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8.2.11 Flood overlay code

8.2.11.1 Application

(1) This code applies to assessing development in the Flood overlay, if:
(a) accepted development subject to compliance with identified requirements, where acceptable outcomes of this code are identified requirements in a table of assessment for an overlay (section 5.10); or
(b) assessable development where this code is an applicable code identified in the assessment benchmarks column of a table of assessment for an overlay (section 5.10); or
(c) impact assessable development.
(2) Land in the Flood overlay is identified on the Flood overlay map and is included in the following sub-categories:
(a) Brisbane River flood planning area 1 sub-category;
(b) Brisbane River flood planning area 2a sub-category;
(c) Brisbane River flood planning area 2b sub-category;
(d) Brisbane River flood planning area 3 sub-category;
(e) Brisbane River flood planning area 4 sub-category;
(f) Brisbane River flood planning area 5 sub-category;
(g) Creek/waterway flood planning area 1 sub-category;
(h) Creek/waterway flood planning area 2 sub-category;
(i) Creek/waterway flood planning area 3 sub-category;
(j) Creek/waterway flood planning area 4 sub-category;
(k) Creek/waterway flood planning area 5 sub-category;
(l) Overland flow flood planning area sub-category.

Editor's note—For the purposes of the overlay, the Pine and South Pine rivers are treated as Creek/waterway flood planning area sub-categories.

Note—The Flood overlay is a 'natural hazard management area' for the purpose of the State Planning Policy. Within this area, susceptibility to flooding has been identified. The natural hazard area identified on the Flood overlay map may not reflect the full extent of the flood affected area.

(3) When using this code, reference should be made to section 1.5 and section 5.3.3.

Note—The following purpose, overall outcomes, performance outcomes and acceptable outcomes comprise the assessment benchmarks of this code.

Note—Where this code includes performance outcomes or acceptable outcomes that relate to:

Editor’s note—For a proposal to be accepted development subject to compliance with identified requirements, it must meet all the identified acceptable outcomes of this code that relate to the applicable sub-category and any other applicable code. Where it does not meet all identified acceptable outcomes, the proposal becomes assessable development and a development application is required. Where a development application is required, only the specific acceptable outcomes that the proposal fails to meet need to be assessed against the corresponding assessable acceptable outcomes or performance outcomes and relevant overall outcomes. Other identified acceptable outcomes that are met are not assessed as part of the development application.

8.2.11.2 Purpose

(1) The purpose of the Flood overlay code is to:
(a) Implement the policy direction in the Strategic framework, in particular:
(i) Theme 2: Brisbane’s outstanding lifestyle, and Element 2.3 – Brisbane’s healthy and safe communities;
(ii) Theme 4: Brisbane’s highly effective transport and infrastructure networks, and Element 4.3 – Brisbane’s coordinated infrastructure planning and delivery.
(b) Provide for the assessment of the suitability of development in the Flood overlay.
(2) The purpose of the Flood overlay code will be achieved through the following overall outcomes:
(a) Development minimises exposure of people and property to unacceptable risk from flood hazard in all flood events.
(b) Development and infrastructure mitigates the flood risk through its location, siting, design, construction and operation whilst maintaining amenity.
(c) Development does not unduly burden the city's counter-disaster response capacity, including emergency services access during a flood emergency.
(d) Development provides for efficient evacuation and access for evacuation resources including emergency services during flood events, or otherwise plans for the prospect and impact of isolation or hindered evacuation during flooding.
(e) Development involving essential community infrastructure remains functional during and immediately after flood events.
(f) Development ensures that emergency management plans respond to the number and capacity of future users of the development to safely participate in emergency measures such as evacuation.
(g) Development ensures that essential building services or services essential for the development are designed, located and operated to minimise the flood risk to people, minimise damage to property, disruption to building function, and re-establishment time after a flood event.
(h) Development involving hazardous materials manufactured, handled or stored in bulk does not adversely impact on public safety and the environment as a result of the impacts of floodwater.
(i) Development does not, directly or cumulatively, cause or increase adverse impacts on other properties or land within the floodplain from flooding.
(j) Development and infrastructure mitigates the impacts of hydraulic hazard due to predictable future increases in rainfall intensity on flooding.
(k) Development prioritises, in order, the safety of people, protection of public infrastructure and protection of private property, in the management of the economic, social and environmental impacts of flooding.

8.2.11.3 Performance outcomes and acceptable outcomes

Table 8.2.11.3.A—Performance outcomes and acceptable outcomes
Performance outcomes
Acceptable outcomes
Section A—If for accepted development subject to compliance with identified requirements (acceptable outcomes only) or assessable development for a dwelling house including any secondary dwelling

Note—Development for a dwelling house does not require assessment against any other sections of this code.

PO1
Development involving any habitable or non-habitable part of a dwelling house, including any secondary dwelling, is located and designed to:
(a) minimise the risk to people from flood hazard;
(b) achieve acceptable flood immunity;
(c) minimise property impacts from a flood event up to and including the defined flood event;
(d) minimise disruption to residents, recovery time and rebuilding or restoration costs after a flood event up to and including the defined flood event.
AO1.1
Development for a dwelling house including any secondary dwelling:
(a) is not located in the Brisbane River flood planning area 1, 2a or 2b sub-categories or the Creek/waterway flood planning area 1 or 2 sub-categories; or
(b) is only located in these sub-categories, if a Registered Professional Engineer Queensland certifies that the dwelling house and any secondary dwelling are structurally designed to be able to resist hydrostatic and hydrodynamic loads associated with flooding up to and including the defined flood event.
AO1.2
Development for a dwelling house and any secondary dwelling complies with the minimum flood planning levels in Table 8.2.11.3.B.

