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Barrages are built near cities so that the amount of water flowing in the river can be controlled by opening and closing the gates to save the city from flooding. A weir, in contrast, is built, for example, in tourist destinations and preservation areas to allow the fish to swim upstream.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.What is the difference between a weir and a barrage? Explanation: Barrage is almost a similar structure like a weir, but the difference is that barrage is not a solid obstruction across a river and moreover the heading of the river is controlled by gates alone. The crest level in barrage is kept at low level.
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What is the difference between a dam, a weir 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 …
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Date Published: 4/2/2022
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What is the difference between weirs and barrages? – Quora
“A weir is an impermeable barrier that is built across a river to raise the water level on the upstream se. On the other hand, a barrage involves adjustable …
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Difference Between Weirs and Barrages | Benefits &Functions …
A barrage is a dam built across the bed of a river to allow for variations in the water level. Weirs are built across the river to control the …
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What is the difference between weir barrage and a dam?
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.
What is the difference between weir and barrage Mcq?
What is the difference between a weir and a barrage? Explanation: Barrage is almost a similar structure like a weir, but the difference is that barrage is not a solid obstruction across a river and moreover the heading of the river is controlled by gates alone. The crest level in barrage is kept at low level.
What is the difference between dam barrage and reservoir?
Dam and reservoirs are constructed across a river valley for water storage and to hold back the water flow. Major difference between a dam and barrage is that, Dam built for water storage the lake is called as reservoirs and barrage build to divert the river water.
What is the purpose of a weir?
A weir is a small dam built across a body of water, such as a river. We use them to help control the flow of water. Weirs can help raise the water level so that boats can pass through, and they can also reduce the flow of water to prevent flooding.
What is difference between barrage and bridge?
Barrage is a structure bulit over a river to control the flow of water with the help of gates. So water would be accumulated and it could be used when required. A Bridge is a structure built to cross a obstruction without stopping the flow/traffic beneath.
Is barrage bigger than dam?
Unlike a dam, which will raise waters nearly to its height, a barrage will only raise the water level by a few feet. This is also useful for navigation, because a barrage can increase the depth of a river by a few feet.
What is non gravity weir?
Explanation: In Gravity weir, the weight of the weir balances the uplift pressure caused by the seepage water. In non-gravity weirs, the weight of the concrete slab and the divide piers together keep the structure safe against the uplift.
What is parabolic weir?
Parabolic weir is a special type of weir which governs the flow depth exponent as two. Parabolic weirs are governs the merits of rectangular weirs as well as that of triangular weirs.
What is a spillway used for?
Spillways are structures that either form part of a dam, or are found just beside one. They are used, when a reservoir is full, to pass floodwater safely, and in a controlled way, over a dam, around it or through it. Next time you visit a dam, look for its spillway.
What is an example of barrage?
An example of a barrage is when 100 reporters all shoot questions at the president at the same time. An example of barrage is a large amount of gunfire with the purpose of keeping the enemy forces from moving forward.
What are the benefits of barrages?
- The barrage has good control over the river during the flood. The outflow can be easily regulated by gates.
- There is good control over silt entry into the canal.
- A roadway can be conveniently provided over the structure at a little additional cost.
How do barrages work?
The barrage reservoir is filled up passing through turbine tunnel. This flow of water spins the turbine and generates electricity. This formation of barrage is a one-way system, i.e., one can only utilize the energy flowing through high tide to tidal basin which makes it restricted to about 6 h per tidal cycle.
What is another word for weir?
| barrier | wall |
|---|---|
| dam | barrage |
| levee | dike |
| embankment | obstruction |
| gate | bank |
What are types of weir?
The common shapes of weirs are, rectangular, triangular, trapezoidal, composite, parabolic and proportional. The sheet of water which springs free from the crest is called the nappe. If the sheet of water springs free as it leaves the crest, the weir is called a sharp crestel weir.
What are some disadvantages of a weir?
- Spacious Upstream Weir Pool Required.
- Cold Weather Can Compromise Readings.
- Discharge Must Be Free-Spilling.
