A rectangular notch of width L discharging water under head H has discharge Q =:
Choose the correct answer
Q = Cd × L × H
Q = (2/3) × Cd × L × √(2g) × H^(3/2) ≈ 1.84CdLH^(3/2)
Q = L × H²
Q = Cd × L × H^2
Correct Answer
B. Q = (2/3) × Cd × L × √(2g) × H^(3/2) ≈ 1.84CdLH^(3/2)
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Rectangular notch: Q = (2/3) × Cd × L × √(2g) × H^(3/2) ≈ 1.84 × Cd × L × H^(3/2). Cd ≈ 0.62 for sharp-crested. L must be corrected for end contractions if not suppressed: L_eff = L − 0.1nH (n = number of end contractions, 0–2). Francis formula (n=2): Q = 1.84(L − 0.1nH)H^(3/2).
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