Kenlynn Castaways Beach BMP

The Bushfire Attack Level (BAL) implications of each of these fire scenarios is shown in the bottom row of Table
6.

The Radiant Heat Flux curves for these worst case design fires are plotted in Figure 14.




   Figure 14. Radiant Heat Flux Predicted by Method 2 under AS3959 – 2009, compared to Method 1.


   Site specific Method 2 analysis demonstrates lesser setbacks to be viable than Method 1 and therefore the
   need to disturb or remove vegetation within an environmental protection area is less. In the process a degree
   of risk is created, based on the levels of redundancy remaining in the assumptions used and calculations
   performed. The author believes the level of risk in this instance is acceptable, The design fires are either
   restarts, have a short fire run length or may be backing fires. The protection of the dune complex demands
   retention of vegetation that is stabilising the dunes where possible.

   With a 12m (minimum) setback between dwellings and unmanaged fuel Areas 2, 3 and 4, BAL 29
   construction is shown to be viable under Method 2 of AS3959-2009. With a minimum setback of 10m
   between the dwelling on Lot 2 and unmanaged fuel Area 1, BAL 29 is viable. (It could be argued that this
   setback could be reduced to 9m, but this is not advisable due to the lack of redundancy if predicted variables
   are exceeded).

   Any other structures built within 6m of the residential building shall also comply with AS3959-2009
   construction requirements.

   Report compiled by Bushfire Risk Reducers for Kenlynn Pty Ltd, August 2016                Page 19