The Bradfield Scheme

The Bradfield scheme was to create an inland sea in Australia by filling up like air and diverting rivers to it. The idea was that this would basically drought-proof much of Queensland and South Australia, except that it would be salt water. I'm not actually familiar with the details of how they were going to get around that particular problem. But regardless of the merits of that particular scheme, what, um, what incredibly ambitious project are we not building currently?