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Hengsteysee
The HENGSTEYSEE (Lake Hengstey) is a reservoir on the Ruhr river between the cities of Hagen
Hagen
, Dortmund
Dortmund
and Herdecke , North Rhine-Westphalia , Germany
Germany
. It was built in 1929 and is one of five reservoirs on the Ruhr. The reservoir is about 4.2 km (2.6 mi) long and has an average width of 296 meters (971 ft). It begins near the point where the Lenne flows into the Ruhr, and ends with the weir and hydroelectric plant of Hengsteysee. The Klusenberg , a hill that is part of the Ardey range, is located just north of the Hengsteysee. There is also a pumped-storage plant on this reservoir, named Koepchenwerk after Arthur Koepchen
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Weir
A WEIR /ˈwɪər/ is a barrier across the horizontal width of a river that alters the flow characteristics of the water and usually results in a change in the vertical height of the river level. There are many designs of weir, but commonly water flows freely over the top of the weir crest before cascading down to a lower level. CONTENTS * 1 Etymology * 2 Function * 2.1 Flow measurement * 2.2 Control of invasive species * 2.3 Watermills * 2.4 Flood control and altering river conditions * 3 Issues * 3.1 Ecology * 3.2 Fish migration * 3.3 Safety * 4 Common types * 4.1 Broad-crested * 4.2 Compound * 4.3 V-notch * 5 See also * 6 References * 7 Sources * 8 External links ETYMOLOGYThere is no single definition as to what constitutes a weir and one English dictionary simply defines a weir as a small dam , likely originating from Middle English were, Old English wer, derivative of root of werian, meaning "to defend, dam"
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Germany
Coordinates : 51°N 9°E / 51°N 9°E / 51; 9 Federal Republic
Republic
of Germany Bundesrepublik Deutschland (German ) Flag Coat of arms MOTTO: "Einigkeit und Recht und Freiheit " "Unity and Justice and Freedom" (de facto) ANTHEM: Deutschlandlied
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Hydroelectric Plant
HYDROELECTRICITY is electricity produced from hydropower . In 2015 hydropower generated 16.6% of the world's total electricity and 70% of all renewable electricity , and was expected to increase about 3.1% each year for the next 25 years. Hydropower
Hydropower
is produced in 150 countries, with the Asia-Pacific region generating 33 percent of global hydropower in 2013. China
China
is the largest hydroelectricity producer, with 920 TWh
TWh
of production in 2013, representing 16.9 percent of domestic electricity use. The cost of hydroelectricity is relatively low, making it a competitive source of renewable electricity. The hydro station consumes no water, unlike coal or gas plants. The average cost of electricity from a hydro station larger than 10 megawatts is 3 to 5 U.S. cents per kilowatt-hour
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Pumped-storage Hydroelectricity
PUMPED-STORAGE HYDROELECTRICITY (PSH), or PUMPED HYDROELECTRIC ENERGY STORAGE (PHES), is a type of hydroelectric energy storage used by electric power systems for load balancing . The method stores energy in the form of gravitational potential energy of water, pumped from a lower elevation reservoir to a higher elevation. Low-cost surplus off-peak electric power is typically used to run the pumps. During periods of high electrical demand, the stored water is released through turbines to produce electric power. Although the losses of the pumping process makes the plant a net consumer of energy overall, the system increases revenue by selling more electricity during periods of peak demand , when electricity prices are highest
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Special
SPECIAL or SPECIALS may refer to: CONTENTS * 1 Music * 2 Film and television * 3 Other uses * 4 See also MUSIC * Special (album) , a 1992 album by Vesta Williams * "Special" (Garbage song) , 1998 * "Special" (Mew song) , 2005 * "Special" (Stephen Lynch song) , 2000 * The Specials
The Specials
, a British band * "Special", a song by Violent Femmes on The Blind Leading the Naked * "Special", a song on
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Water Sport
CONTENTS * 1 In the water * 2 Under water * 2.1 Recreational diving
Recreational diving
* 2.2 Underwater sports * 3 See also * 4 References IN THE WATER * Scuba Diving
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North Rhine-Westphalia
NORTH RHINE-WESTPHALIA (German: Nordrhein-Westfalen, pronounced ( listen ), commonly shortened to NRW) is the most populous state of Germany
Germany
, with a population of approximately 18 million, and the fourth largest by area. Its capital is Düsseldorf ; the most populous city is Cologne
Cologne
. Four of Germany's ten largest cities— Cologne
Cologne
, Düsseldorf , Dortmund
Dortmund
, and Essen
Essen
—are located within the state, as well as the largest metropolitan area on the European continent, Rhine-Ruhr
Rhine-Ruhr
. North Rhine- Westphalia was formed in 1946 as a merger of the provinces of North Rhine
North Rhine
and Westphalia , both formerly parts of Prussia
Prussia
, and the Free State of Lippe
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Lenne