Note—If located in an area that has no flood level information available from the Council such as an overland flow path, a Registered Professional Engineer of Queensland with expertise in undertaking flood studies is to certify that the flood level and development levels for the dwelling house and any secondary dwelling achieve the required flood planning levels in Table 8.2.11.3.B.

AO1.3
Development involving a building undercroft complies with the minimum clearance requirements in Table 8.2.11.3.E.

Editor's note—For creek/waterway, storm-tide and river flooding, applicable flood planning information is available from Council's FloodWise Property Report.

Note—The Flood planning scheme policy provides guidance on undercroft design.

PO2
Development within the Creek/waterway flood planning area sub-categories or Overland flow flood planning area sub-category:
(a) maintains the conveyance of flood waters to allow flow and debris to pass predominantly unimpeded through the site;
(b) does not concentrate, intensify or divert floodwater onto upstream, downstream or adjacent properties;
(c) will not result in a material increase in flood levels or flood hazard on upstream, downstream or adjacent properties.
AO2
Development:
(a) is not located within the Creek/waterway flood planning area 1, 2 or 3 sub-categories or the Overland flow flood planning area sub-category; or
(b) provides an open undercroft area from natural ground level to habitable floor level for any area inundated by the defined flood event; or

Note—This undercroft area is not suitable for providing non-habitable rooms, secure storage of valuables, or future enclosing for storage or car parking. The clear area may include structural elements such as columns and floor substructure. The Flood planning scheme policy provides guidance on undercroft design.

Editor's note—An open undercroft design may be achieved through a 'valance' treatment around the perimeter of an otherwise internally clear undercroft.

Editor's note—For Creek/waterway, storm-tide and river flooding, applicable flood planning information is available from Council's FloodWise Property Report.

(c) a report from a Registered Professional Engineer Queensland certifies that the development in the Creek/waterway flood planning area or Overland flow flood planning area sub-categories will not result in a material increase in flood level or flood hazard on upstream, downstream or adjacent properties.
Note—Flood studies demonstrate that the development and engineering design methods conform to the principles within the Flood planning scheme policy and the Infrastructure design planning scheme policy.
Section B—If accepted development subject to compliance with identified requirements (acceptable outcomes only) or assessable development other than for a dwelling house or reconfiguring a lot

Note—If development that is accepted development subject to compliance with identified requirements complies with the acceptable outcomes of this part, no further assessment against this code is required.

PO3
Development:
(a) is compatible with flood hazard in a defined flood event;
(b) minimises the risk to people from flood hazard;
(c) does not reduce the ability of evacuation resources including emergency services to access and evacuate the site in a flood emergency, with consideration to the scale of the development;
(d) minimises impacts on property from flooding;
(e) minimises disruption to residents, business or site operations and recovery time due to flooding;
(f) minimises the need to rebuild structures after a flood event greater than the defined flood event.

Note—Where Table 8.2.11.3.C identifies that a flood risk assessment is required, compliance with this performance outcome can be achieved by submitting a flood risk assessment, which may be included within a flood study, addressing the criteria within this performance solution. Preparing flood risk assessments and flood studies is required to be in accordance with the Flood planning scheme policy.

Note—An emergency management plan prepared in accordance with the Flood planning scheme policy, which sets out procedures for evacuation due to flooding may be used to demonstrate compliance with this performance outcome.

AO3
Development for a material change of use is identified in Table 8.2.11.3.C as compatible with the flood hazard in the relevant flood planning area.
PO4
Development for a park ensures that the design of a park and location of structures and facilities responds to the flood hazard and balances the safety of intended users with:
(a) maintaining continuity of operations;
(b) impacts of flooding on asset life and ongoing maintenance costs;
(c) efficient recovery after flood events;
(d) recreational benefits to the city;
(e) availability of suitable land within the park.
AO4.1
Development involving a building or structure in a park complies with the flood planning levels specified in Table 8.2.11.3.D.
AO4.2
Development involving a building or structure in a park where Table 8.2.11.3.D does not apply:
(a) is not located within the 20% AEP flood extent of any creek/waterway or overland flow path; or
(b) is located above the 20% AEP flood level of any creek/waterway or overland flow path.
Section C—If for assessable development other than for a dwelling house
PO5
Development is located and designed to:
(a) minimise the risk to people from flood hazard on the site;
(b) minimise flood damage to the development and contents of buildings up to the defined flood event;
(c) provide suitable amenity;
(d) minimise disruption to residents, recovery time and the need to rebuild structures after a flood event up to and including the defined flood event.
AO5.1
Development complies with the flood planning levels specified in Table 8.2.11.3.D.

Note—If located in an area with no Council-derived flood levels such as an overland flow path, a Registered Professional Engineer Queensland with expertise in undertaking flood studies is to derive the applicable flood level and certify that the development meets the required flood planning levels in Table 8.2.11.3.D. The study is to demonstrate that the development and engineering design methods conform to the principles within the Flood planning scheme policy and the Infrastructure design planning scheme policy.

AO5.2
Development is:
(a) not located in the:
(i) Brisbane River flood planning area 1, 2a, or 2b sub-categories;
(ii) Creek/waterway flood planning area 1 or 2 sub-categories;
(iii) Overland flow flood planning area sub-category; or
(b) only located in these sub-categories if a Registered Professional Engineer Queensland with expertise in undertaking flood studies certifies that:
(i) the development design, siting and any mitigation measures will ensure the development is structurally adequate to resist hydrostatic, hydrodynamic and debris impact loads associated with flooding up to the defined flood event; and
(ii) the risk to people is managed to an acceptable level.
PO6
Development involving essential electrical services or a basement storage area is suitably located and designed to ensure public safety and minimise flood recovery and economic consequences of damage during a flood.
AO6.1
Development ensures that:
(a) all areas containing essential electrical services comply with the flood planning levels in Table 8.2.11.3.D; or
(b) if a basement contains essential electrical services or a private basement storage area, the basement is a waterproof structure with walls and floors impermeable to the passage of water with all entry points and services located at or above the relevant flood planning level in Table 8.2.11.3.D.

