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Eifel Aqueduct
The Eifel Aqueduct was one of the longest aqueducts of the Roman Empire. The aqueduct, constructed in AD 80, carried water some from the hilly Eifel region of what is now Germany to the ancient city of Colonia Claudia Ara Agrippinensium (present-day Cologne). If the auxiliary spurs to additional springs are included, the length was . The construction was almost entirely below ground, and the flow of the water was produced entirely by gravity. A few bridges, including one up to in length, were needed to pass over valleys. Unlike some of the other famous Roman aqueducts, the Eifel aqueduct was specifically designed to minimize the above-ground portion to protect it from damage and freezing. History Before the building of the Eifel Aqueduct, Cologne got its water from the Vorgebirge aqueduct, which had its source in the springs and streams from the Ville region to the west of the city. As the city grew, this aqueduct was no longer able to provide enough water of sufficient qual ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meuse
The Meuse or Maas is a major European river, rising in France and flowing through Belgium and the Netherlands before draining into the North Sea from the Rhine–Meuse–Scheldt delta. It has a total length of . History From 1301, the upper Meuse roughly marked the western border of the Holy Roman Empire with the France in the Middle Ages, Kingdom of France, after Count Henry III, Count of Bar, Henry III of Bar had to receive the western part of the County of Bar (''Barrois mouvant'') as a French fief from the hands of King Philip IV of France, Philip IV. In 1408, a Burgundian army led by John the Fearless went to the aid of John III, Duke of Bavaria, John III against the citizens of Liège, who were in open revolt. After the Battle of Othée, battle, which saw the men from Liège defeated, John ordered the drowning in the Meuse of burghers and noblemen in Liège whose loyalties he suspected. The border remained relatively stable until the annexation of the Three Bishoprics ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plaster
Plaster is a building material used for the protective or decorative coating of walls and ceilings and for moulding and casting decorative elements. In English, "plaster" usually means a material used for the interiors of buildings, while "render" commonly refers to external applications. The term stucco refers to plasterwork that is worked in some way to produce relief decoration, rather than flat surfaces. The most common types of plaster mainly contain either gypsum, lime, or cement,Franz Wirsching "Calcium Sulfate" in Ullmann's Encyclopedia of Industrial Chemistry, 2012 Wiley-VCH, Weinheim. but all work in a similar way. The plaster is manufactured as a dry powder and is mixed with water to form a stiff but workable paste immediately before it is applied to the surface. The reaction with water liberates heat through crystallization and the hydrated plaster then hardens. Plaster can be relatively easily worked with metal tools and sandpaper and can be moulded, either on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arch
An arch is a curved vertical structure spanning an open space underneath it. Arches may support the load above them, or they may perform a purely decorative role. As a decorative element, the arch dates back to the 4th millennium BC, but structural load-bearing arches became popular only after their adoption by the Ancient Romans in the 4th century BC. Arch-like structures can be horizontal, like an arch dam that withstands the horizontal hydrostatic pressure load. Arches are usually used as supports for many types of vaults, with the barrel vault in particular being a continuous arch. Extensive use of arches and vaults characterizes an arcuated construction, as opposed to the trabeated system, where, like in the architectures of ancient Greece, China, and Japan (as well as the modern steel-framed technique), posts and beams dominate. Arches had several advantages over the lintel, especially in the masonry construction: with the same amount of material it can have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mortar (masonry)
Mortar is a workable paste which hardens to bind building blocks such as stones, bricks, and concrete masonry units, to fill and seal the irregular gaps between them, spread the weight of them evenly, and sometimes to add decorative colours or patterns to masonry walls. In its broadest sense, mortar includes pitch, asphalt, and soft clay, as those used between bricks, as well as cement mortar. The word "mortar" comes from the Old French word ''mortier'', "builder's mortar, plaster; bowl for mixing." (13c.). Cement mortar becomes hard when it cures, resulting in a rigid aggregate (composite) , aggregate structure; however, the mortar functions as a weaker component than the building blocks and serves as the sacrificial element in the masonry, because mortar is easier and less expensive to repair than the building blocks. Bricklayers typically make mortars using a mixture of sand, a binder, and water. The most common binder since the early 20th century is Portland cement, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hürth
