Australian Broadcasting Corporation: The head of Melbourne Water says there is still uncertainty about the city’s drinking water despite a $4.9m plan to secure long-term supplies. The desalination plant at Wonthaggi and the north-south pipeline are being built to secure the city’s water supply for the next 50 years. But the Melbourne Water Chairwoman, Cheryl Batagol, says there are doubts about whether it will be enough. “There are always degrees of uncertainty and further climate change impacts and …