- Weir Maintenance Is Extensive.
- Weirs and Flumes From Tracom.
Whats is a dam?
A dam is a structure built across a river or stream to hold back water. People have used different materials to build dams over the centuries. Ancient dam builders used natural materials such as rocks or clay. Modern-day dam builders often use concrete. Manmade dams create artificial lakes called reservoirs.
What is weir in dam?
A weir is a small barrier built across a stream or river to raise the water level slightly on the upstream side; essentially a small-scale dam. Weirs allow water to pool behind them, while allowing water to flow steadily over top of the weir.
How do I choose a barrage and weir site?
- The site must have a good command over the area to be irrigated and also must not be at too far distance to avoid long feeder channels.
- The width of the river at the site should be preferably minimum with a well-defined and stable river approach.
What are the different types of weirs?
- Sharp-crested weir.
- Broad- crested weir.
- Narrow-crested weir.
- Ogee-shaped weir.
Difference Between Weir and Barrage
Difference Between Weir and Barrage
Posted at 03:17h in Gates, Resources by Content in Design
Various hydraulic structures are constructed across the river to function as a retention for upstream water, used for different purposes. In general, dams, weirs, and barrages function to help generate electricity, used in irrigation, and for common human needs, especially during times of flood or overflowing water. There is some confusion around the difference between weirs and barrages, more particularly how they fit in the spectrum of dams category as a whole. Effectively, both weirs and barrages are what’s called headworks that are used to increase the head of water on the upstream side.
In this article, you will learn the differences between a weir and barrage.
Weirs
A weir is simply a concrete or masonry structure that is built through an open channel, for instance, a river. In most cases, it is built to control water flow, measure the discharge, prevent flooding and make rivers navigable. It can be built with different materials such as wood, concrete or a mixture of rocks, gravel, and boulders depending on age and purpose.
Barrages
On the other hand, a barrage is a concrete structure that consists of a series of large gates that can be opened or closed to control the amount of water that flows through them. This allows the structure to adjust and stabilize the elevation of the upstream water for irrigation and other systems. The valves are positioned between the pillars that have the task of supporting the water load of the pool created.
Differences Between Weirs & Barrages
A weir is an impermeable barrier that is built across a river to raise the water level on the upstream side. Here, the water level is at the required height and excess water then can flow over the weir.
It is usually built on the other side of a flooded river.
On the other hand, a barrage involves adjustable gates installed over a dam to maintain the water surface at different levels and at different times. The water level is adjusted by opening the valves or gates. These gates are supported by pillars at both ends and are also positioned at different levels. They are usually operated by cables from the cabin.
Both weirs and barrages are obstacles to the watercourse, but the barrage is an expensive structure, while the weir is a relatively cheap structure.
Barrages are built near cities so that the amount of water flowing in the river can be controlled by opening and closing the gates to save the city from flooding. A weir, in contrast, is built, for example, in tourist destinations and preservation areas to allow the fish to swim upstream.
Similarities Between Weirs & Barrages
They’re both used to control floods.
Both help to make a river navigable.
Both measure discharge.
Examples: Difference Between Weir & Barrage
Kentchurch Weir, Wales, United Kingdom
Kentchurch Weir was located on the River Monnow in the Kentchurch estate near Hereford, where the river marks the border between England and Wales (counties of Herefordshire and Monmouthshire respectively).
In 2008, EA Wales, supported by Atkins, built a fishing route at Osbaston Weir, also located on the River Monnow, about 3 km upstream of the confluence with the River Wye. This project has restored the connectivity of habitats in the lower watershed of the River Monnow after centuries of fragmentation.
In the upper part of Monnow, there is excellent fluvial habitat, however, the potential of this habitat has not been fully exploited, as it is inaccessible due to the two-meter height threshold. The removal of the weir was preferable to the creation of an on-site fishing route and restore the full connectivity of the habitat, with a significant improvement in biodiversity and allowing for the transport and uninterrupted supply of river gravel downstream. A weir is a barrier built across a river that changes the flow of the river. Depending on the design, some pose a problem for fish since the fish cannot get across the weir.
