Bushfire Hazard Assessment

                                                                                           BHA Report for36 Riverpark Drive, Ringtail Creek




Vegetation

The Australian bush varies greatly around the country. There are regions of open woodlands, grassland savannas, dense
rainforest. Different types of vegetation burn differently. Generally, fuel is classified as being fine (grasses and twigs that are
less than 6 millimetres in diameter) or heavy (branches, logs or stumps). Finer fuels burn more easily, increasing the spread of
the fire. Another key factor is fuel moisture content, or how dry the fuel is. The drier the fuel, the more easily it will burn. The
dryness of the fuel depends on seasonal rainfall and temperatures.



Topography

Fires burn faster uphill. This is due to the radiation and convection a fire creates preheating the fuel. A 10-degree increase in
slope results in a doubling of the speed of the fire. Fire will spread up a 10-degree slope two times as fast as it will along flat
ground (Figure 6). The aspect of a slope (direction that a sloping piece of land is facing) influences a fire's behaviour. Northern
and western aspects receive more direct heat from the sun, drying both the soil and the vegetation more than on southern or
eastern slopes. The fuels on northern and western aspects are often drier and less dense than fuels on slopes with a different
aspect.




                                                            Figure 6


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