Landscape Architect & Specifier News

MAR 2017

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

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Page 77 of 165

78 Landscape Architect and Specifier News Continued on page 80 Wetland Continued from page 76 The project had three key objectives: Water Management: Effectively harvest urban wastewater, improve water quality and reduce potable water consumption. Landscape and Habitat: Strengthen the visual and functional connections between the park's water bodies; improve the landscape setting, recreational opportunities, environmental amenities and habitat value. Interpretation: Uncover and express the park's water story through design and artful influences within the landscape, including immersive opportunities for interactive play and education. The Outcome Much has been achieved over the past two decades in transforming the Sydney Park site from its industrial and landfill legacy into 44 hectares of parkland that are a vital asset for the growing communities of south- east Sydney. Above & Top, Left: Children traverse the bioretention wetlands on stepping-stones. Editor's note: Can't help imagining the little girl just about to touch down will slip and fall back, smacking her head on the stone from whence she hopped. ABOVE PHOTO: PHOTO: SARA REILLY; TOP,LEFT PHOTO: ADAM HUNTER The Sydney Park water re-use project is Sydney's largest environmental project to date. The project now provides enhanced circulation of water through a chain of ponds and wetlands; improving water quality, visual amenity and detention storage effectiveness. The water scheme diverts on average each year 840 megaliters (221 million gallons) of stormwater for treatment and reuse. The treatment train includes a gross pollutant trap, 5,000 square meters of bioretention system, wetlands and the existing ponds. Previously, all stormwater from the 200-hectare (494 acres) upstream catchment flowed through to Munni Channel, and into Alexandra Canal and Botany Bay untreated. (Historical note: On April 29, 1770, Captain James Cook and his HMS Endeavour crew made their first Australian landfall at what they dubbed "Botany Bay." The bay is about 8 miles south of the Sydney business district.) The ponds at Sydney Park suffered poor water quality and outbreaks of blue-green algae and Azolla. Azolla (aks mosquito or duckweed fern, and fairy moss) is a pernicious genus (Salviniaceae) of aquatic ferns that can stagnate waterways in periods of low rainfall and during the warmer months.

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