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Fish Ladder
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 1714 construction of an old channel bypassing a dam, "originally cut for the passage of fish up and down the river", is mentio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bonneville Ladder
Bonneville may refer to: People * Benjamin Bonneville (1796–1878), French-born officer in the United States Army, fur trapper, and explorer in the American West * Hugh Bonneville (born 1963), English actor * Nicholas Bonneville (1760–1828), French writer * Ray Bonneville (born 1948), Canadian-born American musician * Gerard Bonneville, a fictional character in ''Book of Dust'' Places Belgium * Bonneville, Namur, former municipality in the province Namur ** Bonneville Castle, a stately home in Bonneville France * Arrondissement of Bonneville, in the Haute-Savoie department ** Bonneville, Haute-Savoie, in the Haute-Savoie department *** Bonneville station, a railway station in Bonneville * La Bonneville, in the Manche department * Bonneville, Charente, in the Charente department * Bonneville, Somme, in the Somme department * Bonneville-Aptot, in the Eure department * Bonneville-et-Saint-Avit-de-Fumadières, in the Dordogne department * La Bonneville-sur-Iton, in the Eure departm ... [...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 chamber in a permanently fixed position in which the water level can be varied. (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. Over time, more and larger locks have been used in canals to allow a more direct route to be taken. History Ancient Egypt In Ancient Egypt, the river-locks was probably part of the Canal of the Pharaohs: Ptolemy II is credited by some for being the first to solve the problem of keeping the Nile free of salt water when his engineers invented the lock around 274/273 BC. Ancient China During 960–1279 CE, the natural extension of the flash lock, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Migration
Fish migration is mass relocation by fish from one area or body of water to another. Many types of fish migrate on a regular basis, on time scales ranging from daily to annually or longer, and over distances ranging from a few metres to thousands of kilometres. Such migrations are usually done for better feeding or to reproduce, but in other cases the reasons are unclear. Fish migrations involve movements of schools of fish on a scale and duration larger than those arising during normal daily activities. Some particular types of migration are ''anadromous'', in which adult fish live in the sea and migrate into fresh water to spawn; and ''catadromous'', in which adult fish live in fresh water and migrate into salt water to spawn. Marine forage fish often make large migrations between their spawning, feeding and nursery grounds. Their movements are associated with ocean currents and with the availability of food in different areas at different times of the year. The migratory ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dmitry Sergeyevich Pavlov
Dmitry (); Church Slavic form: Dimitry or Dimitri (); ancient Russian forms: D'mitriy or Dmitr ( or ) is a male given name common in Orthodox Christian culture, the Russian version of Demetrios (, ). The meaning of the name is "devoted to, dedicated to, or follower of Demeter" (Δημήτηρ, ''Dēmētēr''), "mother-earth", the Greek goddess of agriculture. Short forms of the name from the 13th–14th centuries are Mit, Mitya, Mityay, Mit'ka or Miten'ka (, or ); from the 20th century (originated from the Church Slavic form) are Dima, Dimka, Dimochka, Dimulya, Dimusha, Dimon etc. (, etc.) St. Dimitri's Day The feast of the martyr Saint Demetrius of Thessalonica is celebrated on Saturday before November 8 Old Style and New Style dates">Old Style: October 26]. The name day (именины): October 26 (November 8 on the Julian Calendar) See also: Eastern Orthodox liturgical calendar. The Saturday before this is called Demetrius Saturday and commemorates the Orthodox soldier ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Klaas Deelder
Klaas is a Dutch male given and surname. It is the Dutch short form of Nicholas, a Greek name ultimately meaning ''victory of the people''. A traditionally common name in the Netherlands, its popularity declined some 20-fold since 1950. at the 's database of Dutch given names Archaic spellings include Claas and Claes. Among its female derivatives are Klaasje, Clasien, Clasina, Clasine, Clazien, Klasien, Klasina and Klaziena. Klaas also exists as a , though the forms [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Beauly
The River Beauly (, ) is a river in the Scottish Highlands, about 15 km west of the city of Inverness. It is about 25 km long, beginning near the village of Struy, at the confluence of the River Farrar and the River Glass, Strathglass, River Glass (). The river meanders as it flows east, passing to the south of the village of Beauly and into the Beauly Firth. The river was first bridged in about 1817, when Thomas Telford constructed the five arched Lovat Bridge about 1 km south west of Beauly. Sabre Roads, Retrieved 25 March 2017 This bridge carried the A9 road (Great Britain), A9, the main route north, until the Kessock Bridge was opened in 1982. A railway bridge across the river on the outskirts of Beauly was built in the 1860s to carry the Inverness & Ross-shire Railway (now ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aigas Dam
