1 A number of small catchments in South Australia, of which the largest are the Angas River flowing through Strathalbyn and the Finniss River further west, are part of the MurrayâDarling Basin.otal water flow in the MurrayâDarling basin 1885 to the present has averaged around 24,000 gigalitres (24 km3; 19,000,000 acreÂ·ft) per year. This is the lowest rate of the world's major river systems.
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