Question
Download Solution PDFWhich notch gives the accurate result in measuring low discharge?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Weir or notch is a physical structure of masonry constructed across the channel width to calculate the discharge of the channel section.
Rectangular Notch:
The discharge through a rectangular notch weir is,
Where, Q = discharge of fluid, Cd = Coefficient of discharge, and H = height of water above the notch
Triangular Notch:
A V-notch weir is also called the triangular notch or weir. The discharge over a triangular weir or notch is given by the:
Where, Q = discharge of fluid, Cd = Coefficient of discharge, θ = Notch angle, and H = height of water above the notch
A triangular notch or weir is preferred to a rectangular weir or notch due to the following reasons:
- The expression for discharge for a right-angled V-notch or weir is very simple.
- For measuring the low discharge, a triangular notch gives more accurate results than a rectangular.
- In the case of the triangular notch, only one reading i.e H is required for the computation of discharge.
Last updated on Aug 1, 2024
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