Natural Hazards
Bushfire, Landslide, Critical Infrastructure Movement Network,
Flooding, Coastal Hazard Overlay Provisions
Session outline
1.
Policy framework
2.
Flood and Coastal hazard Policy setting and comparison
3.
Flood policy
4.
Coastal hazard
5.
Bushfire overlay
6.
Landslide overlay
7.
Critical infrastructure movement network overlay
8.
Certification
9.
Summary
Policy Framework
 Superseded State Planning Policy (SPP) 1/03 Mitigating the
Adverse Impacts of Flood, Bushfire & Landslide
 Superseded SPP 3/11 Coastal Protection and Coastal
Protection SPRP
 Single State Planning Policy
 Statutory instrument

Expressing the Queensland Government’s interest in
minimising adverse impacts of these natural hazards on
people, property, economic activity, and the environment
when making decisions about development
Result
 Natural hazard management area overlay maps
 Brisbane City Plan 2014 overlay code, levels of assessment
 Strategic land use and Strategic framework review
 Other scheme and non-scheme actions
Flood and Coastal Hazard
 Brisbane's residents, businesses and properties are not
exposed to unacceptable flood risks and natural hazards
 Brisbane adopts a risk-management approach to dealing with
natural hazards, such as flooding
 Risk management balances the economic, social and
environmental costs and benefits to the city
 New development is located in the right place, designed and
sited to tolerate a wide range of flood events and natural
hazards
 Part of implementing Brisbane’s FloodSmart Futures Strategy
2012 - 2031
Flood and Coastal Hazard Policy Setting
• New flood risk management approach applied in Brisbane City Plan 2014
through Flood planning scheme policy
• Flood overlay code provisions ensure that future development contributes to
a safe and flood resilient city
• Code categorises flood susceptibility into six flood planning areas (FPAs 1 5 for river and creek flooding & overland flow) describing how future
development might be affected by flooding
• FPAs are mapped as an overlay and take account of flood depth, velocity
and frequency
• Code sets an assessment framework to ensure development is designed
and sited to be resilient to natural hazards and support disaster
management in a flood event
Flood and Coastal Hazard Policy Setting
 Code sets an assessment framework to ensure development is designed
and sited to be resilient to natural hazards and support disaster
management in a flood event
Examples of Flood Overlay Mapping
Flood Planning Policy Comparison
Flood Overlay Policy Comparison
Brisbane City Plan 2000
Brisbane City Plan 2014
Flood provisions found in range of codes and
subdivision and development guidelines
Specific provisions found in: Flood overlay code,
Flood Planning Scheme Policy, Stormwater code and
Coastal hazard overlay code
One flood extent only mapped (‘one-line’ approach to
flood planning)
Flood Planning Areas (FPA 1-5 + overland flow)
mapped
Applicant to determine development compatibility
with flooding. Risk management approach for
Brisbane river flooding only
Development use compatibility based on FPA or risk
management approach.
 Hazardous materials to be considered and
addressed as part of the DA
Dwelling houses and development to have minimum
floor/pavement levels
Siting of development to meet minimum
requirements and / or adopt risk management
approach
Houses to address minimum floor levels, flood
impact and structural strength
Jan 2011 adopted as Interim Response Flood Level houses up to 9.5 m height
Jan 2011 confirmed houses up to 9.5 m height
All development with similar access requirements
Special access requirements for vulnerable uses
Flood Overlay Policy Comparison
Brisbane City Plan 2000
Brisbane City Plan 2014
Utilities to meet minimum flood immunity
requirements (under Brisbane Flood
Response Amendments)
Utilities to meet minimum flood immunity
requirements retained and moved into Flood
code
Basements to have minimum flood level
immunity at entry and be made watertight
(tanked)
Basements to have minimum flood level
immunity at entry and be made watertight
(tanked). If utilities in basement then backup
pumps and power
Essential community infrastructure (hospitals
etc) to have minimum flood immunity
Essential community infrastructure (hospitals
etc) to have minimum flood immunity, access
and operational capability to an appropriate
flood event, incl backup power and
communications
No requirements to consider specific
characteristics of Brisbane river flooding
Development in Upper Brisbane River to
consider 0.2% AEP event
Coastal Hazard Overlay Code Policy
Comparison
Brisbane City Plan 2000
Brisbane City Plan 2014
Hazard Area not mapped – Determined from
superseded non statutory Flood Flag Maps
including 0.3 m allowance for climate
variability
Coastal Hazard Overlay Mapping for Storm Tide (High &
Medium Hazard) and Erosion prone areas - based on
state mapping to 2100 including 0.8 m for climate
variability
Houses minimum floor level of 2.5 m AHD
100 year Storm Tide Level + 0.5 m Freeboard
= 3.0 m AHD to 2050
Houses minimum floor level of 2.5 m AHD 100 year
Storm Tide Level + 0.5 m Freeboard = 3.0 m AHD to
2050
Other development minimum floor, lot and
new road levels based upon 2.5 m AHD 100
year ARI Storm Tide Level
Other development minimum floor, lot and new road
levels based on 3.1 m AHD 100 year ARI 2100 Storm
Tide Level or risk managed solution
Requirement for access and essential
community facilities immunity levels
Provisions to provide for suitable access to development,
managing hazardous materials, vulnerable uses and
essential community facilities similar to Flood overlay
code
No material impacts on others
Development does not concentrate, intensify or divert
floodwater, erosion impacts or cause nuisance ponding
onto other premises
Certification
 Registered Professional Engineer of Queensland (RPEQ) sign off may be required
for houses
 Certify structural soundness
 Certify no material increase of flood hazard on others
