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Appendix A - Bushfire Hazard Assessment & Management Plan
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BUSHFIRE HAZARD ASSESSMENT AND MANAGEMENT
PLAN v1
LOT 101 ON SP168341
DRAFT NOT FOR SUBMISSION PURPOSES
9A JIRRIMA CRESCENT COOROIBAH
FOR
MAUD CAZOT
DECEMBER 2020
PO Box 9566 Pacific Paradise QLD 4564 / Email: [email protected]
ABN 60 625 108 625
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Page 2
Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
DOCUMENT CONTROL
Document: Bushfire Hazard Assessment & Management Plan
Client: Maud Cazot
Project Number: J000706
Project: Reconfiguration of a Lot (1 into 2)
Site: Lot 101 on SP168341
9a Jirrima Cres, Cooroibah
DRAFT NOT FOR SUBMISSION PURPOSES
File Ref: C:\CLIENTS\CAZOT MAUD - 9A Jirrima Cres, Cooroibah\04
REPORTING\BHAMP\Bushfire Hazard Assessment & Management Plan v1 - 9A
Jirrima Cres, Cooroibah
Version Date Distribution Author/s Approved
1 14/12/2020 Cazot Maud R. Cairney Joshua Lee
Callan Lowrie (Murray BDes (L’Arch) (B. Sc. AES, mEIANZ)
& Associates Pty Ltd) AssocDegAppSc - Director
(Biology) DipHort (Arb)
AILA
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.
© 2020 i
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, 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
DRAFT NOT FOR SUBMISSION PURPOSES
2.1 GENERAL 5
2.2 TOPOGRAPHY 5
2.3 VEGETATION 6
2.3.1 VEGETATION HAZARD CLASS 22.1 – MELALEUCA OPEN FORESTS ON SEASONALLY INUNDATED
LOWLAND COASTAL SWAMPS 8
2.3.2 VEGETATION HAZARD CLASS 39.2 – LOW TO MODERATE TREE COVER IN BUILT UP AREAS 9
2.3.3 VEGETATION HAZARD CLASS 41.4 – DISCONTINUOUS LOW GRASS OR TREE COVER 9
2.4 VEGETATION EXTERNAL OF THE 150M ASSESSMENT BUFFER 10
3 HAZARD ASSESSMENT 11
3.1 HAZARD ASSESSMENT METHODOLOGY 11
3.2 LOCAL HAZARD AREA MAP 12
3.3 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 20
5.1 GENERAL 20
5.2 ASSET PROTECTION ZONES 20
5.2.1 GENERAL 20
5.2.2 STATE PLANNING POLICY – STATE INTEREST GUIDANCE MATERIAL (NATURAL HAZARDS, RISKS AND
RESILIENCE – BUSHFIRE) DECEMBER 2019 20
5.2.3 RADIANT HEAT FLUX SETBACKS 21
5.3 WATER SUPPLY 21
5.4 FIRE BREAKS AND LOT 1 ACCESS 22
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 25
6.1 NOOSA PLAN 2020 – NATURAL HAZARDS OVERLAY CODE 25
6.2 STATE PLANNING POLICY – NATURAL HAZARDS, RISK AND RESILIENCE 29
7 CONCLUSIONS 30
7.1 CERTIFICATION MATTERS 30
8 REFERENCES 31
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
APPENDIX 1 – SITE LAYOUT 32
DRAFT NOT FOR SUBMISSION PURPOSES
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, 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 within Lot 101 on SP168341,
located at 9a Jirrima Crescent, Cooroibah (referenced hereafter as ‘the site’). The report was
requested to determine the suitability of a Reconfiguration of a Lot (1 into 2) development
application to be submitted to Noosa Shire Council.
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
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following Potential Bushfire Intensity areas:
• High Potential Bushfire Intensity area within the western extent of the site; and
• Potential Impact Buffer throughout most of the site, with the exception of the access
handle and adjoining area flanking the northern boundary.
Plate 1 – SPP Bushfire Intensity Mapping Overlay
1.3 Development Proposal
The applicant is seeking to subdivide the existing allotment into 2 Lots. Lot 1 is to be created in
the west of the site measuring approximately 1.82ha and contains areas of existing bushland
flanking the western boundary. A building envelope measuring approximately 2300m2 has been
proposed flanking the proposed eastern boundary. Driveway access is proposed to Lot 1 via an
access easement through proposed Lot.
Approximately 0.9ha of native bushland is proposed to be retained within Lot 1, corresponding
with the general extent of the intact bushland occurring to the west. The majority of the remaining
vegetation within Lot 1 will be cleared to accommodate the proposed development, access
requirements and bushfire setback requirements.
