What's the really big issue- pollution or depth

One thing is clear , while pollution is a contributor , the main problem for improving water quality in lake Colac is the depth .
The major problem with a body of relatively fresh water big enough to easily supply the household population of Melbourne for a year ( even half empty) is that, its too big to deepen all over and its too shallow to prevent eutrophication. Getting enough depth over the base to reduce the eutrophic and wave effects is not possible on a lake of this age, without changing its whole character - its not a purrumbeet. Geologically its ready to becomeone big swamp

CONCLUSION My view of the limits
The best that we can hope for is to change part of the lake .To turn Lake colac into lakes,lakes colac
Hence the idea above - Titled Lakes Colac

what do you think ? hopefully commonly asked questions about practicality will be raised shortly . Some already have ( see links ) The discussion is limited ( mainly for space purposes) to practical options to change lake colac without overty changing its character. This blog is not intended to explaincmplex challenges in each proposal but to list the proposals, new questions and answers as they arise.