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Appendix B - Bushfire Hazard Assessment
BUSHFIRE HAZARD ASSESSMENT
MATERIAL CHANGE OF USE TO ESTABLISH SHORT TERM ACCOMODATION
157 LAWNVILLE ROAD, BLACK MOUNTAIN
LOT 83 ON MCH3546
52A Park Rd Nambour QLD 4560 / Ph: 0428 221 983 / Email: [email protected]
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TABLE OF CONTENTS
1.0 INTRODUCTION......................................................................................1
1.1 PURPOSE......................................................................................................................................1
1.2 ASSESSMENT AREA .......................................................................................................................1
1.3 NOOSA COUNCIL BUSHFIRE HAZARD OVERLAY.................................................................................3
1.4 STATE PLANNING POLICY BUSHFIRE HAZARD OVERLAY .....................................................................4
1.5 SURROUNDING LAND USES ............................................................................................................4
1.6 TOPOGRAPHY ...............................................................................................................................5
1.7 VEGETATION ................................................................................................................................7
2.0 BUSHFIRE HAZARD ASSESSMENT ..........................................................10
2.1 STATE ASSESSMENT METHODOLOGY ............................................................................................ 10
2.1.1 General ....................................................................................................................... 10
2.1.2 Vegetation Hazard Classes ....................................................................................... 10
2.1.3 Maximum Landscape Slope ...................................................................................... 10
2.1.4 Fire Danger Index ...................................................................................................... 11
3.0 LOCAL HAZARD MAP ............................................................................12
3.1 GENERAL .................................................................................................................................... 12
3.2 PATCH AND CORRIDOR FILTERING ................................................................................................ 12
3.3 CALCULATION OF POTENTIAL BUSHFIRE INTENSITY ........................................................................ 13
4.0 CONCLUSION ...................................................................................17
5.0 REFERENCES ...................................................................................18
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Disclaimer
This assessment has been prepared by Equilibrium Ecology Pty Ltd and may only be used and relied upon for the purposes set
out in this report. No responsibility is held to any person other than the Client for any decision or action arising from or in
connection with this report. All opinions and conclusions are based on assumptions detailed in this report and no responsibility
is held for any error or omission arising from these assumptions being incorrect.
This assessment has been based on site conditions present at the time of preparation and are relevant to the nature of the
development proposed. The assessment relies on current bushfire hazard assessment methodologies as described in this
report. These methodologies may not consider catastrophic bushfire events which may occur from time to time. By their
nature, bushfires are unpredictable, and no guarantee can be provided or should be assumed that the area will not be affected
by bushfire at some time. Landowners/occupants should be aware of the unpredictable nature of bushfire and potential
consequences of such events and should be responsible for their property and occupants by being prepared for extreme events
accordingly.
To the extent permitted by law, Equilibrium Ecology Pty Ltd 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 report (in part or whole) and any information or material contained in it.
Document Issue
Version Number Date Authorised for Issue
1 1 NOVEMBER 2022 N. Willis (B. Sc., Dip. CLM., mAABR,
mEIANZ, mFPAA) – Director/Principal
Ecologist
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1.0 INTRODUCTION
1.1 PURPOSE
This Bushfire Hazard Assessment Report has been prepared to assess the degree of bushfire hazard and
associated risk acting on the proposed development area within Lot 83 on MCH3546 located at 157
Lawnville Road, Black Mountain (herein referred to as ‘the site’). The applicants are seeking an approval
for a Development Permit for Material Change of Use to establish short term accommodation in the form
of four new cabins to be built on the premises. A Site Plan has been provided as Appendix A. This
assessment has been undertaken to determine the specific extent of bushfire hazard acting on the
proposed development.
The following documents prescribe the bushfire assessment measures utilised in Queensland and have
been drawn upon in the preparation of this report:
Natural Hazards, Risk and Resilience –– Bushfire State Planning Policy – state interest guidance
material (The Department of Infrastructure, Local Government and Planning, 2019)
Bushfire Resilient Communities. Technical Reference Guide for the State Planning Policy State
Interest ‘Natural Hazards, Risk and Resilience - Bushfire’ (Queensland Fire and Emergency Services
(QFES), 2019)
1.2 ASSESSMENT AREA
QFES (2019) defines the assessment area as the development footprint and all land within 150m of the
extent of the development footprint. The site is located within a semi-vegetated rural area and covers
approximately 4.19ha. The site is currently improved with a dwelling house, sheds and other associated
infrastructure in the western site extent. Six Mile Creek traverses through the centre of the site. The site
is characterised by generally cleared areas supporting pasture grass, with narrow bands of vegetation
flanking the creek and along the external site boundaries. Semi-vegetated rural allotments dominate the
landscape surrounding the site. Plate 1 depicts the existing site conditions within the assessment area.