What made it different?
Routine surveys of fish prior to sampling have confirmed the absence of upstream salmons. Three years earlier, before the removal, it was a natural passage of fish around the other spillway on the mainstream. The migratory salmon was observed to jump to the spillway at Kentchurch, although they were unable to cross.
The effect of the weir was studied before removal, and it showed a significant change in river morphology with reduced erosion.
The ecological status of the Monnow River was well equipped for fish migration.
Sukkur barrage, Sindh, Pakistan
Sukkur Barrage is a barrage on the Indus River near the town of Sukkur, in the Pakistani province of Sindh. The barrage was constructed during the British Raj from 1923 to 1932 and was called Lloyd Dam. The Sukkur barrage is in fact, the pride of Pakistan’s irrigation system since it is the largest irrigation system of its kind in the world. It irrigates Sukkur district in the north, and Mirpurkhas districts in the south. It is located about 300 miles northeast of Karachi and 3 miles below Sukkur Gorge. The introduction of an irrigation system controlled by a dam has made it possible to supply the existing cultivated areas in the Pakistani province of Sindh more quickly.
The idea of the Sukkur Dam was conceived by Mr. C.A. Fife in 1868. However, the project was finally approved in 1923. It was built under the general direction of Sir Charlton Harrison, CIE, as chief engineer, while Sir Arnold Musto, as the architect and project engineer. Work on the head and canals was completed in 1932. Once completed, it was opened by His Excellency the 1st Count of Willingdon, Viceroy of India.
Sindh survives almost entirely on water from the Indus. This is because groundwater is very limited. Rainfall in the province averages between 150 to 200 mm per year, while the evaporation rate is between 1,000 and 2,000 mm. Thus, Sindh is arid and it is the only barrage that irrigates other barren lands.
What makes the Sukkur Dam different?
The Sukkur Dam is used to control the flow of water into the Indus for irrigation and flood control. It is the backbone of the economy as it allows water to flow through what was originally a network of seven channels that fed the world’s largest irrigation system. The second-largest channel is the Rohri channel which, although slightly shorter than the Nara channel, still absorbs a much larger flow than the first. Its arable area amounts to 2.6 million hectares for irrigation. Cotton, wheat, and sugar cane are the main crops of this system of canals.
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. The water is raised up to the required height and the water then flows over the weir. In a weir the water overflows the weir, but in a dam the water overflows through a special place called a spillway. 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. Weirs can be built of wood, concrete or moraine material (rocks, gravel, boulders). Small weirs are used many times as one possible mitigation measure in large hydropower developments, along with fish ladders, fish stocking and substrate improvement because low weirs can improve fish recruitment, stabilize groundwater levels and lessen the effects of river regulation that often accompanies very large hydro projects. Small weirs usually have positive benefits on winter fish survival, increased biodiversity and the landscape aesthetics. However, they can also can result in increased sedimentation, changes in the fish community and can pose migration barriers.
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. The surplus water is not allowed to flow over the dam, but it flows through the spillways provided at some level built into the dam.
Weir & Barrage Questions and Answers
This set of Irrigation Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Diversion Head Works – Weir and Barrage”.
1. Into how many groups the gravity weir is sub-divided?
a) 5
b) 4
c) 3
d) 2
View Answer
Answer: c
Explanation: According to the material used and certain design features, the gravity weir is sub-divided into three groups. They are vertical drop weir, sloping weir, and parabolic weir. Sloping weir is again classified into two groups, namely masonry slop weir and dry stone slope weir.
2. In gravity weir, the uplift pressure is due to the seepage of water.
a) True
b) False
View Answer
Answer: a
Explanation: In gravity weir, the uplift pressure is due to the seepage of water below the floor and is resisted entirely by the weight of the floor.
3. The uplift pressure in non-gravity weir is resisted by the bending action.
a) False
b) True
View Answer
Answer: b
Explanation: In non-gravity type weir the thickness of the floor is relatively kept less, and the uplift pressure is largely resisted by the bending action of the reinforced concrete floor.
