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Fish Ladders
A fish ladder, also known as a fishway, fish pass, fish steps, or fish cannon is a structure on or around artificial and natural barriers (such as dams, locks and waterfalls) to facilitate diadromous fishes' natural migration as well as movements of potamodromous species. Most fishways enable fish to pass around the barriers by swimming and leaping up a series of relatively low steps (hence the term ''ladder'') into the waters on the other side. The velocity of water falling over the steps has to be great enough to attract the fish to the ladder, but it cannot be so great that it washes fish back downstream or exhausts them to the point of inability to continue their journey upriver. History Written reports of rough fishways date to 17th-century France, where bundles of branches were used to make steps in steep channels to bypass obstructions. A pool and weir salmon ladder was built around 1830 by James Smith, a Scottish engineer on the River Teith, near Deanston, Perthshire ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bonneville Ladder
Bonneville may refer to: People * Benjamin Louis Eulalie de Bonneville (1796–1878), French-born officer in the United States Army, fur trapper, and explorer in the American West * Gerard Bonneville, fictional character in ''Book of Dust'' * Hugh Bonneville (born 1963, English actor * Nicholas Bonneville (born 1760), French writer Places in Belgium * Bonneville, Namur, former municipality in the province Namur, now part of Andenne Places in France * Bonneville, Charente, in the Charente ''département'' * Bonneville, Haute-Savoie, in the Haute Savoie ''département'' * La Bonneville, in the Manche ''département'' * Bonneville, Somme, in the Somme ''département'' * Bonneville-Aptot, in the Eure ''département'' * Bonneville-et-Saint-Avit-de-Fumadières, in the Dordogne ''département'' * La Bonneville-sur-Iton, in the Eure ''département'' * Bonneville-la-Louvet, in the Calvados ''département'' * Bonneville-sur-Touques, in the Calvados ''département'' Places in the Uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canal Lock
A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls. Locks are used to make a river more easily navigable, or to allow a canal to cross land that is not level. Later canals used more and larger locks to allow a more direct route to be taken. Pound lock A ''pound lock'' is most commonly used on canals and rivers today. A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with a single gate was known as a flash lock. Pound locks were first used in China during the Song Dynasty (960–1279 AD), having been pioneered by the Song politician and naval en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Dart
The River Dart is a river in Devon, England, that rises high on Dartmoor and flows for to the sea at Dartmouth. Name Most hydronyms in England derive from the Brythonic language (from which the river's subsequent names ultimately derive from an original Celtic etymology. As the lower stretches of the river are still covered in ancient oak woodlands, it is accepted that the first element derives from *Dar-, meaning oak (derow'', Welsh ''derw''). However the second element (evident in the hard consonantal termination of ''Dar-t'') is less certain, with postulated etymologies from ''Darwent'' / ''Derventio'' (Sacred place of Oak) or ''Darnant'' / ''Darant'' (Oak stream). The Ravenna Cosmography records a number of Latinised names for the area, ''Devionisso Statio'' and ''Deventiasteno'' may represent corrupted doublets of a ''Statio'' (Station) on a river named ''Derventio''. Although the name ''Derventio'' is otherwise unattested for the river, it is an established etymology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uppsala
Uppsala (, or all ending in , ; archaically spelled ''Upsala'') is the county seat of Uppsala County and the List of urban areas in Sweden by population, fourth-largest city in Sweden, after Stockholm, Gothenburg, and Malmö. It had 177,074 inhabitants in 2019. Located north of the capital Stockholm it is also the seat of Uppsala Municipality. Since 1164, Uppsala has been the ecclesiology, ecclesiastical centre of Sweden, being the seat of the Archbishop of Uppsala, Archbishop of the Church of Sweden. Uppsala is home to Scandinavia's largest cathedral – Uppsala Cathedral, which was the frequent site of the coronation of the Swedish monarch until the late 19th century. Uppsala Castle, built by King Gustav I of Sweden, Gustav Vasa, served as one of the royal residences of the Swedish monarchs, and was expanded several times over its history, making Uppsala the secondary capital of Sweden during its Swedish Empire, greatest extent. Today it serves as the residence of the Gover ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Vancouver, British Columbia (district Municipality)
The District of North Vancouver is a district municipality in British Columbia, Canada, and is part of Metro Vancouver. It surrounds the North Vancouver (city), City of North Vancouver on three sides. As of 2016, the District stands as the second wealthiest city in Canada, with neighbouring West Vancouver the richest. The municipality is largely characterized as being a relatively quiet, affluent suburban hub home to many middle and upper-middle-class families. Homes in the District generally range from mid-sized family bungalows to very large luxury houses. A number of dense multi-family and mixed-use developments have popped up across the district in recent years; however, the District remains a primarily suburban municipality. The District is served by the Royal Canadian Mounted Police, British Columbia Ambulance Service, and the District of North Vancouver Fire Department. History For thousands of years, the Indigenous people of North America, Indigenous Squamish people, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meuse (river)
The Meuse ( , , , ; wa, Moûze ) or Maas ( , ; li, Maos or ) 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 Kingdom of France, after Count 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. In 1408, a Burgundian army led by John the Fearless went to the aid of John III against the citizens of Liège, who were in open revolt. After the battle which saw the men from Liège defeated, John ordered the drowning in the Meuse of suspicious burghers and noblemen in Liège. The border remained stable until the annexation of the Three Bishoprics Metz, Toul and Verdun by King Henry II in 1552 and the occupation of the Duchy of Lorraine by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbia River
The Columbia River (Upper Chinook: ' or '; Sahaptin: ''Nch’i-Wàna'' or ''Nchi wana''; Sinixt dialect'' '') is the largest river in the Pacific Northwest region of North America. The river rises in the Rocky Mountains of British Columbia, Canada. It flows northwest and then south into the U.S. state of Washington, then turns west to form most of the border between Washington and the state of Oregon before emptying into the Pacific Ocean. The river is long, and its largest tributary is the Snake River. Its drainage basin is roughly the size of France and extends into seven US states and a Canadian province. The fourth-largest river in the United States by volume, the Columbia has the greatest flow of any North American river entering the Pacific. The Columbia has the 36th greatest discharge of any river in the world. The Columbia and its tributaries have been central to the region's culture and economy for thousands of years. They have been used for transportation since a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Day Dam
The John Day Dam is a concrete gravity run-of-the-river dam spanning the Columbia River in the northwestern United States. The dam features a navigation lock plus fish ladders on both sides. The John Day Lock has the highest lift (at ) of any U.S. lock. The reservoir impounded by the dam is Lake Umatilla, and it runs up the river channel to the foot of the McNary Dam. John Day Dam is part of the Columbia River Basin system of dams. Location John Day Dam is located east of the city of The Dalles, Oregon, and just below the mouth of the John Day River. The closest town on the Washington side is Goldendale, north. The closest town on the Oregon side is Rufus, Oregon. Its crest elevation is approximately above sea level. It joins Sherman County, Oregon with Klickitat County, Washington, upriver from the mouth of the Columbia near Astoria, Oregon. History Construction of the dam began in 1958 and was completed in 1971,https://usace.contentdm.oclc.org/digital/api/collection/p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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