Lot 2 is located to the east, measuring approximately 2.63ha and contains an existing residence
and associated ancillary buildings.
Both Lots are to gain access from Jirrima Crescent via the existing access handle located to the
north-east. The Plan of Development is included as Appendix 1.
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
2 Site Description
2.1 General
The site exists in an area dominated by rural residential allotments on the western side of Lake
Cooroibah. The site measures approximately 4.46ha and has been historically cleared of
vegetation with the remaining vegetation described as a mix of regrowth wet heath and broad-
leaved paperbark open forest.
An existing dwelling is located within the north-east, gaining access to Jirrima Crescent via an
existing access handle flanking the northern boundary. Areas of maintained gardens exist
surrounding the dwelling which includes native regrowth occurring amongst mowed grassed
areas.
DRAFT NOT FOR SUBMISSION PURPOSES
Open grassy areas are present over a broad depression within the middle of the site and contain
a mix of regrowth wet heath and broad-leaved paperbark. A defined gully dissects the site from
north to south with adjacent areas corresponding with seasonally inundated floodplain conditions.
A culvert crossing provides access across the gully to the western portion of the site.
Areas of heathland exist flanking the western boundary and extend off site to the west.
Plate 2 details site conditions.
Plate 2 – Site Conditions (Source: Nearmap)
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 described as near flat (1º) and exhibits a western to northern aspect. The site reaches
a topographic high of 16m AHD about Jirrima Crescent in the east and a topographic low of 5.5m
AHD about the northern boundary in association with a defined gully line which dissects the site
from north to south and conveys overland flow in a northerly direction.. The central portion of the
site exhibits low topographic conditions with seasonal inundation apparent through the presence
of flora species suited to wetland conditions. Standing water was observed within these areas,
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
which generally corresponds to areas below 7.5m AHD. Plate 3 depicts topography conditions
within and adjacent to the site.
DRAFT NOT FOR SUBMISSION PURPOSES
Plate 3 – Site Topography (Source: NC Interactive Maps)
2.3 Vegetation
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 41.4 – Discontinuous low grass or tree cover.
The characteristics of each observed vegetation hazard class are described in the following
sections. Plan No. BF01 – Vegetation Hazard Classes depicts their distribution across the
assessment area.
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LEGEND
THE SITE
150M BUFFER TO ASSESSMENT AREA
VHC 22.1
Vegetation Hazard Class 22.1
VHC 22.1 VHC 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 41.4
Vegetation Hazard Class 41.4
Discontinuous low grass or tree cover
UNITS OF VEGETATION REMOVED
VHC 41.4 VEGETATION <50M WIDE HAVE BEEN REMOVED
VHC 22.1 AS PER THE PATCH AND CORRIDOR FILTERING PROCESS
(Leonard et. al (2017)
VHC 39.2
VHC 22.1
DRAFT NOT FOR SUBMISSION PURPOSES
VHC 22.1
VHC 41.4
VHC 22.1
VHC 41.4
VHC 39.2
VHC 39.2
VHC 41.4
VHC 41.4
0 15 30 45 60 75 (A1) 1:1500 150
Metres
(A3) 1:3000
PROJECT TITLE: CLIENT: TITLE: JOB: PLAN: REV: NORTH:
PO Box 9566 Pacific Paradise, Qld, 4564
P: 07 5450 5984
PROPOSED DEVELOPMENT MAUD CAZOT VEGETATION HAZARD CLASSES J000706 BF01 A
ABN: 60 625 108 625
AT 9A JIRRIMA CRESCENT, COOROIBAH A PRELIMINARY 28-10-2020 RC JL
COPYRIGHT © 2020 NCES. THIS DOCUMENT MAY NOT BE COPIED OR TRANSMITTED IN ANY FORM OR BY ANY
SCALE: 1:3000 @ A3
MEANS IN PART OR IN WHOLE WITHOUT THE WRITTEN CONSENT OF NCES.
ISSUE DETAILS DATE INIT CHK'D
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
2.3.1 Vegetation Hazard Class 22.1 – Melaleuca open forests on seasonally inundated
lowland coastal swamps
Vegetation Hazard Class 22.1 (VHC 22.1) exists throughout much of the site and is present as open
forest in the west and scattered regrowth vegetation within adjacent unmanaged areas.
Within the west VHC 22.1 exhibits an average canopy height of approximately 15m with a
percentage crown cover (PCC) of 30-40%. The canopy is dominated by Allocasuarina littoralis
(black she oak) and Melaleuca quinquenervia (broad leaved paperbark) with Eucalyptus racemosa
(scribbly gum) also occurring in lower densities.
