Corindi Stormwater
Corindi Stormwater WETLAND
Stormwater treatment, biodiversity and ecosystem protection
A private development company needed a runoff treatment system that would avoid damage to a sensitive natural wetland downstream, and allow the residential subdivision to proceed. The low very low slope meant large constraints on the depth and design of the system.
Challenges
- Variable flows and water quality
- Colloidal clays
- Protection of sensitive ecosystem
- Community concern
Our role
- Design, construction supervision
- Community consultation
Outcomes
- Designated treatment systems
- Healthy system (birds and frogs)
- Residents use system as recreational amenity
- Clear water
Our Solution
The wetland was designed as a complex of treatment functions to address particulate and dissolved pollutants though the use of inlet zones, macrophytes, and gravel beds with trees, followed by open water zones. The use of gravel beds and dense plantings in macrophyte zones formed the core of the system.
The wetlands are in excellent condition as the subdivision proceeds to full occupation with housing. Large beds of several attractive plant species in mainly shallow water (public safety advantage) provide good treatment capacity as well as prime habitat for birds and frogs. Brolgas have been regular visitors. The water is clear, and residents use the wetland treatment system as a recreational asset by walking and observing the flora and fauna.