Bushfire Hazard Assessment & Management Plan v1 - 9A Jirrima Cres, Cooroibah

Bushfire Hazard Assessment & Management Plan v1                                    NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah



high potential bushfire intensity area by a distance that achieves a radiant heat flux level of 29
kilowatt per square metre or less .
Compliance with Assessment Benchmark 4 can be attained where the proposed Lot 1 building
envelope is sufficiently separated from the nearby forest hazard so that a radiant heat flux
level at any point on the building envelope does not exceed 29 kW/m². In this instance the
plan of development identifies a building envelope for Lot 1. The setbacks required to satisfy
Assessment Benchmark 4 are defined in Section 5.2.3.
5.2.3     Radiant Heat Flux Setbacks
Determination of the setbacks required to satisfy Assessment Benchmark 4 can be identified
from the quantitative modelling output presented in Section 3.3 herein. The output results from
Plate 10 can be used to identify the setback requirements to achieve the <29 kW/m² radiant
heat flux SPP requirement. The required setbacks are shown in Table 4.
          Table 4 – Radiant Heat Flux Minimum Setbacks to secure <29kW/m² (Lot 1 BLE)
           VHC                          Direction and slope (º)         <29 kW/m² Setback* (m)

            22.1                                   North (1°)                       14

            22.1                                   East (1°)                        14

            22.1                                   South (1°)                       14

            22.1                                   West (1°)                        14

* Source – Flamesol Minimum Distance calculator

Table 4 identifies a minimum setback of 14m is required to expose the Lot 1 BLE flanking
hazardous VHC 22.1 vegetation to <29 kW/m² radiant heat. It is therefore recommended
minimum APZ’s of 14m depth be provided between the limit of the Lot 1 BLE and flanking
hazardous VHC 22.1 vegetation and that the setbacks be wholly provided within Lot 1 and be
maintained for the life of the development.
The plan of development identifies the recommended 14m setback hence satisfies
Assessment Benchmark 4.
All APZ’s should be maintained as described in Section 5.6 herein.

5.3 Water Supply
The availability of a reliable water supply for firefighting purposes is a vital tool in the defence
of bushfire impact. The site is not connected to a reticulated water supply. For the purposes
of incorporating the most up to date QFES water supply recommendations, it is recommended
the development adopts the relevant provisions stated in Assessment Benchmark 4 of the
SPP December 2019 guidance material and subsequently Section 9.1 in the QFES Bushfire
Resilient Communities document. In this regard, Assessment Benchmark 4 requires:
To ensure emergency services can respond effectively, development is located within a
reticulated water supply area or includes a dedicated static water supply that is available solely
for fire-fighting purposes and can be accessed by fire-fighting vehicles15.
Footnote 15 states: Information regarding appropriate static water supply can be found in the
Bushfire Resilient Communities document.
Section 9.1 in Bushfire Resilient Communities requires a static water supply as follows:
         Where reticulated water supply is not available, development provides a water tank that
         is available solely for fire-fighting purposes and can be accessed by fire-fighting
         appliances. A water tank is to be provided within 10 metres of each building (other than
         a class 10 building) which:
         a) is either below ground level or of non-flammable construction
         b) has a take-off connection at a level that allows the following dedicated, static water



© 2020                                                          21