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When Ngurunderi walked across the Murray’s mouth : Comments
By Jennifer Marohasy, published 7/2/2014Ancient aboriginal Dreamtime myths seem to attest to the fact that the Murray River did not necessarily flow out to the Great Southern Ocean.
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Consider the evaporation rate from Lake Alexandrina, Lake Albert, The Coorong and Goolwa Channel, all of which amounts to a very sizeable open water area at the mouth of Australia’s largest river. Consider also the movement of water into the groundwater system and the very extensive swamps around these lakes and then evapotranspirated through a very large expanse of natural vegetation.
The flow down the Murray in dry times in pre-European occupation could easily have amounted to less than this output, thus allowing a sandbar to form across the mouth.
It comes as no surprise at all to me that a sandbar could have formed in dry times, long before the flow was reduced by the diversion of waters into irrigation areas.