BAL report 56 Reserve St Pomona - Bushfire Attack Level - Minimum Distance Assessment

         Wollemi Eco-Logical
          Environmental Project Management | Bushfire Assessment | Vegetation Management



The construction standards are intended to improve the performance of buildings subjected to
burning debris, radiant heat or flame contact. The AS3959- 2018 methodology prescribes Bushfire
Attack Levels (BAL’s) to the facades of proposed buildings to which corresponding construction safety
standards are applied. AS3959-2018 defines Bushfire Attack Levels as:

        ‘A means of measuring the severity of a building’s potential exposure to ember attack, radiant
        heat and direct flame contact, using increments of radiant heat expressed in kilowatts per
        metre squared, which is the basis for establishing the requirements for construction to improve
        protection of building elements from attack by bushfire.’

In accordance with the Australian Standard – Construction of Buildings in Bushfire-prone Areas (AS
3959, 2018), an assessment of the Minimum Distance Setback Requirements for individual BAL ratings,
has been undertaken to inform construction standards for the proposed development based on the
potential Bushfire Hazard adjacent the proposed development location (Table 1).

This assessment has been based on the following assumptions:
     ▪  A Fire Danger Index (FDI) of 47 (QFES 2022);
    ▪   Proposed development will be located in the layout as represented in Figure 2.
    ▪   Fuel load calculations (Method 2 BAL) for potentially hazardous vegetation to the south and
        east has been determined as reflective of ‘Class 16.1 Eucalyptus dominated forest on drainage
        lines and alluvial plains’ with 18t/ha fuel load potential.
    ▪   Setbacks distances for the proposed development from adjacent potentially hazardous
        vegetation, are understood to be determined based on this and other assessments.
    Additional parameters, including slope, used to determine the minimum distances for relative
    BAL ratings are detailed in the following Tables.
        Table 1: BAL Minimum Distance - Hazardous Vegetation to the East through South to West




    20 April 2022                           56 Reserve St Pomona –BAL Minimum Distance Assessment   Page 6
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