Aura and Harmony water & sewerage project

The project involved complex water and sewer infrastructure, including new water supply pipelines, reservoirs, a large sewage pump station, rising mains and connection to the Kawana Sewage Treatment Plant. A key technical challenge was managing site-specific interconnections between the proposed new pump station and an existing operational pump station.

The multiple new sewer rising main connections required a carefully planned temporary bypass arrangement to maintain uninterrupted sewage flows during construction. Designing this bypass presented technical and operational risks, including maintaining service continuity, minimising public impact and controlling construction cost.

The temporary works solution needed to be practical, constructible and aligned with Unitywater requirements while supporting tender competitiveness.

Phronis provided early-stage engineering advisory input to support tender development, working closely with Seymour Whyte and engaging in technical liaison with AECOM on design aspects.

We contributed to concept design development for water supply and sewerage infrastructure, with particular focus on the temporary sewer bypass required for new rising main connections. An innovative bypass configuration was developed to maintain sewage flows during construction while reducing complexity and potential disruption.

The proposed solution significantly reduced the bypass pipeline length by approximately 1.1km, improving constructability and lowering cost exposure. Our structured advisory input supported integration of temporary and permanent works within the overall infrastructure concept.

The project successfully delivered engineering advisory support for water supply and sewerage components during tender development. The concept design for the temporary sewer bypass provided a practical pathway for maintaining continuous sewage flows while enabling construction of new pump station and rising main infrastructure.

The innovative bypass arrangement reduced potential public impact and lowered construction cost by shortening the required temporary pipeline length by approximately 1.1km. This strengthened the technical and commercial position of the tender submission.

Through early coordination and targeted technical input, Phronis supported development of a robust infrastructure solution aligned with Unitywater requirements and operational continuity objectives.

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