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87-699: Roetgen is located approximately 16 km (10 mi) south-east of Aachen , near the border with Belgium . It is in the north of the High Fens-Eifel Nature Park on the Weser stream which rises a few kilometres to the south. Between Roetgen and Rott is the Dreilägerbach Reservoir , which is fed by the Dreilägerbach stream and the artificially Schleebachgraben and Hasselbachgraben ditches. The attached waterworks supplies large parts of Aachen and

174-540: A river mouth , or flows into another body of water , such as a lake or ocean . A basin is separated from adjacent basins by a perimeter, the drainage divide , made up of a succession of elevated features, such as ridges and hills . A basin may consist of smaller basins that merge at river confluences , forming a hierarchical pattern . Other terms for a drainage basin are catchment area , catchment basin , drainage area , river basin , water basin , and impluvium . In North America, they are commonly called

261-484: A sink , which may be a permanent lake, a dry lake , or a point where surface water is lost underground . Drainage basins are similar but not identical to hydrologic units , which are drainage areas delineated so as to nest into a multi-level hierarchical drainage system . Hydrologic units are defined to allow multiple inlets, outlets, or sinks. In a strict sense, all drainage basins are hydrologic units but not all hydrologic units are drainage basins. About 48.71% of

348-414: A watershed , though in other English-speaking places, "watershed" is used only in its original sense, that of the drainage divide line. A drainage basin's boundaries are determined by watershed delineation , a common task in environmental engineering and science. In a closed drainage basin, or endorheic basin , rather than flowing to the ocean, water converges toward the interior of the basin, known as

435-449: A drainage basin, and there are different ways to interpret that data. In the unlikely event that the gauges are many and evenly distributed over an area of uniform precipitation, using the arithmetic mean method will give good results. In the Thiessen polygon method, the drainage basin is divided into polygons with the rain gauge in the middle of each polygon assumed to be representative for

522-540: A drainage boundary is referred to as watershed delineation . Finding the area and extent of a drainage basin is an important step in many areas of science and engineering. Most of the water that discharges from the basin outlet originated as precipitation falling on the basin. A portion of the water that enters the groundwater system beneath the drainage basin may flow towards the outlet of another drainage basin because groundwater flow directions do not always match those of their overlying drainage network. Measurement of

609-589: A result of the Variscan orogeny . After this event, and over the course of the following 200 million years, this area has been continuously flattened. During the Cretaceous period, the ocean penetrated the continent from the direction of the North Sea up to the mountainous area near Aachen, bringing with it clay, sand, and chalk deposits. While the clay (which was the basis for a major pottery industry in nearby Raeren )

696-690: Is divided into seven administrative districts, or boroughs, each with its own district council, district leader, and district authority. The councils are elected locally by those who live within the district, and these districts are further subdivided into smaller sections for statistical purposes, with each sub-district named by a two-digit number. The districts of Aachen, including their constituent statistical districts, are: Regardless of official statistical designations, there are 50 neighbourhoods and communities within Aachen, here arranged by district: The following cities and communities border Aachen, clockwise from

783-553: Is mostly found in the lower areas of Aachen, the hills of the Aachen Forest and the Lousberg were formed from upper Cretaceous sand and chalk deposits. More recent sedimentation is mainly located in the north and east of Aachen and was formed through tertiary and quaternary river and wind activities. Along the major thrust fault of the Variscan orogeny , there are over 30 thermal springs in Aachen and Burtscheid . Additionally,

870-480: Is referred to as " watershed management ". In Brazil , the National Policy of Water Resources, regulated by Act n° 9.433 of 1997, establishes the drainage basin as the territorial division of Brazilian water management. When a river basin crosses at least one political border, either a border within a nation or an international boundary, it is identified as a transboundary river . Management of such basins becomes

957-904: Is the 13th-largest city in North Rhine-Westphalia and the 27th-largest city of Germany, with around 261,000 inhabitants. Aachen is located at the northern foothills of the High Fens and the Eifel Mountains. It sits on the Wurm River , a tributary of the Rur , and together with Mönchengladbach , it is the only larger German city in the drainage basin of the Meuse . It is the westernmost larger city in Germany, lying approximately 61 km (38 mi) west of Cologne and Bonn , directly bordering Belgium in

