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water quality code
9.4.8 Water Quality and Drainage Code
9.4.8.1 Application
(1) This code applies to assessable development identified as requiring assessment against the Water Quality and Drainage code
by the tables of assessment in Part 5 (Tables of assessment).
(2) All provisions in this code are assessment benchmarks for applicable assessable development
9.4.8.2 Purpose and overall outcomes
(1) The purpose of the Water Quality and Drainage code is to ensure development is planned, designed, constructed and operated to
manage wastewater, stormwater, groundwater and environmental flows and as part of an integrated water cycle in ways that
protect environmental values, water quality and public health.
(2) The overall outcomes sought for the Water quality and drainage code are:
(a) Waterways, wetlands, drainage lines, receiving environments and other ecologically important areas are protected and
enhanced by managing the quality and quantity of stormwater runoff from development in accordance with best practice;
(b) Stormwater drainage systems are designed and constructed to effectively manage or convey stormwater in a way that
protects people, property and the natural environment;
(c) Stormwater infrastructure and treatment systems are compatible with existing infrastructure and are designed and
constructed to be cost effective across their design life;
(d) Stormwater design and management incorporates consideration of climate change impacts to ensure the intended
function and capacity of the stormwater infrastructure and treatment systems are maintained over time;
(e) Stormwater infrastructure provides an appropriate level of flood immunity for roads based on desired standards of service
identified for different flood hazard areas;
(f) Stormwater treatment systems are visually integrated into all development designs in a manner that incorporates natural
features and habitats, as well as education opportunities to raise awareness of the connection of the development to its
receiving waters;
(g) Stormwater treatment systems are multifunctional providing for stormwater conveyance, protection of ecologically important
areas, passive recreation and erosion and sediment control;
(h) Hydrologic regimes are maintained to predevelopment conditions to maintain waterway stability, protect ecology and
groundwater dependent ecosystems, maintain suitable fish passage, and mitigate flood risk to people and property; and
(i) Development is designed, constructed and operated to facilitate erosion and drainage control and avoid release of
prescribed water contaminants into receiving waters.
Table 9.4.8.3 Criteria for assessment
Stormwater drainage design Table 9.4.8.3 Criteria for assessment (part)
Performance Outcomes Acceptable Outcomes
Stormwater drainage design
PO1 AO1
The development and its stormwater management system is A stormwater management plan is prepared consistent
planned and designed having regard to: with PSP6 Engineering Design Standards Roads, drainage
(a) the natural features of the site; and earthworks.
(b) the need to avoid impacts and potential risks to ecologically
important areas;
Able to Comply
(c) the likely effectiveness of erosion and sediment control and
stormwater drainage measures during rainfall events
during and post construction; and
(d) the need to protect environmental values and water quality
of receiving waters both during and post construction.
PO2 AO2.1
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Performance Outcomes Acceptable Outcomes
Stormwater drainage infrastructure is planned, designed and Stormwater drainage planning, design and construction is in
constructed to: accordance with PSP6 Engineering Design Standards Roads,
(a) incorporate allowance for increased flood risk and tidal drainage and earthworks and the latest version of the
inundation through pipework as a result of cilmate change Queensland Urban Drainage Design Manual.
and sea level rise; Able to Comply
(b) ensure the development is adequately drained; and AO2.2
The stormwater drainage system connects to a lawful point of
(c) ensure stormwater is managed and lawfully discharged discharge in accordance with PSP6 Engineering Design
without altering stormwater drainage characteristics
external to the site. Standards Roads, drainage and earthworks.
Able to Comply - water continues to
AO2.3 flow to creek (legal point of discharge)
Stormwater flows discharging from the development are
demonstrated to be consistent with predevelopment
characteristics.
Able to Comply - water continues to
flow to creek (legal point of discharge)
AO2.4
Development provides for the management of stormwater to
incorporate appropriate allowance for climate change impacts
(including rainfall intensity and sea level rise), in accordance with
PSP6 Engineering Design Standards – Roads, Drainage and
Earthworks. Able to Comply - water continues to
flow to creek (legal point of discharge)
PO3 AO3.1
Stormwater drainage infrastructure conveys runoff in a manner Stormwater drainage infrastructure meets the desired standards
that allows roads to deliver desired standards of service of service for roads functionality set out in PSP6 Engineering
appropriate to the local conditions and local stormwater drainage Design Standards Roads, Drainage and Earthworks.
characteristics. Able to Comply - no impacts to roads
PO4 AO4.1
Stormwater infrastructure is compatible with existing The location, design and construction of stormwater drainage
infrastructure, allows for easy access for the ongoing structures is in accordance with PSP6 Engineering Design
maintenance by Council, is cost effective across its design life. Standards Roads, drainage and earthworks.
