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Bushfire Hazard Management Plan v3 - 27 Wilgee Ct Cooroy
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Log in to see the plans as drawn BUSHFIRE HAZARD MANAGEMENT PLAN v3
LOT 101 ON SP142407, LOT 140 ON MCH978, LOT 3 ON RP137375,
LOT 2 ON RP852009 AND LOT 8 ON RP160703
27 WILGEE COURT
COOROY
FOR
SUNSHINE BEACH CONSTRUCTION PTY LTD
AUGUST 2020
PO Box 9566 Pacific Paradise QLD 4564 / Email: [email protected]
ABN 60 625 108 625
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
DOCUMENT CONTROL
Document: Bushfire Hazard Management Plan
Client: Sunshine Beach Construction Pty Ltd
Project Number: J000410
Project: Reconfiguration of a Lot (5 into 15)
Site: Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375, Lot 2 on
RP852009 and Lot 8 on RP160703
27 Wilgee Court, Cooroy
Version Date Distribution Author/s Approver
1 20/06/2019 Jack Lewis – Pivotal N. Willis (B. Sc., Dip. CLM, Joshua Lee - Director
Perspective mAABR) – Principal (B. Sc., mEIANZ,
Ecologist mFPAA, mESA)
2 27/06/2019 Jack Lewis – Pivotal N. Willis (B. Sc., Dip. CLM,
Perspective mAABR) – Principal
Ecologist;
Joshua Lee - Director
(B. Sc., mEIANZ, mFPAA,
mESA)
3 27/08/20 Jack Lewis – Pivotal N. Willis (B. Sc., Dip. CLM,
Perspective mAABR) – Principal
Ecologist;
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 Management Plan v3 NCES REF: J000662 Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375, Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy Table of Contents 1 INTRODUCTION 1 1.1 BACKGROUND 1 1.2 DEVELOPMENT PROPOSAL 1 1.3 BUSHFIRE HAZARD AREA MAPPING – NOOSA PLAN 2006 1 1.4 BUSHFIRE HAZARD OVERLAY MAPPING – NOOSA PLAN 2019 2 1.5 STATE PLANNING POLICY 2 2 SITE DESCRIPTION 4 2.1 GENERAL 4 2.2 TOPOGRAPHY 4 2.3 VEGETATION 5 2.3.1 VEGETATION HAZARD CLASS 02 – OPEN FORESTS / WOODLANDS - SHRUBBY 8 2.3.2 VEGETATION HAZARD CLASS 08 – ACACIA COMMUNITIES 8 2.3.3 VEGETATION HAZARD CLASS 12 – MIXTURE OF RURAL CLASSES – MAINLY GRASSLAND 8 2.3.4 VEGETATION HAZARD CLASS 16 – MIXTURE OF URBAN CLASSES 9 2.4 VEGETATION EXTERNAL OF THE 100M ASSESSMENT BUFFER 9 3 BUSHFIRE HAZARD ASSESSMENT 11 3.1 HAZARD ASSESSMENT METHODOLOGY 11 3.2 LOCAL BUSHFIRE HAZARD MAPPING 11 3.3 QUANTITATIVE MODELLING 14 4 BUSHFIRE RISK ASSESSMENT 17 4.1 GENERAL 17 4.2 RISK FROM HAZARDOUS VEGETATION WITHIN THE SITE 17 4.3 RISK FROM HAZARDOUS VEGETATION EXTERNAL OF THE SITE 18 5 BUSHFIRE MANAGEMENT PLAN 20 5.1 GENERAL 20 5.2 ASSET PROTECTION ZONE 20 5.2.1 SETBACK DISTANCES – NOOSA PLAN 2006 AND 2019 20 5.2.2 SETBACK DISTANCES – AUSTRALIAN STANDARD 3959-2018 CONSTRUCTION OF BUILDINGS IN BUSHFIRE PRONE AREAS 21 5.3 WATER SUPPLY 24 5.4 FIRE BREAKS 24 5.5 VEHICULAR ACCESS 24 5.6 FUTURE LANDSCAPING, REGROWTH AND FUEL LOAD REDUCTION 25 5.7 GENERAL PROPERTY MAINTENANCE 25 6 LEGISLATION AND OVERLAYS 27 6.1 NOOSA PLAN 2006 – BUSHFIRE HAZARD OVERLAY CODE 27 6.2 NOOSA PLAN 2019 – BUSHFIRE HAZARD OVERLAY CODE 32 7 CONCLUSION AND RECOMMENDATIONS 38 7.1 CONCLUSION 38 © 2020 ii
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Bushfire Hazard Management Plan v3 NCES REF: J000662 Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375, Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy 7.2 RECOMMENDATIONS 38 8 REFERENCES 40 APPENDIX 1 – SITE LAYOUT 41 © 2020 iii
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
1 INTRODUCTION
1.1 Background
North Coast Environmental Services was commissioned to prepare a Bushfire Hazard Management
Plan for Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375, Lot 2 on RP852009 and
Lot 8 on RP160703, located at 27 Wilgee Court, Cooroy (referenced hereafter as ‘the site’). The site
is the subject of a Reconfiguration of a Lot development application to be submitted to Noosa Council
and is mapped as being host to Bushfire Hazard Areas under both the Noosa Plan 2016 and Noosa
Plan 2019.
1.2 Development Proposal
The site is proposed to be subdivided into 16 rural residential lots as depicted on the Site Layout
plan (refer Appendix 1). The majority of the new allotments are 1.5ha. Access to the proposed lots
will be from Wilgee Court or from a new road to connect with Lake MacDonald Drive. Town water is
not proposed to be connected to the site.
1.3 Bushfire Hazard Area Mapping – Noosa Plan 2006
The Noosa Plan 2006 Bushfire Hazard Area mapping identifies that following Bushfire Hazard Areas
within the site (refer to Plate 1):
· Very High Potential Bushfire Intensity;
· Medium Potential Bushfire Intensity; and
· Potential Impact Buffer.
Plate 1 – Noosa Plan 2006 Bushfire Hazard Areas
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
1.4 Bushfire Hazard Overlay Mapping – Noosa Plan 2019
The Noosa Plan 2019 Bushfire Hazard Overlay mapping identifies the following Bushfire Hazard
Areas within the site (refer to Plate 2):
· High Potential Bushfire Intensity;
· Medium Potential Bushfire Intensity; and
· Potential Impact Buffer.
Plate 2 – Noosa Plan 2019 Bushfire Hazard Areas
1.5 State Planning Policy
The Queensland Government’s State Planning Policy (SPP) bushfire prone area mapping identifies
the following Bushfire Intensity Areas within the site (refer to Plate 3):
· Very High Potential Bushfire Intensity;
· Medium Potential Bushfire Intensity; and
· Potential Impact Buffer.