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1044-600: Is the Dead Sea . Drainage basins have been historically important for determining territorial boundaries, particularly in regions where trade by water has been important. For example, the English crown gave the Hudson's Bay Company a monopoly on the fur trade in the entire Hudson Bay basin, an area called Rupert's Land . Bioregional political organization today includes agreements of states (e.g., international treaties and, within

1131-682: The African Great Lakes , the interiors of Australia and the Arabian Peninsula , and parts in Mexico and the Andes . Some of these, such as the Great Basin, are not single drainage basins but collections of separate, adjacent closed basins. In endorheic bodies of water where evaporation is the primary means of water loss, the water is typically more saline than the oceans. An extreme example of this

1218-792: The Continental Divide , northern Alaska and parts of North Dakota , South Dakota , Minnesota , and Montana in the United States, the north shore of the Scandinavian peninsula in Europe, central and northern Russia, and parts of Kazakhstan and Mongolia in Asia , which totals to about 17% of the world's land. Just over 13% of the land in the world drains to the Pacific Ocean . Its basin includes much of China, eastern and southeastern Russia, Japan,

1305-501: The Eifel and the High Fens and its subsequent prevailing westerly weather patterns, rainfall in Aachen (on average 805 mm/year) is comparatively higher than, for example, in Bonn (with 669 mm/year). Another factor in the local weather forces of Aachen is the occurrence of Foehn winds on the southerly air currents, which results from the city's geographic location on the northern edge of

1392-681: The Korean Peninsula , most of Indochina, Indonesia and Malaysia, the Philippines, all of the Pacific Islands , the northeast coast of Australia , and Canada and the United States west of the Continental Divide (including most of Alaska), as well as western Central America and South America west of the Andes. The Indian Ocean 's drainage basin also comprises about 13% of Earth's land. It drains

1479-589: The Meuse , and about 30 km (19 mi) north of the High Fens , which form the northern edge of the Eifel uplands of the Rhenish Massif . The maximum dimensions of the city's territory are 21.6 km ( 13 + 3 ⁄ 8  mi) from north to south, and 17.2 km ( 10 + 3 ⁄ 4  mi) from east to west. The city limits are 87.7 km ( 54 + 1 ⁄ 2  mi) long, of which 23.8 km ( 14 + 3 ⁄ 4  mi) border Belgium and 21.8 km ( 13 + 1 ⁄ 2  mi)

1566-713: The Neolithic era, about 5,000 years ago, attracted to its warm mineral springs . Latin Aquae figures in Aachen's Roman name Aquae granni , which meant "waters of Grannus ", referring to the Celtic god of healing who was worshipped at the springs. This word became Åxhe in Walloon and Aix in French, and subsequently Aix-la-Chapelle to distinguish it from Aix-en-Provence , after Charlemagne had his palatine chapel built there in

1653-501: The Palace . Charlemagne spent most winters in Aachen between 792 and his death in 814. Aachen became the focus of his court and the political centre of his empire. During the Carolingian empire, a Jewish community lived near the royal palace. In Jewish texts, the city of Aachen was called Aish or Ash (אש). In 797, Isaac, a Jewish merchant, accompanied two ambassadors of Charlemagne to

1740-602: The RWTH Aachen (Rheinisch-Westfälische Technische Hochschule), known especially for mechanical engineering, automotive and manufacturing technology as well as for its research and academic hospital Klinikum Aachen , one of the largest medical facilities in Europe. Aachen is located in the middle of the Meuse–Rhine Euroregion , close to the border tripoint of Germany, the Netherlands, and Belgium . The town of Vaals in

1827-611: The Treaty of Verdun , the city was within the borders of Middle Francia , until it became part of East Francia after the Treaty of Meerssen (870). It subsequently was part of the Holy Roman Empire and was granted city rights in 1166 by Emperor Frederick Barbarossa , becoming an imperial city . It served as the coronation site where 31 Holy Roman Emperors were crowned Kings of the Germans from 936 to 1531, until Frankfurt am Main became

