Pitot tube measurements in a 5-ft-diameter water tunnel indicate that the stagnation pressure and the static pressure

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Pitot tube measurements in a 5-ft-diameter water tunnel indicate that the stagnation pressure and the static pressure differ by a mercury column height of 5.65 inches. What is the water velocity? Estimate the discharge in the tunnel. Why is it just an estimate? 
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Fundamentals Of Hydraulic Engineering Systems

ISBN: 978-0136016380

4th Edition

Authors: Robert J. Houghtalen, A. Osman H. Akan, Ned H. C. Hwang

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