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Plate 1: Assessment Area (Source: QLD Globe)
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1.3 NOOSA COUNCIL BUSHFIRE HAZARD OVERLAY
The proposed development area is within a mapped Medium Potential Bushfire Intensity area and
associated Potential Impact Buffer area under the Noosa Plan 2020 (refer to Plate 2).
Plate 2: Noosa Plan 2020 Bushfire Hazard Overlay (Source: Noosa Intramaps)
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1.4 STATE PLANNING POLICY BUSHFIRE HAZARD OVERLAY
The proposed development area is within a mapped Medium Potential Bushfire Intensity area and
associated Potential Impact Buffer area under the State Planning Policy Bushfire Hazard Overlay (refer to
Plate 3).
Plate 3: State Planning Policy bushfire hazard mapping (Source: SPP Mapping)
1.5 SURROUNDING LAND USES
The site is located within a rural landscape characterised by mixed land uses containing a mosaic of cleared
and vegetated areas. Dominant land uses include livestock grazing and rural-residential hobby farms on
cleared areas, with smaller areas of native vegetation retained on steeper areas and drainage lines.
Surrounding land uses are depicted in Plate 4.
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Plate 4: Surrounding Land Uses (Source: QLD Globe)
1.6 TOPOGRAPHY
The site is located on the alluvial floodplain associated with Six Mile Creek which is located in a narrow
valley between adjoining hillsides. Only minor topographical variation is experienced within the site,
which rises in the west and east to a topographical high of approximately 125m AHD and descends to a
low point of approximately 119m AHD at Six Mile Creek. Plates 5 & 6 depict topography conditions
surrounding the site.
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Plate 5: Topography/ Hill Shade (Source: QLD Globe)
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Plate 6: Topography (Source: Noosa Council Intramaps)
1.7 VEGETATION
A site assessment was undertaken on 27 October 2022. One dominant vegetation unit was recorded
within the 150m assessment area surrounding the proposed development area. The narrow band of
vegetation flanking Six Mile Creek is characterised by tall Eucalyptus grandis (flooded gum) over
Waterhousea floribunda (weeping satinay). The canopy has attained a height of over 30m. Other species
observed include Corymbia intermedia (pink bloodwood), E. tereticornis (Queensland blue gum) and the
exotic weed species Cinnamomum camphora (camphor laurel). The vegetation community is analogous
with Vegetation Hazard Class 8.1 (VHC 8.1) which is described as Wet Eucalypt tall open forest (QFES,
2019). Plate 7 depicts typical conditions within the narrow band of vegetation flanking Six Mile Creek.
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Plate 7: VHC 8.1 flanking Six Mile Creek in the centre of the site
Narrow bands of vegetation also occur within the road reserve of both Evans Road and Lawnville Road
which adjoin the site. The canopy has attained a height of greater than 30m and is dominated by
Eucalyptus tereticornis (Queensland blue gum), E. grandis (flooded gum), Corymbia intermedia (pink
bloodwood), Lophostemon suaveolens (swamp box) and Cinnamomum camphora (camphor laurel). The
mid-storey and understorey are dense and contain a range of commonly occurring regrowth vineforest
pioneer species and Acacia disparrima (hickory wattle). The vegetation community is analogous with
Vegetation Hazard Class 8.1 (VHC 8.1) which is described as Wet Eucalypt tall open forest (QFES, 2019).
Plate 8 depicts typical conditions within the narrow bands of vegetation within the road reserve parcels
adjoining the site.
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Plate 8: VHC 8.1 in the road reserves adjoining the site
The remainder of the vegetation within the 150m assessment area was low threat mowed/slashed grass
with low density woody vegetation associated with the adjoining rural residential allotments. This
vegetation unit is analogous with Vegetation Hazard Class 40.4 (VHC 40.4) which is described as
Continuous low grass or tree cover (QFES, 2019).