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
Plate 3 – State Planning Policy Bushfire Prone Area mapping
Under Chapter 2, Part 1, Section 8, Item 4(a) of the Planning Act 2016, where there is an
inconsistency between a State Planning Policy and local government planning instrument, the State
Planning Policy applies over the local planning instrument. Therefore, the SPP Bushfire Hazard
Areas mapping prevails with respect to the trigger for assessment under the Bushfire Hazard Overlay
Code of the Noosa Plan 2006 and 2019 and with respect to the hazard classes assigned to the site.
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
2 SITE DESCRIPTION
2.1 General
The site measures a combined area of 27.65ha and is located north-east of the township of Cooroy.
This site has formally been used for extractive industry and currently supports cleared areas,
vegetated areas and areas previously exposed to bulk earthworks. Lake MacDonald Drive is located
along the site’s eastern boundary and the site is surrounded by rural-residential land uses to the
north, south, east and west. Developed residential land is present to the south-west (refer to Plate
4).
Plate 4 – Site conditions and context (Source: Google Earth)
2.2 Topography
The site exhibits variable topography and ranges in elevation from 105m to 130m ASL. Several
ephemeral drainage lines traverse the site and a permanent watercourse flows east tom west
through the centre of the site. The previous land uses (extractive industries) and subsequent site
rehabilitation has resulted in the site having a highly modified/constructed topography with terraced
areas and constructed dams present within the site. Slopes within the site range from gentle to
moderate with varying aspects. A broad plain is present to the west of the site. Plate 5 depicts the
contour topography of the site whilst Plate 6 provides a 3D QLD Globe satellite image.
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
Plate 5 – Site Topography (Source: Noosa Interactive Mapping)
Plate 6 – Site Topography (Source: QLD Globe)
2.3 Vegetation
The following vegetation hazard classes (as per Leonard et al., (2014)) were identified during the
site inspection:
· Vegetation Hazard Class 02 – Open forests / woodlands – shrubby;
· Vegetation Hazard Class 08 – Acacia communities;
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
· Vegetation Hazard Class 12 – Mixture of rural classes – mainly grassland; and
· Vegetation Hazard Class 16 – Mixture of urban classes
The distribution of the vegetation hazard classes is presented in Figure 1 with descriptions provided
in the following sections.
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KEY THE SITE CD 100M BUFFER TO SITE GM VHC 02 - OPEN FOREST / WOODLANDS - SHRUBBY MB VHC 08 - ACACIA COMMUNITIES VHC 12 - MIXTURE OF RURAL CLASSES - MAINLY GRASSLAND MMP VHC 16 - MIXTURE OF URBAN CLASSES Box 9566 Pacific Paradise, QLD 4564 BUSHFIRE HAZARD ASSESSMENT AND MANAGEMENT PLAN : 07 5450 5984 STO | SCALE: SEE INSERT DRAWN: NW. FIGURE 1 27 WLGEE COURT, a COOROY DATE: 19.06.2019 SHEET NO: | OF 3 TITLE: VEGETATION UNITS
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
2.3.1 Vegetation Hazard Class 02 – Open forests / woodlands - shrubby
Vegetation Hazard Class 02 (VHC 02) occupies the northern and western peripheries of the site and
the central watercourse along with a small section of land in the south-west. This vegetation
community was observed to exhibit an average canopy height of approximately 20-30m with an
average projective foliage canopy cover of 50%. The canopy was dominated by a range of
myrtaceous species including Eucalyptus grandis (flooded gum), Eucalyptus microcorys (tallow
wood), Lophostemon confertus (brush box) and Corymbia intermedia (pink bloodwood). The
midstorey and understorey was characterised by juvenile canopy species and native shrubs and
vines. The dense to mid-dense ground cover was dominated by a range of native species including
ferns, grasses and herbs. Plate 7 depicts typical conditions within VHC 02, which is described by
Leonard et al. (2014) as having a potential fuel load of 30 t/ha.
Plate 7 – Characteristic vegetation within VHC 02
2.3.2 Vegetation Hazard Class 08 – Acacia communities
Vegetation Hazard Class 08 (VHC 08) dominates the southern slopes of the site and the mid slopes
of the hill in the north of the site. It comprises areas dominated by high density regrowth species
including Acacia species and Pinus ellioti (slash pine). VHC 08 is described by Leonard et al. (2014)
as having a potential fuel load of 10 t/ha. Plate 8 depicts typical conditions within VHC 08.
Plate 8 – Characteristic vegetation within VHC 08
2.3.3 Vegetation Hazard Class 12 – Mixture of rural classes – mainly grassland
Vegetation Hazard Class 12 (VHC 12) dominates the land about the site to the north, east and west.
It comprises areas dominated by high density exotic grass species including Setaria sphacelata
(South African pigeon grass) with lower density native species including Acacia species and Pinus
ellioti (slash pine). VHC 12 is described by Leonard et al. (2014) as having a potential fuel load of 5
t/ha. Plate 9 depicts typical conditions within VHC 12.
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
Plate 9 – Characteristic vegetation within VHC 12 (foreground)
2.3.4 Vegetation Hazard Class 16 – Mixture of urban classes
Vegetation Hazard Class 16 (VHC 16) comprises all areas of regularly maintained lawns and
residential gardens typical of the residential land uses to the west to south of the site. VHC 16 is
described by Leonard et al. (2014) as having a potential fuel load of 3 t/ha. Plate 10 depicts typical
conditions within VHC 16.
Plate 10 – Characteristic vegetation within VHC 16
2.4 Vegetation external of the 100m assessment buffer
The majority of the vegetation surrounding the site has been previously subjected to high levels of
modification. This has resulted in the majority of the remaining vegetation in the landscape being
highly fragmented, discontinuous and comprised of narrow linear tracts of vegetation.
A large unit of vegetation mapped as an 80/20 split of regional ecosystem 12.3.2 flooded gum tall
open forest and 12.3.1 lowland notophyll vine forest is present to the north-west of the site. RE 12.3.2
is representative of Vegetation Hazard Class 02 which is described by Leonard et al. (2014) as
having a potential fuel load of 30 t/ha. RE 12.3.1 is representative of Vegetation Hazard Class 16
Rainforest which is described by Leonard et al. (2014) as having a potential fuel load of only 1 t/ha
and exhibits Low potential bushfire intensity irrespective of slope influence.
Plate 11 depicts the extent of vegetation in the landscape surrounding the site.
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
Plate 11 – Vegetation external of the 100m assessment buffer (Image Source: Queensland Globe)
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
3 BUSHFIRE HAZARD ASSESSMENT
3.1 Hazard Assessment Methodology
A site-specific hazard assessment has been undertaken using a combination of methodologies from
the following sources:
· A new methodology for State-wide mapping of bushfire prone areas in Queensland (Leonard
et al., 2014) for:
o Attribution of Vegetation Hazard Classes;
o Calculation of Potential Bushfire Intensity; and
o Patch and corridor filtering.
