What are the differences between weirs and notches?
A notch or a weir is a convenient device for the measurement of discharge in an open channel. 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.
What is weir and barrage?
A weir is an impermeable barrier that is built across a river to raise the water level on the upstream side. 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.
What is the difference between notch and orifice?
An orifice may be defined as an opening provided in the side or bottom of tank or vessel such that the liquid flows through the entire orifice. A notch may be defined as an opening provided in the side of tank or vessel such that the liquid surface in tank is below the top edge of opening.
What is weir for?
Commonly, weirs are used to prevent flooding, measure water discharge, and help render rivers more navigable by boat. In some locations, the terms dam and weir are synonymous, but normally there is a clear distinction made between the structures.
Where are notches used?
A notch is an opening in the side of a measuring tank or reservoir extending above the free surface. These notches are used to measure discharge of open channel flows, by passing or placing or constructing them across the stream.
What are hydraulic notches?
A Notch is a device used for measuring the rate of flow of a liquid through a small channel or a tank. It may be defined as an opening in the side of a tank or vessel such as liquid surface in the tank is below the level of opening. The discharge over notch is measured by measuring the head acting over the notch.
What is the difference between weir and barrage Mcq?
7. 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 weirs and barrages discuss its various component?
The only difference between a weir and a barrage is of gates, that is the flow in barrage is regulated by gates and that in weirs, by its crest height. Barrages are costlier than weirs. Weirs and barrages are constructed mostly in plain areas. The heading up of water is affected by gates put across the river.
Which is the most efficient notch and why?
V-notch will provide more precise results during measuring low discharge as compare to result obtained from rectangular notch. Because rectangular notch area is greater than V-notch.
Which is better Orifice or Venturi?
The Venturi meter can handle large range of flow rates of fluid than the Orifice meter but once the Venturi meter is installed the range of flow rates it can handle becomes fixed. Thus, Orifice meters offer much more flexibility of operation.
What is weir crest?
A weir is an overflow structure placed across the flow. The edge over which the flow occurs is called the crest of the weir. Stage is generally measured relative to the weir crest. The crest of a weir may be sharp (metal plates) or broad (small dams or humps).
How are weirs and notches alike and different?
The rate of flow can be determined by measuring the height of the upstream water level. 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.
How are notches and weirs used in fluid mechanics?
Classification or Types of Notches and Weirs in Fluid Mechanics. A notch means an opening provided in the side of a tank, such that the opening extends even above the free surface of the liquid in the tank. It is in a way, a large orifice having no upper edge. A notch is generally meant to measure the flow of water from a tank.
What are the different types of notches?
According to the shape of opening, notches can be classified as 1 Stepped notch 2 Trapezoidal notch 3 Triangular notch 4 Rectangular notch More
What’s the difference between a jet and a notch?
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. The upper surface of the notch or weir over which the water flows is called the Crest or Sill. A notch or a weir is a convenient device for the measurement of discharge in an open channel.