Improving Stormwater Management with a New Rainwater Harvesting System
Our team attended a property in Lilli Pilli to install a new rainwater harvesting and stormwater drainage system, helping capture roof water, reduce stormwater runoff, and improve water management across the property.
The project involved replacing existing downpipes, installing new underground stormwater drainage, connecting a 4,000L rainwater tank, and constructing an absorption trench system to safely manage overflow during heavy rainfall events.
Why Stormwater Management Matters
Every roof collects a significant volume of water during rainfall. Without a properly designed drainage system, that water can contribute to pooling, erosion, saturated garden areas, and unnecessary pressure on the property's stormwater infrastructure.
For this project, the goal was not simply to install a rainwater tank. The objective was to create a complete system that could collect, store, and manage roof water efficiently while providing a safe overflow solution when the tank reached capacity.
New Downpipes and Stormwater Drainage
Five new PVC downpipes were installed to improve roof water collection and direct rainfall into the new drainage network.
Approximately 57 metres of new 100mm stormwater pipework was then installed throughout the property, connecting the roof drainage system to the new rainwater tank and overflow infrastructure.
By upgrading both the collection and transfer components of the system, roof water can now be managed more effectively during both everyday rainfall and larger storm events.
4,000L Rainwater Tank Installation
A new 4,000L Colorbond rainwater tank was installed to capture and store water collected from the roof.
The system included a first flush diverter, leaf strainer, drain valve, and overflow pipework to improve water quality and ensure reliable long-term operation.
Rainwater harvesting systems provide homeowners with a practical way to collect and reuse water that would otherwise be lost to the stormwater network.
Absorption Trench Overflow System
A large absorption trench was constructed within the rear yard to manage excess water once the tank reaches capacity.
The trench was wrapped in geotextile fabric and backfilled with blue metal aggregate, creating a highly effective underground dispersal area for stormwater overflow.
Rather than allowing excess water to pool on the surface, the absorption trench helps slowly distribute water back into the surrounding ground, reducing runoff and improving overall drainage performance.
A Complete Water Management Solution
This project combined rainwater harvesting, stormwater drainage, overflow management, and groundwater dispersal into a single integrated system.
By collecting roof water, storing it for future use, and safely managing overflow during heavy rainfall, the property now benefits from improved stormwater performance and a more sustainable approach to water management.
