## What is broad crested weir?

The broad crested weirs are a hydraulic structures widely used for depth control and flow measurement in field and laboratory canals . The geometry described as a flat-crested structure with a length (L) of crest large enough compared to the flow thickness over the crest of the weir.

**How does a weir measure flow?**

Weirs to Measure Flow It works by raising the water level upstream of the weir, and then forcing the water to spill over. The more water is flowing over the weir, the deeper the water will be upstream of the weir. So measuring flow rate (CFS) can be done by simply measuring the depth of the water upstream.

**What is the 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. For example, a weir coefficient (C) of 3.00 in English Units would be 1.66 in SI units.

### Does the length of weir affect the discharge coefficient?

Results indicated that by increasing the weir height, the discharge capacity increased. One type of long-crested weir is oblique weir. Oblique weirs are longer than standard weirs. Therefore, they can pass more discharge capacity than weirs at the given channel width.

**What is narrow crested weir?**

To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height.

**How do you distinguish sharp crested weir from a broad crested weir?**

- The sharp crested weir will help in measuring the discharge of the water from the small rivers and canals and the weir is placed in the direction of the flow of water.
- The broad crested weir is one which the water flow discharge in measured from large water bodies like big canals.

## What is the formula for the circumference of a circle?

Formula for circumference. The following equation describes the relation between the circumference and the radius R of a circle: C = 2πR. Where π is a constant approximately equal to 3.14159…

**How to calculate the circumference of a cylinder?**

Multiply the radius by 2 to get the diameter. Multiply the result by π, or 3.14 for an estimation. That’s it; you found the circumference of the cylinder. Or you can use the cylinder’s diameter:

**How to find the radius of a 10 cm circle?**

To find the radius of a circle with a circumference of 10 centimeters, you have to do the following: Divide the circumference by π, or 3.14 for an estimation. The result is the circle’s diameter, 3.18 centimeters. Divide the diameter by 2. And there you go, the radius of a circle with a circumference of 10 centimeters is 1.59 centimeters.

### What is the ratio of circumference to diameter?

You have probably noticed that, since diameter is twice the radius, the proportion between the circumference and the diameter is equal to π: C/D = 2πR / 2R = π. This proportion (circumference to diameter) is the definition of the constant pi.