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2.0 BUSHFIRE HAZARD ASSESSMENT
2.1 STATE ASSESSMENT METHODOLOGY
2.1.1 General
The Noosa Plan 2020 requires a site-specific bushfire hazard assessment to be undertaken when a
development site is located within a mapped Bushfire Hazard Area.
The State government have described the methodology used to prepare the SPP mapping in the following
publications:
Natural Hazards, Risk and Resilience –– Bushfire State Planning Policy – state interest guidance
material (The Department of Infrastructure, Local Government and Planning, 2019)
Bushfire Resilient Communities. Technical Reference Guide for the State Planning Policy State
Interest ‘Natural Hazards, Risk and Resilience - Bushfire’ (Queensland Fire and Emergency Services
(QFES), 2019)
QFES, 2019 states that although state-wide bushfire prone area mapping is regularly updated, land use
and vegetation cover (key contributors to bushfire hazard) are subject to change, particularly regarding
the extent of hazardous vegetation. Accordingly, the first step of a bushfire hazard assessment is to
undertake a reliability assessment to determine whether the site’s observed characteristics are consistent
with the inputs used to create the mapping and the mapping outputs. A reliability assessment is therefore
undertaken for the site and all land within 150 metres of the proposed development.
The preparation of a Local Hazard Area Map has been undertaken for the site in accordance with the
methodology described in the above referenced documents. The input parameters used to determine the
bushfire hazard acting on the site are detailed in the sections below.
2.1.2 Vegetation Hazard Classes
Fuel loads need to be determined when preparing a bushfire hazard assessment. The QFES refers to the
process for identifying, classifying and mapping vegetation hazard classes as a Vegetation Hazard Class
Assessment. In accordance with the methodology outlined in Section 6 of the Bushfire Resilient
Communities (QFES, 2019), the following Vegetation Hazard Classes (VHC) were identified within the
assessment area (which includes a 150m buffer surrounding the proposed build location):
VHC 8.1 – Wet Eucalypt Tall Open Forest – which is attributed a combined surface/near-surface
fuel of 31t/ha and a total potential fuel load of 35t/ha (non-remnant)
VHC 40.4 – Continuous low grass or tree cover – which is attributed a combined surface/near-
surface fuel of 4.5t/ha and a total potential fuel load of 5t/ha
2.1.3 Maximum Landscape Slope
The slope of the land is a major determinant of fire behaviour. Fire burns faster as it travels up a slope,
via the 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
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the rate of spread. As a general rule, the rate of fire spread (and fireline intensity) doubles up a 10-degree
slope and quadruples up a 20-degree slope (QFES,2019).
The land to the south, east and west of the development area is located upslope of the site. The land to
the north is located across slope or on low grades of less than 1 degree. Where the slope under hazardous
vegetation is located across slope, it is considered ‘upslope’ irrespective of the slope of land between the
site and the edge of the hazardous vegetation. Note that for the purposes of undertaking a bushfire hazard
assessment, where the topography is flat or where vegetation is located upslope of an assessment site, a
slope of 1 degree is required to be used to satisfy the mathematical formula, however it has negligible
impact on the calculations.
2.1.4 Fire Danger Index
The Queensland government produce a publicly available data package which includes selected inputs
and information used by the CSIRO in conjunction with the QFES to prepare the State-wide Bushfire
Hazard Area (Bushfire Prone Area) mapping (July 2014). The data includes Fire Weather Severity (Fire
Danger Index - FDI). A review of the dataset for the assessment area indicates that the site is located
within a band of FDI 47.
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3.0 LOCAL HAZARD MAP
3.1 GENERAL
The SPP reference documentation sets out the following methodology for preparing a Local Hazard Area
Map:
Categorising the vegetation within the site in accordance with the vegetation hazard classes
derived from QFES (2019) (Refer to Figure 1)
Using the patch and corridor filtering process to remove narrow corridors and small patches of
hazardous vegetation (Refer to Figure 1)
Subdividing the identified vegetation hazard classes into bushfire hazard sub-units based on
slope differences and vegetation hazard classes (Refer to Figure 2)
Assigning SPP Potential Bushfire Intensity classes to the sub-units (Refer to Figure 2)
Application of 100m Potential Impact Buffers to the amended sub-units to derive an overall Local
Hazard Map (Refer to Figure 3)
3.2 PATCH AND CORRIDOR FILTERING
Section 4.2.6 of Bushfire Resilient Communities (QFES, 2019) outlines the patch and corridor filtering
process to modify potential intensity of small patches and corridors (based on Leonard et. al. 2017). The
process involves the following four stages:
Remove small, isolated patches of a single Vegetation Hazard Class less than 1ha if they are
further than 100m from any other continuous fuel greater than 2 hectares in size
Downgrade the intensity of small patches (0.5 to 3 ha). This process downgrades the effective
fuel load of continuous vegetation patches 0.5 to 2ha by 66%, and 2 to 3ha by 50% if they are
completely surrounded by either no fuel or by discontinuous fuel further than 100m from any
other continuous-fuel vegetation patch greater than 2 hectares in size
Removing narrow corridors of vegetation less than 50m wide. 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.
