'Francis'' formula' for a rectangular notch including end contractions is:
Choose the correct answer
Q = 1.84LH^(5/2) (wrong exponent)
Q = 1.84(L - 0.1nH)H^(3/2) where n = number of end contractions (0 or 2)
Q = 1.84LH^(1/2) only
Q = Cd×L×H without specific coefficient
Correct Answer
B. Q = 1.84(L - 0.1nH)H^(3/2) where n = number of end contractions (0 or 2)
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Francis formula (with n end contractions): Q = 1.84(L - 0.1nH)H^(3/2) where n = number of end contractions (0 for suppressed, 2 for both ends contracted). The term 0.1nH accounts for contracted effective length. For suppressed (no contractions, n=0): Q = 1.84LH^(3/2). Used in practice for field measurement of river/canal flow.
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