fluid

Theory: A notch is a device used for measuring the rate of flow of a liquid through a small channel or a tank. The notch be defined as an opening in the side of a tank or a small channel in such a way that the liquid surface in the tank or channel is below the top edge of the opening. A weir is a concrete or masonary structure, placed in an open channel over which the flow occurs. It is generally in the form of vertical wall, with a sharp edge at the top, running all the way across the open channel. The notch is of small size while the weir is of a bigger size. The notch is generally made of metallic plate while weir is made of concrete or masonary structure. Classification of Notches Notches are classified according to the shape of opening as 1. Rectangular Notch 2. Triangular Notch 3. Trapezoidal Notch 4. Stepped Notch