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4. Which type of weir is suitable for any type of foundation?
a) Sloping Weir
b) Vertical Drop Weir
c) Parabolic Weir
d) Masonry Sloping Weir
View Answer
Answer: b
Explanation: This type of weir is suitable for kind of foundation because it is provided with or without crest gates, cutoff piles are provided at both upstream and downstream, to protect against scouring aprons are provided at both up and down streams, and at downstream to relieve uplift pressure graded inverted filter is provided.
5. What type of weir does the diagram represent?
a) Parabolic Weir
b) Gravity Weir
c) Dry Stone Slope Weir
d) Vertical Drop Weir
View Answer
Answer: c
Explanation: The figure represents a sloping weir made up of dry stone or rock fill. It also represents body walls at both upstream and downstream sides and rock falls laid in the form of glacis with few intervening core walls.
6. What is the main difference between a dam and weir?
a) Height and Duration of Storage
b) Capacity of Water
c) Material used for Construction
d) Location of the Structure
View Answer
Answer: a
Explanation: Weir is an obstruction across the river to raise its water level and divert into new channel. It can also store water for short duration of time of short supplies, known as storage weir. The only main difference between dam and weir is that dam can store water comparatively for longer duration than weir and the dam is at more height than the weir.
7. What is the difference between a weir and a barrage?
a) Discharge Capacity
b) No Solid Obstruction
c) Storage Capacity
d) Velocity of Flow
View Answer
Answer: b
Explanation: Barrage is almost a similar structure like a weir, but the difference is that barrage is not a solid obstruction across a river and moreover the heading of the river is controlled by gates alone. The crest level in barrage is kept at low level. During floods the gates are kept for discharge of excess waters and when the flood recedes the gates are lowered, thus solving the silting problem.
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8. In which type of weir energy dissipation takes place?
a) Barrage
b) Vertical Drop Weir
c) Sloping Weir
d) Parabolic Weir
View Answer
Answer: d
Explanation: This weir is similar to the spillway section of a dam. The body of this weir is kept as a low dam. A cistern is provided at the downstream side for energy dissipation of the falling waters from upstream to the downstream side.
9. Which type of weir is of recent origin?
a) Vertical Drop Weir
b) Masonry or Concrete Sloping Weir
c) Parabolic Weir
d) Barrage
View Answer
Answer: b
Explanation: This type weir is of recent origin. They are much suitable for soft and sandy foundations and are generally used when the difference between the weir crest and downstream river bed is limited to 3 metres.
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10. What number of causes is responsible for the failure of weirs?
a) 2
b) 4
c) 3
d) 1
View Answer
Answer: b
Explanation: Mainly four causes are responsible for the failure of weirs. They are piping, rupture of floor due to uplift, rupture of floor due to suction caused by standing wave, and scouring at the upstream and downstream side of the weir floor.
Sanfoundry Global Education & Learning Series – Irrigation Engineering.
Difference Between Dam Reservoir and Barrage
Dam and reservoirs are constructed across a river valley for water storage and to hold back the water flow. Major difference between a dam and barrage is that, Dam built for water storage the lake is called as reservoirs and barrage build to divert the river water.
Dam
A Dam is a massive structure that hold the water flow of the river through spillways. The dams are primarily used to save water and generate hydro power.
Tehri Dam
Bhakra Dam
Hirakud Dam
Reservoir
Reservoir is a man made lake created by Dam that holds the back water,primarily used for storage purpose. Indira Sagar reservoirs in Madhya Pradesh is the largest reservoirs in India.
Indira Sagar
Nagarjuna Sagar
Sardar Sarovar
Barrage
Barrage is a type of small dam with large gates,build to divert the river water for irrigation systems. The barrage also carries road bridge,gas pipeline or a train link.
Why are Concrete Weir Walls so Important?
16th June 2021
A weir is a small dam built across a body of water, such as a river. We use them to help control the flow of water. Weirs can help raise the water level so that boats can pass through, and they can also reduce the flow of water to prevent flooding. So, it is vital that you have a strong concrete weir wall in order to effectively control the flow. There are several different types of weirs in use so it is crucial to know how each controls the flow of water. Here are the different types of weirs and why concrete weir walls are so important.
