2nd October 2019

icid

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What is Weir in irrigation?

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SEARCH. Home > Resources > Irrigation > Source of Irrigation > Diversion Weirs. DIVERSION WEIRS. Weir is a low obstruction that is built across a river or canal to raise the water level, or in parallel to divert the water. Two types of weirs are used to control flow; an in-stream weir and a diversion weir.

Also asked, what are Weir used for?

Weirs have traditionally been used to create mill ponds. They are also used to prevent flooding, measure discharge, and help render a river navigable. The crest of an overflow spillway on a large dam is often called a weir.

What is the difference between a dam and a weir?

What is the difference between a dam, a weir and a barrage? A weir is an impervious barrier constructed across a river to raise the water level on the upstream side. In a weir the water overflows the weir, but in a dam the water overflows through a special place called a spillway.

What is a weir in fluid mechanics?

Definition. A structure, used to dam up a stream or river, over which the water flows, is called a weir. The conditions of flow, in the case of a weir, are practically the same as those of a rectangular notch. That is why, a notch is, sometimes, called as a weir and vice versa.

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What is the function of a barrage and how do they work?

A barrage is a type of low-head, diversion dam which consists of a number of large gates that can be opened or closed to control the amount of water passing through. This allows the structure to regulate and stabilize river water elevation upstream for use in irrigation and other systems.

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How does the barrage work?

A barrage works rather like a hydroelectric dam, except on a much smaller scale. A huge barrage is built across a river estuary. Gates and turbines are built into the dam wall. These gates are opened, allowing the tide to flow in, and turn the turbines.

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What is the difference between a dam and a barrage?

A barrage is a weir that has adjustable gates installed over top of it, to allow different water surface heights at different times. The water level is adjusted by operating the adjustable gates. A dam is a high impervious barrier constructed across a river valley to form a deep storage reservoir.

4

What is a tidal barrage?

A tidal barrage is a dam-like structure used to capture the energy from masses of water moving in and out of a bay or river due to tidal forces. Turbines are then placed at these sluices to capture the energy as the water flows in and out.

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What is the purpose of a fish ladder?

A fish ladder, also known as a fishway, fish pass or fish steps, is a structure on or around artificial and natural barriers (such as dams, locks and waterfalls) to facilitate diadromous fishes' natural migration.

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What does the fish ladder do?

A fish ladder is a structure that allows migrating fish passage over or around an obstacle on a river. Fish ladder near the south shore of Long Island, where recorded Alewive migration was occurring. The survival of many fish species depends on migrations up and down rivers.

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What is a Diadromous fish?

Diadromous is a general category describing fish that spend portions of their life cycles partially in fresh water and partially in salt water. These represent both anadromous and catadromous fish. Anadromous fishes spend most of their adult lives at sea, but return to fresh water to spawn.

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What is the largest fish in the world?

The largest living cartilaginous fish, of the order Orectolobiformes, is the whale shark (Rhincodon typus), of the world's tropical oceans. It is also the largest living animal that is not a cetacean and, like the largest whales, it is a docile creature that filter-feeds on tiny plankton.

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What are anadromous fish?

An anadromous fish, born in fresh water, spends most of its life in the sea and returns to fresh water to spawn. Salmon, smelt, shad, striped bass, and sturgeon are common examples. A catadromous fish does the opposite - lives in fresh water and enters salt water to spawn. Most of the eels are catadromous.

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What is Potamodromous?

Freshwater (potamodromous) fish migrations are usually shorter, typically from lake to stream or vice versa, for spawning purposes. However, potamodromous migrations of the endangered Colorado pikeminnow of the Colorado River system can be extensive.

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What is Amphidromous?

Definition of Term. amphidromous (english) Refers to fishes that regularly migrate between freshwater and the sea (in both directions), but not for the purpose of breeding, as in anadromous and catadromous species. Sub-division of diadromous.

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Are all sturgeon anadromous?

Most sturgeons are anadromous bottom-feeders which migrate upstream to spawn but spend most of their lives feeding in river deltas and estuaries. Some species inhabit freshwater environments exclusively while others primarily inhabit marine environments near coastal areas, and are known to venture into open ocean.

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Are eels Catadromous?

Eels are scavengers and eat virtually anything dead or alive. The eel is termed catadromous because of its journey from freshwater to the depths of the ocean to spawn. The eel's life is the antithesis of the life of the salmon. Both fish are dependent upon both ocean and freshwater in order to survive.

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What is Oceanodromous?

An oceanodromous fish, like an anadromous or catadromous fish, is a migratory fish. Unlike anadromous or catadromous fish, an oceanodromous fish spends its whole life in salt water.

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Do fresh water eels bite?

Eels live long and grow quite large. Females, which may spend 20 years in freshwater before undertaking their long spawning migration, reach 52 inches and may exceed 7 pounds. Although they do bite, eels are nonvenomous and put up an impressive battle when hooked.

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Can you be killed by an electric eel?

Can electric eels kill you? A full-grown electric eel can generate about 600 volts of electricity. Although there are few documented instances of people dying from an electric eel's shock, it could happen. A single jolt could incapacitate a person long enough to cause him or her to drown, even in shallow water.

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Can an eel live out of water?

Eels: Some eels, such as the European eel and the American eel, can live for an extended time out of water and can also crawl on land if the soil is moist. Snakehead fish (Channidae): This family of fish are obligate air breathers, breathing air using their suprabranchial organ, which is a primitive labyrinth organ.

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Which fish can live without water?

It sounds like something out of a sci-fi movie, but it's 100% true: Australian officials are closely monitoring the climbing perch (Anabas testudineus), a frighteningly resilient and aggressively invasive fish that can live out of water for six days as it crawls across dry land.

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Which fish can live over 100 years?

That makes the Greenland shark the longest-lived vertebrate. Some koi fish have reportedly lived more than 200 years, the oldest being Hanako, which died at an age of 226 years on July 7, 1977. Orange roughy, also known as deep sea perch, can live up to 149 years.

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