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Auburn Council uses Rocla CDS® Unit to Clean Up


Auburn Council recently installed a mid size CDS® Gross Pollutant Trap (GPT) to intercept the high volumes of stormwater pollution being transported from the Lidcombe area into Homebush Bay. The CDS® unit is now being cleaned - revealing just how much stormwater litter is generated and how effective it is at helping to reduce Lidcombe's environmental impact.

The stormwater channel which is adjacent to the Auburn Swimming Pool conveys high volumes of stormwater when it rains. Unfortunately, it also transports large amounts of debris as well, which all ends up in the Olympic wetlands, and the Harbour.

Auburn Council is addressing this environmental issue by adopting a best practice stormwater strategy, with the installation of a large sump CDS® unit in Church St, outside the swimming pool car park. This type of gross pollutant trap is known to be one of the most effective at trapping the widest range of stormwater pollutants from very high flows.

The upstream catchment that drains into this stormwater channel includes the Lidcombe Railway Station, the Catholic Club, and the surrounding shopping and commercial district. The catchment also drains a stretch of the Olympic Drive roadway, which has a very heavy traffic load every day. Therefore the stormwater that is conveyed from this area frequently produces large amounts of litter. As a result, it is no surprise to find that the CDS® unit installed by the Council has over 4 tonnes of pollution in it!

How it works

During a storm event, a whirlpool is created inside the CDS® unit to enhance the non-blocking screen design. Pollution is drawn towards the middle (away from the screens) where it can waterlog and sink into the storage sump below. Pollution that floats like PET bottles and polystyrene permanently floats on the surface of the CDS® unit until it is cleaned out. A vandal-proof concrete and steel lid hides the real benefit of the device, until Council is ready to show it off.

The CDS® unit is capable of capturing 95% of litter, which includes the floatable material mentioned above plus leaves, grass clippings, thousands of cigarette butts, newspapers, plastic bags, straws, syringes and large amounts of dirt and sediment. It will also capture most of the oil and silt that is washed off the roads and car parks.

Auburn Council Stormwater Manager George Stamatakos was able to get funding for the Trap as part of Council's "Stormwater Levy". Every house pays $25 per year towards helping to protect the environment. The Church St CDS® unit was installed 9 months ago and is doing its job well, but Council is not stopping there. As part of Auburn Council's overall water quality and flooding solutions - another similar Rocla stormwater management device is presently being installed to help protect Duck River along with multiple flood mitigation works.

Rocla Water Quality who assisted Auburn Council with the design and supply of the CDS® unit installation are proud to support Auburn Council's efforts to protect and improve our environment for future generations.

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