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Bushfire Hazard Assessment & Management Plan v1 - 60 Glenridge Drive COOROIBAH
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Log in to see the plans as drawnBUSHFIRE HAZARD ASSESSMENT AND MANAGEMENT
PLAN v1
LOT 47 ON RP860577
60 GLENRIDGE ROAD
COOROIBAH
FOR
MARK BAIN CONSTRUCTIONS
DECEMBER 2021
PO Box 9566 Pacific Paradise QLD 4564 / Email: [email protected]
ABN 60 625 108 625
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Full text of sections 2 to 36 (of 45)
Section 2
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
DOCUMENT CONTROL
Document: Bushfire Hazard Assessment & Management Plan
Client: Mark Bain Constructions
Project Number: J001001
Project: Reconfiguration of a Lot
Site: Lot 47 on RP806577
60 Glenridge Drive, Cooroibah
File Ref: C:\CLIENTS\MARK BAIN CONSTRUCTIONS\60 Glenridge Drive,
Cooroibah\04_REPORTING\Bushfire Hazard Assessment & Management Plan v1 –
60 Glenridge Drive, Cooroibah.docx
Version Date Distribution Author/s Approved
1 23/12/2021 Jack Lewis – Pivotal J. Isaacs (B. Env Sc.) Joshua Lee
Perspective Environmental Scientist; (B. Sc. AES, mEIANZ)
Mark Bain – Mark Bain Joshua Lee - Director
Constructions (B. Sc. AES, mEIANZ,
mFPA, mESA)
- Director
DISCLAIMER
To the extent permitted by law, North Coast Environmental Services (including its employees, partners and consultants) excludes
all liability to any person for any consequences, including but not limited to all losses, damages, costs, expenses, and any other
compensation, arising directly or indirectly, from using this publication (in part or whole) and any information or material contained
in it.
© 2021 i
Section 3
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
Contents
1 INTRODUCTION 4
1.1 BACKGROUND 4
1.2 STATE PLANNING POLICY BUSHFIRE INTENSITY OVERLAY MAP 4
1.3 DEVELOPMENT PROPOSAL 4
2 SITE DESCRIPTION 5
2.1 GENERAL 5
2.2 TOPOGRAPHY 5
2.3 VEGETATION WITHIN THE SITE 6
2.4 VEGETATION EXTERNAL OF THE SITE 6
3 HAZARD ASSESSMENT 8
3.1 HAZARD ASSESSMENT METHODOLOGY 8
3.1.1 LOCAL HAZARD AREA MAP 8
3.2 VEGETATION HAZARD CLASSES 9
3.2.1 VEGETATION HAZARD CLASS 22.1 – MELALEUCA OPEN FORESTS ON SEASONALLY INUNDATED
LOWLAND COASTAL SWAMPS 9
3.2.2 VEGETATION HAZARD CLASS 39.2 – LOW TO MODERATE TREE COVER IN BUILT UP AREAS 9
3.2.3 VEGETATION HAZARD CLASS 40.4 – CONTINUOUS LOW GRASS OR TREE COVER IN BUILT UP AREAS
10
3.3 POTENTIAL BUSHFIRE INTENSITY CLASSES 12
3.4 BUSHFIRE HAZARD SUB-UNITS 12
3.5 OVERALL LOCAL HAZARD MAP 12
3.6 QUANTITATIVE MODELLING 15
4 BUSHFIRE RISK ASSESSMENT 17
4.1 GENERAL 17
4.2 RISK FROM IDENTIFIED HAZARDOUS VEGETATION 18
5 BUSHFIRE IMPACT REDUCTION MEASURES 19
5.1 GENERAL 19
5.2 ASSET PROTECTION ZONES 19
5.2.1 GENERAL 19
5.3 WATER SUPPLY 20
5.4 FIRE BREAKS 21
5.5 VEHICULAR ACCESS 22
5.6 LANDSCAPING AND REGROWTH 22
5.7 GENERAL PROPERTY MAINTENANCE 23
6 AUSTRALIAN STANDARD 3959:2018 CONSTRUCTION OF BUILDINGS IN
BUSHFIRE PRONE AREAS (AS 3959:2018) SETBACKS 24
7 LEGISLATION AND OVERLAYS 25
7.1 NOOSA PLAN 2020 – NATURAL HAZARDS OVERLAY CODE 25
7.2 STATE PLANNING POLICY – NATURAL HAZARDS, RISK AND RESILIENCE 29
8 CONCLUSIONS 31
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Section 4
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001 Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah 8.1 CERTIFICATION MATTERS 31 9 REFERENCES 32 APPENDIX 1 – SITE LAYOUT 33 © 2021 iii
Section 5
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
1 INTRODUCTION
1.1 Background
This Bushfire Hazard Assessment and Management Plan has been prepared to assess and manage
the degree of potential bushfire hazard and associated risk acting on Lot 47 on RP860577, located
at 60 Glenridge Drive, Cooroibah (referenced hereafter as ‘the site’). The site is the subject of a
Reconfiguration of a Lot development application to be submitted to Noosa Council. This
assessment is to be used to assist Council with their decision-making process.
1.2 State Planning Policy Bushfire Intensity Overlay Map
The site is mapped under the State Planning Policy (SPP) (refer to Plate 1) as containing the
following Potential Bushfire Intensity areas:
• Medium Potential Bushfire Intensity area; and
• Potential Impact Buffer.
Plate 1 – SPP Bushfire Intensity Mapping Overlay
1.3 Development Proposal
The applicant is seeking to subdivide the existing allotment into eight new allotments. Lot size’s
range from 1.5-3.1ha, with a large portion of each Lot contained within a proposed conservation
covenant area which is to be the subject of extensive revegetation works. This assessment has been
based on post development conditions and therefore considers the impact of the revegetation works
with respect to bushfire risk on the site. The Plan of Development is included as Appendix 1.
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
2 Site Description
2.1 General
The site covers 16.38ha and is flanked by Glenridge Drive along the north-eastern boundary and
McKinnon Drive along the western boundary. The majority of the site is characterised by cleared
farmland with isolated vegetation patches adjacent to the site’s perimeter and in the site’s northeast
about a drainage feature. Various permanent and non-permanent structures are present adjacent to
the site’s western boundary and a dwelling with associated infrastructure is present in the northeast
corner of the site.
The site is zoned as Rural Residential within the Noosa Plan 2020.
Plate 2 depicts the site’s position in the landscape and the extent of existing development.
Plate 2 – Site Context (Source: Nearmap 2021)
2.2 Topography
The slope of the land is a major determinant of fire behaviour, particularly the slope of the land
under vegetation that contributes to bushfire hazard. Fire burns faster as it travels up slope, via
preheating of unburnt fuels ahead of the fire, increasing the rate of spread and fireline intensity.
