The immediate purpose of the Canals which I am talking about is for alleviating the problems of Flood and Drought.
The byproduct of these Canals are many...
By creating a spiderweb, just to name a design, of giant Canals acrosss the Continent, where smaller minor Canals run off and into - you create a watery availabilty to the environment.
Like I said: If a Canal ran its way through the Simpson Desert - there would be a degree of temperature change and humidity as water passed back and forth (depending on where it was needed) and sometimes remained stationary. During the day there would be evaporation - but this evaporation would be in the immediate atmosphere, which 'could' occassionally result in light rain for want of none at all come the afternoon. During the night, the cool moisture of the water would drift across the immediate land - resulting in dew, a form of watering the garden ...night after night.
Animals of all kinds would be able to 'drink' and participate via these water Canals in greater proliferation than just the odd Lake Eyre moment.
People would have more availabilty to water and usage.
By the availability of such water, more TREES can be grown and supported - resulting in cooler temps, shade for better soil (because worms aren't burnt out of existence from an ever present sun beating down upon the soil), more 02 for an ever dwindling atmosphere, higher probability for decent rains.
The compartmental of land by the Canals running this way and that, would result in a large number of Bridges being built (but I'm sure us Australians are cool with that considering the Sydney Harbour Bridge for starters) - and Pest Species being easily erradicated or controlled due to isolation techniques with the help of such compartmentality of the land by Canal bounderies.
Bushfires might be better contained in areas where a Canal blocks further progression.
During Sydney's 'Water Shortage' years - When the rains did evetually hit, only 18 inches would fall into Warragamba Dam (a few metres worth was Algae plagued) but a whopping 20 metres worth would fall upon Sydney streets, down stormwater drains and out to sea.
In person, a lot of Sydney Water Employees would tell me "A complete 'effin Waste!!"
The World looks to Australia for Water wisdom and expertise and it might be our best asset as surely as the Americans are the best at Flight and Space.
The advantages are endless and I'm sure there is much more than I know.
But if you think such a system is just for Euro-Venetian Gondolas ...I'm sure the Canals can accommodate your sense of Romance as I'm sure they would lend much to such novel experiences in the future.
"Row row row ya boat, gently down the stream (canal). Merrily merrily - life is but a 'dream'."