Three specific locations (identified in Figure 6-3 by the red dots) and the conditions under which they are inundated have been included in Table 6-2. Properties north of the creek, but south of Blackgate Road are likely to be affected under a 1% AEP event with 0.5 m of sea-level rise. The Horwood Drive area south of the creek is an area of higher topography than areas north of the creek. This area is only likely to inundate under a 1% AEP event with 1.4 m of sea-level rise. This will affect access to the properties along Horwood Drive and potentially some of the lower lying properties.

Table 6-2     Critical inundation locations identified in the Breamlea model

The main erosion hazard in this compartment is the beach access track at Bancoora Beach. At present the elevation of the dune in this location is enough to limit coastal inundation during storm events. Recent core samples show that the unconsolidated sediment in this area is able to erode to a depth approximately 4 m below present elevation (which ranges from 4.1 - 4.4 m AHD). With increases in sea-level rise greater than 0.5 m, the erosion here is likely to be sufficient to erode the beach back far enough that, under a 1% AEP event, water may overwash the dune at the low section, and inundate the hinterland. Further investigation is required to examine the results of the core sampling and hence the susceptibility of the dune to erosion, especially when coupled with the incidence of riverine flooding. Increases in foot traffic using this beach access will also need to be considered as this will increase the anthropogenic induced erosion in this area. The management triggers are presented in Table 6-3.

Table 6-3     Inundation triggers - Thompson Creek to Blue Rocks