Conversely, fires move more slowly as they travel downslope. Fireline intensity (kW/m) is a function
of the rate of spread (QFES 2019).
The site is located on relatively flat terrain. The site reaches a topographic high of approximately
14m AHD along the site boundaries and declines to a topographic low of approximately 11m AHD
about the gully in the site’s northeast. Undulating slopes of 1-2 degrees are prevalent across the
site. A shallow farm drain leads into a 1st order stream in the northern portion of the site. The stream
then flanks the eastern site boundary (off-site) and then returns in a south westerly direction through
the south-east corner of the site.
Plate 3 depicts topography conditions within and adjacent to the site.
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
Plate 3 – Site Topography (Source: NC Interactive Maps)
2.3 Vegetation within the site
The vegetation on site consists of recently harvested agricultural land and small strips of paperbark
open forest around the site’s perimeter and adjacent to the gully in the north-east corner.
2.4 Vegetation external of the site
Rural residential allotments containing a mixture of pasture and corridors of unmanaged paperbark
open forest are present to the south, east, and west of the site. Patches of dry eucalypt open forest
on slightly more elevated terrain are also present in the locality. Glenridge Park (Council reserve) is
present to the northeast of the site.
The only hazardous bushland directly contiguous with the site is present to the south-east.
Continuous fuel load pathways toward the site are fragmented by the presence of clearings and
roads along the balance perimeters of the site.
Plate 4 depicts the general extent of bushland fuel sources surrounding the site. Vegetation hazard
characteristics are described in Section 3.2.
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
Open forest
Open forest
Open forest
Open forest
Plate 4 – Dominant forest fire runs (Source: QLD Globe)
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
3 HAZARD ASSESSMENT
3.1 Hazard Assessment Methodology
The Noosa Planning Scheme requires that a site-specific bushfire hazard assessment be prepared
to assess the degree of bushfire hazard on a site captured within a mapped Designated Bushfire
Hazard Area. The SPP Bushfire Prone Area mapping prevails over the Noosa Bushfire Hazard Area
mapping with respect to the currency of the methodology adopted to prepare the mapping.
Accordingly, the site-specific hazard mapping required is to be prepared consistent with the
methodology adopted to prepare the SPP mapping.
The methodology used to prepare the SPP mapping is described in:
• Department of Infrastructure, Local Government and Planning’s Natural Hazards, Risk and
Resilience –– Bushfire (December 2019) State Planning Policy – state interest guidance
material; and
• Queensland Fire and Emergency Services - (2019) Planning for Bushfire Resilient
Communities.
Site-specific hazard maps are referred to as Local Hazard Area Maps in the SPP documents. The
preparation of Local Hazard Area Maps has been undertaken for the site in accordance with the
methodology described in the above referenced documents.
3.1.1 Local Hazard Area Map
A Local Hazard Area Map was prepared by adopting the following methodology:
• Categorizing the vegetation within the site in accordance with the vegetation hazard classes
derived from QFES (2019);
• Using the patch and corridor filtering process to remove narrow corridors and small patches
of VHC’s1;
• Subdividing the identified vegetation hazard classes into bushfire hazard sub-units based on
slope differences and vegetation hazard classes. All upslope and across slope vegetation
units are allocated an underlying slope of 1 degree as per methodology prescribed within
Queensland Fire and Emergency Services - (2019) Planning for Bushfire Resilient
Communities. The maximal slope recorded within 25m x 25m grids within the VHC’s is
adopted as the effective slope underlying the VHC. A conservative approach is adopted
where multiple slopes persist within VHC’s;
• Assigning SPP Potential Bushfire Intensity classes to the sub-units;
• Application of 100m Potential Impact Buffers to the amended sub-units to derive an overall
Local Hazard Area Map.
NOTE: The Local Hazard Area Map produced herein has incorporated the post development
vegetation conditions within the site which include extensive areas of revegetation works. Direct
liaison with the Project Ecologist; Conor Neville, was undertaken to understand the proposed
composition of the revegetation area. Mr. Neville has advised the revegetation palette is proposed
to match RE 12.3.14a which is described as Eucalyptus racemosa subsp. racemosa woodland to
open forest. Other canopy species may include Corymbia intermedia, C. gummifera, Eucalyptus
latisinensis, E. tindaliae and Melaleuca quinquenervia. Occurs on Quaternary alluvial plains in near
coastal areas. Given the prevalence of paperbarks about the site VHC 22.1 Paperbark Open forest
1 The patch and corridor filtering process to remove or downgrade hazard levels of small patches and narrow corridors involves the
following three stages:
• Merging small patches of a single Vegetation Hazard Class less than 0.5 ha;
• Merging small Vegetation Hazard Class patches between 0.5 and 1 ha with higher or moderate fuel loads (greater than 8
tonnes/ha); and
• Removing narrow corridors of vegetation less than 50m wide through a process of patch erosion and dilation. These small
patches are merged with surrounding vegetation by allocating a patch to the Vegetation Hazard Class that is most common to
the patch boundary (Leonard et al., 2017).
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
fuel loads have been assumed for assessment purposes.
3.2 Vegetation Hazard Classes
The following vegetation hazard classes (classified in accordance with QFES (2019)) were identified
within the assessment area which includes a 150m buffer surrounding the site:
• Vegetation Hazard Class 22.1 – Melaleuca open forests on seasonally inundated lowland
coastal swamps;
• Vegetation Hazard Class 39.2 - Low to moderate tree cover in built-up areas; and
• Vegetation Hazard Class 40.4 – Continuous low grass or tree cover.
The characteristics of each observed vegetation hazard class are described in the following sections
whilst Plan No. BF01 – Vegetation Hazard Classes depicts their distribution across the assessment
area.
3.2.1 Vegetation Hazard Class 22.1 – Melaleuca open forests on seasonally inundated
lowland coastal swamps
Vegetation Hazard Class 22.1 (VHC 22.1) is the dominant vegetation type in the assessment area.
The canopy has attained an average height of 10-15m and is dominated by Melaleuca quinquenervia
(broad-leaved paperbark), but also contained scattered Lophostemon suaveolens (swamp box),
Glochidion ferdinandi (cheese tree), and Eucalyptus racemosa (scribbly gum). It was also noted
remnant (15-20m) Corymbia intermedia (pink bloodwood) were also present in the canopy at low
densities scattered across the community.
The mid-storey was dominated by Allocasuarina littoralis (black she-oak) and Wattle spp.
The understorey is dominated by a range of native grass and sedge species, with areas of localised
native shrub species.
