What is the difference between Weir and notch?

A notch may be defined as an opening provided in the side of the tank or vessel such that the liquid surface in the tank is below the top edge of the opening. A weir may be defined as any regular obstruction in an open stream over which the flow takes place.

What is difference between notch and wire?

Basically there is no difference between a notch and a weir, except that a notch is of small size while a weir is of large size. A notch is usually made of metal plate whereas a weir is made of masonry or concrete. The bottom edge over which the water flows is called the sill or the crest of water the notch.

What is the difference between a weir and a orifice?

The weir is a notch cut in a dam to discharge the surplus quantity of water. Water flows over a notch or weir while water passes through an orifice. While the stream of water discharged by an orifice is called a jet, the sheet of water discharged by a notch or weir is called a nappe or vein.

What is notch in weir?

A notch is an opening in the side of a measuring tank or reservoir extending above the free surface. A weir is a notch on a large scale, used, for example, to measure the flow of a river, and may be sharp edged or have a substantial breadth in the direction of flow.

Which is bigger notch or weir?

Notch is used for measuring the rate of flow of a liquid through a small channel or a tank. But weir is used for measuring the rate of flow of water in rivers or streams. Notch is of a smaller size and weir is of bigger size.

Difference between Notch and Weir

Where is a notch used?

Notches are commonly used in material impact tests where a morphological crack of a controlled origin is necessary to achieve standardized characterization of fracture resistance of the material. The most common is the Charpy impact test, which uses a pendulum hammer (striker) to strike a horizontal notched specimen.

What are notches used for?

Notches are not only used to match and align regular seams. They are also used in a variety of other situations that require sewing marks. The following are some instances that require (or benefit from) the addition of notches: Transferring dart marks from pattern onto fabric (at the seam allowance).

What is notch and its type?

A notch is a kind of opening (throughout the width) to the fluid flow, in which fluid flows through the bottom of notch. It is used to regulate the flow of fluid. The bottom end of the notch is generally made sharp so that it offers minimum resistance to the fluid flow (generally water).

What is weir and its types?

A weir is a concrete or masonry structure which is constructed across the open channel (such as a river) to change its water flow characteristics. Weirs are constructed as an obstruction to flow of water. These are commonly used to measure the volumetric rate of water flow, prevent flooding and make rivers navigable.

What is notch in civil engineering?

Notch. A notch may be defined as an opening in one side of a tank or a reservoir, like a large orifice, with the upstream liquid level below the top edge of the opening. Since the top edge of the notch above the liquid level serves no purpose, therefore a notch may have only the bottom edge and sides.

What is difference between weir and barrage?

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.

What is difference between open channel flow and close channel flow?

However the major difference is that the flow in closed conduit is influenced by pressure in the line whereas same in open channel it only by gravity. And in case of closed conduit fluid does not come in contact with atmosphere, whereas in open channel it is in touch with atmosphere.

What is the difference between orifice and mouthpiece?

An orifice is an opening made in the side or bottom of tank, having a closed perimeter, through which the fluid may be discharged. A mouthpiece is short tube fitted to a same size circular opening provided in a tank so that fluid may be discharged through it.

Why is weir used?

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.

Why weir is provided?

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.

What is apron in weir?

Upstream apron: It protect it during floods from eroding action. Its length depends upon discharge of river and weir's length. It also help to prevent leakage in subsoil and it minimizes uplift water pressure if any exist.

Why are notches made?

A notch is typically cut in the tube stock to allow for the perpendicular attachment of another piece of tube stock or metal. This allows as much of a connection between the two materials being welded together as possible.

What is the opposite of notch?

Opposite of a dent or hollow in a surface. bulge. camber. convexity.

What is the difference between clipping and notching?

Unlike clipping, which allows fabric to spread out, notching enables it to come closer together without the bulk, by removing the excess fabric. So it will now lie neat and flat without any bunching, like the last photo above!

What is an example of a notch?

The definition of a notch is a cut in the shape of a "V" or a step or degree of measurement. An example of a notch is a V-shaped cut for hanging tools. An example of notch is a level of music loudness, turn up the sound a notch. (informal) A level or degree.

What is difference between laminar and turbulent flow?

Laminar flows are smooth and streamlined, whereas turbulent flows are irregular and chaotic. A low Reynolds number indicates laminar flow while a high Reynolds number indicates turbulent flow. The flow behavior drastically changes if it is laminar vs. turbulent.

What is the difference between channels and pipes?

Pipe flow Vs Open channel Flow

Open Channel Flow is a type of fluid flow in a conduit with a free surface open to the atmosphere. The pipe flow is a type of flow within a closed conduit.

What is the difference between uniform and nonuniform flow?

- A steady flow through a long straight pipe of a constant diameter is an example of uniform flow. Non-uniform Flow is a flow in which characteristics and parameters vary and are different at different locations along the flow path.

What is difference between reservoir and dam?

Dam is created as a barrier that stops or restricts the flow of water or underground streams. Whereas, Reservoir is an open-air storage area (usually formed by masonry or earthwork) where water is collected and kept in quantity so that it may be drawn off for use.