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The project is a component of Sustainable Sydney 2030, harvesting stormwater from the Newtown catchment at the measure of 850 million litres/year. Water is captured, made good and returned viable through a dynamic, new waterscape; at all times connecting park users to the water narrative of capture, movement and cleansing.

Prior to the project all stormwater flowing through the Munni Channel from the 200 hectare upstream catchment to the north flowed to Alexandra Canal and beyond to Botany Bay untreated. The project now pumps up to 1000L/s of stormwater from Munni Channel into the Sydney Park water re-use scheme. This diverts an average of 840 ML/yr of stormwater for treatment and reuse.

Water is diverted from the Munni Channel and pumped via a gross pollutant trap up to 200 metres to a series of bioretention beds covering approximately 5000m2 in total.  The biorention beds flank 3 major wetland water bodies to which the filtered water ultimately drains.  Water is reticulated between the lower and upper wetlands and is aerated through a series of cascades between the wetlands.  In addition to their water quality function the cascades provide cool lush environments enjoyed by park users.

30 million litres a year of harvested water is now recycled for improved circulation of the ponds, irrigation of the Alan Davidson oval and the Village Green, and non-potable water supply for the nursery and truck washing at the City of Sydney Depot. The scheme is also intended to ultimately service additional uses beyond Sydney Park.  These include nearby industrial sites such as concrete batching plants, metal recyclers, industrial laundry facilities, and textile manufacturers, as well as future urban redevelopment projects such as Ashmore Precinct and Alexandra Canal.  Water re-used for irrigation or in the long industrial uses is further treated by filtration and UV disinfection.

The project is multi-dimensional with all elements serving more than one purpose. Each has been carefully orchestrated to contribute to the collective “sum of its parts”, and support the environmental processes at the heart of the brief.

Highlighting these processes was an important part of the project. Turpin + Crawford’s ‘Water Falls’ celebrates the passage of water from the end of the water treatment “train” back into the system at the upper “Wirrambi Wetland”, while supplementing “the cascades” in providing critical aeration of the stored waters.  The project enables the community to understand that environment and urban recreation are not mutually exclusive and can be integrated in a way that adds value to the experience of each.  It shows that a melding of contemporary design and science though a collaborative forum can achieve hybrid outcomes that challenge our professional boundaries.

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