VHC 22.1 is attributed a potential combined surface fuel load of 23.4 t/ha and a potential total fuel
load of 28.4 t/ha (QFES, 2019). Plate 5 depicts typical conditions within VHC 22.1.
Plate 5 – Characteristic vegetation within VHC 22.1
3.2.2 Vegetation Hazard Class 39.2 – Low to moderate tree cover in built up areas
Vegetation Hazard Class 39.2 (VHC 39.2) is characterised by periodically slashed grassland with
low density woody vegetation. VHC 39.2 is attributed a potential combined surface fuel load of 5 t/ha
and a potential total fuel load of 8 t/ha (QFES, 2019). Plate 6 depicts typical conditions within
VHC 39.2.
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
Plate 6 – Characteristic vegetation within VHC 39.2
3.2.3 Vegetation Hazard Class 40.4 – Continuous low grass or tree cover in built up areas
Vegetation Hazard Class 40.4 (VHC 40.4) is located across the majority of the site and is
characterised by recently harvested agricultural land that has either been sown with grass seed or
exhibits bare earth. VHC 40.4 is attributed a potential combined surface fuel load of 4.5 t/ha and a
potential total fuel load of 5 t/ha (QFES, 2019). Plate 7 depicts typical conditions within VHC 40.4.
Plate 7 – Characteristic vegetation within VHC 40.4 (foreground)
© 2021 10
Section 12
LEGEND THE SITE VHC 22.1 Vegetation Hazard Class 22.1 Melaleuca open forests on seasonally inundated lowland coastal swamps. VHC 39.2 Vegetation Hazard Class 39.2 Low to moderate tree cover in built-up areas VHC 40.4 Vegetation Hazard Class 40.4 Continous low grass or tree cover VAL), UNITS OF VEGETATION REMOVED AS PER THE PATCH AND CORRIDOR FILTERING PROCESS A (Leonard et. al (2017) NOTE: This map assumes the post development vegetation conditions (i.e. incorporating the extent of onsite revegetation works into the mapping). (A3) 1:4000 North Coast at a a pal Meme: mental Poor e500 Pacts Parecve ox a5e¢ | BUSHFIRE HAZARD ASSESSMENT MARK BAIN CONSTRUCTIONS |e ed VEGETATION HAZARD CLASSES J001001 BFO1 A /§ Services hae asw soe2s 108625 | 6 GL ENRIDGE DRIVE, COOROIBAH 5 Rea Bre aA went 1:4000 @ A3
Section 13
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001 Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah 3.3 Potential Bushfire Intensity classes Table 1 details the Potential Bushfire Intensity classes and their corresponding potential fire-line intensity (KW/m) values as prescribed within Leonard et. al. 2017. Table 1: Potential Bushfire Intensity classes 3.4 Bushfire Hazard Sub-Units A sub-unit level Local Hazard Area Map has been prepared; Plan No. BF02 – Sub-Units and identifies the site scale Potential Bushfire Intensity classes across the site. The sub-unit level Local Hazard Area Map identifies that a High Potential Bushfire Intensity Areas associated with the VHC 22.1 are located within the site and offsite to the north, northeast, northwest, south, southeast, and southwest. 3.5 Overall Local Hazard Map An overall Local Hazard Map has been prepared; Plan No. BF03 – Local Hazard Map and identifies the Potential Bushfire Intensity classes across the site as well as associated 100m wide Potential Impact Buffer areas. A High Potential Bushfire Intensity area has been identified extending across a large portion of the site, consistent with the extent of revegetation works. The balance areas of the site to be developed are captured in a Potential Impact Buffer. A High Potential Bushfire Intensity area has also been identified offsite to the north, northeast, northwest, south, southeast, and southwest. The Local Hazard Map presented in Plan No. BF03 is to supersede the SPP broadscale mapping attributed to the site and should be used to guide the formulation of appropriate site-based bushfire management measures for the proposal. © 2021 12
Section 14
Sub Unit 1 - siope assessed as 1 degree due to Sub Unit being located across/upslope relevantto the development are: (Fireline intensity calculated using Flamesol modelling adopting woodland as the relevant veg Sub Unit 2 -siopeassessed as 1 degrees due to Sub Unit being located across/upslope relevant to the development ar [Firetine intensity calculated using Flamesol modelling adopting wood! and as the relevant veg Sub Unit 3 -siope assessed as 1 degree due to Sub Unit being located across slope relevant to the development area. adopting forest as the relevant # From: Leonard, 1, & Opie, K, (2017) Estimating the potential bushfire hazard of vegetation patches and corridors — an enhancement of Queensland's methodol ogy for State-wide mapping of bushfire prone areas. CSIRO, Australia * From: Leonard, 1, Newnham, G., Opie, K, and Blanchi, 8, (2014) A new methodology for state-wide mapping of bushfire prone areas in Queensland. CSIRO, Australia NOTE: This map assumes the post development vegetation conditions (i.e. incorporating the extent of onsite revegetation works into the mapping). = a ral | 5 ° E 5 eS < 0 LEGEND 150m ASSESSMENT BUFFER SS LOW POTENTIAL BUSHFIRE INTENSITY || HIGH POTENTIAL BUSHFIRE INTENSITY Gy Pee dhe) eames PO Box $588 Pacific Paradise, Old, 4564 save ov. ase¢ | BUSHFIRE HAZARD ASSESSMENT aaesoessvoee | 60 GLENRIDGE DRIVE, COOROIBAH J001001 BFO2 A me 1:4000 @ A3
Section 15
LEGEND THE SITE [ 150m ASSESSMENT BUFFER LOW POTENTIAL BUSHFIRE INTENSITY | HIGH POTENTIAL BUSHFIRE INTENSITY WY POTENTIAL IMPACT BUFFER NOTE: This map assumes the post development vegetation conditions (i.e. incorporating the extent of onsite revegetation works into the mapping). 75 100 125 (A3) 1:4000 North Coast magi ETT am A nvironmental Po Box sse0 Paste Penave ow ase¢ | BUSHFIRE HAZARD ASSESSMENT MARK BAIN CONSTRUCTIONS [=] LOCAL HAZARD MAP /§ a Re sia seis aenene2s 108625 | GQ GL ENRIDGE DRIVE, COOROIBAH - 7
Section 16
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
3.6 Quantitative Modelling
Quantitative modelling of the potential bushfire conditions that may be experienced within the
VHC 22.1 Melaleuca open forest to be revegetated within the site and adjoining parts of the
site has been undertaken to assist in determining the suitability of the development and any
asset setback requirements.
