The Murray-Darling Basin Authority has issued a primer on the importance of protecting the Coorong, Lower Lakes and Murray Mouth, largely based on the assertion that the Environment Protection and Biodiversity Conservation Act 1999 and the Ramsar Convention would be threatened if action was ignored.
The article reconstructs the history of the introduction of the barrages from 1931-45, and maintains there isn’t enough freshwater coming down from the upper Basin to stop seawater naturally entering the lakes.
“A key priority is ensuring the freshwater environments of the site are protected from further seawater intrusions. While river levels remain low, the barrages continue to prevent seawater from destroying the region’s ecological character as a wetland of international importance.” More at the link below.
David Boyd's Blog 