Pilbara's Water Crisis: A Looming Disaster Amid Record Heatwave
The Pilbara region in Western Australia is facing an unprecedented water crisis as a scorching heatwave persists, pushing temperatures towards 50 degrees Celsius. The Harding Dam, a critical water source for Karratha, has reached its lowest level since 1987, raising concerns about the city's water supply.
The dam's capacity, at 10.69 gigalitres or 16.8% full, is insufficient for the city's needs. When it drops below 18%, the water quality deteriorates, making it unsuitable for distribution. The region's reliance on tropical lows and cyclones for rainfall during the summer months has been disrupted by a dry season, exacerbating the water shortage.
The Millstream aquifer, a culturally significant site for the Yindjibarndi people, is the immediate alternative. However, both the dam and the aquifer depend on the same rainfall, creating a complex challenge. Water Corporation's regional manager, Sharon Broad, attributes the 80% drop in annual inflows over the past 30 years to hotter conditions and reduced rainfall.
As the situation worsens, an extreme heatwave warning has been issued for the Pilbara and Gascoyne regions, with temperatures forecast to soar close to 50C. In 2022, Onslow recorded Australia's highest maximum temperature of 50.7C, and the Bureau of Meteorology (BOM) forecaster Jessica Lingard warns that records may be broken.
The crisis has led to a noticeable impact on local businesses, such as Karratha nursery operator Natasha Selton, who has observed a decline in plant health due to the higher calcium levels in the Millstream water. She emphasizes the potential disruption to her business if water restrictions are imposed.
To address the long-term water crisis, the Western Australian government has partnered with Rio Tinto to plan a new desalination plant at Dampier. Adjunct Professor Bill Grace from the University of Western Australia's Australian Urban Design Research Centre argues that changes to the West Pilbara Water Scheme are necessary, suggesting that desalination plans should have been considered earlier due to the region's climate history.