Removing small patches of vegetation less than 0.5ha. 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
In this assessment, all VHC 8.1 vegetation units within the assessment area consist of narrow units of
vegetation which are less than 50m in width. In this regard, they have been merged with the surrounding
VHC 40.4 vegetation which adjoins the patch boundary of the VHC 8.1.
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3.3 CALCULATION OF POTENTIAL BUSHFIRE INTENSITY
The Potential Bushfire Intensity of each identified sub-unit has been calculated by inputting the site-
specific input parameters discussed in Section 2.1 into the FLAMESOL computer model. FLAMESOL uses
industry standard bushfire equations and allows numerous input variables to be adjusted including fuel
loads, fire danger index, site slope and distance to vegetation. 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
POTENTIAL BUSHFIRE INTENSITY POTENTIAL FIRELINE INTENSITY
Very High >40,000 kW/m
High 20,000-39,999 kW/m
Medium 4,000 – 19,999 kW/m
Low <4,000 kW/m
Figures 1-3 are presented below and have been prepared as per the above referenced methodology.
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BUSHFIRE HAZARD ASSESSMENT 157 LAWNVILLE ROAD, BLACK MOUNTAIN FIGURE 1 VEGETATION HAZARD CLASSES =| [LEGEND 157 LAWNVILLE ROAD, BLACK MOUNTAIN — x J 150m ASSESSMENT BUFFER is VHC 8.1 - WET EUCALYPT TALL OPEN FOREST E |__| vic 40.4 - continuous Grass or TREE COVE | |E"""7 UNIT REMOVED VIA PATCH FILTERING PROCESS R , | COPYRIGHT © 2022 N
Page 18
BUSHFIRE HAZARD ASSESSMENT Sub Unit 1 - VHC 40.4 157 LAWNVILLE ROAD, BLACK MOUNTAIN Combined . . . . Maximum Potential Potential Fire Danger| Surface and | Total Fuel Landscape Fireline Fireline Index (FDI) | Near Surface Load Slo * Intenst Intensi Fuel Load P ty ay 47 4.5 t/ha 5 t/ha 1 degree 702 kw/m FIGURE 2 HAZARD SUB-UNITS LEGEND 157 LAWNVILLE ROAD, BLACK MOUNTAIN 1] 150m ASSESSMENT BUFFER [DD] tow porenriat BUSHFIRE INTENSITY COPYRIGHT © 2022
Page 19
BUSHFIRE HAZARD ASSESSMENT 157 LAWNVILLE ROAD, BLACK MOUNTAIN $ FIGURE 3 MH | LOCAL HAZARD MAP LEGEND |] 157 LAWNVILLE ROAD, BLACK MOUNTAIN 4 150m ASSESSMENT BUFFER [9] cow porentiat BusHFIRE INTENSITY COPYRIGHT © 2022
Page 20
4.0 CONCLUSION
A bushfire hazard assessment has been completed for the proposed development area within Lot 83 on
MCH3546 located at 157 Lawnville Road, Black Mountain. A Local Hazard Map has been prepared for the
site consistent with the State Planning Policy – Natural Hazards, Risk and Resilience – Technical Manual.
The Local Hazard Map has identified that the proposed development area and majority of the surrounding
landscape is located within a Low Potential Bushfire Intensity Area. As per the specifications of the State
Planning Policy, if a site-specific bushfire hazard assessment results in the site being contained within a
Low Hazard Area, no further action is required as the provisions of the Bushfire Hazard Overlay do not
apply.
