South West Priority Land Release Area (SWPLRA) – Water Infrastructure

Sydney Water

Sydney, New South Wales, Australia

Diona undertook development and finalisation of the pipeline concept design plus construction of almost 9.5km of potable water pipelines to support rezoning and development in the South West Priority Land Release Area (SWPLA) and Western Sydney Priority Growth Area (WSPGA).

The SWPLRA and WSPGA, formerly known collectively as the South West Growth Centre, encompasses 18 precincts and covers approximately 17,000ha, with potential capacity for around 200,000 new dwellings. The area had previously been zoned predominantly for rural residential, agricultural and horticultural land uses; however, to cater for Sydney’s growing population, the Government intends to alter land use in parts of this area to higher density residential development and employment lands.

To support the land use changes, Sydney Water’s objective is to deliver the potable trunk water mains and booster water pumping stations by 2020, so that anticipated growth in the SWPLRA SRPs can be serviced in a timely manner.

Our team provided true turn-key design and construct, with design completed by our sister company Calibre and construction by Diona. Services included all plant, labour and material supply, design, service location, valve testing and shut down works, community notification and engagement, restoration works and development of as built information. Our history of large volume of works in the Leppington and Austral areas provided a significant advantage in accelerating the design and construction of this project.

The pipeline network consisted of potable water pipes ranging in diameter from DN200 up to and including DN560; pipe materials include ‘DICL’, ‘HDPE’ & ‘SCL’. Construction was undertaken mainly by conventional open cut trenching, however, trenchless construction techniques were adopted in numerous areas, such as the locations of major roads and utility crossings, the crossing under the heritage ‘upper canal’ , and the Eastern Gas Pipelines. The pipeline alignment also takes route through a current Transgrid easement and areas of Western Sydney Parkland Trust property.