Stormwater treatment and infiltration combined
View the full project video here.
Frequent flooding from blocked, undersized pipes required major stormwater remediation of a carpark at Umina Beach, NSW. Constrained by the existing stormwater network, dunes, limited pavement slopes, and ocean outflow restrictions, Central Coast Council opted for an underground infiltration tank (ACO StormBrixx) with an upstream treatment device (HydroCon Pipes). Treating stormwater “at the source” was the only viable solution compared to traditional “end of pipe” designs.
System Design
- Stormwater is collected from the roadway and carpark through conventional kerb inlet pits, each connected by a pipe network.
- The collected water flows through the HydroCon pipes, where gross pollutants and other contaminants (oils, grease, sediment, particulate nutrients, dissolved phosphorus, and heavy metals) are filtered out and trapped within the HydroCon pipe system. The treated stormwater then exfiltrates through the permeable structure of the HydroCon pipes.
- The exfiltrated water flows through the gravel surrounding the HydroCon pipes and into the geotextile-wrapped ACO StormBrixx HD tanks for temporary storage.
- During a storm event, the water level in the tank rises, allowing excess water to be stored until it begins to drop after the storm. The stored stormwater then exfiltrates through the geotextile wrap, draining naturally into the earth and water table beneath.
