The head loss due to sudden expansion is given by (with usual notations)

1
\(\frac{{{{({v_1} - {v_2})}^2}}}{{2g}}\)
2
\(\frac{{{v_1}^2 - {v_2}^2}}{{2g}}\)
3
\(\left( {\frac{{{v_1} - {v_2}}}{{2g}}} \right)\)
4
\(\frac{{{{({v_1} - {v_2})}^2}}}{g}\)

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