Fluid Mechanics Open Channel Flow Weirs and Notches

Calculate the theoretical velocity of the jet at vena contracta of an orifice if the head water over the orifice is 20 m. Consider the acceleration due to gravity to be 10 m/s2. 

1
10 m/s
2
25 m/s
3
12.5 m/s
4
20 m/s

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