· State Planning Policy Guideline – Mitigating the Adverse Impacts of Flood, Bushfire and
Landslide (June, 2003) which was used as a guide for undertaking natural hazard
assessment on a site-specific scale; and
· The Noosa Plan’s 2006 Bushfire Hazard Overlay Code.
The following sections detail the methodology used to determine the bushfire hazard risk acting on
the site.
3.2 Local Bushfire Hazard Mapping
A Local Hazard Area Map was prepared in two stages by adopting the following methodology:
· Categorizing the vegetation within the site in accordance with the vegetation hazard classes
derived from Leonard et al. (2014);
· Subdividing the identified vegetation hazard classes into bushfire hazard sub-units based on
slope categories and vegetation hazard classes. All upslope and across slope vegetation
units relative to building positions, are allocated an underlying slope of 0 degrees as per
methodology prescribed within the State Planning Policy Guideline – Mitigating the Adverse
Impacts of Flood, Bushfire and Landslide (2003). Narrow vegetated gullies aligned parallel
to the direction of attack upon buildings have also been applied a 0-degree slope category
given the equalizing impact of both positive and negative creek bank slopes;
· Using the patch and corridor filtering process identified in Leonard et al. (2014 and 2017) to
amend the bushfire hazard sub-units1. Patch filtered sub units are denoted by dashed sub
unit boundaries on Figure 3; and
· Application of 100m Potential intensity buffers to the amended sub-units to derive an overall
Local Hazard Area Map.
The sub-unit level Local Hazard Area Map is presented in Figure 2 and the overall Local Hazard
Area Map is presented in Figure 3. The subsequent Local Hazard Area Map identifies the following
Potential Bushfire Intensity areas within the assessment area:
· Medium Potential Bushfire Intensity area; and
· Potential Impact Buffer.
The Local Hazard Area Map presented in Figure 3 supersedes the SPP broadscale mapping
attributed to the site and has been used to guide the formulation of appropriate site-based bushfire
management measures herein.
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 100m 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., 2014).
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State Planning Policy — Natural Hazards, Risk and Resilience — Localised Bushfire Hazard Area Map Assessment Methodology Undertaken in accordance with methodology detailed in the State Planning Policy — State Interest Technical Manual Natural Hazards, Risk and Resilience (April, 2016). * From: Leonard, J., Newnham, G., Opie, K., and Blanchi, R. (2014) A new methodology for state-wide mapping of bushfire prone areas in Queensland. CSIRO, Australia. Sub Unit 1 , Fire Maximum Potential 7 Vegetation ed Weather Landscape Fireline oe Hazard Class (tiha) Severity Slope Intensity Intensity* (FFDI) (degrees) | (kw/m) * VHC 02. Open forests / woodlands - shrubby 30 50 0 29,893 Sub Unit 2 + Fire Maximum Potential Vegetation ee Weather Landscape Fireline a Hazard Class (tha) Severity Slope Intensity Intensity* (FFDI) (degrees) (kw/m) * VHC 08. Acacia communities 10 50 10 6,181 ee Sub Unit 3 - Fire Maximum Potential Vegetation ee Sorplased Weather Landscape Fireline oe Hazard Class (tiha) Severity Slope Intensity Intensity* (FFDI) (degrees) (kw/m) * VHC 12. Mixture ) 50 0-10 n/a of rural classes — mainly grassland Sub Unit 4 ; Fire Maximum Potential Vegetation earobeeet Weather Landscape Fireline Bgesi Hazard Class (ha) Severity Slope Intensity Intensity* 7 (FFDI) (degrees) (kw/m) * if ’ 5 fi " + five VHC 16. Mixture SUB UNIT 6 y 4 of urban classes 3 50 0 nia ow Yee eS). % J “Sane ‘ a * ' J Sub Unit 5 / ‘ . Fire Maximum Potential Vegetation ee Weather Landscape Fireline den Hazard Class (tha) Severity Slope Intensity Intensity* (FFDI) (degrees) (kw/m) * VHC 02. Open forests / seraree ee 30 50 10 39,395 shrubby Sub Unit 6 : Fire Maximum Potential Vegetation foe, Weather Landscape Fireline Belin Hazard Class (tha) Severity Slope Intensity Intensity* (FFDI) (degrees) (kw/m) * VHC 08. Acacia law communities 10 50 0 3,100 North Coast 20 80x 9586 Pace Paadse.c.0.4see | BUSHFIRE HAZARD ASSESSMENT AND MANAGEMENT PLAN [100M BUFFER TO SITE Il HIGH POTENTIAL BUSHFIRE INTENSITY FIGURED DIMENSIONS TO. | SCALE: SEE INSERT DRAWN: NW. | FIGURE? ee ental | ie eet aos 27 WILGEE COURT, Ill GRASSFIRE PRONE AREA BE READ IN RERERENGE ¥ Envronmenal Management Consultant COOROY MEDIUM POTENTIAL BUSHFIRE INTENSITY : PATER SHER END 2 RE | PURRERUNS
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ABN: 60625 108 625 27 WILGEE COURT, MEDIUM POTENTIAL BUSHFIRE INTENSITY AREA MERGED VIA PATCH FILTERING j SAP SREAU SEAR Gea | GREED EGS ; COOROY POTENTIAL IMPACT BUFFER E HOCAL HAZARD AREAS
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
3.3 Quantitative Modelling
Quantitative modelling of the potential bushfire conditions that may be experienced within the site
has been undertaken using the FLAMESOL Bushfire Attack Level Calculator. The FLAMESOL
calculator is a FPAA endorsed computer software modelling program that utilizes industry
standard bushfire equations and 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)
Fuel load inputs have been drawn from Leonard et al. (2014) based on the calculated potential
fuel loads for the dominant hazardous vegetation unit acting on the site (VHC 02 – Open forest /
woodlands – shrubby). Two sets of slope inputs have been assessed based on the dominant
upslope conditions underlying the vegetation in the south and east of the site (refer to Plate 12)
as well as the dominant downslope conditions in the north and north-west (refer to Plate 13).
Plate 12 – FLAMESOL Modelling results for VHC 02 on upslope and across slope conditions
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
The modelled output results illustrate that the VHC 02 vegetation with underlying upslope and
across slope topography relative to buildings has the potential to produce:
· 13.35m flame lengths
· A rate of spread of 1.5km/h
· A 23,250 kW/m fire intensity (which Byram (1959) described as the energy released per
unit time, per unit length of fire front, irrespective of depth).
Plate 13 – FLAMESOL Modelling results for VHC 02 on downslope conditions
The modelled output illustrates that the VHC 02 vegetation positioned on 10º downslope
conditions relative to buildings could be expected to produce:
· 23.03m flame lengths;
· A rate of spread of 2.99km/h; and
· A 46,353 kW/m fire intensity (which Byram (1959) described as the energy released per
unit time, per unit length of fire front, irrespective of depth).
