I'm not too sure IF we will ever see Mt Druit 'snowbound'......But.....Ya never never know....Like...Dr Tim Flannery said 'It ain't gunna rain NO MORE', so the NSW Gummint built a 'desal' plant at a cost of 'squillions'....
To build and maintain....
Anyhow, from Google Earth, the elevation of the Badgerys Creek site (To the SE of Luddenham) seems to be in the order of 200ft - 300ft...depending just WHERE the rwys are going to be....Well above the 'raging Hawkesbury' i would think.