The mid-storey contains wallum heathland and open forest species including Banksia integrifolia
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(coastal banksia), Banksia robur (swamp banksia), Acacia ulicifolia (prickly moses), Acacia
cincinnata (coil-pod wattle), Hakea actites (wallum hakea) and Persoonia virgata (wallum geebung).
The understory is predominantly comprised of native grasses such as Imperata cylindrica (blady
grass), Cymbopogon refractus (barb wire grass), Gahnia aspera (saw sedge) and Xanthorrhoea
johnsonii (grass tree).
VHC 22.1 occurs as scattered regrowth Melaleuca and Allocasuarina over an unmanaged grassy
understorey in the centre of the site. Due to past clearing the majority of midstorey species have
been removed with the understorey comprised of Cymbopogon refractus (barb wire grass) and
Imperata cylindrica (blady grass). Weeds such as Setaria sphacelata (South African pigeon grass)
occur as the dominant understorey species within wetter areas flanking the gully. No evidence of
recent management of this area was observed. If left unmanaged the scattered regrowth areas are
expected to redevelop into a dense Melaleuca open forest similar to that occurring in the west of the
site. Therefore VHC 22.1 has been assigned to both the scattered regrowth and open forest areas.
VHC 22.1 is attributed a potential surface fuel load of 23.4 t/ha and an overall fuel load of 28.4 t/ha
(QFES 2019) and is assigned a High Potential Bushfire Intensity class on level ground (Leonard et
al., 2017).
Plate 4-5 depicts typical conditions within VHC 22.1.
Plate 4 – Characteristic vegetation within VHC 22.2 (scattered regrowth)
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
DRAFT NOT FOR SUBMISSION PURPOSES
Plate 5 – Characteristic vegetation within VHC 22.2 (Open Forest)
2.3.2 Vegetation Hazard Class 39.2 – Low to moderate tree cover in built up areas
Vegetation Hazard Class 39.2 (VHC 39.2) occurs adjacent to the existing residence and surrounding
areas of moderate tree cover, typically with a cleared or mown understorey. Common canopy
species include E. racemosa (scribbly gum) and M. quinquenervia (broad leaved paperbark), L.
suaveolens (swamp brushbox), Eucalyptus latisinensis (white mahogany), Angophora leiocarpa
(rusty gum) and Pinus elliottii (slash pine).
In open areas the mid-storey is typically void due to past clearing with A. melanoxylon (blackwood)
and Glochidion ferdinandi (cheese tree) occurring at low densities. The understory is comprised of
a mix of mown grass species.
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). VHC 39.2 is assigned a Low Potential Bushfire Intensity class on flat ground
(Leonard et al., 2017).
Plate 6 depicts typical conditions within VHC 39.2.
Plate 6 – Characteristic vegetation within VHC 39.2
2.3.3 Vegetation Hazard Class 41.4 – Discontinuous low grass or tree cover
Vegetation Hazard Class 41.4 (VHC 41.4) occurs in the north east of the site and dominates the
lands immediately to the north and east of the site where a low density tree cover is present. This
VHC primarily consists of landscaped gardens and open paddocks with low density native trees and
regularly mown grass areas.
VHC 41.4 is attributed a potential total fuel load of 2 t/ha and a potential combined surface fuel load
of 2 t/ha (QFES, 2019). VHC 41.4 is assigned a Low Potential Bushfire Intensity class on flat ground
(Leonard et al., 2017).
Plate 7 depicts typical conditions within VHC 41.4.
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
DRAFT NOT FOR SUBMISSION PURPOSES
Plate 7 – Characteristic vegetation within VHC 41.4
2.4 Vegetation external of the 150m assessment buffer
The site flanks the eastern edge of a local north south aligned vegetated corridor. The corridor links
significant conservation areas surrounding the site including The Great Sandy National Park to the
north and Tewantin National Park and Noosa National Park to the south. Vegetation assemblages
include open forest and heathland communities, in addition to wetland areas flanking watercourses
and Lake Cooroibah to the west.
The site is exposed to a paperbark open forest fire run from the west in association with the
aforementioned vegetated corridor. Open forest fire runs are generally absent to the north, east and
south of the site with the surrounding vegetation, where present, described as scattered trees over
maintained understorey grasses. Risk of grassfire is present from the north, south and east and is
considered a function of grassland management frequency.
Plate 8 depicts the general extent of bushland habitat hence available forest fire zones surrounding
the site.
