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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. ... In a weir, the surface over which the water flows is known as the crest.
- What is the purpose of a weir?
- How do weirs affect rivers?
- What is weir in irrigation?
- What is the difference between a dam and a weir?
- What is a weir in a pool?
- How do Weirs work?
- What is the purpose of locks and weirs?
- How do weirs stop flooding?
- What is a Rock weir?
- How do you escape a weir?
- What is a weir and why it is constructed?
- What does the word weirs mean?
- How do weir skimmers work?
- What is weir basket?
- Why do pool skimmers have two holes?
What is the purpose of a weir?
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.
How do weirs affect rivers?
Weirs stop natural processes and impact river channels in two main ways; Upstream – Sediment transport is interrupted by the weir, sediment (e.g. gravel) accumulates upstream. ... The river begins at one elevation and incises downward through its bed while leaving its floodplain behind [higher]) throughout its course).
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. ... The in-stream weirs are widely used to measure the rate of flow. At flow rates above the threshold flow rate the water level rises above the level of the diversion weir and water is diverted.
What is the difference between a dam and a weir?
Dams: A dam is a big wall constructed across a valley to control the flow or raise the level of water held within a catchment area. ... A weir is a steel or concrete barrier constructed across a river or creek that regulates water flow and allows water to be slowly released to users downstream.
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.
How do Weirs work?
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 the purpose of locks and weirs?
The weirs and their weir pools — the water stored behind the weir — provide bodies of water at higher levels than would otherwise be present. This allows water to be diverted for agricultural, domestic and industrial use. The weir pools and locks also enable recreational activities.
How do weirs stop flooding?
A weir is a small dam built across a body of water, such as a river. ... 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.
What is a Rock weir?
Rock weirs are very low structures that should be completely overtopped during channel-forming flow events (approximately a 1.5-year flow event). ... Both porous and solid rock weirs are-designed in a 'V' or 'U' shape with the trough oriented upstream (see attached figures). Each stream channel and project site is unique.
How do you escape a weir?
Water falls over the weir, drives to the bottom of the riverbed, bounces back up and then rejoins the downward flow at the top. These circulating stoppers can be aggressive and impossible to escape. You can try to swim down or sideways to and exit the circuit, and then rise to the surface.
What is a weir and why it is constructed?
A weir is a small dam built across a river to control the upstream water level. Weirs have been used for ages to control the flow of water in streams, rivers, and other water bodies. ... That means adding a weir across a river will increase the water level upstream.
What does the word weirs mean?
Definition of weir
(Entry 1 of 2) 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. Weir.
How do weir skimmers work?
Weir skimmers operate by taking the surface layer off the water. Oil flows into the central hopper where it's pumped to storage. ... The depth of the cut can be adjusted by varying the pumping rate. These affordable, high-capacity skimmers can skim any oil that will float and flow over the weir.
What is weir basket?
The weir basket catches all the debris that the weir skims from the pool surface as well as picked up by the pool cleaner. It protects the pool pump from large debris that can damage the pump.
Why do pool skimmers have two holes?
The skimmer sits at the waterline and catches leaves, bugs and trash so they do not clog the filter. Skimmers with a second hole help keep the pump from running dry if the water level is unstable.
