south to south-south-east directions.

Between Bottrop- Grafenwald in the west and the Gladbeck districts Rentfort and Ellinghorst , shortly after the Brabecker Mühlenbach flows into it from the left / north and after crossing the A 31 parallel to it , the Spechtsbach flows into it from the right / west. From then on, its course represents the city boundary between the two cities, as which it soon crosses the A 2 .

A current subsidence area of ​​the coal mining from the Prosper-Haniel mine, which was still active here until 2018 , repeatedly creates new problems with the receiving water (the gradient). Old and new pumping stations therefore accompany the route of the Boye and its tributaries. Entire streams have to be artificially created to avoid swamping (e.g. Töfflinger Bach, completed 2005). As in many other areas of the northern Ruhr area, the pumps will have to remain in operation forever ( perpetual costs of hard coal extraction).

The "epicenter" of future subsidence is north of Bottrop-Grafenwald (Am Schleitkamp), not far from a new development area from the 1980s / 1990s: here, a surface subsidence of eight to ten meters is expected in the foreseeable future. This is where the interests of local residents and environmental associations on the one hand and the dismantling wishes of Deutsche Steinkohle AG (a subsidiary of RAG ) collide on the other. The difficult discussion process is mediated by the city of Bottrop and the district government of Münster.

The lower course

The first few meters in the concrete channel, near the A2

Shortly before crossing under the A2, the Boye changes its image. It is now a gutter made of concrete shells with open drainage of dirty water. The tributaries Vorthbach, Liesenfeldbach, Kirchschemmsbach, Haarbach, Liesenfeldbach, Wittringer Mühlenbach along with Nattbach and Hahnenbach already reach the Boye as so-called " Köttelbecken " or in a low position between sheet pile walls.

Salty, warm deep water from mining, industrial and household wastewater, but also discharges from agriculture mix with pure and groundwater and nourish a characteristic odor bell. The flow speed in the concrete channels is high; with strong water flow, 12 km / h can be achieved despite the slight gradient.

Direct discharge of polluted water

High dykes, built from waste material from mining, accompany the lower reaches and protect the mostly lower lying surrounding area from flooding. For security reasons the boye is fenced off here; one can only risk a look and a fed up on overpasses.

The (former) Boye Estuary

The open sewerage system was forced at the beginning of the 20th century by subsidence caused by coal mining: On the one hand, there was no longer any natural runoff; the landscape was becoming increasingly boggy, and cholera epidemics loomed in the densely populated area. On the other hand, guidance in underground pipes was technically out of the question because of the constant massive ground movements. Where the mountain subsidence reached the groundwater level, the last option was to raise the runoff, connected with pumping stations.

A good 2.5 km south of the point where the Bottrop city limits to Essen replaced those to Gladbeck on the river, the Boye (originally) flowed into the Emscher. At this point there is only an overflow basin for flooding today; the main cargo is diverted 300 meters beforehand and is finally pumped up to the Emscher sewage works in Bottrop via eight meter high risers . The Bottrop-Boy pumping station can handle up to 42,000 liters of water per second.

use

Before the Boye served as a sewer for the densely populated residential areas of Bottrop, the city of Bottrop decided to use the water of the stream for the first outdoor swimming pool in the city. The Stenkhoffbad was opened on July 23, 1924 . The existing swimming pool was fed by Boyewasser, which had to be cleaned separately this year.

The rebuilding of the Boye system

The Emschergenossenschaft informs about the conversion of the Boye system

With the north migration of coal mining, the soil in the lower reaches of the Boye system has come to rest. It is now also technically possible to send the wastewater after separation from the pure water into underground pipeline systems in order to then remodel the surface water in a more natural way. This is currently being carried out by the Emschergenossenschaft at great expense as part of the project to convert the Emscher system. First, many tributaries, later the Boye itself, are unsealed. The cesspools, which are still dead, are ecologically upgraded and have an accompanying system of paths; their separating effect is canceled. The main sewage collector is injected laterally below the Boye and has a diameter of 4 meters; it is to be fed directly into the Bottrop sewage treatment plant. Construction began in 2013. The reconstruction of backwaters has already made good progress in many areas. This work should be completed by the end of 2012.

Tributaries

The following brooks flow into the Boye (tributary side, length, catchment area):

See also

Individual evidence

  1. ↑ a b German basic map 1: 5000
  2. ↑ a b c Topographical Information Management, Cologne District Government, Department GEObasis NRW
  3. ↑ The Stenkhoffbad is experiencing a weak season this time. The first swimmers jumped into the pool full of boye water in 1924. Retrieved October 27, 2013
  4. ↑ Pages of the Emschergenossenschaft ( Memento of the original dated November 13, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.abwasserkanal-emscher.de
  5. ↑ The designated sub-catchment area 277265 of the Boye (6,091 km²) contains small parts of other bodies of water in addition to the stream.

Web links

Commons : Boye  - collection of images, videos and audio files