Capelli Road Wastewater Pump Station Upgrade
Innovative approach led to time and cost savings


The Capelli Road Wastewater Pump Station is major pump station in Adelaide’s north-western suburbs. It receives flow from nine smaller pump stations and services a population of around 40,000. It discharges wastewater to the Bolivar trunk main, approximately 1.2 km east of the site.

The original Capelli Road wastewater pump station had sustained extensive hydrogen sulphide damage rendering the wet well and building structurally unsound. This project involved complete replacement with new structures and mechanical elements, designed to allow continued operation of the existing pump station during construction and commissioning.


The new pump station wet well is 9 m deep and 6 m in diameter. The design flow rate of the new pump station is 450 L/s using a three pump duty, assist, standby arrangement. Hydraulic design required maintaining relatively low pumping head in order to protect the original rising main system. Site levels and earthworks were designed to minimise the volume of spoil removed from site.

The scope included:

  • construction of new pump station
  • demolition & decommissioning of existing pump station
  • secant pile HDPE lined wet well and mechanical fit out
  • valve chamber with mechanical fit out
  • new switchboard and SCADA/PLC building
  • electrical and SCADA connections
  • Installation of odour control system
  • new inlet pipework and man holes
  • discharge riser pipework and connection to rising main
  • stormwater works
  • pavement and asphalt works
  • landscaping works


Leed worked closely with its nominated designer Tonkin Consulting and SA Water throughout the detailed design phase to provide SA Water with a solution that met the specified requirements while incorporating new techniques and efficiencies.

The original concept design for the pump station included the use of secant piling for the wet well shaft. During the tender process, Leed and Tonkin Consulting identified an alternative method that involved using a segmental shaft caisson structure. This method provided significant cost benefits for the project by reducing the amount of concrete required and shortening the time to install the shaft by using precast segments.


Institute of Public Works Engineering Australasia (IPWEA)

2015 Award for Excellence in Design and/or Construction of a Public Works Project—Water Project > $ 1 million (with Tonkin Consulting Pty Ltd)

Australian Water Association

2015 SA Infrastructure Project Innovation Award (with Tonkin Consulting)

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