Water pollution is a growing crisis around the world, but one city in Australia is doing its part to tackle the huge surges of waste that come from stormwater drains. By using a somewhat obvious, simple and cost-effective system of nets, or “trash traps,” the City of Kwinana is moving to prevent waste from entering its waters.

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In Spring 2018, the City of Kwinana collaborated with supplier Ecosol to install two drainage nets in the Henley Reserve. The netting was simply attached to concrete drain pipes, and these nets have since collected 370 kg (about 816 lb) of waste, including plastic food wrappers and bottles.

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The system, including manufacturing, installation and additional labor, cost the municipality about $20,000 — prior to the nets, city workers would collect debris in the water by hand. The new system is picked up and cleaned out using cranes when the nets become full of waste. Then, the waste is sorted in a designated facility. Here, green waste is transformed into mulch, and other materials are separated into recyclable/non-recyclable.

The City of Kwinana has considered the drainage nets a huge success, with plans to install three more nets in the nature reserve area over the next two years.

“We know that the Kwinana community is very passionate about environmental initiatives and rallies around actions with positive environmental impact, and if it was not for the drainage nets, 370 kg of debris would have ended up in our reserve,” Mayor Carol Adams said. “The nets are placed on the outlet of two drainage pipes, which are located between residential areas and natural areas … This ensures that the habitat of the local wildlife is protected and minimizes the risk of wildlife being caught in the nets. To date, no wildlife has been caught up in either of the City’s nets.”

The system took off on social media, in a viral storm that Adams said shows the importance for all levels of government to focus on initiatives to save the environment.

+ City of Kwinana

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