Able to Comply
AO4.2
Where infrastructure is located on private land an easement is
dedicated over the infrastructure in accordance with PSP6
Engineering Design Standards Roads, drainage and
earthworks.
Not Applicable - related to new infrastructure
AO4.3
Any alterations or repairs to infrastructure as a result of the
development are made at no cost to Council.
Not Applicable - related to new infrastructure
AO4.4
Development avoids stormwater inflow and infiltration to the
sewer infrastructure network.
Not Applicable - Drains away from sewer
AO4.5
Stormwater infrastructure is designed to minimise maintenance
costs and the requirement for specialized equipment for
maintenance techniques.
Not Applicable - related to new infrastructure
PO5 AO5.1
Stormwater drainage infrastructure is aligned to avoid crossing Stormwater drainage infrastructure avoids crossing waterways,
waterways, wetlands, drainage lines and ecological important wetlands drainage lines and ecologically important areas or
areas, or where it is demonstrated this is unavoidable, disturbed follows the edge of existing disturbed areas.
areas are reinstated and revegetated upon completion of works.
Able to Comply
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Performance Outcomes Acceptable Outcomes
AO5.2
Stormwater drainage infrastructure is colocated with other
infrastructure within a combined utility corridor where appropriate.
Not Applicable - related to new infrastructure
AO5.3
Temporary vehicular crossings of waterways must be designed
and constructed to be consistent with the current International
Erosion Control Association Best Practice Book Series.
Able to Comply
Stormwater quality and protection of receiving waters Table 9.4.8.3 Criteria for assessment (part)
Performance Outcomes Acceptable Outcomes
Stormwater quality and protection of receiving waters
PO6 AO6.1
Development is located, designed, constructed and operated to Stormwater runoff discharging into High Ecological Value waters
protect and enhance environmental values and water quality of as a result of development causes no increase in gross
waterways, wetlands, lakes, ground waters and drainage pollutants, total suspended solids, total phosphorous or total
systems. nitrogen compared to a predevelopment scenario.
AND Able to Comply
Editor’s note: Environmental values of waters and water quality
objectives are prescribed in Schedule 1 of the Environmental AO6.2
Protection (Water) Policy 2009 and are identified on the State All stormwater runoff is treated to achieve maximum removal of
Planning Policy Interactive Mapping System. nutrients, gross pollutants and suspended solids as determined
by cost to efficiency ratios. (e.g. bioretention basins must be sized
to achieve at least 80% reduction in total suspended solids, 60%
reduction in total phosphorous, 45% reduction in total nitrogen
and 90% reduction in gross pollutants >5mm).
OR Able to Comply
AO6.3
Developments achieve a minimum 3 drop rating consistent with
the Water by Design Living Waterways Scoring Guide (Healthy
Land and Water).
Able to Comply
Editor’s note— PSP6 Engineering Design Standards Roads,
Drainage and Earthworks provides guidance on stormwater
design and modelling requirements. Able to Comply
PO7 AO7.1
Water quality treatment systems use natural processes and Water quality treatment systems are designed to be integrated
materials, whenever possible, and are integrated into into the landscape consistent with the technical design guideline
development to enhance biodiversity and landscape benefits. published by Healthy Land and Water Water by Design for the
feature. (eg. For Bioretention Basins: Bioretention Technical
Design Guidelines (October 2014) and for Wetland Systems the
Wetland Technical Design Guideline (May 2017).
Not Applicable - related to new infrastructure
PO8 AO8.1
Water quality treatment infrastructure to be dedicated as Detailed life cycle costing is provided for the entire treatment train
public assets are proven to be suitable for its use and of a system including replacement costs of asset parts.
cost effective and efficient standard. Not Applicable - related to new infrastructure
AO8.2 Treatment systems dedicated as public assets are
designed to minimise maintenance, renewal and adaption costs
and the requirement for specialised equipment, material or
maintenance techniques.