Plate 8 – Available fire runs (Source: Queensland Globe)
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, 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:
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• 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
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 a 3 x 3 grid comprised of 25m x 25m
individual 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 (refer Table 1);
• Application of 150m Potential Impact Buffers to the amended sub-units to derive an overall
Local Hazard Area Map.
Table 1: Potential Bushfire Intensity classes (Leonard et. al. 2017)
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: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
3.2 Local Hazard Area Map
The Vegetation Hazard Class Map; BF01 - Vegetation Hazard Classes has been presented in
Section 2.3
The sub-unit level Local Hazard Area Map is presented as Plan No. BF02 – Sub-Units and identifies
that the assessment area is host to a High Potential Bushfire Intensity area throughout much of the
site, with Low hazard areas existing to the east.
The overall Local Hazard Map is presented as Plan No. BF03 – Local Hazard Map and identifies
that the assessment area is host to a High Potential Bushfire Intensity area in the centre and west
of the site flanked by an associated Potential Impact Buffer. The new dwelling on Lot 2 is to be sited
in the existing High Potential Bushfire Intensity area. Note, post development the proposed building
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envelope and recommended Asset Protection will constitute low threat conditions by virtue of
necessary clearing hence would be located in a Potential Impact Buffer area. It is also likely
additional vegetation management would be re-established across the centre of the site amongst
the previously cleared areas now host to early phase regrowth hence the extent of the confirmed
High Potential Bushfire Intensity area about the BLE would likely be further eroded.
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.
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LEGEND
THE SITE
150M BUFFER TO SITE
LOW POTENTIAL BUSHFIRE INTENSITY
HIGH POTENTIAL BUSHFIRE INTENSITY
SUB
SUB UNIT 3
UNIT 1
SUB
UNIT 1 SUB
UNIT 1
DRAFT NOT FOR SUBMISSION PURPOSES
SUB
UNIT 2
SUB SUB UNIT HAZARD ASSESSMENT
UNIT 3
0 15 30 45 60 75 (A1) 1:1500 150
Metres
(A3) 1:3000
PROJECT TITLE: CLIENT: TITLE: JOB: PLAN: REV: NORTH:
PO Box 9566 Pacific Paradise, Qld, 4564
P: 07 5450 5984
PROPOSED DEVELOPMENT MAUD CAZOT SUB-UNIT LOCAL HAZARD MAP J000706 BF02 A
ABN: 60 625 108 625
AT 9A JIRRIMA CRESCENT, COOROIBAH A PRELIMINARY 28-10-2020 RC JL
COPYRIGHT © 2020 NCES. THIS DOCUMENT MAY NOT BE COPIED OR TRANSMITTED IN ANY FORM OR BY ANY
SCALE: 1:3000 @ A3
MEANS IN PART OR IN WHOLE WITHOUT THE WRITTEN CONSENT OF NCES.
ISSUE DETAILS DATE INIT CHK'D
Page 15
LEGEND
THE SITE
150M BUFFER TO SITE
LOW POTENTIAL BUSHFIRE INTENSITY
HIGH POTENTIAL BUSHFIRE INTENSITY
POTENTIAL IMPACT BUFFER
DRAFT NOT FOR SUBMISSION PURPOSES
0 15 30 45 60 75 (A1) 1:1500 150
Metres
(A3) 1:3000
PROJECT TITLE: CLIENT: TITLE: JOB: PLAN: REV: NORTH:
PO Box 9566 Pacific Paradise, Qld, 4564
P: 07 5450 5984
PROPOSED DEVELOPMENT MAUD CAZOT LOCAL HAZARD MAP J000706 BF03 A
ABN: 60 625 108 625
AT 9A JIRRIMA CRESCENT, COOROIBAH A PRELIMINARY 28-10-2020 RC JL
COPYRIGHT © 2020 NCES. THIS DOCUMENT MAY NOT BE COPIED OR TRANSMITTED IN ANY FORM OR BY ANY
SCALE: 1:3000 @ A1
MEANS IN PART OR IN WHOLE WITHOUT THE WRITTEN CONSENT OF NCES.
ISSUE DETAILS DATE INIT CHK'D
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
3.3 Quantitative Modelling
Quantitative modelling of the potential bushfire conditions that may be experienced within the
VHC 22.1 Melaleuca open forest within the site has been undertaken to gain an appreciation
of the severity of risk acting on the site including exposure to direct flame contact and radiant
heat. An understanding of the latter is used to determine the dimensioning of asset protection
zones to satisfy the SPP 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:
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• 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 populates standard bushfire
behaviour variables as well as the minimum distances required to achieve a range of different
radiant heat level exposures, including those which correspond with the range of Bushfire
Attack Levels (BAL’s) prescribed under AS 3959:2018 Construction of Buildings in Bushfire
Prone Areas.
