Broad crested weir equation

What is the Weir equation?

The Weir formula is a formula used in indirect calorimetry, relating metabolic rate to oxygen consumption and carbon dioxide production. According to original source, it says: Metabolic rate (kcal per day) = 1440 (3.94 VO2 + 1.11 VCO2)

How do you calculate flow through a weir?

The equation recommended by the Bureau of Reclamation in their Water Measurement Manual, for use with a suppressed rectangular weir is: Q = 3.33 B H3/2, where Q is the water flow rate in ft3/sec, B is the length of the weir (and the channel width) in ft, and H is the head over the weir in ft.

What is a weir coefficient?

The weir coefficient (as shown above in the weir equation) is a lumped parameter that includes the discharge coefficient, the gravitational constant, and constants based on geometric properties. The discharge coefficient is dimensionless and therefore it is the same in both English (U.S. Customary) Units and SI Units.

Why is it necessary to calibrate a broad crested weir?

Calibration of each weir based on field measurements was necessary to compensate for required compromises in weir design. Accurate measurement of stream flow is an important component of environmental water quality monitoring. Flow rates in small streams can be conveniently monitored using weirs.

What is Francis formula?

[′fran·səs ‚fȯr·myə·lə] (fluid mechanics) An equation for the calculation of water flow rate over a rectangular weir in terms of length and head.

What is Weir length?

The Length is the bottom width of the weir. The height is measured from the bottom of the weir opening to the top of the water level ponded behind the weir (not the water level right as it leaves the weir).

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 are the different types of Weir?

Weirs are classified according to:Types of Weirs based on Shape of the Opening. Rectangular weir. Triangular weir. Trapezoidal weir.Types of Weirs based on Shape of the Crest. Sharp-crested weir. Broad- crested weir. Narrow-crested weir. Ogee-shaped weir.Types of weirs based on Effect of the sides on the emerging nappe.

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How does Weir 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. In a weir, the surface over which the water flows is known as the crest.

Why do we use Weir?

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.

Why are weirs so dangerous?

A weir is a large wall that holds back water in the river so it can be slowly released downstream. Why are weirs dangerous? After heavy rain, an overflowing weir can become a drowning machine due to the volume of water flowing over the person underwater, making self-rescue, and even assisted rescue, almost impossible.

What does Weir mean?

(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.

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