The models used comprise industry standard bushfire equations which have been built into
the FPAA endorsed FLAMESOL computer model. FLAMESOL allows numerous input
variables to be adjusted including fuel loads, fire danger index, site slope and distance to
vegetation. FLAMESOL uses the following algorithms:
• Rate of Spread – McArthur (1973) and Nobel et al. (1980)
• Flame Length – NSW Rural Fire Service (2001) and Nobel et al. (1980)
• Elevation of Receiver – Douglas and Tan (2005)
• Flame Angle – Douglas and Tan (2005)
• Radian Heat Flux – Drysdale (1999), Sullivan et al. (2003) and Douglas and Tan (2005)
The FLAMESOL Minimum Distance calculator has been used and comprises an AS
3959:2018 Method 2 (Appendix B) based calculator which will determine standard bushfire
behaviour variables as well as the minimum distances required to achieve a range of different
radiant heat levels (represented by BAL's).
Fuel load inputs have been drawn from Planning for Bushfire Resilient Communities (QFES
2019) based on the calculated potential fuel loads for VHC 22.1 (23.4 t/ha surface and near
surface fuels and 28.4 t/ha total fuels). 1º effective slope was adopted for the slope underlying
the VHC 22.1 Melaleuca open forest given across slope conditions underlying the vegetation.
The default Flame Width of 100m was chosen given the large variance in the edge width of
the onsite and offsite VHC 22.1 Melaleuca Forest vegetation.
A Forest Fire Danger Index (FFDI) of 47 has been adopted for the site consistent with the
assignment by QFES (Catalyst 2020) (refer Plate 8).
Plate 5 – FFDI (Source: QFES redi Map)
The Flamesol output results are shown in Plate 9.
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
Plate 6 – VHC 22.1 (Melaleuca open forest) – 1 degree – 100m Flame Width
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
4 BUSHFIRE RISK ASSESSMENT
4.1 General
A bushfire risk assessment for the proposed building areas has been prepared generally in
accordance with State Planning Policy – State Interest Guideline – Natural Hazards, Risk and
Resilience (DILGP, 2016) and AS/NZS ISO 31000:2018 – Risk Management Methodology.
The bushfire risk assessment details the likelihood that the proposed development will be
exposed to radiant heat impact considering the proximity to bushfire prone vegetation and
likely bushfire behaviour. Plate 10 illustrates the main bushfire attack mechanisms acting on
buildings.
Plate 10 – Figure A 5.1 Bushfire attack mechanisms (Planning for Bush Fire Protection, 2006)
According to AS/NZS ISO 31000:2018, a ‘hazard’ is defined as a source of potential harm or
a situation with a potential to cause loss, whereas a ‘risk’ is the chance of something
happening that will have an impact on objectives measured in terms of consequences and
likelihood. The State Planning Policy – State Interest Guideline – Natural Hazards, Risk and
Resilience (DILGP, April 2016) refers to ‘acceptable risk’, ‘tolerable risk’, and ‘intolerable risk’
which are defined below.
• Acceptable risk
o A risk that, following an understanding of the likelihood and consequences, is
sufficiently low to require no new treatments or actions to reduce risk further.
Individuals and society can live with this risk without feeling the necessity to
reduce the risks any further.
• Tolerable risk
o A risk that, following an understanding of the likelihood and consequences, is
low enough to allow the exposure to continue, and at the same time high
enough to require new treatments or actions to reduce risk. Society can live
with this risk but believe that as much as is reasonably practical should be done
to reduce the risks further.
• Intolerable risk
o A risk that, following an understanding of the likelihood and consequences, is
so high that it requires actions to avoid or reduce the risk. Individuals and
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
society will not accept this risk and measures are to be put in place to reduce
risks to at least a tolerable level.
Assessment Benchmark 4 of the SPP Bushfire 2019 references radiant heat flux exposure of
<29kW/m² on any part of the building as generating an Acceptable to Tolerable level of risk.
AS/NZS ISO 31000:2018 defines ‘Likelihood’ as the chance that something might happen.
Likelihood can be defined, determined, or measured objectively or subjectively and can be
expressed either qualitatively or quantitatively (using mathematics ). The following ‘likelihood’
categories for the probability of the assessed bushfire attack mechanisms impacting the
assessment area have been adopted within this assessment:
• Likely - Will probably occur
• Unlikely - Could occur but doubtful
The determination of whether a bushfire event is likely or unlikely to occur (i.e., impact the
site) has been based on the relative position of hazardous vegetation to the site. Hazardous
vegetation located upwind of the site under typical south-east Queensland (SEQ) seasonal
fire winds from the north to north-west to west to south-west are deemed to be exposed to a
‘likely’ probability of impact. Hazardous vegetation located downwind of the site under typical
SEQ seasonal fire winds are deemed to be exposed to an ‘unlikely’ probability of impact.
4.2 Risk from Identified Hazardous Vegetation
The Plan of Development depicts building envelopes within the proposed Lots which will be
primarily flanked by hazardous on all sides, precluding Lots 1 and 2. The likelihood of a fire
approaching from the northwest, west, and southwest is considered likely, given dominant
regional fire weather winds are derived from the north-west to south-west.
The degree of separation offered to the adjoining vegetation is the primary driver of the
assigned level of risk and was determined with consideration to the Flamesol modelling output
presented in Section 3.3. In the absence of an appropriate separation buffer to the adjacent
vegetation, and implementation of relevant AS3959-2018 construction standards, the future
dwellings on the site could be exposed to direct flame, severe radiant heat and ember attack
during the modelled bushfire conditions resulting in total structure loss.
The Plan of Development depicts a minimum 25m setback between the proposed building
envelopes and the onsite revegetation works and/or off-site hazardous vegetation (VHC 22.1
forest). A minimum of 20.1m is the minimum separation required to ensure the proposed
building envelopes on the Lots 1-8 are exposed to <29kW/m² radiant heat flux as per the
Flamesol modelling presented herein. The extent of proposed separation therefore facilitates
an acceptable risk of radiant heat impact thereby satisfying Assessment Benchmark 4 of the
SPP Bushfire 2019.
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
5 BUSHFIRE IMPACT REDUCTION MEASURES
5.1 General
The following section describes bushfire impact reduction measures to be incorporated into
the proposed development to reduce the risk of bushfire impacts to people and property.
Implementation of the identified measures is not implied nor intended to advocate that building
occupants remain on the site during a bushfire event, nor that people and property will be
protected from bushfire impacts. The measures are intended to reduce the potential severity
of bushfire impact to the development and not prevent bushfire impact. The bushfire mitigation
measures have been derived from:
• Department of State Development, Manufacturing, Infrastructure and Planning’s State
Planning Policy – State interest guidance material – Natural hazards, risk and
resilience – Bushfire (December 2019) (referenced herein as SPP (Bushfire) 2019);
and
• Queensland Fire and Emergency Services. (2019). Planning for Bushfire Resilient
Communities.
