Western Corridor Recycled Water Scheme — Queensland's Drought-Built Reuse Network That Now Sits Mostly Idle (A Cautionary Case)

The Western Corridor Recycled Water Scheme (WCRWS) in South East Queensland, Australia, was built in response to the 2000s Millennium Drought as regional dam levels fell to around 17% in 2007. Construction began around 2005–2006; supply to Swanbank Power Station started August 2007 and to Tarong/Tarong North power stations in June 2008, with the project substantially complete by late 2008 (Wikipedia, citing Bureau of Meteorology and Seqwater data).

Three advanced water treatment plants (Bundamba, Gibson Island and Luggage Point), fed by six existing wastewater treatment works, used microfiltration, reverse osmosis, UV/advanced oxidation and chlorination, feeding a network of more than 200 km of pipeline. Design capacity is cited at 232 ML/day, with commissioned capacity reported elsewhere at around 180 ML/day. Between August 2007 and July 2010 the scheme supplied over 37,000 ML in total, primarily to the Swanbank and Tarong/Tarong North power stations, which initially consumed around 112 ML/day between them.

The scheme was also built with a pipeline to allow indirect potable reuse into Wivenhoe Dam if drought conditions worsened: in November 2008 the Queensland Premier set a trigger of dam storage falling below 40% before recycled water would enter Wivenhoe. Rains refilled the dams before that threshold was reached, so the potable-reuse link, though built and tested, was never operationally activated. Seqwater placed the scheme into "care and maintenance" mode in 2013, restarting a single process train at Luggage Point in 2018 for limited power-station supply; the current trigger for resuming fuller operation is combined South East Queensland storage falling below 60%.

Capital cost is most commonly cited at around AUD 2.5 billion (with a Queensland Government statement citing AUD 2.6 billion and ongoing costs of about AUD 150 million/year in interest repayments plus AUD 33 million/year in care-and-maintenance costs); the Australian Government contributed AUD 408 million via its Water Smart Australia Program. The Queensland Audit Office's "Report to Parliament 14, 2012-13: Maintenance of water infrastructure assets" examined the scheme and prompted a dedicated Queensland Parliament committee inquiry. An independent Australian Academy of Technological Sciences and Engineering (ATSE) report, "Drinking Water through Recycling" (October 2013), cited in the joint industry submission to that inquiry, found the scheme's original indirect-potable-reuse design — long-distance pumping to an elevated dam storage — "overly energy intensive... inefficient and economically unsustainable, particularly if used only for emergency or contingent circumstances," and recommended cheaper direct-potable-reuse alternatives instead. This practice is included as a documented cautionary case: substantial, independently-audited infrastructure that delivered real drought-contingency volumes for several years, but whose core design was independently assessed as economically unsustainable and which has sat largely idle, still accruing major fixed costs, for most of the past decade.

Read the full analysis: https://statements.qld.gov.au/statements/74426