
This section deals with modelling the damage to infrastructure as a result
of the inundation described in the previous sections. 
The National Building Exposure Database (NBED) has been
created by Geoscience Australia so that consistent risk assessments for a range
of natural hazards can be conducted 
\footnote{http://www.ga.gov.au/urban/projects/ramp/NBED.jsp}. 
The NBED contains information
about buildings, people, infrastructure, structure value and building contents.
It is important to note here that the NBED contains information about
residential structures only. From this database, we find that there
are 13425 residential structures and a population of approximately 41850
in Pt Hedland \footnote{Population is determined by census data and an 
ABS housing survey).

Once the maximum inundation is calculated for each building, the resultant 
damage 
can then be determined as a function of its type and location from the 
coastline, \ref{ken:damage}.

Impact on indigeneous communities are important considerations when determining
tsunami impact, especially as a number of communities exist in coastal regions.
These communities are typcially not included in national residential 
databases and
would be therefore overlooked in damage model estimates. 
There are four indigeneous communities located in this study area as seen
in \ref{fig:communities}. The community located in a potentially vulnerable 
position
(on the headland) is Tjalka Boorda whose population is not registered.

\begin{figure}[hbt]

  \centerline{ \includegraphics[width=100mm, height=75mm]{../report_figures/pt_hedland_communities.png}}

  \caption{Location of indigeneous communities in study area.}
  \label{fig:communities}
\end{figure}

\begin{center}
\begin{tabular}{|l|l|l|}\hline
Easting	 & Northing	& Community	& Population \\ \hline
677055.8541&	7742819.31&	 Tjalkli Warra&	100 \\ \hline
690756.9171&	7746148.981&	 Jinparinya&	30 \\ \hline
691091.3867&	7747119.611&	 Punju Ngarugundi Njamal&	22 \\ \hline
669526.1521&    7752820.507& Tjalka Boorda	& 0 \\ \hline
\end{tabular}
\end{center}