Types of Weirs
These are the most common types of weirs out there:
V notch weir – This type of weir features a concrete weir wall with a V shaped notch in the middle. The wall itself is higher than the water level and creates a barrier that forces the water to flow through the notch. Other variations include rectangular and trapezoidal notch weirs.
Broad crested weir – This is one of the most common types of weir you can find. Broad crested weirs use flat reinforced concrete and cover the width of the water source. The water then flows over the crest creating a more manageable flow on the other side. Other variations include sharp and narrow crested weirs.
Compound weir – These types of weirs combine two or more designs into one structure. For example, a compound weir may be broad crested for most of its length, but include a small open section that allows river traffic to flow through. Another example would be to combine a v notch weir with a rectangular for different flow rates.
Benefits of Concrete Weir Walls
There are a number of ways in which concrete weirs are beneficial:
Weirs help to measure and control the flow of water in rivers and other water sources. This can help prevent flooding, stabilise water levels, and improve the quality of aquatic life in the water.
Concrete is one of the most durable and resilient materials for weirs. It is also one of the most environmentally safe and low maintenance materials around.
Weirs are adjustable according to how much water flow you need to control. You can even combine a number of designs to further control flow or access to the river.
The initial cost of building a concrete weir is low compared to other types of water control systems such as barrages.
JKH Ltd
Here at JKH Ltd, we design and construct several different designs for concrete weir walls and end walls suitable for any water source. We can work with you to design any type of concrete wall for your project. To find out more about our range of weir walls and other concrete products, please browse our website or speak with our friendly team via phone. For high quality concrete wall solutions for any project, contact JKH Ltd today.
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. The water is raised up to the required height and the water then flows over the weir. In a weir the water overflows the weir, but in a dam the water overflows through a special place called a spillway. 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. Weirs can be built of wood, concrete or moraine material (rocks, gravel, boulders). Small weirs are used many times as one possible mitigation measure in large hydropower developments, along with fish ladders, fish stocking and substrate improvement because low weirs can improve fish recruitment, stabilize groundwater levels and lessen the effects of river regulation that often accompanies very large hydro projects. Small weirs usually have positive benefits on winter fish survival, increased biodiversity and the landscape aesthetics. However, they can also can result in increased sedimentation, changes in the fish community and can pose migration barriers.
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. The surplus water is not allowed to flow over the dam, but it flows through the spillways provided at some level built into the dam.
Difference Between Weir And Barrage
Difference Between Weir And Barrage:
The difference between weir and barrage is described below.
Weir:
Weir is an impenetrable boundary which is developed over a river or waterway to raise the water level on the upstream side. In this system, the water level is raised up to the required height and the excess water is permitted to discharge over the weir. Weir is mainly constructed across an immersion river or waterway.
Barrage:
When adjustable gates are installed in a weir to keep up the surface the water at a diverse level at various times, is called barrage.
In this system, the water level is balanced by operating the shutters or gates. The gates are provided at different levels and operated by cables from a cabin. These gates are supported on piers at both ends. The pier to pier distance is called a bay.
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Difference Between Weir And Barrage
There is some confusion around the difference between weirs and barrages, more particularly how they fit in the spectrum of the dams category as a whole. Effectively, both weirs and barrages are what’s called headworks that are used to increase the head of water on the upstream side. In this article, you will learn the differences between a weir and barrage.
Weirs
A weir is simply a concrete or masonry structure that is built through an open channel, for instance, a river. In most cases, it is built to control water flow, measure the discharge, prevent flooding, and make rivers navigable. It can be built with different materials such as wood, concrete, or a mixture of rocks, gravel, and boulders depending on age and purpose. In a weir, the water overflows the weir, but in a dam, the water overflows through a special place called a spillway.
