what is weir and list down its different types used in our experimental work

Weir is a type of structure used in fluid mechanics to measure the flow rate of liquids in open channels. There are different types of weirs used in experimental work, including:

1. Rectangular Weir: This type of weir has a rectangular shape and is commonly used to measure flow rates in small channels.

2. V-Notch Weir: This type of weir has a triangular shape with a V-shaped notch at the center. It is commonly used to measure low flow rates.

3. Cipolletti Weir: This type of weir has a trapezoidal shape and is commonly used to measure flow rates in large channels.

4. Broad-Crested Weir: This type of weir has a flat crest and is commonly used to measure flow rates in wide channels.

5. Ogee Weir: This type of weir has a curved shape with a sharp crest and is commonly used to measure high flow rates.

6. Compound Weir: This type of weir is a combination of two or more weirs and is commonly used to measure flow rates in complex channels