Privacy Policy 9. We know the discharge over a rectangular weir is given by –, The discharge over the weir as per this formula is given by –, We know for a rectangular weir with the two end contractions, the discharge is given by –. Now a more accurate value of the discharge is calculated from the above equation. Learn how your comment data is processed. The consequent weir formed is shown in Fig. We hav... Hello once again We have discussed in previous post about  causes of hydraulic system overheating  , cost of hydraulic oil leaks  and &q... in the subject of fluid mechanics in our recent In some cases there may be intermediate obstacles like piers over the weir. According to the shape of opening, notches can be classified as, 5.2. box. Consider the weir shown in Fig. Please write in comment We know for a rectangular notch of length I the discharge over the notch is given by. We were discussing the “ Elongation of uniformly tapering circular rod ” and “ Elongation of uniformly tapering rectangular rod ” and also... We will discuss here the difference between positive and non-positive displacement pump with the help of this post. The rate of flow can be determined by measuring the height of the upstream water level. Terms of Service 7. Let H be the head of water over the weir. Hence the discharge over the weir will be –. The layer of fluid flowing above the weir or below the notch is known as Nappe (or Vain). Now we will go ahead to find out the classifications 6.1. Content Filtration 6. In some cases these sluice gates are operated by a crane. Plagiarism Prevention 5. The head ha is called the head due to the velocity of approach. Huge Collection of Essays, Research Papers and Articles on Business Management shared by visitors and users like you. Trapezoidal weir (Cipolletti Weir) Advantages of a Triangular Notch over Rectangular Notch: A triangular notch has certain advantages over the rectangular notch when used as a gauging device in a hydraulic laboratory. These terms are, Now we can move our discussion further on the, Notch without end contraction or suppressed notch, Used to regulate discharge of small channels, Used to regulate discharge of large channels, like canals and rivers. Classification or Types of Notches and Weirs in Fluid Mechanics. Let the heads on the weirs be H and h. Let discharge Q and q over them are given by –. Let it be required to find the time taken for the head of water over the notch to fall from a value H1 to a value H2. Water flows over a notch or weir while water passes through an orifice. Time of Emptying a Reservoir by a Rectangular Weir: Let a reservoir of plan area A be provided with a rectangular weir of length I. The total discharge Q consists of components Q1 and Q2. of rivers or large canals. But for the same discharge over the triangular notch the head will be greater and the clinging nappe will be avoided. (i) The coefficient of discharge for a triangular notch is practically independent of the head. Moreover, a notch is usually made in a plate, whereas a … This process may be repeated to get more accurate value of the discharge. In this article we will have discussion on Notches and Weirs. A weir will be basically made by a concrete or masonary structure. In this article we will have discussion on, A notch is a kind of opening (throughout the width) to the fluid flow, in which fluid flows through the bottom of notch. It is used to regulate the, A notch is generally made up of a metal plate and is used to, Before moving further in our discussion on notches and weirs let us first understand two important terms, which will help us in understanding types of both. As the water flows over the weir, it reaches a uniform depth of flow h, over the crest. In this case the notch may be taken to consist of a rectangular notch of length l and a triangular notch subtending an angle 2θ. Fig. Fig. A notch is a kind of opening (throughout the width) to the fluid flow, in which fluid flows through the bottom of notch. In this way it reaches a maximum rise of 0.115 H’ above the crest and then falls. Weirs can be classified on the basis of shape of opening, on the basis shape of Crest (or Sill) and on the basis of effects of sides on the Nappe (or Vein). This is a weir having a very broad sill so that the flow of water over the sill may be compared to the flow of water in a channel. When the discharge is moderate, the water drops over the lip C into a culvert D which communicates with the supply channel. They can be classified into sharp crested and broad-crested weirs based on the sharpness of the crest.

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