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1914-666: The War of Devolution . The second congress ended with the second treaty in 1748, ending the War of the Austrian Succession . In 1789, there was a constitutional crisis in the Aachen government, and in 1794 Aachen lost its status as a free imperial city . In 1629, the Aachen Jewish community was expelled from the city. In 1667, six Jews were allowed to return. Most of the Aachen Jewish community settled in Burtscheid. As recently as

2001-570: The migration period . The last Roman coin finds are from the time of Emperor Gratian (AD 375–383). Rome withdrew its troops from the area, but the town remained populated. By 470, the town came to be ruled by the Ripuarian Franks and subordinated to their capital, Cologne . During the Roman period, Aachen was the site of a flourishing Jewish community. Pepin the Short had a castle residence built in

2088-552: The vicus Aquae Granni was Frankized around the 5th century. This was followed by a period of sedentism under first Merovingian and then Carolingian rule. With the completion of the Carolingian Palace of Aachen at the transition to the 9th century, Aachen was constituted as the main royal residence of the Frankish Empire ruled by Charlemagne . Because of that the city is sometimes called "cradle of Europe". After

2175-764: The " chef-lieu du département de la Roer " in Napoleon's First French Empire . In 1815, after the Napoleonic Wars , the Kingdom of Prussia took over within the new German Confederation . The city was one of its most socially and politically backward centres until the end of the 19th century. Administered within the Rhine Province , by 1880 the population was 80,000. Starting in 1838, the railway from Cologne to Belgium passed through Aachen. The city suffered extreme overcrowding and deplorable sanitary conditions until 1875, when

2262-515: The Canadian city of Regina, Saskatchewan which is located at a similar latitude but at the heart of the North American landmass, far away from the sea's moderating effects, is classified as being in zone 3a. In the 1991–2020 period, the last freeze (at 2 m above ground) of spring occcured on April 28th and the first fall freeze on October 13th, on average. The Aachen weather station has recorded

2349-589: The Celtic god, and it seems it was the Roman 6th Legion at the start of the 1st century AD that first channelled the hot springs into a spa at Büchel, adding at the end of the same century the Münstertherme spa, two water pipelines, and a probable sanctuary dedicated to Grannus. A kind of forum, surrounded by colonnades, connected the two spa complexes. There was an extensive residential area. The Romans built bathhouses near Burtscheid . A temple precinct called Vernenum

2436-527: The Dutch town of Kerkrade with drinking water . The parish of Roetgen includes the villages of Roetgen, Rott and Mulartshütte , which is the oldest part of Roetgen. To the northwest is the borough of Aachen with its quarters of Kornelimünster and Walheim , to the northeast is the town of Stolberg with its quarters of Venwegen and Zweifall , to the southeast is the Simmerath parish of Lammersdorf . To

2523-450: The Eifel. Because the city is surrounded by hills, it suffers from inversion-related smog. Some areas of the city have become urban heat islands as a result of poor heat exchange, both because of the area's natural geography and from human activity. The city's numerous cold air corridors, which are slated to remain as free as possible from new construction, therefore play an important role in

2610-519: The Netherlands lies nearby at about 6 km (4 mi) from Aachen's city centre, while the Dutch city of Heerlen and Eupen , the capital of the German-speaking Community of Belgium , are both located about 20 km (12 mi) from Aachen city centre. Aachen lies near the head of the open valley of the Wurm (which today flows through the city in canalised form), part of the larger basin of

2697-553: The Netherlands. The highest point in Aachen, located in the far southeast of the city, lies at an elevation of 410 m (1,350 ft) above sea level. The lowest point, in the north, and on the border with the Netherlands, is at 125 m (410 ft). As the westernmost city in Germany (and close to the Low Countries), Aachen and the surrounding area belongs to a temperate climate zone ( Cfb ), with humid weather, mild winters, and warm summers. Because of its location north of

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2784-639: The Roman Curia as such. In 936, Otto I was crowned king of East Francia in the collegiate church built by Charlemagne. During the reign of Otto II , the nobles revolted and the West Franks under Lothair raided Aachen in 978. Aachen was attacked again by Odo of Champagne , who attacked the imperial palace while Conrad II was absent. Odo relinquished it and was killed afterwards. The palace and town of Aachen had fortifying walls built by order of Emperor Frederick Barbarossa between 1172 and 1176. Over