Aigas (Scottish Gaelic: ''Àigeis'', meaning "Place of the Gap") is a small hamlet in the Highland Council area of Scotland. It is 5 miles (8 km) southwest of Beauly and 15 miles (24 km) west of Inverness, on the north bank of the River Beauly. Crask of Aigas is nearby, to the northeast. In the past, Aigas was divided into two parts, ''Easter'' and ''Wester Aigas.'' In 1580, King James VI granted both of these areas of land to Alexander Forbes of Pitsligo, a nobleman of Clan MacFarlane and great-great-grandfather of Alexander Forbes, 4th Lord Forbes of Pitsligo. In 1610 however, ownership of the lands was again transferred by King James to Simon Fraser, 6th Lord Lovat. The lands since passed down the male line of Clan Fraser of Lovat. Archaeological evidence shows settlements around the area of Aigas dating back to the Bronze Age, with ancient dwellings made from local whinstone. Nowadays, Aigas is home to a popular, 9-hole golf course, established in 1993, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydroelectric Dams
Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other renewable sources combined and also more than nuclear power. Hydropower can provide large amounts of low-carbon electricity on demand, making it a key element for creating secure and clean electricity supply systems. A hydroelectric power station that has a dam and reservoir is a flexible source, since the amount of electricity produced can be increased or decreased in seconds or minutes in response to varying electricity demand. Once a hydroelectric complex is constructed, it produces no direct waste, and almost always emits considerably less greenhouse gas than fossil fuel-powered energy plants. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sluice
A sluice ( ) is a water channel containing a sluice gate, a type of lock to manage the water flow and water level. There are various types of sluice gates, including flap sluice gates and fan gates. Different depths are calculated when design sluice gates. Sluices are used for channeling water toward a water mill, including for transporting logs from steep hillsides. Different terms are used regionally for sluices; the terms ''sluice'', ''sluice gate'', ''knife gate'', and ''slide gate'' are used interchangeably in the water and wastewater control industry. Etymology The term "sluice" originates from the Middle English word scluse, which derived from the Old French escluse (modern French: écluse). This, in turn, came from the Late Latin exclusa, a shortening of aqua exclusa, meaning "excluded water" or "a shut-off water channel." The Latin exclusa is the feminine past participle of excludere ("to shut out, exclude"), from *ex-* ("out") and claudere ("to close"). Regional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bellevue, Washington
Bellevue ( ) is a city in the Eastside (King County, Washington), Eastside region of King County, Washington, United States, located across Lake Washington from Seattle. It is the third-largest city in the Seattle metropolitan area, and the fifth-largest city in Washington (state), Washington. It has variously been characterized as a satellite city, a suburb, a boomburb, or an edge city. The population was 151,854 at the 2020 United States census, 2020 census. The city's name is derived from the French term ("beautiful view"). Bellevue is home to some of the world's largest technology companies. Before and after the 2008 recession, its downtown area has been undergoing rapid change with many high-rise projects being constructed. Downtown Bellevue is currently the second-largest city center in Washington state, with 1,300 businesses, 45,000 employees, and 10,200 residents. In a 2018 estimate, the city's median household income was among the top five cities in the state of Wash ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holyoke Dam
The Holyoke Dam, also referred to as the Hadley Falls Dam, or Hadley Falls Station is a granite dam built in tandem with the Holyoke Canal System at Hadley Falls on the Connecticut River, between Holyoke and South Hadley, Massachusetts. The water differential created by the dam produced mechanical hydropower for industrial uses in Holyoke, and later hydroelectric power. The current dam is the third structure to be built across the Great Falls at South Hadley. The dam, along with the Canal System and its Holyoke Testing Flume, Testing Flume, is recognized by the American Society of Mechanical Engineers as a Historic Mechanical Engineering Landmark for its use by Clemens Herschel in the development of the Venturi meter, the first means of measuring large-scale flows, and the McCormick-Holyoke Turbine by John B. McCormick House, John B. McCormick, also known as the Hercules Turbine, which doubled the efficiency of turbines to more than 80% in its time. Background The river between Ho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Connecticut River
The Connecticut River is the longest river in the New England region of the United States, flowing roughly southward for through four states. It rises 300 yards (270 m) south of the U.S. border with Quebec, Canada, and discharges into Long Island Sound between Old Saybrook, Connecticut, Old Saybrook and Old Lyme, Connecticut. Its watershed encompasses , covering parts of five U.S. states and one Canadian province, via 148 tributaries, 38 of which are major rivers. It produces 70% of Long Island Sound's fresh water, discharging at per second. The Connecticut River Valley is home to some of the northeastern United States' most productive farmland, as well as the Hartford–Springfield, Hartford–Springfield Knowledge Corridor, a metropolitan region of approximately two million people surrounding Springfield, Massachusetts, and Hartford, Connecticut. History The word "Connecticut" is a Corruption (linguistics), corruption of the Mohegan word ''quinetucket'' and Nipmuc word ''kw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