Note—A basement storage area does not include a bike storage room, change room, building maintenance storage and non-critical electrical services.

AO6.2
Development involving a basement that relies on a pumping solution to manage floodwater ingress or for dewatering after a flood provides a secondary pump system with a backup power source for the pump.
PO7
Development does not directly or indirectly create a material adverse impact on flood behaviour or drainage on properties that are upstream, downstream or adjacent to the development.
AO7.1
Development:
(a) does not block, or divert floodwaters for any area affected by creek/waterway or overland flow flooding, excluding storm-tide flooding and Brisbane River flooding sources; or
(b) does not result in a material increase in flood level or hydraulic hazard on upstream, downstream or adjacent properties.

Note—Compliance with this acceptable solution can be demonstrated by the submission of a flood study by a Registered Professional Engineer of Queensland with expertise in undertaking flood studies demonstrating that the development and engineering design methods conform to the principles within the Flood planning scheme policy and the Infrastructure design planning scheme policy.

AO7.2
Development retains existing overland flow paths and does not rely wholly on piped solutions to manage major flows.
AO7.3
Development which creates a new overland flow path or significantly modifies an existing overland flow path via earthworks does not materially worsen hydraulic hazard on the site from existing conditions.

Note—Compliance with this acceptable solution can be demonstrated by the submission of a flood study by a Registered Professional Engineer of Queensland with expertise in undertaking flood studies demonstrating that the development and engineering design methods conform to the principles within the Flood planning scheme policy and the Infrastructure design planning scheme policy.

PO8
Development for filling or excavation in an area affected by creek/waterway flooding does not directly, indirectly or cumulatively cause any material increase in flooding or hydraulic hazard or involve significant redistribution of flood storage from high to lower areas in the floodplain.

Note—This can be demonstrated by undertaking earthworks in compliance with the Compensatory earthworks planning scheme policy.

Note—This part of the code applies to all development other than a dwelling house and any secondary dwelling which involves filling or excavation, whether or not the development application comprises a separate development application for operational work involving filling or excavation.

AO8
Development ensures that no filling or excavation greater than 100mm is located in the Creek/waterway flood planning area 1, 2 or 3 sub-categories if contained in the 5% AEP flood extent of any Creek/waterway flood planning area sub-category for which no waterway corridor has been mapped in the Waterway corridors overlay.
PO9
Development ensures that the building and site design:
(a) maintains the conveyance capacity of existing overland flow paths and creek/waterways;
(b) ensures floodwaters and flood debris can pass predominantly unimpeded under a structure or building to minimise property or building damage, including for a flood larger than the defined flood event;
(c) mitigates flood impacts by ensuring that filling, excavation and location of services are designed to allow for the conveyance of floodwater across the site.

Note—The Flood planning scheme policy provides guidance on relevant considerations in determining minimum undercroft clearances and treatment of ground level in undercroft areas where floodwater conveyance is required underneath development.

AO9.1
Development involving a building undercroft in the Creek/waterway flood planning area sub-categories or the Overland flow flood planning area sub-category:
(a) complies with the minimum building undercroft clearance requirements in Table 8.2.11.3.E;
(b) not located directly above any part of a waterway corridor as mapped in the Waterway corridors overlay.
AO9.2
Development involving a building undercroft in the Creek/waterway flood planning area sub-categories or the Overland flow flood planning area sub category:
(a) has a ground level within the undercroft area that is free draining;
(b) does not involve excavation below ground level of more than 300mm within the undercroft area.
PO10
Development for vulnerable uses, difficult to evacuate uses or assembly uses optimises vehicular access and efficient evacuation from the development to parts of the road network unaffected by flood hazard, in order to:
(a) protect safety of users and emergency services personnel;
(b) support efficient emergency services access and site evacuation with consideration to the scale of development.

Note—A flood risk assessment may be required to address the performance outcomes or acceptable solutions which deal with evacuation and isolation arrangements, and the ability to take refuge. The Flood planning scheme policy provides information for undertaking flood risk assessments.

AO10
(a) is not isolated in any event up to the relevant flood planning level specified in Table 8.2.11.3.L; or
(b) has direct vehicle access to a critical route or interim critical route in the Critical infrastructure and movement network overlay for evacuation in a flood; or
(c) can achieve vehicular evacuation to a suitable flood-free location.

Note—A suitable flood-free location is of a size and nature sufficient to provide for the size and characteristics of the population likely to need evacuation to that area.

PO11
Development has access which, having regard to hydraulic hazard, provides for safe vehicular and pedestrian movement and emergency services access to adjoining roads.
AO11.1
Development provides an access or driveway into the site which is:
(a) trafficable during the defined flood event;
(b) not located in the Creek/waterway flood planning area 1 sub-category;
(c) not located in the Overland flow flood planning area sub-category if the hydraulic hazard is unsafe in the defined flood event;
(d) the access or driveway is not inundated by a 10% AEP flood.
AO11.2
Development located in the Creek/waterway flood planning area 1, 2, 3 or 4 sub-categories locates any disabled access in the highest part of the site.

Note—explanation of hydraulic hazard provided in the Flood planning scheme policy.

