The Murray–Darling Basin is the largest and most complex river system in Australia. It runs from Queensland, through New South Wales and the Australian Capital Territory, Victoria and South Australia, spanning 77,000 kilometres of rivers, many of which are connected.
Towns and rural communities across the Basin rely on a healthy river system—our economy, food security and well being depend on it, now and into the future.
https://www.mdba.gov.au/discover-basin
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CRIKEY !#&@ ...... IT'S THE WEATHER CYCLES 
A prolonged spell of drier-than-usual weather has seen some areas of eastern Australia fall more than one metre behind their usual rainfall totals during the last three years. For some places, this dry spell has been their worst on record.
https://www.weatherzone.com.au/news/unprecedented-three-year-drought-rolls-into-spring/530194
Image: Rainfall anomilies in and around the Murray Darling Basin during the three years ending in August 2019. Source: Bureau of Meteorology
Image: Rainfall anomilies in and around the Murray Darling Basin during the three years ending in August 2019. Source: Bureau of Meteorology