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.
A FDI of 47 has been adopted for the site consistent with the assignment by QFES (Catalyst
2020) (refer Plate 9).
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
SITE
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Plate 9 – FFDI (Source: QFES Redi Map)
The Flamesol output result is shown in Plate 10.
Plate 10 – Flamesol output for VHC 22.1 (Melaleuca open forest on seasonally inundated lowland
coastal swamps) - 1º
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, 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 bushfire ember, radiant heat and/or flame attack considering the proximity to
bushfire prone vegetation and likely bushfire behaviour. Plate 11 illustrates the main bushfire
attack mechanisms acting on buildings.
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Plate 11 – 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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society will not accept this risk and measures are to be put in place to reduce
risks to at least a tolerable level.
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
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4.2 Risk from Identified Hazardous Vegetation
The proposed Lot 1 building envelope has been allocated a 14m cleared asset protection zone
to the VHC 22.1 occurring within the site.
The bushfire risk acting on the proposed building envelope, in the absence of additional
mitigation measures being implemented, is detailed in Table 2. The degree of separation
offered to the adjoining vegetation is the primary driver of the assigned level of risk.
Table 2 - Risk Assessment (Lot 1)
Direction & Slope North 1º South 1º East 1º West 1º
Distance to
14m 14m 14m 14m
hazardous vegetation
VHC’s 22.1 22.1 22.1 22.1
Attack Mechanism
Smoke* Not assessed Not assessed Not assessed Not assessed
Ember Likely - Likely - Likely - Likely -
Intolerable Intolerable Intolerable Intolerable
Radiant Heat** Likely Likely Likely Likely
Intolerable Intolerable Intolerable Intolerable
>1kW/m** >1kW/m** >1kW/m** >1kW/m**
Flame*** Likely - Likely - Likely - Likely -
Intolerable Intolerable Intolerable Intolerable
* Risk of smoke impact has not been assessed. Smoke can travel long distances and exhibit a variety of densities
and composition. It is therefore not readily practicable to determine the separation distances needed to attain the
various risk classes. Furthermore, individuals will react differently to smoke impacts whereas individuals will
generally exhibit similar reactions to direct flame and radiant heat.
**<1kW/m² radiant heat exposure is considered the upper limit of tolerable indefinite radiant heat exposure to
humans (QFES 2019).
*** Assets located within 1.5 x the modelled flame length from the Flamesol output are assigned an Intolerable
Risk.
Assets located within >1.5 - <3 x the modelled flame length from the Flamesol output are assigned a Tolerable
Risk.
Assets located >3 x the modelled flame length from the Flamesol output are assigned an Acceptable Risk.
Table 2 identifies that the building envelope located within Lot 1 is exposed to a Likely
Intolerable risk of ember, radiant heat, and direct flame impact in the absence of additional
mitigation measures being implemented. Post development it is anticipated that the risk will
be reduced to at least a tolerable risk via implementation of the bushfire planning mitigation
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measures prescribed in this report. A primary measure used to reduce the risk will comprise
compliance with the National Construction Code and AS3959 construction requirements for
dwellings located in bushfire prone areas. The dwelling will need to be built to the necessary
bushfire construction standard in order the withstand the AS3959 assessed level of flame
contact and radiant heat derived from the adjacent forest edge. This measure coupled with
maintenance of the necessary cleared setback to ensure the BAL construction standard
remains effective/valid is considered sufficient to reduce the assessed level of risk to at least
a tolerable to acceptable level thereby satisfying the QLD SPP State Interest Policy 2, that
developments in Bushfire Prone Areas are to be designed to achieve an Acceptable to
Tolerable level of risk, which is based on a risk assessment performed consistent with AS/NZS
ISO 31000:2018 Risk Management – Principles and Guidelines..
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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
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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 12 depicts the concept of an APZ surrounding a dwelling in a bushfire prone
areas.
Plate 12 – Asset Protection Zones
The development has been confirmed to be located within a bushfire hazard area hence
provision of adequate separation between the proposed Lot 1 building envelope and
surrounding hazardous vegetation is required to provide a reasonable level of safety to site
occupants and emergency services staff. The dimensioning requirements for APZ’s is set in
the State Planning Policy – State Interest Guidance Material (Natural Hazards, Risks and
Resilience – Bushfire) December 2019.