2871-598: The US, interstate compacts ) or other political entities in a particular drainage basin to manage the body or bodies of water into which it drains. Examples of such interstate compacts are the Great Lakes Commission and the Tahoe Regional Planning Agency . In hydrology , the drainage basin is a logical unit of focus for studying the movement of water within the hydrological cycle . The process of finding

2958-406: The basin, it can form tributaries that change the structure of the land. There are three different main types, which are affected by the rocks and ground underneath. Rock that is quick to erode forms dendritic patterns, and these are seen most often. The two other types of patterns that form are trellis patterns and rectangular patterns. Rain gauge data is used to measure total precipitation over

3045-458: The city is best known is Aachener Printen , a type of gingerbread . The name Aachen is a modern descendant, like southern German Ach(e) , German: Aach , meaning "river" or "stream", from Old High German ahha , meaning "water" or "stream", which directly translates (and etymologically corresponds) to Latin Aquae , referring to the springs. The location has been inhabited by humans since

3132-449: The city. On Kristallnacht in 1938, the synagogue was destroyed. By the onset of World War II in 1939, many Jews had emigrated or were arrested, and only 782 remained in the city. At the end of the war in 1945, only 62 Jews lived in the city. As of 2003, 1,434 Jews were again living in Aachen. The city of Aachen has developed into a technology hub as a by-product of hosting one of the leading universities of technology in Germany with

3219-415: The city. The first killed 1,525, including 212 children, and bombed six hospitals. During the second, 442 aircraft hit two railway stations, killed 207, and left 15,000 homeless. The raids destroyed Aachen-Eilendorf and Aachen-Burtscheid . The city and its fortified surroundings were besieged from 12 September to 21 October 1944 by the US 1st Infantry Division with the 3rd Armored Division assisting from

3306-527: The court library were also produced locally. During the reign of Louis the Pious (814–840), substantial quantities of ancient texts were produced at Aachen, including legal manuscripts such as the leges scriptorium group, patristic texts including the five manuscripts of the Bamberg Pliny Group . Finally, under Lothair I (840–855), texts of outstanding quality were still being produced. This however marked

3393-534: The court of Harun al-Rashid . He returned to Aachen in July 802, bearing an elephant called Abul-Abbas as a gift for the emperor. After Charlemagne's death, he was buried in the church which he had built; his original tomb has been lost, while his alleged remains are preserved in the Karlsschrein , the shrine where he was reburied after being declared a saint; his saintliness, however, was never officially acknowledged by

3480-430: The discharge of water from a basin may be made by a stream gauge located at the basin's outlet. Depending on the conditions of the drainage basin, as rainfall occurs some of it seeps directly into the ground. This water will either remain underground, slowly making its way downhill and eventually reaching the basin, or it will permeate deeper into the soil and consolidate into groundwater aquifers. As water flows through

3567-441: The drainage area is dependent on the soil type. Certain soil types such as sandy soils are very free-draining, and rainfall on sandy soil is likely to be absorbed by the ground. However, soils containing clay can be almost impermeable and therefore rainfall on clay soils will run off and contribute to flood volumes. After prolonged rainfall even free-draining soils can become saturated , meaning that any further rainfall will reach

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3654-692: The drainage basin to the mouth, and may accumulate there, disturbing the natural mineral balance. This can cause eutrophication where plant growth is accelerated by the additional material. Because drainage basins are coherent entities in a hydrological sense, it has become common to manage water resources on the basis of individual basins. In the U.S. state of Minnesota , governmental entities that perform this function are called " watershed districts ". In New Zealand, they are called catchment boards. Comparable community groups based in Ontario, Canada, are called conservation authorities . In North America, this function

3741-821: The eastern coast of Africa, the coasts of the Red Sea and the Persian Gulf , the Indian subcontinent , Burma, and most parts of Australia . The five largest river basins (by area), from largest to smallest, are those of the Amazon (7 million km ), the Congo (4 million km ), the Nile (3.4 million km ), the Mississippi (3.22 million km ), and the Río de la Plata (3.17 million km ). The three rivers that drain

