Definition of weir

1 : a fence or enclosure set in a waterway for taking fish. 2 : a dam in a stream or river to raise the water level or divert its flow.

What is a weir used for?

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 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 weir in irrigation?

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.

What is 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 spillway or weir?

a spillway is a structure used to provide the controlled release of flows from a dam.It is designed to allow water to flow freely over the dam. wier section is a barrier across a river designed to alter its flow .

What is the main difference between a dam and a 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.

What is a weir structure?

By definition, a weir is a man-made structure designed to alter a river’s flow characteristics and measure flow rates. A weir is a low lying barrier similar to a dam, but instead of stopping water significantly, it uses its structure to slow down or manipulate water flow for various purposes.

What is weir and notch?

Weirs are notches cut in a dam to discharge the surplus quantity of water. The primary difference between a notch and a weir is their quantity or scale at which they measure liquid. A notch is like a large orifice with no upper edge. The water flows over the notch or weir while water passes through an orifice.

How many types of weir are there?

1. How many types of weirs are there based on the shape of the crest? Explanation: The four types are sharp-crested, broad-crested, narrow-crested and ogee-shaped weir.

What are weirs and flumes?

Flumes and weirs are obstructions placed in a channel to measure flow. In general weirs raise the channel invert, and flumes narrow the channel width. With both these devices, critical flow is created in some part of the device. At critical flow one depth measure is sufficient to determine flow rate.

What is apron in weir?

2. 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.

What is a weir in a pool?

A weir is a type of barrier across a river that is created to adjust or alter its flow. With this in mind, a weir for a swimming pool is a barrier in a skimmer over which water flows. A floating weir raises and lowers its level to match the water level in a pool or spa.

Who invented weir?

The founding of Weir

In 1871, two brothers, George and James Weir, founded the engineering firm of G & J Weir, joining the booming industrial scene in the west of Scotland.

What is river barrage?

Definition: A barrage is a barrier built across a river for diversion of water for useful purposes such as irrigation, water supply etc.

What is storage weir?

Vaalharts Storage Weir is a dam in South Africa. It was established in 1936. Vaalhartz Weir (alternative spelling) is located on the Vaal River approximately 100 km downstream of Bloemhof Dam and 13 km upstream of Warrenton.

What is vertical drop weir?

ADVERTISEMENTS: Vertical drop weir is such a weir, whose D/S face is given steep batter. The U/S face is mostly vertical, but it can also be given batter like D/S face.