\chapter{Uplift calculation}\label{sec:UpliftCalculation}

\ProgramName makes calculations to see whether there is any uplift from the inner toe to the centre of the ditch bottom or to the right limit of the geometry if there is no ditch.\newline
The formula from the VTV (2006) is used for this purpose. 
\begin{equation}
\label{eq_opdrukveiligheid}
	Uplift safety = \frac{\sigma_g}{\sigma_w}
\end{equation}

The check for uplift is done at every surface line point from the characteristic point DikeToeAtPolder to the centre of the ditch  bottom or to the characteristic point SurfaceLevelInside (from left to right).

The check for uplift has the following purposes:
\begin{itemize}
	\item To decide if a LiftVan calculation is required, see \autoref{sec:CombinationBishopUpliftVan}.
	\item To generate the piezometric levels, see \autoref{sec:CheckUplift}\newline
\end{itemize}