Barrages
On the other hand, a barrage is a concrete structure that consists of a series of large gates that can be opened or closed to control the amount of water that flows through them. This allows the structure to adjust and stabilize the elevation of the upstream water for irrigation and other systems. The valves are positioned between the pillars that have the task of supporting the water load of the pool created.
Click Here To See Different Types Of Engineering Dam
Difference Between Weir and Barrage
In this article, we have described the difference between Weir and Barrage.
Weir:
Weir is an impenetrable boundary that is developed over a river or waterway to raise the water level on the upstream side. In this method, the water level is raised up to the needed height and the extra water is permitted to discharge over the weir. Weir is primarily constructed across an immersion river or waterway.
Weir
Barrage:
When adjustable gates are installed in a weir to keep up the surface of the water at a diverse level at various times, is known as a barrage.
In this method, the water level is balanced by operating the shutters or gates. The gates are provided at different levels and operated by cables from a cabin. These gates are supported on piers on either side. The pier to pier distance is known as the bay.
Barrage
Differences Between Weirs & Barrages
Benefits &Functions of Weirs and Barrages – HPD TEAM
What is a Barrage? | Difference Between Weirs and Barrages | Benefits &Functions of Weirs and Barrages
What is a Barrage? What is a Weir? | Difference Between Weirs and Barrages | Benefits and Functions of Weirs and Barrages
What is a Barrage?
A barrage is a low-head diversion dam that consists of a series of big gates that may be opened and closed to control the volume of water that flows through.
This enables the structure to regulate and stabilize the elevation of river water upstream for use in irrigation and other systems.
The gates are placed between flanking piers, which are responsible for supporting the pool’s water weight. The name “barrage” is derived from the French word “barrer,” which means “to bar.”
A barrage is a steel-gated construction used to impede a water stream. The barrage gates can be raised to control the release of water from the barrage.
A barrage is created when moveable gates are erected above a weir to keep the water surface at different levels at different periods.
The water level is controlled by opening and closing the gates or shutters. The gates are located on separate tiers and are controlled by cables from the cabin. Both ends of the gates are supported by piers.
What is a Weir?
A weir is essentially a concrete or masonry structure constructed through an open waterway, such as a river. Most of the time, it is constructed to control water flow, measure discharge, prevent flooding, and make rivers navigable.
Depending on the purpose, it can be created using a variety of materials such as wood, concrete, or a combination of pebbles, gravel, and boulders.
A weir is a river barrier that raises the water level on the upstream bank of the river. It is mostly a wall of impediment over which extra water flows, rather than a reservoir to store water.
It is made of concrete, rocks, or a combination of the two.
Difference Between Weirs and Barrages
There are many ways to create a waterway, but the two most common types of waterway waterways are the weir and the barrage.
A weir is a type of dam that is typically constructed to measure the height of the water level in a river or any other body of water. The weir creates an area of falling water, which turns a turbine that generates electricity.
A barrage, on the other hand, is a concrete structure made up of a series of wide gates that can be opened and closed to control the amount of water that flows through them.
This enables the structure to modify and stabilize the upstream water elevation for irrigation and other systems. The valves are installed between the pillars, which are responsible for supporting the pool’s water weight.
Barrages are typically canals that traverse a valley, connecting two bodies of water. They are created by building an artificial canal with a series of locks.
Barriers are typically used for flood control and/or more powerful hydroelectric power generation, while weirs are more for regulating water flow. They also generate hydroelectric power, but they do not have the same effect of storing water or risk being a flood control system.
Both weirs and barrages are waterway barriers, however the barrage is a costly barrier, whilst the weir is a comparatively inexpensive one.
Weirs and barrages FAQs
1. What is the difference between weirs and barrages?
A barrage is a dam built across the bed of a river to allow for variations in the water level. Weirs are built across the river to control the volume of water flow.
A weir is an impermeable barrier constructed across a river to raise the water level on the downstream side.
The water level is at the appropriate height, any extra water can then flow over the weir. It is typically constructed on the other side of a flooded river.
A barrage, on the other hand, consists of adjustable gates built over a dam to keep the water surface at different levels and at different periods.
