6. Improve overflows
Sydney’s sewer system is over 100 years old, and built for a smaller city. So, when it rains, stormwater can flow into the sewer system, causing it to overflow into our creeks and rivers. Understanding where, when and how this happens and putting measures in place to stop it are an essential part of making our river swimmable again.
Improve water quality outcomes through targeted wet weather overflow management, focused on those overflows impacting existing and proposed swimming sites.
NSW Environment Protection Authority and Sydney Water.
Overflows in the Parramatta River catchment meet all EPA licencing conditions.
Sydney Water is working closely with the EPA to prioritise wet weather overflow abatement works in the Parramatta River catchment. Planned works are prioritised following a risk-based approach that considers multiple factors such as the frequency and volumes of Wet Weather Overflow discharges, the sensitivity value and use of the receiving environment and the cumulative impacts of multiple discharges.
The current priority is the Upper Parramatta Stage 1, which is a Source Control project. The assets are mainly Emergency Relief Structures (to manage and avoid heavy wet weather overflows discharging into customer properties or public areas). The design and delivery solutions included repairs of existing relief structures and new constructions, including concrete chambers, headwalls, pipes, duckbill valves, and in-line check valves.
|March – June 2020
|January – March 2020
|October – December 2019
| July – September 2019