5.2 Asset Protection Zones
5.2.1 General
Asset Protection Zones (APZ) provide a defensive tool to assist in the reduction of potential
bushfire impact to people and property situated in bushfire prone areas. For illustrative
purposes, Plate 11 depicts the concept of an APZ surrounding a dwelling in a bushfire prone
areas.
Plate 11 – Asset Protection Zones
The development has been confirmed to be located within a bushfire hazard area hence
provision of adequate separation between the building envelopes nominated immediately
flanking the hazardous vegetation is required to provide a reasonable level of safety to site
occupants and emergency services staff.
The configuration of APZ’s is typically determined based on the results of the site-specific
hazard assessment including risk of bushfire impact, flame length analysis, applicable
AS3959-2018 Bushfire Attack Levels and State Planning Policy – State Interest Guidance
Material (Natural Hazards, Risks and Resilience – Bushfire) December 2019 Assessment
Benchmark setback requirements, with the latter the primary determining factor.
Assessment Benchmark 4 of the State Planning Policy – state interest guidance material
states:
Development supports, and does not hinder, disaster management response or recovery
capacity or capabilities. Where reconfiguring a lot creating lots of greater than 2000 square
metres:
To ensure emergency access and operational space for firefighters the subdivision layout
results in lots that are sited so that they are separated from the closest edge to the adjacent
© 2021 19
Section 21
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001 Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah medium, high or very high potential bushfire intensity area by a distance that achieves a radiant heat flux level of 29 kilowatt per square metre or less at: 1. The building envelope, if identified at RaL stage, or 2. Where a building envelope is not identified, at all the lot boundaries. Compliance with Assessment Benchmark 4 can be attained where all allotments are sufficiently separated from the nearby forest hazard so that a radiant heat flux level at any point on the building envelope, or the lot boundaries where no building envelope is identified, does not exceed 29 kW/m². The output results from Plate 9 in Section 3.6 identify that a minimum setback of 20.1m is required to the edge of the adjoining VHC 22.1 vegetation to achieve the <29 kW/m² radiant heat flux acting on the proposed building envelopes. All of the proposed building envelopes have been provided with a minimum 25m setback to the VHC 22.1 vegetation located both onsite and offsite, hence the extent of separation proposed satisfies the Assessment Benchmark 4 <29 kW/m² criteria and achieves an acceptable risk under the SPP. For management purposes, the cleared areas within each lot between the building envelopes and the adjacent covenant areas is considered to be an asset protection zone which is to be maintained as a low threat area for the life of the development (refer Section 5.6 for management requirements). 5.3 Water Supply The availability of a reliable water supply for firefighting purposes is a vital tool in the defence of bushfire impact. Reticulated water supply is currently not available within the site nor proposed to be connected to the site. The proposed development will therefore require provision of a readily accessible on-site emergency static water supply in accordance with Assessment Benchmark 4 of the SPP Bushfire 2019. Assessment Benchmark 4 references the QFES 2019 Bushfire Resilient Communities document for information regarding appropriate static water supply. Section 9.1 of Bushfire Resilient Communities’ states: An appropriate static water supply (in bushfire prone areas where reticulated supply is not provided) to support effective emergency services response includes a water tank that is available solely for firefighting purposes and can be accessed by firefighting appliances. The 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 supply to be left available for access by firefighters: i.10,000 litres for residential buildings; It is therefore recommended that a dedicated 10,000 litres should be made available to the future dwellings on each of the proposed new lots and this volume should be reserved for firefighting purposes only. Plate 12 outlines an example of how this can be achieved. © 2021 20
Section 22
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
Plate 12 – Example Static Water Supply tank design for firefighting purposes (Source: Kingspan Group
2021)
5.4 Fire Breaks
The provision of fire breaks and fire trails within a site located in a bushfire prone area offers
an important bushfire defence measure to assist in reducing the risk and severity of bushfire
ingress onto and through a site. A risk of fire impact has been identified surrounding the
proposed building envelopes.
It is therefore recommended a trafficable fire break trail is provided around the perimeter of
the covenant areas on each lot as per Plate 13.
Plate 13 – Recommended fire break trail alignment (---)
The fire break trail is to conform to the QLD SPP Bushfire 2019 fire break trail specifications
which are identified in Plate 14 and are taken to supersede the specifications listed in AO8.2
of the Noosa Council Bushfire Hazard Overlay Code with regards to competing elements of
the specifications (i.e., fire break trail widths). The fire break trail should offer continuous
© 2021 21
Section 23
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
access between lots (i.e., gates provided within boundary fencing) to allow for safe access
and egress and operational space for fire-fighting vehicles. Given the level topography of the
site the trail can be an earthen trail (i.e., unsealed).
Plate 14 - SPP Bushfire 2019 Assessment Benchmark 4 Table 4 Fire trail specifications
5.5 Vehicular Access
Development in bushfire prone areas should be serviced by safe access/exit points for both
occupants and emergency services personnel.
The development is to be serviced by a new dual lane road with access directly from Glenridge
Drive adjacent to the site’s north-eastern boundary. The total length of the proposed road is
approximately 200m and will generally be constructed on level ground. The proposed new
road will be flanked by the revegetation areas within the site which will represent hazardous
bushland within a few of years of establishment. Therefore, the risk of access/egress
becoming constrained within the site during a bushfire event is deemed tangible. Specific
additional road design recommendations are therefore deemed warranted and comprise:
• The road design complies with the Fire Hydrant and Vehicle Access Guidelines for
residential, commercial and industrial lots, Queensland Fire and Emergency Services,
2015, unless otherwise specified by the relevant water entity; and
• The revegetation works within the covenant areas and road verge maximises the use
of low flammability species for at least 10m width where it interfaces with the proposed
new road through the site.
5.6 Landscaping and Regrowth
Existing and future landscaping within the site should avoid increasing the potential for
bushfire hazard. Assessment benchmark 5 of the SPP Bushfire 2019 seeks that the site layout
places the landscape and open spaces within the site between premises and adjacent mapped
medium, high or very high potential bushfire intensity areas. This landscaping and open space
comprises protective landscape treatments that:
1. Comprise only low threat vegetation (for example grassland managed in a minimal fuel
condition, maintained lawns, golf courses and cultivated gardens); or
2. Are designed to ensure a potential available fuel load is maintained at less than 8
tonnes/hectare in aggregate and with a fuel structure that remains discontinuous.
