Damming the Aberfeldy River is obviously an option that has to be considered for improving Melbourne's water supply. Regarding environmental flows, dams can allow better outcomes than totally natural conditions. They can act as a buffer against damaging flood peaks. Timing and amounts of flow can sometimes adjusted to serve the environment better than some rain events. Especially allowing increased flows in droughts.
Apparently only a relatively short tunnel would be required to allow water from the Aberfeldy River to supplement the Thomson system.
In normal seasons the percentage of river flow held back in a dam need not necessarily be high. However, major flood events, as has occurred recently in Gippsland can save a lot of water that would run to waste, often causing damage in the process. This water can then allow increased supply during drier periods.
Human needs for water have to be balanced against those for the environment. Unfortunately Labor Party policy on it seems to be designed to catch so called "green" votes in the city rather than responsible environmental management. Look at the idiotic costly and environmentally disasterous schemes thay are pursuing! With the pipe taking water from the Goulburn River to Melbourne, when Melbourne storages are low, usually there is a more severe shortage north of the dividing range. See www.plugthepipe.com.
It is also morally despicable implementing a "quick fix solutions for Melbourne's water shortage by taking water that rightfully belongs to communities and the environment in the Murray Darling Basin.
A desalination plant as the Victorian State Govt is proposing at Wonthaggi will be very expensive to build. Also very costly to run for the water produced by it and the environmental resources required and damage done. Would be far better and cheaper to further clean up and reuse a similar amount of water from Melbourne that goes through the south east treatment plant and is then piped to the ocean rather than getting salt and other impurities out of sea water.
The Liberal Party as the possible Government after the next election has to carefully consider options for improving water supplies. This includes possible new dams on the Gellibrand River in the Otways, the Mitchell in East Gippsland, the Buffalo River in North East Victoria and probably others as well as one on the Aberfeldy River.
Mick



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