This question was previously asked in

GPSC AE CE 2018 Official Paper (Part B - Civil)

- 30°
- 60°
- 90°
- 120°

Option 3 : 90°

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CT 1: Ratio and Proportion

3742

10 Questions
16 Marks
30 Mins

__Concept:__

A V-notch weir is also called the triangular notch or weir. The discharge over a triangular weir or notch is given by,

\({\rm{Q\;}} = {\rm{\;}}\frac{8}{{15}}{{\rm{c}}_{\rm{d}}}\sqrt {2{\rm{g}}} \tan \frac{{\rm{θ }}}{2} \times {{\rm{H}}^{5/2}}\)

Where,

Q = Discharge, Cd = co-eff of discharge, H = Head above the bottom of the notch, and θ = Angle of the triangular notch

**∴ For maximum discharge, θ should be 90° so that, tan θ/2 = 1**

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