To reduce the potential for bushfire impact to buildings, structures and occupants as a result
© 2021 22
Section 24
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
of future regrowth and landscaping works within the site, it is recommended:
• Any landscaping within the nominated APZ’s satisfies Assessment Benchmark 5 of the
SPP Bushfire 2019, including the low threat vegetation criteria prescribed in section
2.2.3.2 of AS 3959:2018 or later iterations thereof;
• No woody mulch is used within 2m of buildings;
• No trees or shrubs are retained within 6m of the buildings;
• Beyond 6m, any trees desired to be retained are to be continuously defoliated below
< 4m height above ground level and no limbs are to extend to within 6m of the roof line
of the buildings. All pruning should be undertaken in accordance with AS 4373 Pruning
of amenity trees;
• Future landscaping works/plantings maximise the use of locally indigenous, low
flammability species within the edge of the rehabilitation areas flanking building
envelopes. Landholders should consult their local native plant nursery for suitable
species selection; and
• The revegetation works within the covenant areas and road verge incorporates low
flammability species for at least 10m width where it interfaces with the proposed new
road through the site.
All APZ’s are required to be maintained by the individual landholder/s and or occupants and
are to consist of low threat understorey vegetation conditions (e.g., mown grass) in perpetuity.
5.7 General Property Maintenance
The undertaking of an appropriate level of property maintenance throughout the year, and in
particular prior to the fire season, can significantly reduce the severity of fire impact upon a
site. Queensland Fire and Emergency Services recommend the following general actions be
undertaken to prepare for the fire season:
Structure
• Clear leaves, twigs, bark and other debris from the roof and gutters.
• Purchase and test the effectiveness of gutter plugs.
• Enclose open areas under decks and floors.
• Install fine steel wire mesh screens on all windows, doors, vents and weep holes.
• Point LPG cylinder relief valves away from the house.
• Conduct maintenance checks on pumps, generators and water systems.
• Seal all gaps in external roof and wall cladding.
Access
• Display a prominent house or lot number, in case it is required in an emergency.
• Ensure there is adequate access to your property for fire trucks - 4 metres wide by 4
metres high, with a turn-around area.
Vegetation
• Reduce vegetation loads along the access path.
• Mow your grass regularly.
• Remove excess ground fuels and combustible material (long dry grass, dead leaves
and branches).
• Trim low-lying branches two metres from the ground surrounding your home.
Note the above recommendations are that of QFES and are offered herein for advisory
purposes. They have not been set as recommendations for certification purposes.
© 2021 23
Section 25
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
6 AUSTRALIAN STANDARD 3959:2018 CONSTRUCTION OF BUILDINGS IN
BUSHFIRE PRONE AREAS (AS 3959:2018) SETBACKS
In general, the far northern and southern portions of the site are mapped within the Bushfire
Hazard Overlay in the Noosa Plan 2020 (refer Plate 13) and SPP Bushfire Hazard Overlay
Map (refer Plate 1).
Plate 15 – Asset Protection Zones
Building works within land which has been designated under a power of legislation as being
subject, or likely to be subject, to bushfires triggers building design assessment under AS
3959:2018 (NCC 2019).
The Standard provides minimum construction requirements for new habitable dwellings and
habitable building alterations in designated Bushfire Prone Areas. The construction
requirements are intended to improve the performance of buildings subjected to burning
debris, radiant heat or flame contact. Building works in Designated Bushfire Prone Areas must
be built to the Bushfire Attack Level (BAL) construction standard relevant to the building site
as identified by the AS 3959:2018 methodology.
Based on the setbacks provided, all future Class 1 buildings are anticipated to achieve a BAL
29 construction standard or lower. A specific BAL assessment will be required once building
plans have been progressed given the BAL relies on an accurate understanding of the final
footprint of the building within the individual building envelopes and is required to be assessed
against the active iteration of the Standard at the time of assessment.
In this instance it is noted that several of the proposed building envelopes are located outside
of the mapped extent of both the Noosa Council and State Planning Policy designated Bushfire
Prone Areas. Proposed building works located outside of these mapped areas are not required
to be built to satisfy AS 3959. It is noted that mapping would be expected to be expanded
across the entire site in the future once the extent of proposed revegetation works matures.
© 2021 24
Section 26
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001 Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah 7 LEGISLATION AND OVERLAYS 7.1 Noosa Plan 2020 – Natural Hazards Overlay Code The proposed development is considered assessable development and therefore is assessable against Table 8.2.3.3 Bushfire Hazard Area of Council’s Bushfire Overlay Code which has been reproduced as Table 5. © 2021 25
Section 27
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
Table 5 – Table 8.2.3.3 Bushfire Hazard Areas – Part 8 Overlay Code Noosa Plan 2020
PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
Safety of people and property
PO1 AO1.1 This Bushfire Hazard Assessment and Management Plan has been prepared to
Development maintains the safety of people and Development which will materially increase the number of people maintain the safety of people and property from the adverse impacts of bushfire.
property from the adverse impacts of bushfire. living or congregating on premises, including reconfiguring a lot, is not
AO1.1 –The proposed building envelopes and APZ’s are located outside of a
located within a medium or high bushfire hazard area.
mapped medium or high bushfire hazard area as depicted on the Local Hazard
Area Map BF03.
AO1.2
Development maximises setbacks from hazardous vegetation to AO1.2 – The development has provided minimum setbacks between the
achieve an acceptable risk. proposed building envelopes and hazardous vegetation to achieve the SPP
Assessment Benchmark 4 criteria of <29kW/m2 radiant heat flux exposure. This
Editor’s Note —PSP8 Natural Hazards provides guidance for setback achieves an acceptable risk where all the mitigation measures detailed
assessing bushfire hazard risk and preparing a bushfire hazard within this report are employed.
management plan.
Impact on Ecologically Important Areas
PO2 No acceptable outcome provided No clearing of vegetation for bushfire mitigation measures is required. The
Bushfire mitigation measures do not adversely impact bushfire mitigation measures prescribed herein will not adversely impact on
on: biodiversity values, connectivity, ecosystem functioning, and the long-term
physical integrity of waterways, wetlands and areas of native vegetation.
a) biodiversity values, connectivity and ecosystem
functioning; and
b) the long term physical integrity of waterways, wetland
and areas of native vegetation.
Water Supply for Fire Fighting Purposes
PO3 AO3.1 AO3.1 – No reticulated water is currently available to the site. The water supply
Development provides an adequate water supply for Premises are connected to the reticulated water supply. requirements of SPP Assessment Benchmark 4 prevails; 10,000KL, and can be
firefighting purpose which is reliable, safely located and conditioned with an approval.
freely accessible. Editor's note—For reconfiguring a lot, water supply needs to provide
Note, the reliance upon dams or pools for water storage is not an acceptable
for a minimum flow and pressure of 10 litres a second at 200kPa at all
solution under the SPP.
times for firefighting purposes.
