Aeration holes are provided to reduce the inside saturation pressure ____________________?
Correct answer: B. In a suppressed weir
- A. In a weir with end contractions
- B. In a suppressed weir
- C. In a cippoletti weir
- D. In all weir
Explanation
Aeration holes admit air beneath the nappe of a suppressed weir, preventing excessive sub-atmospheric pressure and nappe sticking. The other listed weir types are not the intended standard answer here.
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Practise Irrigation and Water Management
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