5.2.2 State Planning Policy – State Interest Guidance Material (Natural Hazards, Risks
and Resilience – Bushfire) December 2019
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, include a development
footprint plan that is separated from the closest edge to the adjacent medium, high or very
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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
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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
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supply to be left available for access by fire fighters:
i. 10,000 litres for residential buildings.
ii. for industrial, commercial and other buildings, a volume specified in AS 2304–2011
Water storage tanks for fire protection. (SPP Bushfire 2019).
5.4 Fire Breaks and Lot 1 Access
The plan of development provides access to proposed Lot 1 via an access easement to the
east which dissects Lot 2. To ensure safe egress to Lot 1 it is required that the future access
driveway be located within a 20m wide easement and constructed to the specifications of a
fire trail, to comply with the SPP Assessment Benchmark 4 Table 4 – Fire trail and working
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area design parameters specifications (refer Plate 13). The total modified width must be 20m
width within the High Potential Bushfire Buffer area and the Potential Impact Buffer as depicted
in Local Hazard Map BF03.
The entirety of the access easement must therefore be maintained in low threat conditions by
the future Lot 1 property owner.
Plate 13 – Assessment Benchmark 4 fire break trail specification
5.5 Vehicular Access
Development in bushfire prone areas should be serviced by safe access/exit points for both
occupants and emergency services personnel. As stated in Section 5.4, access to Lot 1 must
be maintained in a 20m wide easement constructed to SPP fire trail and working area design
parameters. This easement will be in favour of Lot 1 and therefore the maintenance of low
threat conditions undertaken by the Lot 1 property owner.
To meet current day benchmark standards, it is recommended the Lot 1 driveway is designed
and installed in accordance with Vehicle Access Guidelines for residential, commercial and
industrial Lots, Queensland Fire and Emergency Services, 2015, unless otherwise specified
by the relevant water entity. A 3.5m wide formed driveway that can support a 15 tonne fire
truck would therefore be necessary.
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:
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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
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;
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• The groundcover is maintained as short cropped grass to a nominal height of 100mm,
or dirt or gravel.
• Discrete plantings of low flammability groundcovers and shrubs is permissible at a
distance >10m from the dwelling;
• No trees are retained within 10m of the buildings;
• Beyond 10m, 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 3m 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 and or low-density plantings of suitable open forest /woodland
species with low bark shedding characteristics. Landholders should consult their local
native plant nursery for suitable species selection.
The APZ within Lot 1 is to be maintained by the respective 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.
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• 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.
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6 AUSTRALIAN STANDARD 3959:2018 CONSTRUCTION OF BUILDINGS IN
BUSHFIRE PRONE AREAS (AS 3959:2018) SETBACKS
The site is mapped within the Natural Hazards Overlay in the Noosa Plan 2020 (refer to Plate
13)
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Plate 13 – Noosa Natural Hazards Overlay map
Building works within Designated Bushfire Prone Areas identified on a Bushfire Hazard
Overlay Map prepared under a power of legislation triggers building design assessment under
AS 3959:2018. 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.
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 BLE
and is required to be assessed against the active iteration of the Standard at the time of
assessment.
Based on the Plan of Development and the proposed setbacks to hazardous vegetation of
14m, it is anticipated that the future dwelling on Lot 1 will be exposed to a maximum BAL 29
Construction Standard.
LEGISLATION AND OVERLAYS
6.1 Noosa Plan 2020 – Natural Hazards Overlay Code
The proposed development is considered assessable development and therefore is
assessable against Table 13.9 Bushfire Hazard Area of Council’s Natural Hazards Overlay
Code which has been reproduced as Table 5.
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Table 5 – Table 8.2.3.3 Bushfire Hazard Area Code –Noosa Plan 2020
PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
Safety of people and property
PO1 AO1.1 A01.1 This Bushfire Hazard Assessment and Management Plan has been
Development maintains the safety of people and Development which will materially increase the number of people living prepared to maintain the safety of people and property from the adverse impacts
property from the adverse impacts of bushfire. or congregating on premises, including reconfiguring a Lot, is not located of bushfire. Post development, the proposed Lot 1 BLE will be located within a
within a medium or high bushfire hazard area. Potential Impact Buffer .
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AO1.2
A01.2 The proposed Lot 1 BLE has been setback a minimum of 14m from all
Development maximises setbacks from hazardous vegetation to achieve
hazardous vegetation areas. With the implementation of the recommendations of
an acceptable risk.
this report it is anticipated that the risk to the Lot 1 building envelope will be
reduced to no greater than a tolerable risk thereby satisfying the SPP State Interest
Editor’s Note — PSP8 Natural Hazards provides guidance for assessing
Policy No 2.
bushfire hazard risk and preparing a bushfire hazard management plan.