OR
AO3.2
Where there is no available reticulated water supply, the premises
has:
a) an accessible dam, swimming pool or water tank available for
firefighting purposes with an onsite water volume of not less than
5,000 litres; and
b) a water supply outlet pipe 50 millimetres in diameter fitted with a
standard fire brigade fitting connected to the water supply (other than
where the water supply is in a swimming pool or dam).
© 2020 26
Section 28
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
Editor’s Note—Water supply capacity for firefighting purposes is in
addition to water supply capacity for other uses and activities on the
premises.
Essential Community Infrastructure
PO4 AO4.1 N/A - The proposed development does not involve essential community
Essential community infrastructure is able to function Development involving essential community infrastructure is not infrastructure.
effectively during and immediately after bushfire events. located within a medium or high bushfire hazard area.
OR
AO4.2
Where located in a medium or high bushfire hazard area,
development involving essential community infrastructure is designed
to function effectively during and after a bushfire event in accordance
with a Bushfire Hazard Management Plan.
Editor’s Note— PSP8 Natural Hazards provides guidance for
assessing bushfire hazard risk and preparing a bushfire hazard
management plan.
Hazardous Material
PO5 AO5 AO5 - The proposed development does not involve the manufacture or storage
Public safety and the environment are not adversely Hazardous materials are not manufactured or stored in bulk in a of hazardous materials in bulk.
affected by the impacts of bushfire on hazardous bushfire hazard area.
materials manufacturing or storing in bulk.
Access and Evacuation Routes
PO6 AO6.1 PO6 - The road design, in conjunction with the recommendations set herein
Roads provide for easy and safe evacuation of residents The road layout provides for through-roads and avoids cul-de-sacs (refer sections 5.3-5.5) is considered to provide for easy and safe evacuation of
of premises and access by emergency services. and dead-end roads. residents and access by emergency services.
OR
AO6.2
The development has a perimeter road reserve with a minimum width
of 20 metres and maximum gradient of 12.5%.
OR
AO6.3
Cul-de-sacs or no-through roads are provided with fire trails or access
easements, which are capable of being navigated by conventional
vehicles and which link to through roads.
AO6.4
Safe access and egress is available at all times to all of the
development for emergency vehicles and personnel.
© 2020 27
Section 29
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
AO6.5
Where an emergency access point is required, it complies with the
relevant works codes and PSP6 Engineering Design Standards.
Lot design
PO7 AO7 AO7-
Lot design and building siting minimises bushfire hazard Each residential lot:
a) BLE’s are identified on the plan.
risk to people and property. a) includes a building envelope, identified on a plan of subdivision;
b) Each lot is positioned on near flat land and has been provided with a 25m
b) is of sufficient size and shape to allow for efficient emergency
wide APZ between the edge of hazardous vegetation and the BLE, allowing for
access to buildings for firefighting appliances (e.g. by avoiding battle-
easy access during an emergency. Lot 3 requires an approximate 90m traverse
axe/hatchet lots and long narrow lots with long access driveways to
from the proposed cul de sac head. The sharded driveway to Lot 3 traverses low
buildings);
threat conditions created by the future dwellings and associated APZ’s on Lots
c) where more than 2500m², achieves setbacks from hazardous 4, 6 and 7 and therefore is not expected to be exposed to risk of restricted egress
vegetation in line with Bushfire Attack Level 29 requirements as per and access during a bushfire emergency on the site.
AS3959; and
c) All proposed Lots achieve setbacks from hazardous vegetation which are
d) is designed so that buildings and structures are sited in locations of expected to secure a maximum Bushfire Attack Level 29 construction
lowest hazard within the lot and elements of the development least requirement under AS3959.
susceptible to fire are closest to the fire hazard.
d) Each lot has located a dedicated APZ between the BLE and the hazardous
vegetation providing sufficient separation to confirmed hazardous vegetation to
secure a maximum BAL 29 construction standard under AS3959.
Firebreaks and fire access tracks
PO8 AO8.1 AO8.2 - Fire access tracks (fire break trails) are proposed between the building
Firebreaks and fire access tracks provide: Where development involves the creation of a new road and lots, a envelopes and the edge of hazardous vegetation and are proposed to conform
firebreak is provided by providing a cleared road reserve not less than to the QLD SPP Bushfire 2019 fire break trail width specification in lieu of the
20 metres wide and maximum gradient of 12.5% around the perimeter widths set under AO8.2 (a) (refer Section 5.4). The trail design will also satisfy
a) adequate access for firefighting and other
of the subdivision, between the created lots and surrounding AO8.2 (b-e).
emergency vehicles; and
vegetated lands.
b) adequate access for the evacuation of residents and OR
emergency personnel in an emergency situation. AO8.2 AO8.3 – All bushfire management measures prescribed herein would be
Fire access tracks are provided between the created lots and carried out on the subject property and not rely upon any adjoining property.
surrounding vegetated land that:
a) have a cleared minimum width of 6 metres;
b) have a maximum gradient of 12.5%;
c) provide unbroken access for fire fighting vehicles;
d) provide passing bays and turning areas;
e) are located within an access easement that is granted in favour of
Noosa Council and the Queensland Fire and Rescue Service.
AO8.3
Bushfire management measures are carried out on the subject
property and not any adjoining property.