PO12
Development involving a new road, a bridge or culvert is designed to minimise impacts to flood behaviour, minimise disruption to traffic during a flood and allow for emergency access.
AO12
Development involving a new road complies with the flood planning levels in Table 8.2.11.3.F.
PO13
Development for pedestrian and cyclist paths:
(a) provides a suitable level of trafficability;
(b) manages the impacts of flooding on asset life and ongoing maintenance costs;
(c) balances route availability with recreational and transport connectivity benefits to the city.
AO13.1
Development for cyclist and pedestrian facilities other than on public roads, including those traversing through a park and adjacent to a watercourse and overland flow path, are located above the 39% AEP (2 year ARI) flood immunity from all flooding sources.

Note—If the site is subject to more than one type of flooding, the requirement that affords the greatest level of protection will apply.

AO13.2
All new on-road cyclist and pedestrian facilities comply with the flood planning levels and trafficability standards for the applicable category of road in Table 8.2.11.3.F or Table 8.2.11.3.K.
PO14
Development which increases the residential population within the Brisbane River flood planning area sub-categories minimises the risk to people in all flood events with consideration to flood hazard, including warning time.
AO14
Development in the Brisbane River flood planning area sub-categories in areas where the residential flood level is greater than 12.8m AHD involving:
(a) an increase in the number of residential dwellings; or
(b) additional residential lots
is not subject to an unsafe hydraulic hazard in the 0.2% AEP flood event.

Note—Explanation of a hydraulic hazard is provided in the Flood planning scheme policy.

Additional performance outcomes and acceptable outcomes for essential community infrastructure
PO15
(a) remains functional to serve community need during and immediately after a flood event, or is part of a network that is able to maintain the function of the essential community infrastructure when parts of the development are unable to function during or after a flood;
(b) is designed, sited and operated to avoid adverse impacts on the community or the environment due to the impacts of flooding on infrastructure, facilities or access and egress routes;
(c) is able to remain functional or is part of a network which is able to remain functional even when other infrastructure or services (such as electricity supply) may be compromised in a flood event;
(d) contains mitigation measures which are not entirely dependent on human activation to respond to a flood event.

Note—Protection of function is required up to and including the flood event in Table 8.2.11.3.G.

AO15
Development involving essential community infrastructure:
(a) is ancillary to and not relied upon for the provision of the essential service during a flood; or
(b) is located above the flood planning levels in Table 8.2.11.3.G;
(c) has access to or provides the necessary back-up emergency electricity and communications supply in times of flood;
(d) is designed and constructed to resist hydrostatic and hydrodynamic forces as a result of inundation by the flood event listed for the development type in Table 8.2.11.3.G;
(e) that services a local area:
(i) is able to be accessed in times of flood to service local community needs up to the event listed for that development type in Table 8.2.11.3.G; or
(ii) has a service continuity plan that demonstrates the continued provision of service during the relevant flood event.
Additional performance outcomes and acceptable outcomes if development involves the processes in Table 8.2.11.3.H
PO16
Development involving the storage and handling of hazardous materials avoids or minimises risks to public health and safety and the environment, by:
(a) protecting underground tanks for hazardous materials against the forces of buoyancy, velocity flow and debris impacts;
(b) securing above-ground tanks for hazardous materials against flotation and lateral movement;
(c) preventing damage to hazardous materials pipework or entry of floodwater into hazardous materials pipework;
(d) preventing damage to or off-site release of packages, drums or containers storing hazardous materials.

Note—A chemical hazards flood risk report prepared in accordance with the Management of hazardous chemicals in flood prone areas planning scheme policy can assist in demonstrating achievement of this performance outcome.

Note—A pump drainage system is not an acceptable measure to meet the performance outcome.

AO16
(a) Development does not include the storage or handling of hazardous chemicals that are equivalent to or exceed the threshold quantities in Table 8.2.11.3.M.
(b) Development involving the processes listed in Table 8.2.11.3.H:
(i) where located in the Flood overlay area, occurs only in the Creek/waterway flood planning area 5 sub-category or the Brisbane River flood planning area 5 sub-category; or
(ii) is consistent with the standards contained in the Management of hazardous chemicals in flood prone areas planning scheme policy and can operate without risk of environmental harm during a flood event.

Note—The Management of hazardous chemicals in flood prone areas planning scheme policy sets out further information and processes including risk assessment for the management of hazardous chemicals in flood planning areas.

Additional performance outcomes and acceptable outcomes for reconfiguring a lot
PO17
Development locates and designs all lots resulting from reconfiguring a lot to:
(a) minimise the risk to people from flood hazard;
(b) minimise damage to property from flood hazard;
(c) facilitate safe and efficient evacuation.

Note—

  • Consideration of all floods up to the probable maximum flood is relevant to minimising the risk to people.
  • Flood warning time is not considered sufficient in the Creek/waterway planning area sub-categories or the Overland flow flood planning area sub-category.
  • Filling above the flood planning level for a flood event greater than the defined flood event cannot be assumed to mitigate the flood hazard.
AO17.1
Development creating new lots is identified in Table 8.2.11.3.I as suitable within the relevant flood planning area.
AO17.2
Development provides for reconfiguring a lot design that achieves a road and lot layout which:
(a) provides trafficable vehicular egress for evacuation during a defined flood event;
(b) optimises hazard-free movement away from sources of flood hazard within the development.

Note—Further advice on road and lot layout is contained in the Flood planning scheme policy.

AO17.3
Development which creates a new residential lot in an area subject to Brisbane River flooding, if the residential flood level is greater than 12.8m AHD is not subject to a hydraulic hazard greater than 0.6m2/s DV or 0.6m deep in a 0.2% AEP flood.

Note—Refer to the Flood planning scheme policy for further explanation on the 0.2% AEP flood.