Impacts on Ecologically Important Areas
PO2 PO2
Bushfire mitigation measures do not adversely impact No acceptable outcome provided 1. Bushfire mitigation measures are not expected to affect the biodiversity values
on: currently existing within the site. A small amount of regrowth vegetation will be
required for removal to develop the BLE and APZ requirements. This is not
1. biodiversity values, connectivity and expected to affect the long term physical integrity and function of the local
ecosystem functioning; and regional ecosystem.
2. the long term physical integrity of 2. Bushfire mitigation measures are not expected to affect the long term physical
waterways, wetland and areas of integrity of waterways, wetlands and areas of native vegetation.
native vegetation.
Water Supply for Fire Fighting Purposes
PO3 AO3.1 A03.2 – The site will not be connected to a reticulated water supply. Water
Development provides an adequate water supply for fire Premises are connected to the reticulated water supply. supply recommendations have been set herein consistent with SPP Assessment
fighting purpose which is reliable, safely located and Benchmark water supply requirements.
freely accessible. Editor's note—For reconfiguring a Lot, water supply needs to provide for
a minimum flow and pressure of 10 litres a second at 200kPa at all times
for fire fighting purposes.
OR
AO3.2
Where there is no available reticulated water supply, the premises has:
1. an accessible dam, swimming pool or water tank available
for fire fighting purposes with an onsite water volume of not
less than 5,000 litres; and
2. 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).
Editor’s Note—Water supply capacity for fire fighting purposes is in
addition to water supply capacity for other uses and activities on the
premises.
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PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
Essential Community Infrastructure
PO4 AO4.1 PO4 - The proposed development does not involve essential community
Essential community infrastructure is able to function Development involving essential community infrastructure is not located infrastructure.
effectively during and immediately after bushfire events. within a medium or high bushfire hazard area.
OR
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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 Materials
PO5 AO5 PO5 - 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 bushfire of hazardous materials in bulk.
affected by the impacts of bushfire on hazardous hazard area.
materials manufacturing or storing in bulk.
Access and Evacuation Routes
PO6 AO6.1 PO6 - N/A – No new roads are proposed.
Roads provide for easy and safe evacuation of residents The road layout provides for through-roads and avoids cul-de-sacs and
of premises and access by emergency services. dead-end roads.
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.
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 A07
Lot design and building siting minimises bushfire hazard Each residential Lot:
risk to people and property.
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PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
1. includes a building envelope, identified on a plan of 1. The plan of development depicts the location of the new building envelope
subdivision; proposed for Lot 1.
2. is of sufficient size and shape to allow for efficient 2. The proposed BLE is of sufficient size and shape to allow for efficient
emergency access to buildings for fire fighting appliances emergency access. It is proposed that a fire trail of 20m width be established
(e.g. by avoiding battle-axe/hatchet Lots and long narrow covering the Lot 1 access driveway and be constructed to the Vehicle Access
Lots with long access driveways to buildings); Guidelines for residential, commercial and industrial Lots, Queensland Fire and
Emergency Services, 2015, therefore allowing emergency access and exit for
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firefighting purposes.
3. where more than 2500m², achieves setbacks from 3. The Lot 1 BLE has been setback 14m from areas of hazardous vegetation
hazardous vegetation in line with Bushfire Attack Level 29 through the inclusion of a 14m wide APZ. This setback will expose the future
requirements as per AS3959; and dwelling to a maximum BAL 29 under AS3959; and
4. The Lot 1 BLE has been sighted to the east of the intact bushland areas to be
4. is designed so that buildings and structures are sited in
retained within the lowest hazard area within the Lot.
locations of lowest hazard within the Lot and elements of the
development least susceptible to fire are closest to the fire
hazard.
Firebreaks and fire access tracks
PO8 AO8.1 A08.1 – No new roads are proposed.
Firebreaks and fire access tracks provide: Where development involves the creation of a new road and Lots,
a firebreak is provided by providing a cleared road reserve not less than
1. adequate access for fire fighting and other 20 metres wide and maximum gradient of 12.5% around the perimeter of
emergency vehicles; and the subdivision, between the created Lots and surrounding vegetated
2. adequate access for the evacuation of lands.
residents and emergency personnel in an
emergency situation. OR
AO8.2 A08.2 – A fire access track to SPP Bushfire 2019 standards is to be provided to
Fire access tracks are provided between the created Lots and the dwelling on proposed Lot 1 and its associated asset protection zone thereby
surrounding vegetated land that: offering ready access to the vegetation hazard surrounding the Lot 1 building.
