The detailed hydrodynamic modelling was carried using SOBEK. Grids were set up for the four key inundation risk locations as shown in Table 5-2 and Figure 5-1, with the grid size of each modelled area. Note, the smaller the grid size, the more detailed the model.

Table 5-2     SOBEK modelling locations and model grid sizes

Figure 5-2     Study Area Compartments and SOBEK modelling locations

An assessment of the structures within each modelled area was undertaken prior to set up of the models to decide which were relevant to be incorporated. The majority of the protection structures identified were low retaining walls or revetments on the estuary shores, therefore these were incorporated as topographic features rather than formal structures (and where appropriate, additional roughness was added). Significant shore-protection structures were incorporated as structures in the model where inclusion as a topographic feature was not appropriate e.g. the Barwon levee. These were then checked for elevation against survey data and the LiDAR. Other structures that were necessary to be incorporated were the culverts, pipes and drains. These are to ensure water is transmitted through areas where topographical features may form a barrier in the model.