PO18
Development involving reconfiguring a lot:
(a) minimises the risk to people from flood hazard;
(b) creates safe evacuation routes or avoids isolation of the development during a flood greater than the defined flood event;
(c) minimises damage to property and services;
(d) provides lots and roads that are not frequently flooded or subject to nuisance ponding or seepage;
(e) ensures lots created for park or private open space minimise the risk to people from flood hazard and are fit for purpose;
(f) provides a lot that is not substantially burdened by flood mitigation infrastructure.
AO18.1
Development involving reconfiguring a lot ensures:
(a) all lots comply with the flood planning levels in Table 8.2.11.3.J;
(b) a new road complies with the flood planning levels in Table 8.2.11.3.F.
AO18.2
Development involving reconfiguring a lot creating more than 6 residential lots or a lot for industry ensures the flood planning levels of a dedicated road fronting the development or providing primary access within 200m of the development:
(a) complies with Table 8.2.11.3.K; or
(b) has acceptable trafficability in accordance with the requirements in the Flood planning scheme policy and the Queensland Urban Drainage Manual.

Note—The Flood planning scheme policy contains supporting information about trafficability on existing roads and serviceability during floods.

AO18.3
Development protects the conveyance of flood hazard area by providing an easement over the:
(a) 2% AEP flood extent for overland flow flooding;
(b) 1% AEP flood extent for creek/waterway flooding.
Table 8.2.11.3.B—Flood planning levels for a dwelling house (BCA building classification 1a)
Flooding source
Minimum habitable floor level
Minimum non-habitable floor level
(i.e. utility areas, garage, laundry,
storage room and basement entries)
Brisbane River
RFL + 500mm
2% AEP flood level + 300mm
Creek/waterway
1% AEP flood level + 500mm
1% AEP flood level + 300mm
Overland flow
2% AEP flood level + 500mm
2% AEP level + 300mm

Note—Where no detailed flood level information is available from the Council such as an overland flow path, a Registered Professional Engineer Queensland with expertise in flood studies is to derive the relevant flood level and certify that the development level for the dwelling house, including any secondary dwelling, meets the required flood immunity standards.

Note—

Table 8.2.11.3.C—Land use compatibility with flood hazard

C – Land use is compatible with the flood hazard subject to meeting all other relevant requirements.

# – Flood risk assessment in accordance with requirements of the Flood planning scheme policy is required to demonstrate the use is compatible with the flood hazard.

Accommodation activities
Brisbane River
flood planning area
sub-category
Creek/waterway
flood planning area
sub-category
Overland flow
flood planning area
sub-category
 
5
4
3
2B
2A
1
5
4
3
2
1
 
C
#
#
#
#
#
C
#
#
#
#
#
C
C
#
#
#
#
C
#
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
C
#
#
#
C
#
#
#
#
C
C
C
C
#
#
#
C
#
#
#
#
C
C
#
#
#
#
#
C
#
#
#
#
C
#
#
#
#
#
#
#
#
#
#
#
#
C
C
C
#
#
#
C
#
#
#
#
C
C
#
#
#
#
#
#
#
#
#
#
C
hotel where including accommodation (1–3 storeys)
C
C
#
#
#
#
C
#
#
#
#
C
hotel where including accommodation (4+ storeys)
C
C
C
#
#
#
C
#
#
#
#
C
C
C
#
#
#
#
C
C
#
#
#
C
Commercial land uses
Brisbane River
flood planning area
sub-category
Creek/waterway
flood planning area
sub-category
Overland flow
flood planning area
sub-category
 
5
4
3
2B
2A
1
5
4
3
2
1
 
C
C
#
#
#
#
C
#
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
C
C
C
C
C
C
C
#
#
C
Car park ancillary to another use
C
C
C
C
C
#
C
C
#
#
#
C
C
C
C
C
C
#
C
C
#
#
#
C
C
C
#
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
C
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
Hotel (where not including accommodation)
C
C
#
#
#
#
C
#
#
#
#
C
C
C
C
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
#
#
#
#
C
C
#
#
#
C
C
C
C
C
C
#
C
C
#
#
#
C
C
C
C
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
#
#
#
#
#
C
#
#
#
#
C
C
C
#
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
C
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
C
C
C
C
C
C
C
#
#
C
Community land uses
Brisbane River
flood planning area
sub-category
Creek/waterway
flood planning area
sub-category
Overland flow
flood planning area
sub-category
 
5
4
3
2B
2A
1
5
4
3
2
1
 
C
#
#
#
#
#
C
#
#
#
#
#
C
C
#
#
#
#
C
C
#
#
#
C
C
#
#
#
#
#
C
#
#
#
#
C
C
#
#
#
#
#
C
C
#
#
#
C
(and outdoor education centre)
C
#
#
#
#
#
C
#
#
#
#
C
C
C
C
C
C
C
C
C
C
C
C
C
C
#
#
#
#
#
C
#
#
#
#
C
#
#
#
#
#
#
#
#
#
#
#
#
C
C
#
#
#
#
C
C
#
#
#
C
C
#
#
#
#
#
C
C
#
#
#
C
C
C
C
#
#
#
C
C
C
#
#
C
C
C
C
#
#
#
C
C
#
#
#
C
C
C
C
C
C
C
C
C
C
C
C
C
C
#
#
#
#
#
C
C
#
#
#
C
Special purpose land uses
Brisbane River
flood planning area
sub-category
Creek/waterway
flood planning area
sub-category
Overland flow
flood planning area
sub-category
 