1. have a cleared minimum width of 6 metres;
2. have a maximum gradient of 12.5%;
3. provide unbroken access for fire fighting vehicles;
4. provide passing bays and turning areas;
5. 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 A08.3 – All prescribed bushfire management measures herein can be applied
and not any adjoining property. within Lot 1 and do not rely on Lot 2 or adjoining properties.
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6.2 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
Where reconfiguring a Lot creating Lots of greater than 2000 square metres
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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.
The Lot 1 building envelope has been allocated a 14m wide asset protection zone to the surrounding
VHC 22.1 hazard which is sufficient to achieve <29 kW/m² radiant heat flux acting on the building.
Safe evacuation is to be granted to Lot 1 through the provision of a 20m wide fuel modified fire trail
(inclusive of the driveway) contained within the Lot 1 easement and therefore satisfies the
Assessment Benchmark 4 criteria.
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.
The development is positioned on a flat coastal plain and therefore complies with Assessment
benchmark 5.
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,
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 Bushfire Management Plan has prescribed management measures for the APZ’s recommended
for proposed Lot 1 which complies with Assessment Benchmark 7.
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7 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 Reconfiguration of a Lot
development application for Lot 101 on SP168341, located at 9a Jirrima Cres, 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 the proposed Lot 1 development footprint is located within a High Potential
Bushfire Intensity Area whilst the existing residence in Lot 2 is located within a Potential Impact
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Buffer Area. Post development the proposed Lot 1 development footprint will located within a
Potential Impact Buffer Area.
A bushfire risk assessment has been undertaken in general accordance with AS/NZS ISO
31000:2018 – Risk Management Methodology. The risk assessment identified that vegetation
to be retained 14m from the proposed Lot 1 BLE exposes the future building to a pre
development Likely - Intolerable risk of ember, radiant heat and direct flame impact in the
absence of additional mitigation measures being employed. The identified risk can be reduced
to at least a Likely – Tolerable to Acceptable level where all recommendations set herein are
adopted thereby satisfying the State Planning Policy – State interest guidance material –
Natural hazards, risk and resilience – Bushfire (December 2019).
Overall, the development proposed for the site, in combination with recommendations
referenced herein, is deemed to satisfy both the Noosa Plan Natural Hazards Overlay Code
and the State Planning Policy – State interest guidance material – Natural hazards, risk and
resilience – Bushfire (December 2019) development assessment benchmarks.
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’.
7.1 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, fire break trails, landscaping etc.) where practical at the
time of certification.
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
8 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.
DRAFT NOT FOR SUBMISSION PURPOSES
The Noosa Plan (2020). Bushfire Hazard Area 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.
Queensland Fire and Emergency Services. (2015). Vehicle Access Guidelines for residential,
commercial and industrial Lots.
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.
© 2020 31
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Bushfire Hazard Assessment & Management Plan v1 NCES REF: J000706
Lot 101 on SP168341 – 9a Jirrima Cres, Cooroibah
APPENDIX 1 – SITE LAYOUT
DRAFT NOT FOR SUBMISSION PURPOSES
© 2020 32
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DRAFT NOT FOR SUBMISSION PURPOSES
10 . 5
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–
MURRAY &
ASSOCIATES
SURVEYORS & TOWN PLANNERS ACN 075 543 154
Murray Building,15-17 Currie St. Nambour Ph.(07)5441 2188 P.O. Box 246
Branch Offices at Caboolture Chinchilla Roma Gympie & Emerald
Page 35
2*
30
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pip
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SP179878
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DRAFT NOT FOR SUBMISSION PURPOSES
INSET OF WESTERN END OF ACCESS pool
100
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NOT FOR
CONSTRUCTION
CERTIFIED BY:
INSET OF OVERALL LOT
RPEQ No.: 13201 (Allister Haynes)
DATE: 6/3/2020
PSM No -
HAYNES CONSULTING ENGINEERS PRELIMINARY ACCESS
(AHD) RL -
ABN 53 613 630 078 LOT 101 SP168341, 2 LOTS 1803
SURVEYED -
PO BOX 549 NOOSA HEADS QLD 4567 9A JIRRIMA CRESCENT, COORIOBAH, CLIENT: MAUD CAZOT Sheet No. - Revision No.
A 6-3-20 FOR COUNCIL RECONFIGURATION ATH
Rv DATE REVISIONS APPR.
(0432) 784 150
SITE PLAN S1 A