Approved Plan - RAL21-0008

5.2       Numbers of people likely to be present

The proposed development makes no significant difference to the number of people living in the area or
potentially exposed to the possibility of unplanned fire, and the design of the development serves to protect
life and property, and facilitate access and egress, in so far as is reasonably possible.




6.0 Nature and Severity of Potential Bushfire Attack
6.1       Bushfire season and Fire Weather

The “typical fire season” in this area peaks between September and November. The predominant winds in the
area are south easterly, however during the fire season, hot gusty westerlies of over 30 kph can be expected,
with Relative Humidity falling to 15% and less. Temperatures on these days can climb over 35⁰C , and for two
or three days a year, fire weather conditions equivalent to FDI levels of around 50 can be anticipated. (Note
that this is in contrast to the value of 40 which Queensland is currently using in the recently revised AS3959 -
2018).




Figure 7. State Government revised FDI values to FDI 50 for the area involved. (CSIRO, 2014).

6.2       Anticipated direction of bushfire attack

The probability of unplanned “wildfire” attack is currently regarded as possible, or even likely. The potential
direction of attack is from the west, aligned with the direction of worst case fire weather for the region.

Bushfire attack comes in a number of forms: direct flame, radiant heat, embers, smoke and wind. Research
shows that over 80% of houses lost to bushfire in Australia can be attributed to ember attack, within 100m of
bushland.




Report compiled by Bushfire Risk Reducers for Mr K. Courtney, January 2021                  Page 13