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The acausal bond graph of system \textbf{Weir} is
displayed in Figure \Ref{Weir_abg} and its label
file is listed in Section \Ref{sec:Weir_lbl}.
The subsystems are listed in Section \Ref{sec:Weir_sub}.
The weir is modelled by an \textbf{ISW} component in series with an
\textbf{R} component. Physicaly, the former represents the inertia of
the fluid together with the switching effect of the weir; the latter
represents the flow resistance.
The switching logic is on if the level on either side of the weir
reaches the level of the weir.