Completed in 1895 the Wolli Creek Aqueduct stands as a testament to engineering prowess. It’s a vital part of Sydney’s history. This impressive structure carries three large pipes across Wolli Creek. They transport sewage from the western suburbs. The aqueduct’s design is a marvel. It boasts a combination of brick arches and steel bridges. The white glazed face bricks are particularly striking. They are laid in English bond with decorative red brick motifs. The sandstone springing points and cornices add an extra touch of elegance.
The aqueduct was built by the NSW Public Works Department. Robert Hickson was the engineer-in-chief at the time. He also happened to be a foundation member of Sydney Water. The original design called for three 1.8-meter diameter wrought iron pipes. Only two were initially laid. A third pipe made of welded mild steel was added in 1929. This demonstrates advancements in technology over time. The pipes are carried on 170 meters of segmental brick arches. These arches have a span of approximately 9.8 meters each. There are also two steel lattice girder bridge spans. They are 24 meters long and 7.6 meters wide. Additional mass concrete arches support the embankment sections.
The total length of the Wolli Creek Aqueduct is approximately 220 meters. The steel bridges are of mild steel riveted construction. They rest on metal circular piers. The brick arch piers are made from mass concrete. They’re faced with decorative brick and dressed sandstone. The foundations are built on timber piles. The aqueduct required extensive tunnelling. It was part of a larger project. This project was the Western Main Sewer later renamed the Western Suburbs Ocean Outfall Sewer. This sewer served the western suburbs of Sydney.
The pipes have been maintained throughout the years. Defective sections have been replaced as needed. Between 1981 and 1984 the pipes underwent an overhaul. Their surfaces were coated with a fiberglass lining. The steelwork on the bridges has also been replaced where necessary. Fencing was installed to prevent trespass. The Wolli Creek Aqueduct is one of six sewage aqueducts in Sydney built between 1895 and 1901. Its unique blend of materials and construction techniques makes it truly remarkable. It’s a significant piece of Sydney’s engineering heritage. The Wolli Creek Aqueduct is more than just pipes and arches. It reflects the ingenuity and ambition of a bygone era. It continues to serve its purpose quietly and efficiently.