{latex}
\large
\[
\begin{gathered}
  A_{orifice} (h_{orifice} ,K_{orifice} ,Q) = \frac{Q}
{{K_{orifice} \sqrt {2gh_{orifice} } }} \hfill \\
  h_{orifice} (D,K_{orifice} ,Q) = \left( {\frac{Q}
{{K_{orifice} A_{orifice} D}}} \right)^2 \frac{1}
{{2g}} \hfill \\ 
\end{gathered} 
\]


{latex}