Edmondson Park Subdivision

01

The challenge

The site presented complex stormwater management challenges, including a constrained downstream discharge point and significant fall across the developable area. Council required the development to demonstrate no worsening of existing flood behaviour, while the client needed to protect the proposed lot yield and maintain project viability.

02

Our solution

Our team developed an integrated stormwater and flood management strategy that addressed the site's challenging topography, limited downstream discharge capacity and Council's no-worsening flood requirements. By integrating hydraulic engineering with the site layout and development objectives, we delivered a practical, compliant and cost-effective solution.

• Hydraulic and flood assessment to understand existing flood behaviour and identify key constraints across the site.
• Optimised site grading and drainage design to work with the significant natural fall while maximising the usable development area.
• Strategic stormwater detention and flow control to manage post-development flows and reduce impacts on the downstream drainage network.
• Carefully designed overland flow paths to safely convey major stormwater flows and maintain acceptable flood behaviour.
• Coordination with the development layout to protect the proposed lot yield without compromising stormwater and flood performance.
• Early consideration of Council requirements to develop a practical design that could be supported through the approval process.

03

The outcome

The integrated stormwater and flood management strategy successfully balanced Council's flood management requirements with the client's development objectives, and the final design was delivered within the agreed budget and timeframe.

• No worsening of flood behaviour, satisfying Council's key flood management requirements.
• Protection of the proposed lot yield, maximising the development potential of the site.
• Effective management of stormwater runoff despite the constrained downstream discharge point.
• Safe and practical overland flow paths that addressed major stormwater events.
• A cost-effective and buildable drainage solution without unnecessary impacts on the development layout.
• Delivery within the agreed budget and timeframe, supporting a smoother development approval and project delivery process.