Hence the VHC 02 hazardous vegetation on the modelled downslope topography represents
potential to exhibit approximately double the rate of spread and fire intensity output compared to
the VHC 02 hazardous vegetation positioned on level to upslope topography under the same
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Bushfire Hazard Management Plan v3 NCES REF: J000662 Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375, Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy weather conditions. Flame lengths increased by approximately 10m or 56% between the flat ground and downslope conditions. © 2020 16
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
4 BUSHFIRE RISK ASSESSMENT
4.1 General
The following sections provide an overall bushfire risk assessment for the proposed post
development conditions, which has been prepared generally in accordance with State Planning
Policy – State Interest Guideline – Natural Hazards, Risk and Resilience (DILGP, 2016) and
AS/NZS ISO 31000:2009 – Risk Management Methodology.
The bushfire risk assessment details the likelihood that the proposed development will be
exposed to bushfire smoke, ember, radiant heat and/or flame attack considering the proximity to
bushfire prone vegetation and likely bushfire behaviour. The risk assessment has assumed that
all proposed risk mitigation measures detailed in Section 5 of this report are implemented and
maintained.
According to AS/NZS ISO 31000:2009, 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 society will
not accept this risk and measures are to be put in place to reduce risks to at least
a tolerable level.
4.2 Risk from Hazardous Vegetation Within the Site
All lots are proposed to be comprehensively cleared excluding the land area in each lot proposed
to be registered under conservation covenant. Therefore the hazardous vegetation proposed to
be retained within the site comprises a small patch of VHC 02 Open forests / woodlands – shrubby
in the far south of Lot 6, a riparian corridor of VHC 02 on the centrally located watercourse and a
linear tract of VHC 02 and VHC 08 – Acacia communities along the north-west and northern
boundaries of the development site.
The northern tract of VHC 02 is positioned on a maximal land slope of 10º downslope of the
adjacent building envelopes hence the underlying slopes can be expected to exacerbate the
potential severity and intensity of a bushfire, via flame tipping and preheating/drying of fuel loads,
as it travels over inclining slopes towards the sensitive receivers.
VHC 02 vegetation straddles either bank of the central watercourse and therefore the underlying
slopes offer both positive and negative slope conditions. The limited vegetated slope length
within the creek environs infers that the slope characteristics are unlikely to significantly influence
fire behaviour and it is expected the flammability of the in-situ floristics would generate more
influence on fire behaviour.
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Bushfire Hazard Management Plan v3 NCES REF: J000662 Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375, Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy The available fire pathway length through the retained vegetation to the building envelopes is generally relatively short (i.e. less than 100m) and therefore a bushfire in the adjacent vegetation exhibits reduced potential of achieving maximum severity and intensity. The limited width also infers that a fire run along the axis of the vegetation would also achieve reduced potential fireline intensity. Overall the limited scale and widths of the retained vegetation within the site is expected to significantly curtail the risk associated with the vegetation. Sufficient separation is provided within all lots between building envelopes and adjacent covenant areas to infer that the risk of direct forest flame contact would be low. All of the retained vegetated areas represents risk of ember attack on the site by virtue of their inherent flammability. The risk of spot fires developing within and about the building envelopes would be considered low assuming low threat conditions are maintained post development of the site. The retained cleared areas within the site external of the nominated building envelopes are anticipated to comprise grassland which may be prone to low intensity but potentially fast-moving grass fires depending on weather conditions, grass curing and grass height. Overall there is considered to be a tolerable level of bushfire risk associated with the vegetation to be retained in the site post development. The risk is therefore deemed high enough to require new treatments or actions to reduce risk. 4.3 Risk from Hazardous Vegetation External of the Site There is limited hazardous vegetation surrounding the site inclusive of a lack of direct bushland connectivity with the site. The site is generally surrounded by low threat VHC 12 Mixture of rural classes – mainly grassland and VHC 16 Mixture of urban classes vegetation units which have low and discontinuous fuel loads and therefore exhibit very low bushfire risk. The VHC 12 vegetation to the east of the site, beyond Lake MacDonald Drive, where left unmanaged, exhibits potential of facilitating a grassfire toward the site, particularly under easterly winds. The fragmentation provided by Lake MacDonald Drive would however be expected to prevent most grassfires from breaching this roadway and entering the site. A large unit of vegetation; approximately 34 hectares, mapped as comprising an 80/20 split of regional ecosystem 12.3.2 flooded gum tall open forest and 12.3.1 lowland notophyll vine forest is present to the north-west of the site (refer Plate 14). The RE 12.3.2 dominated polygon is positioned in a high risk burn pathway toward the site where typically fire weather winds from the north to west would be expected to drive a fire in the vegetation towards the site. This vegetation unit exhibits an irregular footprint which is expected to suppress the potential for a fire therein to achieve maximum full intensity. VHC 16 Mixture of urban classes separates the hazard from the site hence a forest fire would be expected to extinguish upon interception of the VHC 16 conditions. The risk of direct flame contact with the site is therefore low. A narrow, single tree wide tract of VHC 02 vegetation extends for approximately 125m from the forest to the north-west to the western site boundary however would only be expected to support a low intensity fire, if not self-extinguish, by the time a fire head impacted the site. The position and flammability of the north-west vegetation unit infers it exhibits significant risk of imposing ember attack on the site including advancing spotting which may ignite vegetation within the site. Overall there is considered to be a tolerable level of bushfire risk associated with the vegetation to the north-west of the site post development. The risk is therefore deemed high enough to require new treatments or actions to reduce risk. © 2020 18
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Regional fire Point source
winds – N-W ignition
SITE
Plate 14 – Bushfire risk to the north-west of the site.
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5 BUSHFIRE MANAGEMENT PLAN
5.1 General
The following sections describe bushfire risk reduction measures to be incorporated into the
proposed development to reduce the risk of bushfire impact to people and property. This
assessment has been based on the anticipated post-development conditions within the site
based on the Plan of Development. 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 impact. The measures are intended to reduce
the potential severity of bushfire impact to the development and not prevent bushfire impact.
The scope of referenced management measures have been derived from:
· Appendices 5B & 8 of State Planning Policy 1/03 ‘Mitigating the Adverse Impacts of Flood,
Bushfire and Landslide, 2003;
· Noosa Plan 2006;
· Bushfire Hazard Planning in Queensland (1993). Queensland Fire & Rescue Authority,
Brisbane; and
· Australian Standard 3959-2018 Construction of Buildings in Bushfire Prone Areas
(AS3959 (2018)) Construction of Buildings in Bushfire Prone Areas.
5.2 Asset Protection Zone
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. The site has been
confirmed to be located within a Designated Bushfire Prone Area hence provision of adequate
building separation to the adjoining hazardous vegetation is prudent to minimise bushfire risk to
people and property on the site. For illustrative purposes Plate 14 depicts the concept of asset
protection zones adjacent to dwellings in bushfire prone areas.
