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Bochum

City in Germany

  • 30 min read
  • 10 chapters
Museumsgebäude und Fördergerüst des Deutschen Bergbau-Museums in Bochum
Thomas Robbin · CC BY-SA 3.0

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Geography

Geographical position

The city lies on the low rolling hills of Bochum land ridge (Bochumer Landrücken), part of the Ruhrhöhen (highest elevations) between the Ruhr and Emscher rivers at the border of the southern and northern Ruhr coal region. The highest point of the city is at Kemnader Straße (Kemnader Street) in Stiepel at 196 metres (643 ft) above sea level; the lowest point is 43 metres (141 ft) at the Blumenkamp in Hordel.

The terrain of Bochum is characterised by rolling hills that rarely have more than three per cent graduation. Steeper graduation can be found at the Harpener Hellweg near the Berghofer Holz nature reserve (3.4%), at Westenfelder Straße in the borough of Wattenscheid (3.47%), or at Kemnader Straße, which begins at the banks of the Ruhr in Stiepel (71 m, 233 ft), and rises to its highest point in the centre of Stiepel (196 m, 643 ft, a 5.1% increase).

The city extends north to south 13.0 km (8.1 mi) and 17.1 km (10.6 mi) east to west. The perimeter of the city limits is 67.2 km (41.8 mi).

It is surrounded by the cities of (in clockwise direction) Herne, Castrop-Rauxel, Dortmund, Witten, Hattingen, Essen and Gelsenkirchen.

Geology

There is sedimentary rock of carbon and chalk. The geological strata can be visited in the former quarry of Klosterbusch in Querenburg and at the Geological Gardens in Wiemelhausen.

Waterways

The urban area is divided into the river Ruhr catchment in the south and the Emscher catchment in the north. The Ruhr's tributaries are the Oelbach (where as well a waste water treatment plant is established), Gerther Mühlenbach, Harpener Bach, Langendreer Bach, Lottenbach, Hörsterholzer Bach and the Knöselbach. The Ruhr in combination with upstream reservoirs is also used for drinking water abstraction. The Emscher's tributaries are Hüller Bach with Dorneburger Mühlenbach, Hofsteder Bach, Marbach, Ahbach, Kabeisemannsbach and Goldhammer Bach. The industrial developments in the region since the 19th century were leading to a kind of division of labour between the two river catchments, pumping drinking water from the Ruhr into the municipal supply system and discharging waste water mainly into the Emscher system. Today approximately 10% of the waste water in the Emscher catchment is discharged via the Hüller Bach. and treated in the centralized waste water treatment plant of the Emschergenossenschaft in Bottrop. The ecological restoration of the Emscher tributaries initiated by the Emschergenossenschaft started with the Internationale Bauausstellung Emscher Park in 1989.

Vegetation

The south of the city has woods, the best known of which are the Weitmarer Holz. These are generally mixed forests of oak and beech. The occurrence of holly gives evidence of Bochum's temperate climate. 844 species of plants can be found within the city limits

Climate

Bochum features an Oceanic climate (Köppen: Cfb; Trewartha: Dobk) characterized by cool winters and short warm summers. Extreme temperatures are uncommon. However, temperatures rising above 30 °C (86 °F) are to be expected on multiple days in summer and the climate station closest to the City did record a peak temperature of 40 °C (104 °F) on July 25, 2019.

On the other extreme, freezing temperatures are common between mid-November and late March. In some years, however, frosts may occur as late as early May. Temperatures below −10 °C are, especially in recent years, only seen on rare occasions. The city lies within the warmer extent of the 8a USDA plant hardiness zone (−12.2 to −9.4 °C or 10 to 15 °F). Some winters may pass without a frost below −5 °C (data from the nearest active climate station). These comparably mild conditions in Winter permit the planting of plants that would either not be reliably hardy or not able to bloom throughout Germany like Trachycarpus palms, Summer lilac, Paulownia tomentosa and Rosemary.

However, winters can be unpredictable with strong fluctuations in temperatures: In mid-February 2021, the city was affected by a severe cold spell bringing temperatures down to –15 degrees Celsius (5 °F) accompanied by heavy snowfall which hindered traffic for multiple days. A week later, a temperature of 17 °C (63 °F) was recorded, an increase of 32K.

The total precipitation of 815mm is distributed relatively evenly through most of the year but has a peak in winter and two minima in late spring and July, respectively. June shows a second peak in precipitation due to the return of the westerlies which leads to more thunderstorms being generated along frontal boundaries of Atlantic low-pressure systems. In recent years, the city was affected by summer and spring droughts. Thunderstorms are not uncommon in the warm season and can generate intense downpours and sporadically hail.

The city experiences little sunshine in winter with a minimum of 1,3h per day in December and a lot more in early summer and late spring with May featuring 7,5h per day. The total amount of sunshine per year is 1689h.

Due to the city’s northern latitude of 51°N, seasonal day-length variation is significant. The longest day of the year, June 21, features 16 h 38 min. of daylight while the shortest day of the year which is December 21 is only 7 h and 50 min. long.

Districts

Bochum is divided into six administrative sections (stadtbezirke), alongside their respective sub-districts (stadtteile), with a total of 362,213 inhabitants living in an urban area of 145.4 km2 (56.1 sq mi).

  • Bochum-Mitte includes Innenstadt, Hamme (including Goldhamme, and Stahlhausen), Hordel, Hofstede, Riemke, Grumme and Altenbochum There are 102,145 inhabitants living in an area of 32.60 km2 (12.59 sq mi).
  • Wattenscheid includes Wattenscheid-Mitte, Leithe, Günnigfeld, Westenfeld, Sevinghausen, Höntrop, Munscheid and Eppendorf (which includes Engelsburg and Heide). There are 74,602 inhabitants living in an area of 23.87 km2 (9.22 sq mi).
  • North includes Bergen, Hiltrop, Gerthe, Harpen (including Rosenberg), Kornharpen, and Voede-Abzweig. There are 37,004 inhabitants living in an area of 18.86 km2 (7.28 sq mi).
  • East includes Laer, Werne, and Langendreer (including Ümmingen and Kaltehardt). There are 55,193 inhabitants living in an area of 23.46 km2 (9.06 sq mi).
  • South includes Wiemelhausen (which includes Brenschede, and Ehrenfeld), Stiepel (which includes Haar, Brockhausen and Schrick) and Querenburg (which includes Hustadt and Steinkuhl). There are 50,866 inhabitants living in an area of 27.11 km2 (10.47 sq mi).
  • Southwest includes Weitmar (which includes Bärendorf, Mark, and Neuling), Sundern, Linden and Dahlhausen. There are 56,510 inhabitants living in an area of 19.50 km2 (7.53 sq mi).

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