© 2020 28
Section 30
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001 Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah 7.2 State Planning Policy – Natural Hazards, Risk and Resilience The Department of State Development, Manufacturing, Infrastructure and Planning’s State Planning Policy – State interest guidance material – Natural hazards, risk and resilience – Bushfire (December 2019) contains the development assessment benchmarks for natural hazards, risk and resilience - bushfire. The SPP assessment benchmarks prevail over those prescribed in the Noosa Plan Natural Hazards Overlay Code where they involve the same design elements. An assessment of the proposed development’s compliance with each of the assessment benchmarks has been provided below. Assessment Benchmark 4 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 vehicles. Reticulated water supply is not available to the site hence a dedicated static water supply of 10,000L for each future dwelling is recommended as per the SPP Bushfire 2019 water supply guidance material recommendations. Where reconfiguring a lot creating lots of greater than 2000 square metres To ensure emergency access and operational space for firefighters, include a development footprint plan that is separated from the closest edge of the adjacent mapped medium, high or very high potential bushfire intensity area by a distance that achieves a radiant heat flux level of 29 kilowatt per square metre or less. To facilitate safe evacuation during a bushfire event, include a development footprint plan that is located within 60 metres of the street frontage and sited to enable a route between the development footprint plan and the street frontage with a gradient that does not exceed of 12.5 per cent. All of the proposed BLE’s are provided with enough separation to achieve <29 kW/m² radiant heat flux hence satisfying the Assessment Benchmark 4 <29 kW/m² criteria. All of the proposed BLE’s will be located <60m from either Glenridge Drive or the proposed new internal road and accessed via driveways with a gradient of well less than 12.5%, precluding the BLE on Lot 3 which requires an approximate 90m traverse from the proposed cul de sac head. The sharded driveway to Lot 3 traverses low threat conditions created by the future dwellings and associated APZ’s on Lots 4, 6 and 7 and therefore is not expected to be exposed to risk of restricted egress and access during a bushfire emergency on the site. Where reconfiguring a lot creating additional lots for the purpose of residential development and a reticulated water supply is not provided (fire trails). To ensure safe access and egress and operational space for rural fire-fighting vehicles, a fire trail and working area is provided that separates the new residential lot or development footprint plans from adjacent mapped medium, high or very high potential bushfire intensity and is designed and constructed in accordance with the design parameters in Table 4. An SPP compliant fire break trail has been recommended. Assessment Benchmark 5 Where reconfiguring a lot. Subdivision design avoids locating lots (or for lots greater than 2000 square metres, avoids locating the development footprint plan) that are within bushfire prone areas and on ridgelines, saddles and crests where slopes exceed 15 per cent. All of the proposed Lots are >2000m² and the whole site is positioned on slopes of <15%. Assessment Benchmark 7 Where a requirement for an asset protection zone (or similar) exists Landscaping treatments comprise only low threat vegetation, including grassland managed in a minimal fuel condition, maintained lawns, golf courses, maintained public reserves and parklands, © 2021 29
Section 31
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001 Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah vineyards, orchards, cultivated gardens, commercial nurseries, nature strips and windbreaks. OR Landscaping management maintains a potential available fuel load which is less than eight tonnes/hectare in aggregate, and fuel structure which is discontinuous. OR Development includes a bushfire management plan for the maintenance of any identified asset protection zone, including landscape design and ongoing vegetation management. This document includes a Bushfire Management Plan. © 2021 30
Section 32
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001
Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah
8 CONCLUSIONS
This Bushfire Hazard Assessment and Management Plan has been prepared to assess and
manage the degree of potential bushfire risk acting on the proposed 1 into 8 Reconfiguration
of a Lot development application for 60 Glenridge Drive, Cooroibah.
A Local Hazard Map has been prepared for the site consistent with the State Planning Policy
– Natural Hazards, Risk and Resilience – Technical Manual – A ‘fit for purpose’ approach in
undertaking natural hazard studies and risk assessments. The Local Hazard Map has
identified that High Potential Bushfire Intensity areas are located onsite and offsite to the north,
northeast, northwest, south, southeast, and southwest. All building envelopes and APZ’s will
be positioned ina Potential Impact Buffer post development.
A bushfire risk assessment has been undertaken in general accordance with AS/NZS ISO
31000:2018 – Risk Management Methodology. The risk assessment identified that a
satisfactory APZ is provided within each of the proposed lots to deliver an Acceptable risk of
radiant heat impact to the future dwellings.
Overall, the development proposed for the site, in combination with recommendations
referenced herein, is deemed suitable with respect to providing a reasonable level of
protection for people and property within the site.
Bushfire is an extremely serious and often unpredictable phenomenon that requires serious
preparatory planning and decision making to avoid potential damage to infrastructure and or
loss of life. All recommendations made herein have been formulated based on site conditions
at the time of writing and therefore may not be appropriate in the event site conditions change
over time.
Implementation of the bushfire mitigation measures referenced herein is not implied nor
intended to advocate that residents remain on the site during a bushfire event nor that people
and property will be protected from bushfire impact. The measures are intended to reduce
the potential severity of bushfire impact to persons and property and not prevent actual
bushfire impact.
The landowners and site managers are to be responsible for ensuring the measures
prescribed herein are applied and stay up to date with site conditions and industry standards.
Landholders/managers should therefore liaise with Queensland Fire and Rescue Services at
regular intervals (e.g., recommended at least every 5 years).
The first call in the event of a bushfire emergency should always be ‘000’.
8.1 Certification Matters
The following bushfire mitigation measures are to be certified as satisfactorily completed by
the project Bushfire Consultant prior to commencement of the proposed/approved uses on the
site:
• All actionable recommendations set in Section 5 of this report have been implemented
(i.e., establishment of APZs, landscaping etc.) where practical at the time of
certification.
© 2021 31
Section 33
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001 Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah 9 REFERENCES Cruz M.G., Gould J.S., Alexander M.E., Sullivan A.L., McCaw W.L., Matthews S. (2015) A Guide to Rate of Fire Spread Models for Australian Vegetation. CSIRO Land and Water Flagship, Canberra, ACT, and AFAC, Melbourne, Vic, 123pp. Gould, McCaw, Cheney, Ellis & Matthews. (2007). Field Guide – Fuel assessment and fire behaviour in dry eucalypt open forest. Ensis-CSIRO, Canberra, ACT and Department of Environment and Conservation, Perth, WA. Leonard, J., Opie, K. (2017). Estimating the potential bushfire hazard of vegetation patches and corridors. An enhancement of Queensland’s methodology for State-wide mapping of bushfire prone areas. CSIRO Land & Water, Australia. Noosa Planning Scheme (2006). Bushfire Hazard Overlay Code. Noosa Council. Queensland Fire and Emergency Services. (2019). Bushfire Resilient Communities - Technical Reference Guide for the State Planning Policy - State Interest Guideline - Natural Hazards, Risk and Resilience 2- Bushfire. Southeast Queensland Fire and Biodiversity Consortium – Operational Manual. The State of Queensland, Department of State Development, Manufacturing, Infrastructure and Planning (2019). Natural hazards, risk and resilience - Bushfire State Planning Policy – state interest guidance material. Webster. (2002). The Complete Bushfire Safety Book. Random House (Aust) Pty Ltd. © 2021 32
Section 34
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J001001 Lot 47 on RP860577 – 60 Glenridge Drive, Cooroibah APPENDIX 1 – SITE LAYOUT © 2021 33
Section 35
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Section 36
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5
.2
NEW
12.25
12
12
13
.5
12.5 11.75 11.75
12.2
12.5
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13
13.25
12
12.5
5
11
11.5
12
25
12
.
12
.75
12.5
11.75
111. 1.5
12.75 12.7
12 11.7
12
5
75 1
11.75
5
25
12.7
13.2135.
12
1
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25
25
5
13.5
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13
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13
12.5 12.2
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5 5
25
13
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12.5
25
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12
11
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10 12.5
3.5
5 12.7
5
13.2
7
1 5
2.
10
The text continues on section 37.