Plate 14 – Asset Protection Zones (NSW PBP 2018)
5.2.1 Setback Distances – Noosa Plan 2006 and 2019
The Noosa Plan 2006 stipulates provision of bushfire setbacks for new dwellings on lots greater
than 2,500m2 that achieves building separation from hazardous vegetation for a distance the
minimum of 1.5 times the predominant mature canopy height or 10m, whichever is the greater.
The Noosa Plan 2019 Natural Hazards Overlay Code stipulates provision of bushfire setbacks
for new dwellings on lots greater than 2,500m2 that enable a Bushfire Attack Level 29 construction
standard to be achieved under AS3959.
The layout and proposed level of clearing has been designed to satisfy the Noosa Plan 2019 BAL
29 setback requirements. The provision of the minimum setback distance to achieve a BAL
29 construction standard under AS3959-2018 using FDI 50 is therefore set as the
recommended Asset Protection Zone setback distance to be achieved between all future
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habitable buildings and any adjacent hazardous vegetation.
Note the location of building works within a Bushfire Prone Area on Council’s Bushfire Hazard
Overlay Map triggers building design assessment under AS3959 (2018) (not the SPP mapping).
The current Noosa Plan 2006 Bushfire Hazard Areas overlay map only maps limited land within
the site within a Bushfire Prone Area. In contrast the New Noosa Plan 2019 captures the entire
site within a Bushfire Prone Area. Whilst some buildings may not be triggered for assessment
against AS3959-2018 post development of the site, the applicable setbacks to retained
hazardous vegetation to achieve a BAL 29 outcome have been set as a recommendation herein
and must be incorporated into the plan of development to satisfy the findings of this assessment
and the both the Noosa Plan 2006 and Noosa Plan 2019. Note the adoption of BAL 29 setbacks
has been used as an alternative solution to satisfy the Noosa Plan 2006 1.5 times tree height
setback requirement.
A provisional BAL assessment has been undertaken in Section 5.2.2 for all lots to determine the
minimum respective setback distances required on each lot to achieve a BAL 29 outcome.
5.2.2 Setback Distances – Australian Standard 3959-2018 Construction of
Buildings in Bushfire Prone Areas
The location of the site within a Bushfire Prone Area on Council’s Bushfire Hazard Overlay Map
triggers building design assessment under AS3959 (2018), which provides minimum construction
requirements for new dwellings 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. New buildings 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 Standard. The BAL system is based on the potential exposure of the site (the dwelling) to
heat flux exposure thresholds, expressed as kW/m2. Table 3.1 of AS3959 (2018) describes the
various BAL’s, their associated heat flux exposure thresholds and levels of exposure.
Table 2.6 from AS3959-2018 details the required setbacks to vegetation to achieve the various
BAL’s. The BAL assessment row for all lots exposed to vegetation on level to across slope
topography has been highlighted with a red rectangle. A blue rectangle denotes the applicable
BAL setback ranges for lots exposed to vegetation on downslope topography.
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(Source – AS3959-2018)
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Table 2.6 identifies that:
· A minimum separation of 16m is required to achieve a BAL 29 outcome for all lots fronting
VHC 02 vegetation on underlying upslope to across slope topography; and
· A minimum separation of 24m is required to achieve a BAL 29 outcome for all lots
fronting VHC 02 vegetation on underlying downslope 5-10º topography.
Table 2 identifies the Asset Protection Zone for each new allotment (where applicable),
determining the distance required to achieve the BAL 29 outcome.
Table 2 - Outlining the asset protection zones for each lot
Lot Number Asset Protection Zone
Vegetation Slope Direction to Distance required
(across or Hazardous Vegetation to achieve BAL 29
downslope) (from building (m)
envelope)
1 Downslope North and east 24
2 N/A N/A N/A
3 Downslope South 24
4 Across slope North 16
5 N/A N/A N/A
6 Across slope South-west 16
7 N/A N/A N/A
8 Across slope North 16
9 Downslope South/south-west 24
10 N/A N/A N/A
11 Downslope South and West 24
12 Downslope West 24
13 Downslope North 24
14 Downslope North 24
15 Downslope North 24
16 Downslope South 24
An assessment of the ability to achieve a BAL 29 outcome for each lot’s nominated building
envelope has been undertaken based on:
· The proposed clearing of all vegetation within each lot not encumbered by proposed
conservation covenants;
· Assuming all revegetation works within the covenant areas will attain the fuel load
equivalent of 30t/ha for the dominant VHC 02 vegetation; and
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· Applying 0º topography to the central watercourse based on averaging the upslope and
downslope topography on either bank.
Based on the above assumptions, all proposed allotment building envelopes currently achieve
the target BAL 29 construction standard under AS3959-2018. It is noted that Lot 6 will be flanked
by approximately 600m² of vegetation which will be separated by more than 100m from other
assessable vegetation hence considered low threat vegetation as per 2.2.3.2 of AS3959-2019).
It is important to note that the capacity to achieve a BAL 29 outcome or less has been based on
the availability of the necessary cleared setbacks to hazardous vegetation measured from the
perimeter of the proposed buildings envelopes, as the plan of development clearly states that
buildings can be sited anywhere within the envelopes.
The final applicable BAL rating for the future habitable dwelling on each lot will require
confirmation upon finalisation of the dwelling position within the proposed building envelope and
its distance to the approved covenant boundary and vegetation therein.
The setback recommendations may require alteration should site conditions and/or the AS3959
(2018) BAL calculation methodology change in the future. The respective landowners 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).
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 not available to the site. To comply with the Bushfire
Hazards Overlay Code prescribed under both the Noosa Plan 2006 and 2019, all proposed
allotments will be required to provide:
· 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
· 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).
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.
Given the limited scale of hazardous vegetation identified adjacent to building envelopes within
and adjacent to the site, combined with the irregular topography including gullies and steep slopes
between the building envelopes and retained vegetation, the provision of fire breaks between the
hazardous vegetation and the building envelopes is considered impracticable and unwarranted
on the proviso the minimum Asset Protection Zones recommended herein are implemented.
5.5 Vehicular Access
New developments in bushfire prone areas should be serviced by safe access/exit points for both
residents and emergency services personnel. A cul-de-sac is proposed as part of the
development to avoid impacts to Ecologically Important Areas (i.e. creek crossing in centre of the
site). The cul-de-sac is supported in this instance as the road will be flanked by low threat cleared
conditions associated with the front yards of the proposed lots. Additionally, the cul-de-sac will
have direct connectivity to Lake MacDonald Drive which provides for easy and safe evacuation
of residents and access by emergency services.
The proposed new road complies with a grade of less than 12.5% hence safe access and egress
is anticipated to be available at all times to the northern portion of the development for emergency
vehicles and personnel. The proposed grade of driveways serving the southern portion of the site
was not available at the time of assessment but should be confirmed before an approval is issued
or set as a condition of approval.
