The head loss due to sudden expansion is expressed by
1
\(\frac{{V_1^2 - V_2^2}}{{2g}}\)
2
\({\left( {\frac{{{V_1} - {V_2}}}{{2g}}} \right)^2}\)
3
\(\frac{{{{\left( {{V_1} - {V_2}} \right)}^2}}}{g}\)
4
\(\frac{{{{\left( {{V_1} - {V_2}} \right)}^2}}}{{2g}}\)