Bushfire can be unpredictable and requires adequate preparatory planning and actions to be undertaken
to minimise impacts to property and potential loss of life. This assessment has been prepared with
consideration of site conditions observable at the time of inspection, the distance between the proposed
development and potentially hazardous vegetation, the extent of fragmentation occurring within the
landscape and the nature of the development proposed. The hazard assessment methodologies
described in this report are not based on assessments of catastrophic bushfire events which may occur
from time to time. The unpredictable nature of bushfires prevents any guarantee being provided that the
area will not be affected by bushfire at some time. Property owners and site users should be aware of the
potential consequences of such events and should take responsibility for the protection of property and
personnel accordingly.
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5.0 REFERENCES
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 Plan 2020 - Bushfire hazard overlay code and PSP8 Planning scheme policy for Natural Hazards.
Noosa Shire 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.
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.
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APPENDIX A – SITE PLAN
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LEGEND
N
PROPOSED NEW 4000
x 13600 CABINS
WATERWAYS
00 PROPOSED ACCESS
7.
12 TO CABIN 2
126.00
STAGING 12
5.0
0
0 EV
STAGE 1 - CABINS 1 & 2
PROPOSED ACCESS
R OAD 124.0 AN
TO CABINS 3 & 4 NS 209 SR
EVA
00
° OA
3.
99. 35' D
12
00
01
STAGE 2 - CABINS 3 & 4 DAM
150
00'
00
172° 3 PROPOSED
2.
12
201.8
1500
SEPTIC TANK
PROPOSED ACCESS
. 00
1
0
TO CABIN 1
12
PROPOSED ADVANCED
CABIN 2
9.0 00
0
21 SECONDARY ASTP
00
11 120.
8
0
15
41 °9'
2600
.92
OVERHEAD CABIN 3
0
POWERLINES TO 11
00
BE REALIGNED 0
CABIN 4
PP PROPOSED SURFACE
IRRIGATION AREA
119
.00 CABIN 1
15000
7 32
38 LOT 83 LOT 21
MCH3546 RP905958
119.
00 4.19 Ha
LA
PROPOSED ADVANCED
W
SECONDARY ASTP
110 00'
NV
258
119.00
.03
PROPOSED SURFACE
13 ° 57
DAM
°
I LL
64
0.0 '
IRRIGATION AREA
ER
7
11
9.
OA
PP
00
D
EXISTING DWELLING
0
9.0
11
EXISTING
SHED
120.00
EXISTING EXISTING
DRIVEWAY SHED
289.06
7°15'
119.00
120.00
12 12 12
120
118 1.0
2.
.00 3.0
00
0 0
.00
NOTES
TOPOGRAPHY
INDICATIVE ONLY AS EXISTING ACCESS POINT
LAWNVILLE ROAD
PROVIDED BY NOOSA
REGIONAL COUNCIL
INTERACTIVE MAPPING
REV DESCRIPTION DATE
MCLARENDESIGN
MCLAREN PTY LTD
A CONCEPT 03/11/2022 MATTHEW MCGEE SITE PLAN
B AMENDMENTS 08/05/2023
QBCC Licence: 15022752 P 07 5417 4251 M 0418 234 571 PROPERTY DESCRIPTION: LOT 83 ON MCH3546
1A 22 Reef Street Gympie Q 4570 www.mclarendesign.com.au
PO BOX 718 Gympie Q 4570
PROPOSED CABINS DATE 03/11/2022 PROJECT NO: 22-168
DESIGNED BY LRM
© Copyright
Reproduction in part or
ALL DESIGN, CONSTRUCTION & MATERIALS TO BE IN ACCORDANCE WITH:
THE NATIONAL CONSTRUCTION CODE (NCC): THE BUILDING CODE OF AUSTRALIA (BCA): THE QUEENSLAND DEVELOPMENT
whole is forbidden without CODE (QDC) BUILDING REGULATIONS & LOCAL GOVERNMENT PLANS & POLICIES: CURRENT ISSUES OF AUSTRALIAN
157 LAWNVILLE ROAD, BLACK DRAWN BY LS A3 01
written permission
STANDARDS CURRENT MANUFACTURER'S SPECIFICATIONS & INSTALLATION DETAILS FOR MATERIAL USED
NOTE: ALL DIMENSIONS IN MILLIMETRES UNLESS OTHERWISE NOTED & MUST BE VERIFIED ON SITE
MOUNTAIN APPROVED BY Scale 1 : 1000