Council is working together with the Cooks River Alliance to undertake environmental improvement works at Butler Reserve, Kingsgrove. The work will include the construction of a raingarden and nature playground as part of the project supported by the Cooks River Alliance through funding from the Australian Government and Georges River Council.
Alluvium Consulting have developed detailed designs for the raingarden and nature playground and construction is currently underway and due to be completed by the end of 2016.
In an innovative design solution, soil that is excavated for the construction of the raingarden will be re-used on site and will form the basis of the new nature playground. Spread over three small mounded areas the playground has been designed to incorporate many natural elements into the space including sandstone rocks and timber logs.
In March 2016, Council officers held a community engagement session at Butler Reserve to explain the raingarden and playground and to seek community feedback on the designs.
The raingarden will:
- Filter stormwater before it drains to Wolli Creek and the Cooks River
- Create a more permeable surface to allow water to soak into the ground and reduce runoff
- Increase the amount of greening for habitat and biodiversity in the area
- Create an improved look and feel for Butler Reserve
A second generation raingarden and vegetated swale system was constructed in December 2010 at Bundara Reserve, Beverly Hills.
Based on Water Sensitive Urban Design (WSUD) principles, the raingarden and swale system captures and treats stormwater which flows from the adjoining urban catchment before it enters the Cooks River catchment. The vegetated swales act as a filter to remove sediment and gross pollutants (including plastics, bottles and wrappers) before water flows into the raingarden. Once the water reaches the raingarden, it filters through a series of layered media (soil, sand, woodchips, and recycled crushed glass). Together with the plants’ root system, the layered media treats the flows to remove nitrogen, phosphorus, sediment, grease and oils before it enters the headwaters of Wolli Creek.
As a second generation raingarden, it also includes a ‘wet’ section beneath the surface to increase nitrogen removal.
It is estimated that 100% of gross pollutants, 85% of sediments, 70% of phosphorus and 45% of nitrogen will be removed from the sub-catchments stormwater flows once treated by this system.
This project was partially funded by the Sydney Metropolitan Catchment Management Authority (SMCMA), the Botany Bay Water Quality Improvement Program (BBWQIP), the Cooks River Sustainability Initiative (CRSI) and the Waste and Sustainability Improvement Payments (WaSIP) program.