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5.6 Future Landscaping, Regrowth and Fuel Load Reduction
To reduce the potential for bushfire impact to buildings, structures and occupants as a result of
future landscaping, regrowth and fuel load accumulation within the site, the following is
recommended:
· APZ’s are maintained as a low threat zone dominated by manicured grass to a nominal
100mm height which is regularly mowed to reduce fuel loads and the risk of a grassfire
encroaching toward the dwelling.
· Any landscaping within the APZ satisfies the low threat vegetation criteria prescribed in
section 2.2.3.2 of AS3959-2018 or later iterations thereof, where applicable, and be
planted as discrete isolated clumps of low flammability vegetation aligned parallel the
building to aid in interception of ember and smoke attack and not perpendicular and in a
manner which could transmit fire toward the dwelling;
· No woody mulch is used within 2m of buildings;
· No non-rainforest trees be planted within 10m of dwellings and no non-rainforest tree
limbs extend to within 6m of the roof line of dwellings;
· 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;
· Surface fuels and woody regrowth be controlled in the APZ to maintain a low fuel load
environment. Roof tops, roof gutters and other areas of the dwellings and including
ancillary infrastructure such as garden sheds be regularly inspected, and debris removed
to reduce the risk of spot fires developing in the properties during a bushfire event.
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 Rescue 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).
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· Trim low-lying branches two metres from the ground surrounding your home.
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Bushfire Hazard Management Plan v3 NCES REF: J000662 Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375, Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy 6 LEGISLATION AND OVERLAYS 6.1 Noosa Plan 2006 – Bushfire Hazard Overlay Code The proposed development is considered assessable development and therefore is assessable against Table 13.9 Bushfire Hazard Areas of Council’s Natural Hazards Overlay Code which has been reproduced as Table 3. © 2020 27
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Table 3 – Table 13.9 Bushfire Hazard Areas – Natural Hazards Overlay Code Noosa Plan 2006
SPECIFIC OUTCOMES PROBABLE SOLUTIONS PROPOSED SOLUTION
13.39 Reconfiguration of a Lot
General
O10 The safety of people and property are S10.1 The proposed lots are not located on PS10 – This Bushfire Hazard Assessment and
maintained by: land that is subject to Medium or High Bushfire Management Plan has been prepared to
Hazard on overlay maps OM1.4-OM9.4; maintain the safety of people and property
a) Locating house site areas and other
from the adverse impacts of bushfire. The
sensitive uses on that part of the land least OR
majority of building envelopes are sited on
affected by the bushfire hazard; and
land not encumbered by Medium or High
S10.2 The proposed lots are sited on land
b) fire mitigation methods are used that are Bushfire Hazard areas on overlay maps
determined as low bushfire risk by a site-
adequate for the Potential Bushfire Hazard OM1.4-OM9.4;
specific bushfire hazard assessment.
rating of the individual site, having regard to –
AND
i. vegetation type;
ii. slope; S10.3 Additional lots are not created where Post development the new road and individual
their only vehicular access route is through a allotment access routes are proposed to be
iii. aspect;
Medium or High Bushfire Hazard area shown flanked by cleared residential allotments
iv. on-site and off-site fire hazard implications on overlay maps OM1.4-OM9.4 hence the access routes will exhibit limited
of the development; risk of being constrained during a bushfire.
v. bushfire history;
vi. conservation values of the site; and
vii. ongoing maintenance.
Firebreaks and fire access tracks
O11 Firebreaks or fire access tracks S11.1 Firebreaks are provided by— PS11.1 Given the limited scale of hazardous
provide— vegetation identified adjacent to building
a) a cleared road reserve not less than 20m
envelopes within and adjacent to the site,
a) adequate access for fire fighting and other wide located around the perimeter of the
combined with the irregular topography
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SPECIFIC OUTCOMES PROBABLE SOLUTIONS PROPOSED SOLUTION
emergency vehicles; and subdivision, between the created lots and including gullies and steep slopes between
surrounding vegetated lands; the building envelopes and retained
b) adequate width to minimise the risk of fire
vegetation, the provision of fire breaks
crossover. OR b) fire access tracks (may be in the form
between the hazardous vegetation and the
of an access easement) between the created
building envelopes is considered both
lots and surrounding vegetated lands that—
impracticable and unwarranted on the proviso
i. are a minimum cleared width of 6m; the minimum Asset Protection Zones
ii. have a formed pavement; recommended herein are implemented.
iii. have access at each end and in other
locations where necessary;
iv. have passing areas and turning areas;
v. have clearly identified access points for
emergency vehicles; and
vi. are located on public land or within access
easements that are granted in favour of the
Sunshine Coast Regional Council and the
Queensland Fire and Rescue Service.
Road network
O12 Roads provide for the safe and effective S12.1 Cul-de-sacs or no-through roads are PS12.1 (a and b) A cul-de-sac is proposed as
evacuation of users of premises and access not used in the street network unless— part of the development to avoid impacts to
by Emergency services. Ecologically Important Areas (i.e. creek
a) a perimeter road reserve with a minimum
crossing in centre of the site). The cul-de-sac
reserve width of 20m and a formed width of
is supported in this instance as the road will
not less than 6m is provided; or
be flanked by low threat cleared conditions
b) cul-de-sacs or no-through roads are associated with the front yards of the
provided with fire trails or access easements, proposed lots. Additionally, the cul-de-sac will
capable of being navigated by conventional have direct connectivity to Lake MacDonald
vehicles, that link to through roads (see Drive which provides for easy and safe
Figures 13.3 and 13.4); evacuation of residents and access by
emergency services
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SPECIFIC OUTCOMES PROBABLE SOLUTIONS PROPOSED SOLUTION
AND The proposed new road complies with a grade
of less than 12.5%.
S12.2 Roads have a maximum grade of 1 in 8
(12:5%).
Lot design
O13 Lot design and building siting minimises S13.1 Each residential lot—
bushfire hazard to people and property having
a) includes a house site area, identified on the (a) Building envelopes have been nominated
regard to slope, aspect, existing vegetation
plan of subdivision; for all proposed allotments.
and adequate separation from hazardous
vegetation b) is of sufficient size and dimensions to (b) All allotments are of sufficient size and
accommodate a dwelling and ancillary shape to allow for efficient emergency access
buildings and use areas; to buildings for fire fighting appliances. Three
battle-axe allotments are proposed; Lots 3, 8
c) for lots more than 2,500m —
& 9, which are anticipated to still provide
i. conform with the principles for house site efficient emergency access to buildings as the
numbers 1, 2 or 3 shown in Figure 13.5; and access routes are/will be flanked by low threat
ii. are separated from hazardous vegetation vegetation including Lake MacDonald Drive
for a distance the minimum of 1.5 times the and cleared rural-residential lots.
predominant mature canopy height or 10m, (c) i. Insufficient vegetated slope length will be
whichever is the greater; and present adjacent to the building envelopes
d) for lots less than 2,500m2, maximise post development to warrant compliance with
separation of buildings from hazardous S13.1 (c)i.
vegetation. ii. All proposed allotments are proposed to be
provided with setbacks that enable AS3959
Bushfire Attack Level 29 construction
requirements or lower.