 Determine flood level for overland flow areas
 RPEQ sign off required for other development in certain circumstances including
 Certify structural soundness
 Certify no material increase of flood hazard
 Undertake flood study as necessary
 Undertake a flood risk assessment
 Undertake a coastal hazard risk assessment
Bushfire Overlay Policy Comparison
Brisbane City Plan 2000
• No bushfire mapping in
scheme
• Provisions applied to
residential properties in
EP, Rural areas irrespective of actual
hazard
• Additional provisions in
some neighbourhood
plans
Brisbane City Plan 2014
• Bushfire overlay, code and PSP
introduced
• Dwelling houses not triggered for
assessment against Bushfire overlay
code
• Overlay areas ‘designated bushfire prone
areas’ for assessment against AS3959
(certifier does this under NCDC)
• Overlay code applies for material change
of use other than houses, ROL
• New planning scheme policy containing
guidance on bushfire hazard assessment
and bushfire management plans
Bushfire Overlay Table of Assessment
• Overlay code not called up for dwelling
houses
• Overlay applies to other land uses and
ROL
• Self assessment outcomes where
complying with section A for new
premises or extensions less than 25 m2
• Essential community infrastructure,
vulnerable uses, difficult to evacuate
uses and assembly uses - code assessment
• Storage and handling of dangerous materials exceeding amounts
specified in the Industry code - code assessment
• ROL - code assessment
Assessment Criteria Overview
 Land within the Bushfire overlay is a 'designated bushfire prone area’ for application of AS 3959-2009
Construction of buildings in bushfire-prone areas
 Overlay mapping triggers site based assessment. No further assessment against code if assessment
determines low hazard is low (PO1/PO15 in code).
 Site specific bushfire assessment methodology and requirements, including who can do this assessment,
contained in Bushfire planning scheme policy.
 Bushfire management plans (BMP) guided by Bushfire PSP
 Code matters include:
 site specific bushfire hazard assessment
 siting of buildings
 access for evacuation and emergency services
 water supply for fire fighting
 biodiversity protection
 specific use requirements (including difficult to evacuate, hazardous chemical storage and handling,
essential community infrastructure)
 reconfiguring a lot
Bushfire Management Plans
• Bushfire management plan (BMP) guided by Part 4: Bushfire
PSP
• Prepared by a professional who is suitably qualified and
experienced with specific technical expertise as outlined in
the Bushfire PSP
• BMP pertaining to hazardous materials, further guidance is
provided in the Industrial hazard and risk assessment PSP
Landslide Overlay Policy Comparison
Brisbane City Plan 2000
• No mapping in planning
scheme
• Limited provisions
addressing this
Brisbane City Plan 2014
• New overlay mapping of landslide
susceptibility
• Landslide overlay code, level of
assessment and PSP introduced
• Level of assessment - self assessable
where compliant with acceptable
solutions. No extra applications for most
development
• Main requirement is for a site based
geotechnical report to be signed off by
RPEQ - can be self assessable or
compliance assessable
Landslide Overlay Level of Assessment
• No extra applications for most development, including self
assessment outcomes (Part A)
• Table of assessment triggers:
• earthworks exceeding 50m3 (other than the placement of
topsoil)
• excavation not exceeding 1m deep and 3m long in overlay
area
• filling exceeding 1m in height.
• Storage and handling of dangerous materials exceeding
amounts specified in the Industry code - code assessment
• ROL - code assessment (Table 5.10.14)
Landslide Overlay Code
• Maintains the safety of people and environment on site and neighbouring
sites
• Filling or excavation (also compliance outcomes):
• RPEQ report for filling/excavation (requirements in PSP)
• don’t create risk on neighbouring sites by changing site hydrology.
• Hazardous chemicals - RPEQ report required
• Reconfiguring a lot
• New lots can site buildings and provide access routes without need for
excessive work or change to finished landform to address landslide
• Building footprint not at risk from landslide, including from adjacent
sites
Critical Infrastructure & Movement
Network Overlay Comparison
Brisbane City Plan 2000
• Overlay did not exist
Brisbane City Plan 2014
• New overlay and overlay code
included
• Requirements for critical
infrastructure access and egress to
maintain necessary functionality
during natural disasters
• Affects some other land uses, such
as medium, high impact and
special industry to ensure
appropriate access/egress during
natural disaster events
Critical Infrastructure Movement Network
Overlay
• Assets critical to Brisbane’s ability to respond to
natural disasters
• Remain functional during and immediately
after disaster events
• Are identified and enhanced
• Key transport routes and critical assets required
to mobilise equipment, personnel and supplies to
affected communities, and for evacuation are
connected in a hazard resilient network
• Location of land uses throughout Brisbane
optimised to avoid natural hazards, and ensure
appropriate and efficient access to emergency
and disaster response services
Summary
• Brisbane City Plan 2014 maps and identifies requirements for development
in bushfire prone areas
• Bushfire overlay will not result in extra applications for most development
• Brisbane City Plan 2014 has mapped ‘natural hazard management area’ to
describe Brisbane’s landslide susceptibility areas
• Site based reports required to respond to extent of landslide hazard
• Compliant with requirements of the Single State Planning Policy
• New flood risk management approach applied through FPAs in Brisbane
City Plan 2014
• Flood overlay code provisions ensure that future development contributes to
a safe and flood resilient city