By opening the valves or gates, the water level can be regulated. These gates are supported at both ends by pillars and are also positioned at different levels. They are normally controlled by cables that go from the cabin.
Both weirs and barrages are waterway barriers, however the barrage is a costly barrier, whilst the weir is a comparatively inexpensive one.
2. What are weirs?
A weir is a structure that consists of a number of barriers designed to control the water flow.
They are typically made of concrete and are located at the foot of a dam. The purpose is to control the river’s flow, improve navigation, etc.
3. What are barrages?
Barriers are concrete structures placed at different levels above a weir that control water height. They can be used for different types of purposes like navigation and hydroelectricity power generation and more.
4. What are the benefits of a barrage compared to a weir?
A barrage is very versatile. It has the ability to control water levels while releasing it in different ways, and can also be used for irrigation purposes, navigation and/or hydroelectricity generation of power.
Unlike a barrage, weirs are typically only used for their ability to store water and regulate the level.
5. What is a “flood”?
A flood is the large amount of water that flows over a barrier in an event. Floods are flooding events that occur at river’s natural banks as part of a greater storm.
The upward movement of the water can cause it to flood adjacent land and disrupt transportation, agriculture, communication, and other societies.
6. What are “floods” used for?
A flood is the large amount of water that flows over a barrier in an event. Floods are flooding events that occur at river’s natural banks as part of a greater storm.
The upward movement of the water can cause it to flood adjacent land and disrupt transportation, agriculture, communication, and other societies.
7. What is a V-notch weir?
A V-notch weir is the most basic form of weir. It consists of two gabion baskets placed perpendicular to the flow of the water, with a hole in between them for excess water to flow through. T
he weir is made of rocks, sand, or gravel, and the structure is made of concrete.
The dam can be filled with stones to prevent erosion and water accumulation.
8. What is a hanging weir?
A hanging weir consists of a series of barriers that are suspended from chains attached to the top of a dam.
The chain is attached to a platform by four anchors at each end that are placed in holes in the ground. The structure can be created with stones, rocks, or boulders. The holes are full of concrete.
9. What is a sluice gate?
A sluice gate is a kind of barrier that consists of a series of alternating openings and closed panels to control water flow through it.
The length and height of each opening can be varied, creating different flows. They are typically used to drain water from an artificial reservoir or to divert water between two bodies.
They can also be used to admit or exclude fish, or for the operation of water mills or other industrial machinery.
10. What is a T-notch weir?
A T-notch weir is a form of weir that is made up of two gabion baskets placed perpendicular to the flow of the water. It has two holes that can be controlled for increased water flow. It is used to make the water level higher or lower.
11. What are the benefits of weirs?
They are the most common types of waterway barriers. They can be used to control water levels and for drainage. They are relatively inexpensive and easy to build.
12. Why is a weir important?
Weirs are more effective than other types of barriers. Weirs and barrages can be built on natural river banks, allowing the benefits of natural flow to occur without the risks associated with constructing artificial dams.
Difference between Weir, Barrage and Dam
Hydraulic structures are constructed across the river to retain water at upstream side so that it can be used in future for different purposes. The basic purpose of hydraulic structure is to store water in reservoir for generating electricity, for irrigation and for general needs by humans. There are different types of hydraulic structures constructed according to needs and financial aspects.
In this short article the difference between weir, barrage and dam shall be discussed.
Weir :
The Weir is an impervious barrier constructed across the river to raise water level on the upstream side, such that the water level rises upto the required height and the surplus water is allowed to flow over the weir.
Weir is generally constructed across the inundation river.
Barrage :
The Barrage is an upgradation of Weir in which adjustable gates are installed over the weir to maintain the water surface at different levels at different times. The water level is adjusted by operating adjustable gates. These gates are operated by cables.
Dam :
The Dam is a high impervious structure constructed across the river to form deep storage reservoir. The Dam is designed such that the water level remains under summit (i.e. surplus water is not allowed to flow over the dam). The water is allowed to flow through spillways provided at some designed levels.
Tags : barrage, weir vs dam, dam, weir, types, difference.
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