Not Applicable - related to new infrastructure
AO8.3
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Performance Outcomes Acceptable Outcomes
Vegetated stormwater management systems to be dedicated as
public assets are established and maintained during the
maintenance period to ensure optimal vegetated growth and that
the functional elements of the system achieve the design function
at the end of the maintenance period.
Not Applicable - related to new infrastructure
PO9 AO9.1
Treatment systems are designed to eliminate or minimise health, Free draining inlets and outlets are provided to ensure that waters
safety and aesthetic hazards, including risks associated with do not pond for more than 24 hours.
insect breeding, odour and public safety. Able to Comply
AO9.2
Developments are designed to eliminate retaining walls in excess
of 0.8m for any water quality treatment device.
Able to Comply
Hydrology and waterway stability Table 9.4.8.3 Criteria for assessment (part)
Performance Outcomes Acceptable Outcomes
Hydrology and waterway stability
PO10 AO10
Development prevents increased bed and bank erosion and The development is designed to:
sedimentation in receiving waterways by avoiding changes in low (a) limit the peak 1 year ARI event discharge within the
rate, peak flow runoff and flow duration. receiving waterway to the predevelopment peak 1 year
discharge;
(b) maximise pervious areas by using pervious alternatives for
otherwise impervious areas wherever possible;
(c) provide for capture and reuse of stormwater for nonpotable
purposes for gardening, toilet flushing, laundry and hot
water supply uses;
(d) incorporate appropriate detention features; and
(e) incorporate natural channel design principles
Able to Comply
Editor’s note: The Sustainable Building Design Code includes
requirements for stormwater capture and reuse.
PO11 AO11.1
Water sensitive urban design principles are applied to achieve The design and construction ofAble to Comply
a natural channel or natural
multifunctional design of waterways, wetlands and drainage lines channel rehabilitation works are in accordance with the Natural
that provide for: Channel Design Guidelines (Brisbane City Council) having regard
(a) stormwater conveyance that uses natural channel design; to local topography, geology and geomorphology.
(b) protection of landscape features and ecological important Able to Comply
AO11.2
areas including terrestrial and aquatic habitat;
Landscape features, plant species and habitat types used in
(c) aesthetic and passive recreation values; stormwater conveyance channels are complementary to the local
(d) flood management and conveyance of external catchment context and natural waterways.
stormwater through the development; Able to Comply
AO11.3
(e) landscaping that incorporates local native species; and
Bank and bed stability and planting densities result in a stable
(f) bed and bank stability. channel over the long term and minimal potential for pest plant
species.
Able to Comply
AO11.4
Water Sensitive Design measures are incorporated into the
development, as detailed in the document Water Sensitive
Designs small improvements, new ideas, concepts and sketch
designs for stormwater filtration systems (Healthy Waterways
Water by Design).
Able to Comply
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Performance Outcomes Acceptable Outcomes
AO11.5
Floodplain management is designed in accordance with the
Framework for the Integration of Flood and Stormwater
Management into Open Space published by Healthy Waterways
Water by Design (version current at the time of development
application) Able to Comply
PO12 AO12.1
Development protects instream ecology by maintaining pre Where runoff from or within the site passes through or drains to
development low flow discharge regimes and maintaining fish natural channels, waterways or wetlands, development protects in
passages. steam ecology by maintaining predevelopment low flow
discharge regimes in accordance with the frequent flow
management objectives in PSP6 Engineering Design Standards
Roads, drainage and earthworks
Able to Comply
AO12.2
Instream structures such as roads, bridges, culverts, and other
stormwater infrastructure do not cause barriers to fish passage
and facilitate the movement of terrestrial and aquatic fauna along
waterway corridors.
Not Applicable - related to new infrastructure
AO12.3
Benthic substrate retains a continuous grade with the direction
of flow consistent with the natural bed profile. Able to Comply
PO13 AO13.1
Development is designed and constructed to maintain surface The location and form of stormwater discharge points do not alter
and ground water balances that sustain the environmental values the predevelopment hydrology of receiving surface water or
of water dependent ecosystems, including downstream aquatic, groundwater. Able to Comply - minimal changes onsite only
riparian, wetland and terrestrial ecosystems. affecting the onsite small swales to convey water
AO13.2 to creek (legal point of discharge).