3828-600: The end of 2009, the foreign-born residents of Aachen made up 13.6 percent of the total population. A significant portion of foreign residents are students at the RWTH Aachen University . Aachen is at the western end of the Benrath line that divides High German to the south from the rest of the West Germanic speech area to the north. Aachen's local dialect is called Öcher Platt and belongs to Ripuarian . The city

3915-455: The end of the period of manuscript production at Aachen. In 1598, following the invasion of Spanish troops from the Netherlands , Rudolf deposed all Protestant office holders in Aachen and went as far as expelling them from the city. From the early 16th century, Aachen started to lose its power and influence. First the coronations of emperors were moved from Aachen to Frankfurt . This

4002-466: The following extreme values: The geology of Aachen is very structurally heterogeneous. The oldest occurring rocks in the area surrounding the city originate from the Devonian period and include carboniferous sandstone , greywacke , claystone and limestone . These formations are part of the Rhenish Massif , north of the High Fens. In the Pennsylvanian subperiod of the Carboniferous geological period, these rock layers were narrowed and folded as

4089-412: The greatest portion of western Sub-Saharan Africa , as well as Western Sahara and part of Morocco . The two major mediterranean seas of the world also flow to the Atlantic. The Caribbean Sea and Gulf of Mexico basin includes most of the U.S. interior between the Appalachian and Rocky Mountains , a small part of the Canadian provinces of Alberta and Saskatchewan , eastern Central America ,

4176-435: The ground and along rivers it can pick up nutrients , sediment , and pollutants . With the water, they are transported towards the outlet of the basin, and can affect the ecological processes along the way as well as in the receiving water body . Modern use of artificial fertilizers , containing nitrogen (as nitrates ), phosphorus , and potassium , has affected the mouths of drainage basins. The minerals are carried by

4263-422: The ground at its terminus, the area can go by several names, such playa, salt flat, dry lake , or alkali sink . The largest endorheic basins are in Central Asia , including the Caspian Sea , the Aral Sea , and numerous smaller lakes. Other endorheic regions include the Great Basin in the United States, much of the Sahara Desert , the drainage basin of the Okavango River ( Kalahari Basin ), highlands near

4350-417: The islands of the Caribbean and the Gulf, and a small part of northern South America. The Mediterranean Sea basin, with the Black Sea , includes much of North Africa , east-central Africa (through the Nile River ), Southern , Central, and Eastern Europe , Turkey , and the coastal areas of Israel , Lebanon , and Syria . The Arctic Ocean drains most of Western Canada and Northern Canada east of

4437-448: The late 18th century the Abbess of Burtscheid was still prevented from building a road linking her territory to the neighbouring estates of the duke of Jülich ; the city of Aachen deployed its handful of soldiers to chase away road-diggers. On 9 February 1801, the Peace of Lunéville removed the ownership of Aachen and the entire "left bank" of the Rhine from Germany (the Holy Roman Empire ) and granted it to France. In 1815, control of

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4524-402: The late 8th century and then made the city his empire's capital. The city is known by a variety of different names in other languages: Flint quarries on the Lousberg , Schneeberg, and Königshügel, first used during Neolithic times (3000–2500 BC), attest to the long occupation of the site of Aachen, as do recent finds under the modern city's Elisengarten pointing to a former settlement from

4611-475: The medieval fortifications were abandoned as a limit to building and new, better housing was built in the east of the city, where sanitary drainage was easiest. In December 1880, the Aachen tramway network was opened, and in 1895 it was electrified. In the 19th century and up to the 1930s, the city was important in the production of railway locomotives and carriages, iron, pins, needles , buttons, tobacco, woollen goods, and silk goods. After World War I , Aachen

4698-427: The middle of the 17th century, the city had developed a considerable reputation as a spa, although this was in part because Aachen was then – and remained well into the 19th and early 20th century – a place of high-level prostitution. Traces of this hidden agenda of the city's history are found in the 18th-century guidebooks to Aachen as well as to the other spas. The main indication for visiting patients, ironically,

