ATTCH 2 - IR Response - Ecological and Bushfire IR Response (Cardno)

                                                                                                      Bushfire Management Plan
                                                                                          Lot 71 on MCH 2854, Castaways Beach



The building setbacks required to achieve each of the AS3959 (2009) BAL standards are summarised in Table
5-1.

Table 5-1     Bushfire Attack Level Setback Assessment – Bushfire Prone Areas


                                                                                           Minimum Building Setback
     AS3959 (2009)
                             Risk description as per AS3959 (2009)                              Required (m)
     BAL Category



            Low              The risk is considered to be VERY LOW.                                     100

                             There is insufficient risk to warrant any specific
                             construction requirements under AS3959.


            12.5             The risk is considered to be LOW.                                           34
                             There is a risk of ember attack.

                             Construction elements are expected to be exposed to a
                             heat flux not greater than 12.5 kW/m2.


            19               The risk is considered to be MODERATE.                                      24
                             There is a risk of ember attack and burning debris
                             ignited by wind borne embers and a likelihood of
                             exposure to radiant heat.

                             Construction elements are expected to be exposed to a
                             heat flux not greater than 19 kW/m2.


            29               The risk is considered to be HIGH.                                          16
                             There is an increased risk of ember attack and burning
                             debris ignited by wind borne embers and a likelihood of
                             exposure to an increased level of radiant heat.

                             The construction elements are expected to be exposed
                             to a heat flux not greater than 29 kW/m2.


            40               The risk is considered to be VERY HIGH.                                     12
                             There is a much increased risk of ember attack and
                             burning debris ignited by windborne embers, a
                             likelihood of exposure to a high level of radiant heat and
                             some likelihood of direct exposure to flames from the
                             fire front.

                             The construction elements are expected to be exposed
                             to a heat flux not greater than 40 kW/m2.


    Flame Zone - FZ          The risk is considered to be EXTREME.                                      < 12
                             There is an extremely high risk of ember attack and
                             burning debris ignited by windborne embers, and a
                             likelihood of exposure to an extreme level of radiant
                             heat and direct exposure to flames from the fire front.

                             The construction elements are expected to be exposed
                             to a heat flux greater than 40 kW/m2.


Each of the proposed Lots has a defined Building Envelope as shown in Drawing Ref WE17035-BAR-001
presented in Appendix D. The nearest of these Building Envelopes to designated Bushfire Hazard Areas is



WE17035 | 13 November 2017
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