Large rectangular orifice: discharge formula in terms of heads H₁ and H₂ For a large rectangular orifice of breadth b with liquid heads H₁ (above top) and H₂ (above bottom), pick the correct discharge equation (C_d is coefficient of discharge). Choose the correct expression.

Difficulty: Medium

• Q = Cd × b √(2g) × (H2 − H1)
• Q = Cd × b √(2g) × (H2^{1/2} − H1^{1/2})
• Q = Cd × b √(2g) × (H2^{3/2} − H1^{3/2})
• Q = Cd × b √(2g) × (H2^{2} − H1^{2})