The LENNE RIVER is a tributary of the Ruhr River , and has caused flooding in recent years. Having its source on top of the Kahler Asten near Winterberg
Winterberg
in an intermittent spring at an elevation of 2,687 feet, the Lenne
Lenne
ends after a course of 128 km flowing into the Ruhr river near the city of Hagen
Hagen
. With an average discharge of 25 m³/s near its mouth, it is the main tributary of the Ruhr . REFERENCES * ^ Gôppert, H.; Ihringer, J.; Plate, E. J.; Morgenschweis, G. (April 1998). "Flood forecast model for improved reservoir management in the Lenne
Lenne
River catchment, Germany". Hydrological Sciences—Journal—des Sciences Hydrologiques. Pub. 43 (2): 215. CiteSeerX 10.1.1.408.1817  . doi :10.1080/02626669809492119
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Reservoir (water)
A RESERVOIR (from French réservoir – a "storehouse" ) is a storage space for fluids. These fluids may be water, hydrocarbons or gas. A reservoir usually means an enlarged NATURAL or ARTIFICIAL LAKE, STORAGE POND or IMPOUNDMENT created using a dam or lock to store water. Reservoirs can be created by controlling a stream that drains an existing body of water. They can also be constructed in river valleys using a dam. Alternately, a reservoir can be built by excavating flat ground or constructing retaining walls and levees . Tank reservoirs store liquids or gases in storage tanks that may be elevated, at grade level, or buried. Tank reservoirs for water are also called cisterns . Underground reservoirs are used to store liquids, principally either water or petroleum , below ground
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Geographic Coordinate System
A GEOGRAPHIC COORDINATE SYSTEM is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are often chosen such that one of the numbers represents a vertical position , and two or three of the numbers represent a horizontal position . A common choice of coordinates is latitude , longitude and elevation . To specify a location on a two-dimensional map requires a map projection
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Dortmund
DORTMUND ( ( listen ); Low German : Düörpm ; Latin : Tremonia) is an independent city in North Rhine-Westphalia , Germany
Germany
. It is in the middle part of the state and is considered to be the administrative, commercial and cultural centre of the eastern Ruhr
Ruhr
area . Its population of 581,612 (2015) makes it the 8th largest city in Germany. Moreover, Dortmund
Dortmund
is the largest city by area and population in the Ruhr
Ruhr
Area , an urban area with some 5.1 million (2011) inhabitants which is the largest urban agglomeration in Germany
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Klusenberg
The KLUSENBERG is, at 254.33 m above NHN, the highest elevation on the territory of the city of Dortmund
Dortmund
. The Klusenberg
Klusenberg
part of the Ardey Hills lies west of the Hohensyburg . To the south its slopes fall away into the Hengsteysee
Hengsteysee
lake. The Klusenberg
Klusenberg
is wooded with just a few residential houses. REFERENCES This article DOES NOT CITE ANY SOURCES . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2016) (Learn how and when to remove this template message ) This Dortmund
Dortmund
location article is a stub . You can help by expanding it
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Ruhr (river)
The RUHR is a river in western Germany
Germany
( North Rhine-Westphalia
North Rhine-Westphalia
), a right tributary (east-side) of the Rhine
Rhine
. DESCRIPTION AND HISTORY The Ruhr
Ruhr
valley near Bochum
Bochum
during a flood The source of the Ruhr
Ruhr
is near the town of Winterberg
Winterberg
in the mountainous Sauerland
Sauerland
region, at an elevation of approximately 2,200 feet (670 m). It flows into the lower Rhine
Rhine
at an elevation of only 56 feet (17 m) in the municipal area of Duisburg
Duisburg
. Its total length is 218 km (135 mi), its average discharge is 79 m³/s (cubic metres per second) at Mülheim near its mouth
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Ardey Hills
The ARDEY HILLS (German : Ardeygebirge or Ardey) are a range of wooded hills, up to 273.8 m above sea level (NN) , in the territory of the city of Dortmund
Dortmund
and the districts of Ennepe-Ruhr-Kreis and Unna in the German state of North Rhine-Westphalia
North Rhine-Westphalia
. The hills form part of the eastern Rhenish Massif
Rhenish Massif
and, to a lesser extent, to the Berg-Mark Hills (Bergisch-Märkisches Hügelland)
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Hagen
HAGEN (German pronunciation: ( listen )) is the 41st-largest city in Germany
Germany
. The municipality is located in the state of North Rhine- Westphalia
Westphalia
. It is located on the south eastern edge of the Ruhr area , 15 km south of Dortmund
Dortmund
, where the rivers Lenne and Volme (met by the river Ennepe ) meet the river Ruhr
Ruhr
. As of 31 December 2010, the population was 188,529. The city is home to the FernUniversität Hagen
Hagen
, which is the only state funded distance education university in Germany. Counting more than 67,000 students (March 2010), it is the largest university in Germany