Abstract
The city of Maryborough in Queensland, Australia, is supplied with treated water from the 8.6m maximum depth, 3.5 mill m3 capacity, Teddington weir - a long sinuous storage formed by damming a 15km length of Tinana Creek. Thermal stratification in this semi-tropical storage produced problems at the water treatment plant due to manganese release from the bottom sediments under low oxygen conditions leading to high and fluctuating levels of manganese in the raw water. Automatic aeration, controlled by temperature sensors, was installed in the storage in January 1996 to maintain continuous unstratified well oxygenated conditions in the storage. The result has been a significant general reduction in manganese and its variability in the raw water.
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