(d) Not applicable.
S13.2 Residential lots are designed so that The majority of house sites are provided with
their size and shape allow for efficient short length driveway access to the proposed
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SPECIFIC OUTCOMES PROBABLE SOLUTIONS PROPOSED SOLUTION
emergency access to buildings for fire fighting new internal road. Any extended driveway
appliances (e.g. by avoiding long narrow lots lengths are to be flanked by cleared areas
with long access driveways). which represent low risk of constraining
access and egress in a bushfire event.
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Bushfire Hazard Management Plan v3 NCES REF: J000662 Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375, Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy 6.2 Noosa Plan 2019 – Bushfire Hazard Overlay Code The proposed development is considered assessable development and therefore will become assessable, depending on the application lodgement date, against Table 8.2.3.2 Bushfire Overlay Code of the New Noosa Plan 2019 which has been reproduced as Table 3. © 2020 32
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Table 3 – Table 8.2.3.2 Criteria for Assessable Development - Noosa Plan 2019 Bushfire Hazard Overlay Code
PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
Safety of people and property
PO1 AO1.1 This Bushfire Hazard Management Plan has been
prepared to maintain the safety of people and
Development maintains the safety of people and Development which will materially increase the
property from the adverse impacts of bushfire. The
property from the adverse impacts of bushfire. number of people living or congregating on
clearing associated with the development will
premises, including reconfiguring a lot, is not
significantly reduce the threat of bushfire
located within a medium or high bushfire hazard
transmission throughout the site.
area.
AO1.2 All proposed allotments are to be provided with
setbacks that enable AS3959 Bushfire Attack
Development maximises setbacks from
Level 29 construction requirements or lower.
hazardous vegetation to achieve an acceptable
risk.
Impacts on Ecologically Important Areas
PO2 No acceptable outcome provided Clearing of an on Ecologically Important Area is
required on Lot 6 to support a building envelope
Bushfire mitigation measures do not adversely
and an APZ that enables a BAL 29 building
impact on:
construction standard. This impact is proposed to
· biodiversity values, connectivity and be offset by extensive rehabilitation and
ecosystem functioning; and revegetation works within the proposed covenant
· the long term physical integrity of areas on the site (refer Ecology Report 2019 by
waterways, wetland and areas of native NCES).
vegetation.
Water Supply for Fire Fighting Purposes
PO3 AO3.1
Premises are connected to the reticulated water
supply.
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PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
Development provides an adequate water supply OR
for fire fighting purpose which is reliable, safely
located and freely accessible. AO3.2
Reticulated water will not be available to the
Where there is no available reticulated water
premises. In this regard, each premise is
supply, the premises has:
required to be provided with:
· an accessible dam, swimming pool or water · An accessible dam, swimming pool or water
tank available for fire fighting purposes with tank available for fire fighting purposes with
an onsite water volume of not less than an onsite water volume of not less than
5,000 litres; and 5,000 litres; and
· a water supply outlet pipe 50 millimetres in · A water supply outlet pipe 50 millimetres in
diameter fitted with a standard fire brigade diameter fitted with a standard fire brigade
fitting connected to the water supply (other fitting connected to the water supply (other
than where the water supply is in a than where the water supply is in a
swimming pool or dam). swimming pool or dam).
Essential Community Infrastructure
PO4 AO4.1 N/A – the development is not ‘essential community
infrastructure’.
Essential community infrastructure is able to Development involving essential community
function effectively during and immediately after infrastructure is not located within a medium or
bushfire events. 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.
Hazardous Materials
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PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
PO5 AO5 N/A – Hazardous materials will not be
manufactures or stored in bulk.
Public safety and the environment are not Hazardous materials are not manufactured or
adversely affected by the impacts of bushfire on stored in bulk in a bushfire hazard area.
hazardous materials manufacturing or storing in
bulk.
Access and Evacuation Routes
PO6 AO6.1
Roads provide for easy and safe evacuation of The road layout provides for through-roads and
residents of premises and access by emergency avoids cul-de-sacs and dead-end roads.
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 A cul-de-sac is proposed as part of the
development to avoid impacts to Ecologically
Cul-de-sacs or no-through roads are provided
Important Areas (i.e. creek crossing in centre of the
with fire trails or access easements, which are
site). The cul-de-sac is supported in this instance
capable of being navigated by conventional
as the road will be flanked by low threat cleared
vehicles and which link to through roads.
conditions associated with the front yards of the
proposed lots.
Additionally, the cul-de-sac will have direct
connectivity to Lake MacDonald Drive which
provides for easy and safe evacuation of residents
and access by emergency services
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
AO6.4 Safe access and egress will be available to all
building envelopes via the post development
Safe access and egress is available at all times to
conditions (i.e. topography and cleared areas).
all of the development for emergency vehicles
and personnel.
Lot design
PO7 AO7 (a) Building envelopes have been nominated for all
proposed allotments.
Lot design and building siting minimises bushfire Each residential lot:
hazard risk to people and property. (b) The majority of the allotments are of sufficient
a) includes a building envelope, identified on a
size and shape to allow for efficient emergency
plan of subdivision;
access to buildings for fire fighting appliances.
b) is of sufficient size and shape to allow for
Three battle-axe allotments are proposed; Lots 3,
efficient emergency access to buildings for
8 & 9, which are anticipated to still provide efficient
fire fighting appliances (e.g. by avoiding
emergency access to buildings as the access
battle-axe/hatchet lots and long narrow lots
routes are/will be flanked by low threat vegetation
with long access driveways to buildings);
including Lake MacDonald Drive and cleared rural-
c) where more than 2,500m², achieves
residential lots.
setbacks from hazardous vegetation in line
with Bushfire Attack Level 29 requirements (c) All proposed allotments are greater than
as per AS3959; and 2,500m2 and are proposed to be provided with
d) is designed so that buildings and structures setbacks that enable AS3959 Bushfire Attack
are sited in locations of lowest hazard within Level 29 construction requirements or lower.
the lot and elements of the development
(d) All buildings will be surrounded by extensive
least susceptible to fire are closest to the
cleared areas equivalent to low threat vegetation
fire hazard.
conditions.
Firebreaks and fire access tracks
Given the limited scale of hazardous vegetation
PO8 AO8.1
identified adjacent to building envelopes within and
Firebreaks and fire access tracks provide: Where development involves the creation of a adjacent to the site, combined with the irregular
new road and lots, a firebreak is provided by topography including gullies and steep slopes
a) adequate access for fire fighting and other between the building envelopes and retained
providing a cleared road reserve not less than 20
emergency vehicles; and
metres wide and maximum gradient of 12.5% vegetation, the provision of fire breaks between the
hazardous vegetation and the building envelopes
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
PERFORMANCE OUTCOMES ACCEPTABLE OUTCOMES PROPOSED SOLUTION
b) adequate access for the evacuation of around the perimeter of the subdivision, between is considered unwarranted on the proviso the
residents and emergency personnel in an the created lots and surrounding vegetated lands. minimum Asset Protection Zones recommended
emergency situation. herein are implemented.
