A triangular notch with an apex angle of 60 degrees is used to measure the flow rate. The head of water above the apex is 0.2 meters. Calculate the discharge over the notch

9. A triangular notch with an apex angle of 60 degrees is used to measure the flow rate. The head of water above the apex is 0.2 meters. Calculate the discharge over the notch.

0.0132 m³/s
0.0264 m³/s
0.0528 m³/s
0.0792 m³/s

Answer: B) 0.0264 m³/s

Explanation:

The formula for discharge over a triangular notch is given by:

Q=1.42×b×h5/2
Where:
Q = Discharge
b = Base width of the notch
h = Head of water above the apex
Given that the apex angle is 60 degrees, the base width is
b=2×htan(30∘).
Plugging in the values:
b=2×0.2×tan(30∘)≈0.2309 m
Q=1.42×0.2309×0.25/2
≈0.0264 m³/s

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