The rate of flow over a broad crested weir is given by:
Choose the correct answer
Q = Cd × L × H (no power of 1.5)
Q = Cd × 1.705 × L × H^(3/2) (broad-crested, critical flow over crest)
Q = k × i (Darcy''s law)
Q = A × V (continuity only)
Correct Answer
B. Q = Cd × 1.705 × L × H^(3/2) (broad-crested, critical flow over crest)
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Broad-crested weir: Q = Cd × L × (2/3)^(3/2) × √(2g/3) × H^(3/2) = Cd × 1.705 × L × H^(3/2) approximately. Critical flow occurs over the crest (y = 2H/3 for rectangular). Cd for broad-crested weir ≈ 0.848. For sharp-crested (thin plate) weir: Q = (2/3) × Cd × √(2g) × L × H^(3/2) with Cd ≈ 0.62.
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