OR
AO8.2 Given the limited scale of hazardous vegetation
identified adjacent to building envelopes within and
Fire access tracks are provided between the
adjacent to the site, combined with the irregular
created lots and surrounding vegetated land that:
topography including gullies and steep slopes
a) have a cleared minimum width of 6 metres; between the building envelopes and retained
b) have a maximum gradient of 12.5%; vegetation, the provision of fire access tracks
c) provide unbroken access for fire fighting between the hazardous vegetation and the
vehicles; building envelopes is considered unwarranted on
d) provide passing bays and turning areas; the proviso the minimum Asset Protection Zones
e) are located within an access easement that recommended herein are implemented.
is granted in favour of Noosa Council and
the Queensland Fire and Rescue Service.
AO8.3 All bushfire management measures including
prescribed APZ’s are proposed within the site and
Bushfire management measures are carried out
not within any adjoining site.
on the subject property and not any adjoining
property.
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
7 CONCLUSION AND RECOMMENDATIONS
7.1 Conclusion
This Bushfire Hazard Management Plan has been prepared to assess the degree of bushfire
hazard risk acting on the following allotments present at 27 Wilgee Court, Cooroy:
· Lot 101 on SP142407;
· Lot 140 on MCH978;
· Lot 3 on RP137375;
· Lot 2 on RP852009; and
· Lot 8 on RP160703
The assessment has recommended numerous bushfire reduction measures, which if adopted,
will assist in the protection of people and property during a bushfire emergency. Overall, the
proposed Reconfiguration of a Lot development (as detailed in the Plan of Proposed
Reconfiguration) in combination with recommendations referenced herein, is deemed suitable
to provide a reasonable level of protection for people and property on the site.
The proposed plan of development has been found to be compliant with both the existing
Noosa Plan 2006 Natural Hazards Overlay Code Table 13.9 Bushfire Hazard Areas and the
New Noosa Plan 2019 Bushfire Hazard Overlay Code subject to enactment of the
recommendations set herein.
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 the development zone and not prevent
actual bushfire impact. Site occupants are strongly recommended to seek regular advice from
local fire authorities to ensure the subject recommendations remain appropriate in future
years.
The first call in the event of a bushfire should always be ‘000’.
7.2 Recommendations
The following recommendations are made to achieve a reasonable level of protection for
people and property on the site and to facilitate compliance with the Noosa Plan 2006 Natural
Hazards Overlay Code Table 13.9 Bushfire Hazard Areas and the New Noosa Plan 2019
Bushfire Hazard Overlay Code:
· The APZ’s nominated in this report are maintained for the life of the development as a
low threat vegetation zone consistent with the definition of same as defined in AS3959;
· If applicable, the future dwelling on each lot be provided with a water supply that
satisfies AO3.2 of the New Noosa Plan Bushfire Hazard Overlay Code which requires:
o 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
o 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).The proposed Lot 1 future dwelling provides for
an accessible dam, swimming pool or water tank accessible by the fire brigade
that contains at least 5,000 litres of water to be exclusively available for
firefighting purposes;
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Bushfire Hazard Management Plan v3 NCES REF: J000662
Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375,
Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy
· 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;
· Surface fuels and woody regrowth be controlled in all APZ’s to maintain a low fuel load
environment. Roof tops, roof gutters and other areas of the dwellings and including
ancillary infrastructure such as garden sheds be regularly inspected, and debris
removed to reduce the risk of spot fires developing in the properties during a bushfire
event;
· No mulched garden beds be present within 3m of buildings or part thereof located in
the confirmed bushfire hazard areas on Figure 3. Organic mulch can be substituted
for inorganic materials such as pebbles or rocks;
· All driveways, roads and access routes be cleared to a minimum of 6m width and 4m
vertical height and be constructed to NSC standard; and
· A suitably qualified and experienced AQF Level 5 arborist assess the hazard
associated with any trees that are to be retained within their fall distance (including
canopy limbs overhanging) of driveways, roads and access routes upon their
construction. Any identified hazardous trees/limbs are to be removed along with a
general dead wooding program undertaken prior to the use of the site commencing.
The arborist assessment should include a program of dead wooding along the routes,
where applicable, for the life of the development.
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Bushfire Hazard Management Plan v3 NCES REF: J000662 Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375, Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy 8 REFERENCES Bradstock, Gill & Williams. 2012. Flammable Australia: fire regimes, biodiversity and ecosystems in a changing world. CSIRO, Collingwood, Victoria. Byram, G. M. 1959. Combustion of forest fuels. Pages 61-89 In: Davis, K. P., editor. Forest fire: control and use. New York, NY: McGraw-Hill. Department of Emergency Services (2003). Appendix 3 & 8 State Planning Policy 1/03 Guideline: ‘Mitigating the Adverse Impacts of Flood, Bushfire and Landslide’. Brisbane. 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., Newnham, G., Opie, K., and Blanchi, R. (2014) A new methodology for state-wide mapping of bushfire prone areas in Queensland. CSIRO, Australia. Southeast Queensland Fire and Biodiversity Consortium – Operational Manual. Webster. 2002. The Complete Bushfire Safety Book. Random House (Aust) Pty Ltd. © 2020 40
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Bushfire Hazard Management Plan v3 NCES REF: J000662 Lot 101 on SP142407, Lot 140 on MCH978, Lot 3 on RP137375, Lot 2 on RP852009 and Lot 8 on RP160703 - 27 Wilgee Court, Cooroy APPENDIX 1 – SITE LAYOUT © 2020 41
Page 46
LOT 1
50m VEGETATION 1.50 Ha
BUFFER SETBACK LOT 15
(TYPICAL) LOT 14
1.50 Ha
50m
1.50 Ha
16m
LOT 13
1.50 Ha
P
TY
m
20
LOT 12
1.50 Ha
30m LOT 2
1.50 Ha
10m
LOT 10
1.50 Ha
LOT 11
1.50 Ha
LOT 16
4.42 Ha
LOT 9
1.50 Ha LOT 3
1.50 Ha
10m TYP
LOT 7
1.50 Ha NOTE: LOCATION OF BUILDING
PAD IS INDICATIVE ONLY. PAD
CAN BE SITUATED ANYWHERE
WITHIN THE BUILDING ENVELOPE.
LOT 8
2.12 Ha
% .
15 X
= MA
DE AY
RA W
G IVE
DR
LOT 4
1.50 Ha
LOT 6
1.50 Ha
PO HIG
W H
ER VO 10m
EA LT
SE AG LOT 5
M E 1.50 Ha
10m
EN
T
20m
Subdivision Plan 01.v1 -
June 2019 - 125 Lake
NORTH Macdonad Dr, Lake
Macdonald
0 50 100 200m