What does a weir do?
Weirs are commonly used to control the flow rates of rivers during periods of high discharge. Sluice gates (or in some cases the height of the weir crest) can be altered to increase or decrease the volume of water flowing downstream.
What is a notch and Weir?
Notches are openings which is used to measure discharge through it. However a Weir is a notch but in a very large scale. 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.
What is a weir in a tank?
18,100 gallon open top weir tanks from Rain for Rent come with over and under weirs for separation of oils or particulates. This tank has a standard "V" shaped floor for ease of draining all stored liquids completely through a 4" butterfly valve with Buna seals standard.
What is a Sutro Weir?
Definition of Weir : A type of small overflow dam that can be used for flow measurement. Definition of Sutro Weir : The discharge (flow) through the weir is proportional to the head (water depth above a reference plane located at one third of the depths of the crest of the base weir).
A weir is a small overflow-type dam commonly used to raise the level of a river or stream. Weirs have traditionally been used to create mill ponds in such places. Water flows over the top of a weir, although some weirs have sluice gates which release water at a level below the top of the weir.
What is the weir in the swimming 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.
What is a weir in a distillation column?
The function of a weir is to maintain a desired liquid level on the tray. Typical weir height is between 2 - 4 inches. Low weirs are frequently used in low pressure or vacuum columns. Notched (rectangular or V-shaped) weirs are commonly used for low liquid loads.
What is a broad crested weir?
Broad crested weirs are robust structures that are generally constructed from reinforced concrete and which usually span the full width of the channel. They are used to measure the discharge of rivers, and are much more suited for this purpose than the relatively flimsy sharp crested weirs.
What is a notch in fluid mechanics?
The bottom edge, over which the liquid flows, is known as sill or crest of the notch and the sheet of liquid flowing over a notch (or a weir) is known as nappe or vein. A notch is, usually made of a metallic plate and is used to measure the discharge of liquids.
What is the spillway of a dam?
A spillway is a structure used to provide the controlled release of flows from a dam or levee into a downstream area, typically the riverbed of the dammed river itself. In the United Kingdom they may be known as overflow channels. Spillways ensure that the water does not overflow and damage or destroy the dam.
What is the auxiliary spillway?
A spillway, usually located in a saddle or depression in the reservoir rim which leads to a natural or excavated waterway, located away from the dam which permits the planned release of excess flood flow beyond the capacity of the service spillway. The auxiliary spillway thus has only infrequent use.
What is the meaning of emergency spillway?
The crest is usually set at maximum water surface. A spillway that is designed to provide additional protection against overtopping of a dam and is intended for use under extreme conditions such as misoperation or malfunction of the service spillway or other emergency conditions.
What is a siphon spillway?
Siphon Spillway is a closed duct. Following points are to be kept in mind. 1. Hood level is higher than Reservoir level. Hence, when flowing full the water level in pipe is higher than the reservoir level.
What is meant by hydraulic jump?
A hydraulic jump is a phenomenon in the science of hydraulics which is frequently observed in open channel flow such as rivers and spillways. When liquid at high velocity discharges into a zone of lower velocity, a rather abrupt rise occurs in the liquid surface.
Why does a hydraulic jump occur?
A hydraulic jump occurs when the upstream flow is supercritical (F>1). To have a jump, there must be a flow impediment downstream. The downstream impediment could be a weir, a bridge abutment, a dam, or simply channel friction. Water depth increases during a hydraulic jump and energy is dissipated as turbulence.
What is an energy dissipator?
Energy dissipators are devices designed to protect downstream areas from erosion by reducing the velocity of flow to acceptable limits.
What is an energy dissipation device?
ENERGY DISSIPATION DEVICES – earthquake resistant design TECHNIQUE. The goal of energy dissipation devices, also called dampers is to dampen and dissipate the earthquake's energy as it enters the building; thereby stopping or reducing deformation/damage to the building.
What is a riprap apron?
Description. Riprap slope and outlet protection is created by an arranged layer or pile of. rock placed over the soil surface on slopes and at or below storm drain outfalls or temporary dikes. Riprap used as slope protection protects against erosion and dissipates the energy of runoff or surface water flow.
Updated: 2nd October 2019