Prior to this step
You will have already accepted our Offer of Conditions, so you have an agreement with us to provide drainage services for the development. The next step is to obtain design certification.
To achieve the best outcome here, you will have submitted your flood and water quality models for review at the planning stage. If these models are not compliant, your detailed design acceptance might be delayed.
What you need to do
You must submit your detailed design to our Developer Project Works Team to receive final certification of your design.
Your design should include all necessary detail, such as:
instructions for the placement of reinforcement in concrete structures
size and placement of rocks
survey and level information, including appropriate flood level information
Need help with your design drawings?
We have a library of different drawings, including concept drawings, that are a good starting point.
Consider including wetlands, sediment ponds and bio-retention systems
Water quality can be managed at both a regional scale and at a local scale. Comprehensive analysis of water treatment systems suggests that cost savings can be achieved by treating stormwater at source, often referred to as Water Sensitive Urban Design (WSUD).
In addition to cost savings, 'at source' treatment can provide unique landscape settings and improve the understanding of the stormwater water cycle for local residents.
Consider integrating treatment measures into the development to reduce costs and create unique amenity values.
For more information on WSUD design and treatment see:
Ensure your design is compliant
For more information about the standards and specifications relating to the design of your asset:
We’ll review your initial design and provide feedback. We’ll also be available to answer any questions about your design.
Make sure the information you submit contains all the necessary detail, such as computations, HEC RAS, RORB, MUSIC model outputs (if applicable) and any technical or design reports that substantiate the proposal.
Rework and resubmit as needed
Our Developer Project Works Team will review your designs and provide feedback. We’ll be available to answer any questions about your design.
Give yourself plenty of time to achieve final acceptance of your design. Our Design of works page provides key lead times in the design process:
Finalise the design
Submit a Design Certification Statement once agreement is reached.
Keep a record of your Design Certification Statement and any plans you submit.
Avoid calling for tenders or arranging for construction of soft engineering projects until the design is accepted.
Begin to develop the maintenance agreement check whether the asset will be maintained by us or the local council.
Our Developer Project Works Team will support your development of this plan.