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Why is the height of point 2 same as point 3?

1. Homework Statement
upload_2017-10-27_4-15-19.png

2. Homework Equations
upload_2017-10-27_4-15-40.png


3. The Attempt at a Solution
Is it an assumption because the difference in height is small?
 

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With a setup as shown height differences within the turbine are very small.
For smaller height differences, other types of turbines are used.
 
I wonder why it didnt use "≈", thank you!
 

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