5
4
3
2B
2A
1
5
4
3
2
1
 
C
#
#
#
#
#
C
#
#
#
#
C
C
C
C
#
#
#
C
C
#
#
#
C
C
#
#
#
#
#
C
#
#
#
#
C
#
#
#
#
#
#
#
#
#
#
#
C
#
#
#
#
#
#
#
#
#
#
#
#
C
#
#
#
#
#
C
#
#
#
#
C
C
C
C
C
C
C
C
C
C
C
#
C
#
#
#
#
#
#
#
#
#
#
#
#
C
C
C
#
#
#
C
C
C
C
#
C
C
#
#
#
#
#
C
#
#
#
#
#
C
#
#
#
#
#
C
#
#
#
#
#
C
#
#
#
#
#
#
#
#
#
#
#
Industry land uses
Brisbane River
flood planning area
sub-category
Creek/waterway
flood planning area
sub-category
Overland flow
flood planning area
sub-category
 
5
4
3
2B
2A
1
5
4
3
2
1
 
C
C
C
#
#
#
C
C
C
#
#
C
C
C
#
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C
C
C
C
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
C
#
#
#
C
C
C
C
#
#
#
C
C
#
#
#
C
C
C
#
#
#
#
C
C
#
#
#
C
C
#
#
#
#
#
C
#
#
#
#
C
C
C
C
C
C
C
C
C
C
#
#
C
C
C
#
#
#
#
C
C
#
#
#
C
C
#
#
#
#
#
C
#
#
#
#
C
C
#
#
#
#
#
#
#
#
#
#
C
C
#
#
#
#
#
C
#
#
#
#
C
C
C
#
#
#
#
C
#
#
#
#
C

Note—Caretaker’s accommodation and home-based business are considered ancillary to the dominant land use.

Table 8.2.11.3.D—Flood planning categories for development types
BCA building classification(1)
Development types and design levels, assigned design floor or pavement levels
Category – refer to Table 8.2.11.3.L for flood planning levels
Class 1–4
Category A
Non-habitable room including patio and courtyard
Category B
Non-habitable part of a Class 2 or Class 3 building excluding the essential services(2) control room
Category B
Risk management approach to Brisbane River flooding is permitted (refer to Flood planning scheme policy)
Parking located in the building undercroft of a multiple dwelling
Category C
Carport(4), unroofed car park; vehicular manoeuvring area
Category D
Essential electrical services(2) of a Class 2 or Class 3 building only
Category A(6)
Basement parking entry(3)
Category C + 300mm
Class 5,
Class 6, or
Class 8
Building floor level
Category C
Risk management approach to Brisbane River flooding is permitted (refer to Flood planning scheme policy)
Garage or car park located in the building undercroft(3)
Category C
Carport(4) or unroofed car park
Category D
Vehicular access and manoeuvring areas
Category D
Basement parking entry(3)
Category C
Essential electrical services(2)
Class 8 – Category C(6)
Class 5 & 6 – Category A(6)
Class 7a
Refer to the relevant building class specified in this table
Class 7b
Building floor level
Category C
Risk management approach to Brisbane River flooding is permitted (refer to Flood planning scheme policy)
Vehicular access and manoeuvring area
Category D
Essential electrical services(2)
Category C
Class 9
Building floor level
Category A
Building floor level for habitable rooms in Class 9a or 9c where for a residential care facility
0.2% AEP flood
Building floor level for habitable rooms in Class 9b where involving children, such as a child care centre
0.2% AEP flood
Garage or car park located in the building undercroft(3)
Category C
Carport(5) or unroofed car park
Category D
Vehicular access and manoeuvring areas
Category D
Essential electrical services(2)
Category A
Class 10a
Car parking facility
Refer to the relevant building class specified in this table
Shed(5) or the like
Category D
Class 10b
Swimming pool
Category E
Associated mechanical and electrical pool equipment
Category C
Other structures
Flood planning levels do not apply

Notes—

(1) Refer to the Building Code of Australia for definitions of building classifications.

(2) Essential electrical services include any area or room used for fire control panel, telephone PABX, sensitive substation equipment including transformers, low voltage switch gear, high voltage switch gear, battery chargers, protection control and communication equipment, low voltage cables, high voltage cables, and lift or pump controls.

(3) Basement car parks must be suitably waterproofed and all air vents, air-conditioning ducts, pedestrian access and entry and exit ramps into the basement must comply with the applicable flood planning levels in this table.

(4) A shelter for a motor vehicle, which has a roof and one or more open sides, and which can be built against the side of a building.

(5) A slight or rough structure built for shelter and storage; or a large strongly built structure, often open at the sides or end.

(6) Where essential electrical services are proposed in a basement below the specified flood planning level, the flood immunity of all air vents, air-conditioning ducts, pedestrian access, lift shafts and entry/exit ramps at the basement entrance and any other openings into that basement must conform with the flood planning levels for Category A for Residential development, and the relevant basement entry level of all other uses. To ensure flood immunity,basements require a waterproof basement design to prevent flood waters entering the basement.

Table 8.2.11.3.E— Building undercroft clearances
Flooding source
Minimum clearance requirement(1)(3)
Overland flow– Hydraulic Hazard (DV <0.6 m2/s and depth <600mm in 2% AEP flood event)
Lowest floor level is to be 1.5m(2) above the highest ground elevation in undercroft area
Overland flow– Hydraulic Hazard (DV >0.6 m2/s or depth >600mm in 2% AEP flood event)
Lowest floor level is to be 2.5m(2) above the highest ground elevation in undercroft area
Creek/waterway (Flood planning area 1, 2 or 3 sub-categories)
Lowest floor level is to be 2.5m(2) above the highest ground elevation in undercroft area
Creek/waterway (Flood planning area 4 sub-category)
Lowest flood level is to be 1.5m (2) above the highest ground elevation in undercroft area

Notes—

(1) The minimum undercroft only relates to the minimum clearance requirements from ground level to the finished floor level and not minimum flood planning levels. Where the flood planning level requirement with freeboard results in a higher finished floor level that higher level needs to be adopted.