Hürth () is a town in the Rhein-Erft-Kreis, North Rhine-Westphalia, Germany. Hürth shares borders with the city of Cologne and is about 6 km to the southwest of Cologne city centre, at the northeastern slope of the natural preserve Naturpark Kottenforst-Ville, Kottenforst-Ville. The town consists of thirteen districts, once independent villages, and is distributed over a relatively large area. The municipal area is interspersed with lakes and stretches of forest. In former times, the Eifel Aqueduct, a Roman aqueduct which supplied the city of Cologne with drinking water, went through Hürth. Remnants of various aqueducts can still be found underground. It is also famous as the birthplace of Michael Schumacher, Michael and Ralf Schumacher. Geography Hürth is situated about 6 km to the southwest of Cologne city centre, at the northeastern slope of the Naturpark Kottenforst-Ville, Kottenforst-Ville nature reserve. The town, consisting of thirteen formerly independent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bonn
Bonn () is a federal city in the German state of North Rhine-Westphalia, located on the banks of the Rhine. With a population exceeding 300,000, it lies about south-southeast of Cologne, in the southernmost part of the Rhine-Ruhr region. This metropolitan area, Germany's largest, is also the second largest in the European Union by GDP, with over 11 million residents. Bonn served as the capital of West Germany from 1949 until 1990 and was the seat of government for reunified Germany until 1999, when the government relocated to Berlin. The city holds historical significance as the birthplace of Germany's current constitution, the Basic Law. Founded in the 1st century BC as a settlement of the Ubii and later part of the Roman province Germania Inferior, Bonn is among Germany's oldest cities. It was the capital city of the Electorate of Cologne from 1597 to 1794 and served as the residence of the Archbishops and Prince-electors of Cologne. The period during which Bonn was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naturpark Kottenforst-Ville
Rheinland Nature Park (''Naturpark Rheinland'') is a nature park in North Rhine-Westphalia, situated between Bergheim, North Rhine-Westphalia, Bergheim, Kerpen, Erftstadt, Euskirchen, Königswinter, Bornheim (Rheinland), Bornheim, Bonn, Brühl, North Rhine-Westphalia, Brühl, Hürth, Frechen and Pulheim. It covers an area of about 880 km2. Ville-Seen-Platte Roughly translated, this would be the 'plateau of lakes in the Ville'. In the vicinity of Erftstadt, Brühl and Hürth many small and large lakes have been created due to coal open-pit mining, mining. The reforestation of the area was begun in 1920 by planting beech, pine, oak and larch trees. Today, there are about forty lakes that have sprung from the mining operations. List of lakes on the ''Villen-Seen-Platte'': * Concordia See * Köttinger See * Zieselsmaarsee * Villesee * Dinnendahlsee * Liblarer See * Forellenteich * Obersee * Mittelsee * Untersee * Bleibtreusee * Silbersee * Heider Bergsee * Gruhlsee * Margar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swist
The Swist is a stream, long, in the German Rhineland. It rises on the northern edge of the Eifel at 330 metres above sea level and empties from the right and southeast into the Rhine tributary, the Erft, between Weilerswist and (a district of Erftstadt). Occasionally the Swist is also called the ''Swistbach'', and locals often just call it ''der Bach'' ("the stream"). The Swist flows through the municipality Swisttal, the town of Meckenheim and Flerzheim. There are cycle paths by the side of the stream along this stretch. The Swist gave its name to Swisttal and the town of Weilerswist. Its source area is situated at the northern edge of the Eifel. Geography Course Its source lies at in the northern part of the Eifel in the Ahr Hills, north of the village of Kalenborn (Altenahr), Kalenborn in the Verbandsgemeinde Altenahr, collective municipality of Altenahr in the county of Landkreis Ahrweiler, Ahrweiler. The Swist has an average gradient of 5 ‰ and flows initially t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euskirchen (district)
Euskirchen () is a Kreis (district) in the south-west of North Rhine-Westphalia, Germany. Neighboring districts are Aachen, Düren, Rhein-Erft-Kreis, Rhein-Sieg, Ahrweiler, Daun, Bitburg-Prüm, and the Liège province (Belgium). History In 1827 a first district around the city of Euskirchen was created, however much smaller than today. In 1932 the district of Rheinbach was dissolved, whereby the Euskirchen district gained its southern part. In 1972 the Euskirchen district grew again by the inclusion of the Schleiden district. Geography Geographically, the south-western half of the district is inside the Eifel hill chain. This land is hardly suitable for agriculture, and therefore in historical times the region was rather poor. Areas further to the north-east are more flat and have historically been used to grow a variety of crops, most notably sugar beets. The only other source of wealth was the iron ore, but today the many forests there make the area interesting for tourists. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
