calculating loss in pipe vs Q

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ketanco

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IN the 13th edition of practice problems for civil engineering PE exam, on page 17-15, why is there a 1/2 in the formula, where it says:

"to calculate a loss for any other flow in the upper branch"

Ef upper 2 = Ef upper (.....) in that paranthesis

i didnt understand why there is a 1/2 in the denominator

 
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