(2) Refer to the Flood planning scheme policy for explanatory material regarding clearances and considerations.

(3) The minimum undercroft clearance only applies to the area of undercroft above the relevant flood extent or flood planning area sub-category.

Table 8.2.11.3.F—Flood planning levels for a new road
Flooding source(1)
Minimum design levels at the crown of the road (m AHD)(2)
Residential development
Industrial or commercial development
Brisbane River(3)
Defined flood level
5% AEP flood level
Creek/waterway
1% AEP flood level
2% AEP flood level
Overland flow
2% AEP flood level
2% AEP flood level

Notes—

(1) Where the road is subject to more than one flooding source, the minimum flood planning level is the highest level determined from these sources.

(2) Where flood levels are not available from Council's FloodWise Property Report, such as for overland flow flooding, a suitably qualified Registered Professional Engineer Queensland with expertise in undertaking flood studies is required to estimate the relevant flood level.

(3) A risk management approach determining flood planning levels of roads for Brisbane River flooding can be applied as an alternative to Table 8.2.11.3.F. Typically such roads would have a flood immunity no worse than the surrounding roads that support a similar land use, otherwise a Flood Risk Assessment which complies with the relevant requirements of the Flood planning scheme policy is provided.

Table 8.2.11.3.G—Flood planning levels for essential community infrastructure
Minimum design levels
0.2% AEP flood
Emergency services, where for an emergency shelter
0.5% AEP flood
Emergency services, where for police facilities
0.5% AEP flood
Hospital and health care service where associated with a hospital
0.2% AEP flood
Community facility where involving storage of valuable records or items of historic or cultural significance (e.g. galleries and libraries)
0.5% AEP flood
State-controlled roads
Major or minor electricity infrastructure not otherwise listed in this table
Utility installation where for rail transport services
No specific recommended level but development proponents should ensure that the infrastructure is optimally located and designed to achieve suitable levels of service, having regard to the processes and policies of the administering government agency.
Power stations (as defined in the Electricity Act 1994) or renewable energy facility.
0.2% AEP flood
Major electricity infrastructure where a major switch yard
0.2% AEP flood
0.5% AEP flood
Utility installation where for a sewage treatment plant
Utility installation where for a water treatment plant
0.5% AEP flood

Note—A flood event with an AEP of 0.2% is the equivalent of a 500 year ARI flood event.

Note—A flood event with an AEP of 0.5% is the equivalent of a 200 year ARI flood event.

Table 8.2.11.3.H—Table of processes requiring additional assessment in a flood planning area
Process
(1) Oil refining or processing
(2) Producing, refining or processing gas or fuel gas
(3) Power station, including the activity of generating electricity by using fuel
(4) Producing, quenching, cutting, crushing or grading coke
(5) Waste incinerator, including thermal treatment of waste
(6) Pulp or paper manufacturing
(7) Tannery or works for curing animal skins, hides or finishing leather
(8) Textile manufacturing, including carpet manufacturing, wool scouring or carbonising, cotton milling, or textile bleaching, dyeing or finishing
(9) Rendering plant, including meat processing
(10) Manufacturing chemicals, poisons and explosives
(11) Manufacturing fertilisers involving ammonia
(12) Manufacturing polyvinyl chloride plastic
(13) Major hazard facilities for the storage and handling of dangerous goods
(14) Storage of hazardous chemicals in quantities that would be equivalent to or exceed the threshold quantity set out in Table 8.2.11.3.M
(15) Manufacturing medium-density fibreboard, chipboard, particle board, plywood, laminated board or wood veneer products
(16) Manufacturing or processing plaster
(17) Enamelling workshop
(18) Galvanising works
(19) Anodising or electroplating workshop
(20) Powder coating workshop
(21) Treating timber for preservation using chemicals including copper, chromium, arsenic, borax and creosote
(22) Manufacturing soil conditioners by receiving, blending, storing, processing, drying or composting organic material or organic waste, including animal manures, sewage, septic sludges and domestic waste
(23) Manufacturing tyres, asbestos products, asphalt, cement, glass or glass fibre, mineral wool or ceramic fibre
(24) Abattoir, including meat processing
(25) Recycling chemicals, oils or solvents
(26) Waste disposal activity (other than waste incinerator), including waste transfer station operation
(27) Recycling, storing or reprocessing regulated waste, including regulated waste treatment
(28) Manufacturing batteries and battery recycling
(29) Drum and container reconditioning
(30) Water treatment
(31) Sewage treatment
Table 8.2.11.3.I—Suitability of reconfiguring a lot within a flood planning area

C – Reconfiguring a lot is suitable within a flood planning area

# – Flood risk assessment in accordance with the requirements of the Flood planning scheme policy is required to demonstrate the mitigation of risk from flood hazard

Flood planning area
Creek/waterway flood planning area
sub-categories
Brisbane River flood planning area
sub-categories
Residential
Industrial
Other
Residential
Industrial
Other
1
#
#
#
#
#
#
2/2a;2b
#
#
#
#
C
#
3
#
#
#
#
C
C
4
C
C
C
C
C
C
5
C
C
C
C
C
C

Notes—

Table 8.2.11.3.J—Flood planning levels for reconfiguring a lot
Flooding source(1)
Minimum lot levels (m AHD)(2)
Residential (creating 6 or less lots with no new road)
Residential (creating more than 6 lots), or a new road
Other than residential
Brisbane River
2% AEP flood level + 300mm
RFL + 0.3m
1% AEP flood level
Creek/waterway
Minimum 300m2 area at the 1% AEP flood level + 300mm(3)
1% AEP flood level + 300mm
2% AEP flood level
Overland flow
Minimum 300m2 area at the 2% AEP flood level + 300mm(3)
2% AEP flood level + 300mm
2% AEP flood level

Notes—

(1) Where the site is subject to more than one flooding source, the minimum flood planning level is the highest level determined from these sources.