Developments located on groundwater recharge or discharge
areas are designed and managed in accordance with a
groundwater recharge and discharge management plan prepared
by a suitably experienced and qualified groundwater hydrologist.
The groundwater recharge or discharge must demonstrate that
the development does not affect groundwater balances beyond
the property boundaries.
Not Applicable
Editor's Note— PSP6 Engineering Design Standards Roads,
drainage and earthworks provides guidance on prepare a
groundwater recharge and discharge plan.
Construction and establishment of stormwater management systems Table 9.4.8.3 Criteria for
assessment (part)
Performance Outcomes Acceptable Outcomes
Construction and establishment of stormwater management
systems
PO14 AO14.1
Construction methods provide for appropriate controls to avoid An erosion and sediment control plan prepared in accordance
entry and transport of litter, sediment, and associated with the International Erosion Control Association Best Practice
Books demonstrates that the capture and release of stormwater
prescribed water contaminants into receiving waters.
achieves the design objectives listed in Table A: Construction
phase – stormwater management design objectives of the State
Editor's note— Water contaminants are prescribed in the Planning Policy (Appendix 2).
Environmental Protection Act 1994. Able to Comply
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Performance Outcomes Acceptable Outcomes
Editor’s note— PSP6 Engineering Design Standards Roads,
drainage and earthworks provides guidance on requirements for
preparing an Erosion Management Plan.
AO14.2
Construction works are designed and managed to restrict the
extent of clearing and soil exposure to the minimum necessary for
access, and safe construction at any one time.
Able to Comply
AO14.3
For buildings:
(a) upstream runoff is diverted around the construction site;
(b) sediment barriers are provided downslope of disturbed
areas to prevent sediment washing into gutters, drains and
waterways , wetlands or drainage lines either on or off the
site; and
(c) temporary or permanent downpipes are connected to the
stormwater system before laying the roof; or
(d) localised erosion is avoided by directing flow from
downpipes over nonerosive areas.
Not Applicable
AO14.4
Chemical flocculants used as part of an erosion and sediment
control plan do not harm the environmental values within
receiving waters.
Not Applicable
AO14.5
Appropriately sized litter containment areas, with provision for
sorting recyclables are provided for the type of litter expected to be
generated onsite. Not Applicable
Wastewater management and effluent disposal Table 9.4.8.3 Criteria for assessment (part)
Performance Outcomes Acceptable Outcomes
Wastewater management and effluent disposal
PO15 AO15
Development does not discharge wastewater unless it can be Wastewater (nonsewage) generated from the development is
demonstrated to not compromise environmental values of collected and contained onsite, and is:
waters and water quality objectives. (a) lawfully disposed to sewer; or
(b) transferred offsite for treatment/disposal to an
Editor’s Note—Environmental values of waters and water appropriately licenced facility;
quality objectives are prescribed in Schedule 1 of the reused onsite in a closedcycle irrigation scheme,
(c)
Environmental Protection (Water) Policy 2009. industrial processes, washing or cleaning or other
purpose; or
(d) treated to meet the drinking water supply environmental
values prior to release.
Not Applicable
Editor’s Note—The Plumbing and Drainage Act 2003 sets out
requirements for wastewater management.
PO16 AO16
Onsite effluent treatment and disposal systems are designed, An onsite effluent system and disposal area is:
constructed and managed to not compromise the environmental (a) not located on a slope greater than 1 in (10%);
values of waters and water quality objectives.
(b) not located at or below the 1% annual exceedance
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Performance Outcomes Acceptable Outcomes
probability (AEP flood event);
(c) not located within a riparian buffer area mapped on a
Biodiversity, Waterways and Wetlands Overlay Map; and
(d) setback 400 metres minimum from the full supply level of
Lake Macdonald.
Not Applicable
Editor’s Note—The Plumbing and Drainage Act 2003 sets out
requirements for onsite effluent treatment and disposal. The
Queensland Plumbing and Wastewater Code and associated
guidelines are used to confirm the suitability of each site to
accommodate an onsite sewerage facility; or where a centrally
located group collection treatment system is proposed,
confirmation as to the suitability of the designated site to
accommodate the onsite sewerage facility. Additionally, where the
combined total peak design capacity of effluent treatment is less
than 21 equivalent persons, the design of the system achieves a
low to medium risk classification in accordance with Seqwater’s
Land Use Risk Tool for onsite sewerage facilities.
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