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If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is

Q = 1.71 BD1/2
Q = 1.71 BD
Q = 1.71 BD3/2
Q = 1/71 BD2/3
none of these.

Correct Answer: Q = 1.71 BD3/2

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