4785-409: The most water, from most to least, are the Amazon, Ganges , and Congo rivers. Endorheic basin are inland basins that do not drain to an ocean. Endorheic basins cover around 18% of the Earth's land. Some endorheic basins drain to an Endorheic lake or Inland sea . Many of these lakes are ephemeral or vary dramatically in size depending on climate and inflow. If water evaporates or infiltrates into

4872-470: The next 500 years, most kings of Germany who ruled the Holy Roman Empire were crowned in Aachen. The original audience hall built by Charlemagne was torn down and replaced by the current city hall in 1330. During the 13th century, many Jews converted to Christianity, as shown in the records of the Aachen Minster (today's Cathedral). In 1486, the Jews of Aachen offered gifts to Maximilian I during his coronation ceremony. The last king to be crowned here

4959-467: The northwest: Herzogenrath , Würselen , Eschweiler , Stolberg and Roetgen (which are all in the district of Aachen ); Raeren , Kelmis and Plombières ( Liège Province in Belgium) as well as Vaals , Gulpen-Wittem , Simpelveld , Heerlen and Kerkrade (all in Limburg Province in the Netherlands). The current mayor of Aachen is Sibylle Keupen , an independent endorsed by Alliance 90/The Greens , since 2020. The most recent mayoral election

5046-403: The preferred place of coronation. One of Germany's leading institutes of higher education in technology, the RWTH Aachen University ( Rheinisch-Westfälisch Technische Hochschule Aachen ), is located in the city. Its university hospital Uniklinikum Aachen is Europe's largest single-building hospital. Aachen's industries include science, engineering and information technology. In 2009, Aachen

5133-418: The rainfall on the area of land included in its polygon. These polygons are made by drawing lines between gauges, then making perpendicular bisectors of those lines form the polygons. The isohyetal method involves contours of equal precipitation are drawn over the gauges on a map. Calculating the area between these curves and adding up the volume of water is time-consuming. Isochrone maps can be used to show

5220-572: The responsibility of the countries sharing it. Nile Basin Initiative , OMVS for Senegal River , Mekong River Commission are a few examples of arrangements involving management of shared river basins. Management of shared drainage basins is also seen as a way to build lasting peaceful relationships among countries. The catchment is the most significant factor determining the amount or likelihood of flooding . Catchment factors are: topography , shape, size, soil type, and land use (paved or roofed areas). Catchment topography and shape determine

5307-461: The river rather than being absorbed by the ground. If the surface is impermeable the precipitation will create surface run-off which will lead to higher risk of flooding; if the ground is permeable, the precipitation will infiltrate the soil. Land use can contribute to the volume of water reaching the river, in a similar way to clay soils. For example, rainfall on roofs, pavements , and roads will be collected by rivers with almost no absorption into

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5394-402: The royal household for several months. In the year of his coronation as king of the Franks , 768, Charlemagne came to spend Christmas at Aachen for the first time. He remained there in a mansion which he may have extended, although there is no source attesting to any significant building activity at Aachen in his time, apart from the building of the Palatine Chapel (since 1930, cathedral) and

5481-495: The same period. Bronze Age (around 1600 BC) settlement is evidenced by the remains of barrows (burial mounds) found, for example, on the Klausberg. During the Iron Age , the area was settled by Celtic peoples who were perhaps drawn by the marshy Aachen basin's hot sulphur springs where they worshipped Grannus , god of light and healing. The 25-hectare Roman spa resort town of Aquae Granni was, according to legend, founded by Grenus, under Hadrian , around 124 AD. Grenus refers to

5568-419: The south. Around 13 October the US 2nd Armored Division, coming from the north, and got as close as Würselen , while the 30th Infantry Division completed the encirclement of Aachen on 16 October 1944. With reinforcements from the US 28th Infantry Division the battle continued involving direct assaults through the heavily defended city, which forced the German garrison to surrender on 21 October 1944. Aachen

5655-403: The southwest, and the Netherlands in the northwest. The city lies in the Meuse–Rhine Euroregion and is the seat of the district of Aachen ( Städteregion Aachen ). The once Celtic settlement was equipped with several thermae in the course of colonization by Roman pioneers settling at the warm Aachen thermal springs around the 1st century. After the withdrawal of the Roman troops,

