The discharge through a Venturimeter installed in a pipe is proportional to:
ADifferential pressure head (h)
BSquare root of differential pressure head (sqrt(h))
CSquare of differential pressure head (h^2)
DCube root of differential pressure head (h^(1/3))
Explanation
Venturimeter discharge formula is Q = [Cd * A1 * A2 / sqrt(A1^2 – A2^2)] * sqrt(2gh). Thus, discharge Q is directly proportional to sqrt(h).

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