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Hi Alex,
I think you will find the people in Hong Kong copied the idea from those in Holland. The sea wall in Holland is many times bigger and seperates the sea water from the fresh water which is then used for irrigation (and fencing, of a sort and so on). Also note in Holland they too pump out the excess water....
Essentially this is not a new idea. Would it work in Sydney, well probably, but building a recycling plant is far simpler, far more effective, and doesnt destroy the local ecosystem...
Cheers
Michael
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