5742-418: The speed with which the runoff reaches a river. A long thin catchment will take longer to drain than a circular catchment. Size will help determine the amount of water reaching the river, as the larger the catchment the greater the potential for flooding. It is also determined on the basis of length and width of the drainage basin. Soil type will help determine how much water reaches the river. The runoff from

5829-435: The subsurface of Aachen is traversed by numerous active faults that belong to the Rurgraben fault system, which has been responsible for numerous earthquakes in the past, including the 1756 Düren earthquake and the 1992 Roermond earthquake , which was the strongest earthquake ever recorded in the Netherlands . Aachen has 245,885 inhabitants (as of 31 December 2015), of whom 118,272 are female, and 127,613 are male. At

5916-415: The time taken for rain to reach the river, while catchment size, soil type, and development determine the amount of water to reach the river. Generally, topography plays a big part in how fast runoff will reach a river. Rain that falls in steep mountainous areas will reach the primary river in the drainage basin faster than flat or lightly sloping areas (e.g., > 1% gradient). Shape will contribute to

6003-477: The time taken for runoff water within a drainage basin to reach a lake, reservoir or outlet, assuming constant and uniform effective rainfall. Drainage basins are the principal hydrologic unit considered in fluvial geomorphology . A drainage basin is the source for water and sediment that moves from higher elevation through the river system to lower elevations as they reshape the channel forms. Drainage basins are important in ecology . As water flows over

6090-405: The tornado. Roetgen consists of three districts: Mulartshütte is the oldest settlement of the three. Aachen Aachen ( / ˈ ɑː k ən / AH -kən , German: [ˈaːxn̩] ; Aachen dialect : Oche [ˈɔːxə] ; Dutch : Aken [ˈaːkə(n)] ; French: Aix-la-Chapelle ; Latin: Aquae Granni or Aquisgranum )

6177-506: The town on 12 September 1944 at 14:30 hours. The city was the location of the court martial of US Army Private Eddie Slovik in November 1944, notable because of all US military personnel in World War II accused of desertion , Slovik was the only one sentenced to death and actually executed . On March 13, 2019, Roetgen was hit by a low-end F3 tornado . The tornado caused moderate to severe damage to buildings and trees. Vehicles were also overturned and flipped. 5 people were injured by

6264-489: The town was passed to the Kingdom of Prussia through an agreement reached by the Congress of Vienna . The third congress took place in 1818, to decide the fate of occupied Napoleonic France. By the middle of the 19th century, industrialisation had swept away most of the city's medieval rules of production and commerce, although the remains of the city's medieval constitution were kept in place until 1801, when Aachen became

6351-607: The town, due to the proximity of the hot springs and also for strategic reasons as it is located between the Rhineland and northern France. Einhard mentions that in 765–766 Pepin spent both Christmas and Easter at Aquis villa ( Et celebravit natalem Domini in Aquis villa et pascha similiter ) ("and [he] celebrated the birth of the Lord [Christmas] in the town Aquis, and similarly Easter"), which must have been sufficiently equipped to support

6438-434: The urban climate of Aachen. The January average is 3.0 °C (37 °F), while the July average is 18.5 °C (65 °F). Precipitation is almost evenly spread throughout the year. The city's oceanic climate provides comparably mild winters: While Aachen falls within the coldest extents covered by USDA plant hardiness zone 8b in the 1991–2020 period, having an average yearly minimum of -9.22 °C (15.4 °F),

6525-496: The west, on the far side of the German-Belgian border lies the town of Eupen and the municipalities of Raeren , whose parish of Petergensfeld borders immediately on Roetgen north of Charliers Mill. Roetgen is attractive for commuters as it is already part of the Eifel and yet is still close in proximity to Aachen. In World War II, Roetgen was the first German town to fall under American control. American forces arrived in

6612-692: The world's land drains to the Atlantic Ocean . In North America , surface water drains to the Atlantic via the Saint Lawrence River and Great Lakes basins, the Eastern Seaboard of the United States, the Canadian Maritimes , and most of Newfoundland and Labrador . Nearly all of South America east of the Andes also drains to the Atlantic, as does most of Western and Central Europe and

