1 / 7

V-notch Sharp-crested weir

V-notch Sharp-crested weir. This type is used for small discharges. The weir has a V-notch as a control section. The angle Θ can take any value, the most common value is 90 o . To design or evaluate the discharge, the following equation is used,.

shaine-ashley
Download Presentation

V-notch Sharp-crested weir

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. V-notch Sharp-crested weir

  2. This type is used for small discharges.

  3. The weir has a V-notch as a control section. • The angle Θ can take any value, the most common value is 90o. • To design or evaluate the discharge, the following equation is used,

  4. The discharge coefficient is obtained from the following graph,

  5. To design the weir, a similar procedure to the one explained in the previous weir is used. • However in this case, the value of h1 is assumed and then obtained from the equation until convergence is obtained. • Also, if the characteristics of the weir are known, the discharge can be evaluated from the equation.

  6. Example: Design a V-notch sharp crested weir according to the following data; Q= 0.25 m3/sec, B=1 m, d= 0.8 m • Sol. Assume p1 = 0.4 m … h1=0.4 m h1/p1 = 1 …. b1/B = 0.4 From graph Ce= 0.598 Apply the equation ….. h1= 0.5 m

  7. p1= 0.8 – 0.5 = 0.3 m h1/p1 = 1.67 …. b1/B = 0.3 From graph Ce= 0.614 Apply the equation ….. h1= 0.495 m close …. P1 = 0.3 m

More Related