(2) Where flood levels are not available from Council's FloodWise Property Report such as for overland flow flooding, a suitably qualified Registered Professional Engineer Queensland with expertise in undertaking flood studies is required to estimate the relevant flood level.

(3) The 300m2 area is considered suitable for siting a dwelling house with open space area at or above the nominated flood planning level.

Table 8.2.11.3.K—Flood planning levels for existing road providing access to or fronting a development
Flooding source(1)
Minimum design levels at the crown of the road (m AHD)(2)(3)
Brisbane River
5% AEP flood level
2% AEP flood level
2% AEP flood level
Creek/waterway
5% AEP flood level
2% AEP flood level
2% AEP flood level
Overland flow
5% AEP flood level
5% AEP flood level
5% AEP flood level

Notes—

(1) Where the site is subject to more than one flooding source, the minimum flood planning level is the highest level determined from these sources.

(2) Where flood levels are not available from Council's FloodWise Property Report such as overland flow flooding a suitably qualified Registered Professional Engineer in Queensland with expertise in undertaking flood studies is required to estimate the relevant flood level. The Flood planning scheme policy sets out the requirements for a flood risk assessment process.

(3) The design standard for industry access is the 5% AEP flood level for all flooding sources.

Table 8.2.11.3.L—Categories of flood planning levels
Flooding source(1)
Minimum design floor or pavement levels (m AHD)(2)
(refer to Table 8.2.11.3.D for assignment of these categories)
Category A
Category B
Category C
Category D
Category E
Brisbane River
+ 500mm
RFL
+ 300mm
5% AEP flood level
5% AEP flood level
Creek/
waterway
1% AEP flood level
+ 500mm
1% AEP flood level
+ 300mm
1% AEP flood level
1% AEP flood level
5% AEP flood level
Overland flow
2% AEP flood level
+ 500mm
2% AEP flood level
+ 300mm
2% AEP flood level
2% AEP flood level
5% AEP flood level

Notes—

(1) Where the site is subject to more than one type of flooding that is overland flow flooding, creek or waterway flooding or river flooding, the minimum flood immunity level is the highest level determined from these sources.

(2) Where flood levels are not available from Council's FloodWise Property Report such as overland flow flooding, the applicant will need to engage a suitably qualified Registered Professional Engineer Queensland with expertise in undertaking flood studies required to estimate the relevant flood level. The Flood planning scheme policy sets out the requirements for a flood risk assessment process.

Table 8.2.11.3.M—Threshold quantities for hazardous chemicals
Item
Description of hazardous chemical
Threshold quantity
1
Flammable gases
Category 1
5,000L
2
Gases under pressure
With acute toxicity,
categories 1, 2, 3 or 4
500L
3
 
With skin corrosion
categories 1A, 1B or 1C
500L
4
 
Aerosols
10,000L
5
 
Not stated elsewhere in this table
10,000L
6
Flammable liquids
Category 1
500L
7
 
Category 2
2,500L
8
 
Category 3
10,000L
9
 
Any combination of chemicals from items 6 to 8 where none of the items exceeds the threshold quantities on their own
10,000L
10
 
Category 4
100,000L
11
Self-reactive substances
Type A
50kg or 50L
12
 
Type B
500kg or 500L
13
 
Type C to F
2,500kg or 2,500L
14
Flammable solids
Category 1
2,500kg
15
 
Category 2
10,000kg
16
 
Any combination of chemicals from items 12 to 15 where none of the items exceeds the threshold quantities on their own
10,000kg or 10,000L
17
Pyrophoric liquids and pyrophoric solids
Category 1
500kg or 500L
18
Self-heating substances and mixtures
Category 1
2,500kg or 2,500L
19
 
Category 2
10,000kg or 10,000L
20
 
Any combination of chemicals from items 17 to 19 where none of the items exceeds the threshold quantities on their own
10,000kg or 10,000L
21
Substances which in contact with water emit flammable gas
Category 1
500kg or 500L
22
 
Category 2
2,500kg or 2,500L
23
 
Category 3
10,000kg or 10,000L
24
 
Any combination of chemicals from items 21 to 23 where none of the items exceeds the threshold quantities on their own
10,000kg or 10,000L
25
Oxidising liquids and oxidising solids
Category 1
500kg or 500L
26
 
Category 2
2,500kg or 2,500L
27
 
Category 3
10,000kg or 10,000L
28
 
Any combination of chemicals from items 25 to 27 where none of the items exceeds the threshold quantities on their own
10,000kg or 10,000L
29
Organic peroxides
Type A
50kg or 50L
30
 
Type B
500kg or 500L
31
 
Type C to F
2,500kg or 2,500L
32
 
Any combination of chemicals from items 30 and 31 where none of the items exceeds the threshold quantities on their own
10,000kg or 10,000L
33
Acute toxicity
Category 1
500kg or 500L
34
 
Category 2
2,500kg or 2,500L
35
 
Category 3
10,000kg or 10,000L
36
 
Any combination of chemicals from items 33 to 35 where none of the items exceeds the threshold quantities on their own
10,000kg or 10,000L
37
Skin corrosion
Category 1A
500kg or 500L
38
 
Category 1B
2,500kg or 2,500L
39
 
Category 1C
10,000kg or 10,000L
40
Corrosive to metals
Category 1
10,000kg or 10,000L
41
 
Any combination of chemicals from items 37 to 40 where none of the items exceeds the threshold quantities on their own
10,000kg or 10,000L

Notes—

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