The 'sluice gate' (vertical slide gate) for flood control under water is analysed using:
Choose the correct answer
Weir formula Q = 1.84LH^(3/2)
Orifice formula Q = Cd×b×a×√(2gH) — underflow gate acts as large orifice with vena contracta
Manning''s formula for pipe flow
Reynolds number for turbulence criterion
Correct Answer
B. Orifice formula Q = Cd×b×a×√(2gH) — underflow gate acts as large orifice with vena contracta
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Sluice gate (underflow gate): if discharging freely (not submerged), Q = Cd×b×a×√(2gH) where H = upstream head, a = gate opening, Cd ≈ 0.61 (accounts for vena contracta Cc=0.61 and velocity coefficient Cv≈1.0). For submerged: apply submergence correction. Orifice formula (V=Cd√(2gH)) applies because gate acts as large orifice.
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