6699-470: Was Ferdinand I in 1531. During the Middle Ages , Aachen remained a city of regional importance, due to its proximity to Flanders ; it achieved a modest position in the trade in woollen cloths, favoured by imperial privilege. The city remained a free imperial city , subject to the emperor only, but was politically far too weak to influence the policies of any of its neighbours. The only dominion it had

6786-557: Was syphilis ; only by the end of the 19th century had rheumatism become the most important object of cures at Aachen and Burtscheid. Aachen was chosen as the site of several important congresses and peace treaties: the first congress of Aachen (often referred to as the Congress of Aix-la-Chapelle in English) on 2 May 1668, leading to the First Treaty of Aachen in the same year which ended

6873-565: Was also the site of many important church councils, including the Council of 837 and the Council of 1166 , a council convened by the antipope Paschal III . Aachen was an important site for the production of historical manuscripts. Under Charlemagne's purview, both the Ada Gospels and the Coronation Gospels may have been produced in Aachen. In addition, quantities of the other texts in

6960-456: Was built near the modern Kornelimünster/Walheim . Today, remains have been found of three bathhouses, including two fountains in the Elisenbrunnen and the Burtscheid bathhouse. Roman civil administration in Aachen eventually broke down as the baths and other public buildings (along with most of the villae rusticae of the surrounding countryside) were destroyed around AD 375 at the start of

7047-473: Was followed by the religious wars and the great fire of 1656. After the destruction of most of the city in 1656, the rebuilding was mostly in the Baroque style. The decline of Aachen culminated in 1794, when the French, led by General Charles Dumouriez , occupied Aachen. In 1542, the Dutch humanist and physician Francis Fabricius published his study of the health benefits of the hot springs in Aachen. By

7134-403: Was held on 13 September 2020, with a runoff held on 27 September, and the results were as follows: The Aachen city council governs the city alongside the mayor. The most recent city council election was held on 13 September 2020, and the results were as follows: Drainage basin A drainage basin is an area of land in which all flowing surface water converges to a single point, such as

7221-622: Was largely unscathed. 4,000 inhabitants remained in the city; the rest had followed evacuation orders. Its first Allied-appointed mayor, Franz Oppenhoff , was assassinated by an SS commando unit. On 16 May 1815, the Jewish community of the city offered an homage in its synagogue to the Prussian king, Friedrich Wilhelm III . In 1862, a large synagogue was built, later called the Old Synagogue  [ de ; fr ; id ] . By 1933, 1,345 Jews lived in

7308-774: Was occupied by the Allies until 1930, along with the rest of German territory west of the Rhine. Aachen was one of the locations involved in the Rhenish Republic . On 21 October 1923, an armed mob took over the city hall. Similar actions took place in Mönchengladbach , Duisburg , and Krefeld . This republic lasted about a year. Aachen was heavily damaged during World War II . According to Jörg Friedrich in The Fire (2008), two Allied air raids on 11 April and 24 May 1944 "radically destroyed"

7395-525: Was over Burtscheid , a neighbouring territory ruled by a Benedictine abbess , which was forced to accept that all of its traffic must pass through the "Aachener Reich". As an imperial city, Aachen held certain political privileges that allowed it to remain independent of the troubles of Europe for many years. It remained a direct vassal of the Holy Roman Empire throughout most of the Middle Ages. It

7482-400: Was ranked eighth among cities in Germany for innovation. The regional dialect spoken in the city is a Central Franconian , Ripuarian variant with strong Limburgish influences from the dialects in the neighbouring Netherlands. As a Rhenish city, Aachen is one of the main centres of carnival celebrations in Germany , along with Cologne and Mainz . The culinary specialty for which

7569-563: Was the first German city to be captured by the Western Allies, and its residents welcomed the soldiers as liberators. What remained of the city was destroyed—in some areas completely—during the fighting, mostly by American artillery fire and demolitions carried out by the Waffen-SS defenders. Damaged buildings included medieval churches of and the Rathaus (city hall), although Aachen Cathedral

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